CN120498552B

CN120498552B - Optical communication system, method and related device

Info

Publication number: CN120498552B
Application number: CN202510989885.0A
Authority: CN
Inventors: 高士民; 叶尧; 谭健思; 高峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2025-07-17
Filing date: 2025-07-17
Publication date: 2025-10-28
Anticipated expiration: 2045-07-17
Also published as: CN120498552A

Abstract

The present application discloses an optical communication system, method and related devices, which belong to the field of communication technology. Among them, the central optical module includes a fixed wavelength laser for generating multiple optical signals of fixed wavelengths; the central optical module is used to send a composite downlink optical signal to multiple access side optical modules, and the composite downlink optical signal includes multiple downlink optical signals of different downlink wavelengths generated by the fixed wavelength laser, and different downlink wavelengths correspond to different access side optical modules; each access side optical module includes an adjustable wavelength laser, and the adjustable wavelength laser is used to send an optical signal of the uplink wavelength corresponding to the access side optical module to the central optical module, and different access side optical modules correspond to different uplink wavelengths; the central optical module is also used to receive a composite uplink optical signal, and the composite uplink optical signal includes multiple uplink optical signals of different uplink wavelengths. The present application can apply normalized access side optical modules, reduce the difficulty of production and deployment of access side optical modules, and reduce the difficulty of networking.

Description

Optical communication system, method and related device

Technical Field

The present application relates to the field of communications technologies, and in particular, to an optical communications system, a method, and a related device.

Background

Optical communication refers to the transmission of optical signals carrying information over optical fibers. To ensure the quality of optical communications, the optical fiber may be pulled directly into the user's room, thereby enabling the optical fiber to be taken home. In one scenario of fiber entry, the fiber is pulled into rooms at various floors within the campus, and upstream and downstream information between access devices in the rooms and a central switch within the campus is transmitted through the fiber.

The access device is typically connected to the central switch through an intermediary device. A central switch is capable of optical communication with a plurality of access devices through intermediate devices. As an example, 8 access devices are a group, and a group of access devices is connected to the same intermediate device through an optical fiber, and the intermediate device is connected to the central switch through an optical fiber, so as to implement optical communication between the group of access devices and the central switch. A central switch may connect one or more groups of access devices through one or more intermediate devices.

Wherein each access device is plugged (or integrated) with an optical module, and the central switch is also plugged (or integrated) with an optical module. The optical module is used for generating and processing optical signals, and is one of bridges for realizing optical communication between the access equipment and the central switch. For ease of distinction, the optical module plugged into or integrated with the access device may be referred to as an access side optical module and the optical module plugged into or integrated with the central switch may be referred to as a central optical module. Currently, a wavelength division multiplexing scheme may be used to implement optical communications between multiple access-side optical modules and a central optical module. That is, different access side light modules on a group of access devices correspond to different uplink and downlink wavelengths, and uplink and downlink information corresponding to each of the uplink and downlink wavelengths is transmitted by using optical signals corresponding to each of the plurality of access side light modules. In the wavelength division multiplexing scheme, the wavelength division interval is one of factors influencing the reliability of optical communication and the networking difficulty, and the proper wavelength division interval is beneficial to guaranteeing the reliability of optical communication and reducing the networking difficulty.

Disclosure of Invention

The application provides an optical communication system, an optical communication method and a related device, which can apply a normalized access side light module in a park scene, thereby simplifying the production difficulty and the deployment difficulty of the access side light module. Further, the implementation cost of normalization of the access side light module is reduced. The technical scheme is as follows:

In a first aspect, an optical communication system is provided, including a central optical module and a plurality of access side optical modules, where the plurality of access side optical modules correspond to a plurality of uplink wavelengths, and the plurality of access side optical modules correspond to a plurality of downlink wavelengths, where downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, where uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, where the central optical module is connected to the plurality of access side optical modules, where the central optical module includes a fixed wavelength laser, where the fixed wavelength laser is used to generate optical signals with a plurality of fixed wavelengths, where the plurality of fixed wavelengths includes the plurality of downlink wavelengths, and where each access side optical module in the plurality of access side optical modules includes an adjustable wavelength laser (also referred to as a wavelength adjustable laser);

the central optical module is used for sending a composite downlink optical signal to the plurality of access side optical modules, the composite downlink optical signal comprises a plurality of downlink optical signals generated by the fixed wavelength laser, and the wavelengths of the plurality of downlink optical signals are respectively the plurality of downlink wavelengths;

each access side light module in the plurality of access side light modules is used for transmitting an optical signal of an uplink wavelength corresponding to the access side light module to the central optical module by using the wavelength-adjustable laser;

the central optical module is further configured to receive a composite uplink optical signal, where the composite uplink optical signal includes a plurality of uplink optical signals, and wavelengths of the plurality of uplink optical signals are respectively the plurality of uplink wavelengths.

The application has the advantages that the cost is low, the central light module adopts the fixed wavelength laser, the access side light module adopts the adjustable wavelength laser, so that the plurality of the access side light modules can normalize, and in the optical communication process, the adjustable wavelength laser of each access side light module can emit light signals according to the uplink wavelength corresponding to the access side light module. The normalized access side light module is applied, so that the production difficulty and the deployment difficulty of the access side light module are reduced.

In one possible implementation, the wavelength division interval of the plurality of downstream wavelengths is greater than the wavelength division interval of the plurality of upstream wavelengths. That is, the present application may employ a hybrid wavelength division scheme, thereby compromising cost and production/deployment difficulty.

In one possible implementation, the plurality of downlink optical signals included in the composite downlink optical signal are transmitted based on a coarse wavelength division multiplexing (coarse wave division multiplexing, CWDM) mode, and the plurality of uplink optical signals included in the composite uplink optical signal are transmitted based on a dense wavelength division multiplexing (DENSE WAVE division multiplexing, DWDM) mode. That is, the present application may employ a wavelength division multiplexing scheme in which coarse and dense wavelength division are mixed.

In one possible implementation, the wavelength division intervals of the plurality of downlink wavelengths are greater than or equal to a first threshold, the wavelength division intervals of the plurality of uplink wavelengths are less than a second threshold, and the first threshold is greater than or equal to the second threshold.

In one possible implementation, the first threshold is 20 nanometers (nm) and the second threshold is 2.5nm. The smaller second threshold may reduce implementation costs of access side module normalization.

As an example, the wavelength division interval of the plurality of downstream wavelengths is 20nm, and the wavelength division interval of the plurality of upstream wavelengths is 2.4nm.

In a possible implementation manner, the optical communication system further includes an intermediate device, where the intermediate device includes a first demultiplexer and an optical combiner, the intermediate device is connected to the central optical module through an optical fiber, and the intermediate device is further connected to the multiple access side optical modules through optical fibers respectively;

The first demultiplexer is configured to demultiplex the composite downlink optical signal received through the optical fiber to obtain a plurality of downlink optical signals, and send corresponding downlink optical signals to the plurality of access side optical modules through the optical fiber based on respective downlink wavelengths of the plurality of downlink optical signals obtained by demultiplexing;

The optical combiner is used for combining a plurality of uplink optical signals from the access side optical modules to obtain a composite uplink optical signal, and transmitting the composite uplink optical signal to the central optical module through an optical fiber.

In a possible implementation manner, the intermediate device further comprises at least one uplink interface and a plurality of downlink interfaces, the intermediate device is connected with the central optical module through optical fibers via the at least one uplink interface, and the intermediate device is respectively connected with the plurality of access side optical modules through optical fibers via the plurality of downlink interfaces;

The intermediate device is configured to receive the composite downlink optical signal and send the composite uplink optical signal through the at least one uplink interface;

The intermediate device is configured to send corresponding downlink optical signals to the plurality of access side optical modules through the plurality of downlink interfaces, where each downlink interface in the plurality of downlink interfaces sends a downlink optical signal, and downlink wavelengths of optical signals sent by different downlink interfaces in the plurality of downlink interfaces are different;

The intermediate device is configured to receive, through the plurality of downlink interfaces, corresponding uplink optical signals sent by the plurality of access side optical modules, where each downlink interface in the plurality of downlink interfaces receives an uplink optical signal, and uplink wavelengths of optical signals received by different downlink interfaces in the plurality of downlink interfaces are different.

In one possible implementation, each of the plurality of downstream interfaces is connected to an optical fiber. That is, the intermediate equipment is connected with the access side light module through a single fiber, so that fiber resources are saved, and the difficulty of fiber deployment is reduced.

In order to realize single-fiber connection between the intermediate device and the access side light module, in one possible implementation manner, the intermediate device further comprises a plurality of first light splitting sheets, the first demultiplexer is respectively connected with the plurality of first light splitting sheets, the light combining device is respectively connected with the plurality of first light splitting sheets, each first light splitting sheet in the plurality of first light splitting sheets is connected with one downlink interface in the plurality of downlink interfaces, and different first light splitting sheets are connected with different downlink interfaces; each access side light module comprises a second light splitting piece, the second light splitting piece is connected with one downlink interface of the intermediate equipment through an optical fiber, the second light splitting pieces in different access side light modules in the plurality of access side light modules are connected with different downlink interfaces of the intermediate equipment, and the second light splitting piece in a first light module in the plurality of access side light modules is connected with a first downlink interface in the plurality of downlink interfaces through a first optical fiber;

The first demultiplexer is specifically configured to transmit a downlink optical signal to each of the plurality of first optical splitters, where one first optical splitter receives one downlink optical signal, and downlink wavelengths of optical signals received by different first optical splitters are different;

each first light splitting sheet is used for transmitting downlink optical signals received by the first light splitting sheet to a downlink interface connected with the first light splitting sheet;

The first downlink interface is used for transmitting the downlink wavelength optical signal received by the first downlink interface to a second light splitting piece in the first optical module through the first optical fiber;

the second light splitting piece in the first optical module is used for transmitting an optical signal with uplink wavelength corresponding to the first optical module to the first downlink interface through the first optical fiber;

each downlink interface is further configured to transmit an uplink optical signal received by the downlink interface to a first optical splitter connected to the downlink interface;

Each first light splitting piece is further used for transmitting an uplink optical signal received by the first light splitting piece to the light combining device;

the optical combiner is specifically configured to receive the plurality of uplink optical signals transmitted by the plurality of first optical splitters, and combine the plurality of uplink optical signals transmitted by the plurality of first optical splitters into the composite uplink optical signal.

In another possible implementation manner, each downlink interface in the plurality of downlink interfaces comprises a first sub-interface and a second sub-interface, the first demultiplexer is respectively connected with the first sub-interfaces in the plurality of downlink interfaces, the light combining device is respectively connected with the second sub-interfaces in the plurality of downlink interfaces, different access side light modules in the plurality of access side light modules are connected with different downlink interfaces of the intermediate device through optical fibers, and the first optical module in the plurality of access side light modules is respectively connected with the first sub-interface and the second sub-interface included in the first downlink interface in the plurality of downlink interfaces through different optical fibers;

The first demultiplexer is specifically configured to transmit the plurality of downlink optical signals to the plurality of first sub-interfaces, where one first sub-interface receives one downlink optical signal, and downlink wavelengths of optical signals received by different first sub-interfaces are different;

a first sub-interface in the first downlink interface is used for transmitting downlink optical signals received by the first sub-interface to the first optical module through the connected optical fiber;

The second sub-interface in the first downlink interface is used for receiving an optical signal of an uplink wavelength corresponding to the first optical module sent by the first optical module through the connected optical fiber;

A second sub-interface of the plurality of downlink interfaces is used for transmitting the optical signal of the uplink wavelength received by the second sub-interface to the optical combiner;

the optical combiner is specifically configured to combine the plurality of uplink optical signals transmitted by the plurality of second sub-interfaces into the composite uplink optical signal. Namely, the intermediate device is connected with the access side light module through double fibers.

In one possible implementation, the light combining device includes an optical coupler. That is, the intermediate device adopts a combination scheme of the demultiplexer and the optical coupler to transmit the optical signal, so that the cost of the intermediate device is low, and meanwhile, the reliability of optical communication can be ensured.

In one possible implementation, the central optical module further includes a downstream interface, and the downstream interface of the central optical module is connected to an optical fiber. I.e. a single fiber connection between the central optical module and the intermediate device.

In the implementation modes of single-fiber connection between the central optical module and the intermediate equipment and between the intermediate equipment and the access side optical module, the connection mode between the equipment is simpler, the difficulty of optical networking is lower, the use amount of optical fibers is less, and the optical fiber resources are saved.

In order to realize single-fiber connection between the central optical module and the intermediate equipment, in one possible implementation manner, the central optical module further comprises a fourth beam splitter, a first multiplexer, a second demultiplexer and a photoelectric conversion device, wherein the fourth beam splitter is connected with a downlink interface of the central optical module, and the fourth beam splitter is further connected with the first multiplexer and the second demultiplexer respectively;

The fixed wavelength laser is used for generating the downlink optical signals according to a plurality of first electrical signals, and the first electrical signals are electrical signals input by the routing switching equipment;

The first multiplexer is configured to combine the plurality of downlink optical signals into the composite downlink optical signal, and transmit the composite downlink optical signal to the fourth optical splitter;

the fourth optical splitter is configured to send the composite downlink optical signal through the downlink interface of the central optical module, receive, from the downlink interface of the central optical module, the composite uplink optical signal transmitted on the connected optical fiber, and transmit the composite uplink optical signal to the second demultiplexer;

the second demultiplexer is configured to receive the composite uplink optical signal transmitted by the fourth optical splitter, and demultiplex the plurality of uplink optical signals from the composite uplink optical signal;

the optical-to-electrical conversion device is configured to convert the plurality of uplink optical signals demultiplexed by the second demultiplexer into a plurality of second electrical signals, and output the plurality of second electrical signals to the routing switch device.

In order to realize single-fiber connection between the central optical module and the intermediate equipment, in another possible implementation manner, the central optical module further comprises a second multiplexer, a third demultiplexer and a photoelectric conversion device, wherein the second multiplexer is connected with a downlink interface of the central optical module, and the second multiplexer is further connected with the third demultiplexer;

The second multiplexer is configured to combine the plurality of downlink optical signals into the composite downlink optical signal, send the composite downlink optical signal through a downlink interface of the central optical module, receive a composite uplink optical signal transmitted on an optical fiber connected to the downlink interface of the central optical module, and transmit the composite uplink optical signal to the third demultiplexer;

the third demultiplexer is configured to receive the composite uplink optical signal transmitted by the second demultiplexer, and demultiplex the plurality of uplink optical signals from the composite uplink optical signal;

the optical-to-electrical conversion device is configured to convert the plurality of uplink optical signals demultiplexed by the third demultiplexer into a plurality of second electrical signals, and output the plurality of second electrical signals to the routing switch device.

In order to realize single-fiber connection between the central optical module and the intermediate equipment, in another possible implementation manner, the central optical module further comprises a multiplexing demultiplexer and a photoelectric conversion device, and the multiplexing demultiplexer is connected with a downlink interface of the central optical module;

The multiplexing demultiplexer is configured to combine the plurality of downlink optical signals into the composite downlink optical signal, send the composite downlink optical signal through a downlink interface of the central optical module, and receive a composite uplink optical signal transmitted on an optical fiber connected to the downlink interface of the central optical module, and demultiplex the plurality of uplink optical signals from the composite uplink optical signal;

The optical-to-electrical conversion device is configured to convert the plurality of uplink optical signals demultiplexed by the multiplexer-demultiplexer into a plurality of second electrical signals, and output the plurality of second electrical signals to the routing switch device.

In order to realize single-fiber connection between the central optical module and the intermediate equipment, in one possible implementation manner, the intermediate equipment further comprises an uplink interface and a third beam splitter, wherein the uplink interface is connected with a downlink interface of the central optical module through an optical fiber, and the third beam splitter is respectively connected with the uplink interface, the first demultiplexer and the light combining device;

The third optical splitter is configured to receive, through the uplink interface, a composite downlink optical signal sent by the central optical module, and transmit the composite downlink optical signal to the first demultiplexer;

The third light splitting piece is further configured to receive the composite uplink optical signal transmitted by the light combining device, and send the composite uplink optical signal to the central optical module through the uplink interface.

In another possible implementation manner, the central optical module further includes a second downlink interface, a third downlink interface, a first multiplexer, a second demultiplexer, and a photoelectric conversion device, where the first multiplexer is connected to the second downlink interface, and the second demultiplexer is connected to the third downlink interface;

The first multiplexer is configured to combine the plurality of downlink optical signals into the composite downlink optical signal, and send the combined composite downlink optical signal through the second downlink interface;

the second demultiplexer is configured to demultiplex the plurality of uplink optical signals from the composite uplink optical signals received by the third downlink interface;

the photoelectric conversion device is used for converting the plurality of uplink optical signals into a plurality of second electrical signals and outputting the plurality of second electrical signals to the routing switch equipment. I.e. a dual-fiber connection between the central optical module and the intermediate device.

In order to realize dual-fiber connection between the central optical module and the intermediate equipment, in one possible implementation manner, the intermediate equipment comprises a first uplink interface and a second uplink interface, wherein the first uplink interface is connected with a second downlink interface of the central optical module, and the second uplink interface is connected with a third downlink interface of the central optical module through optical fibers;

the first demultiplexer is configured to receive, through the first uplink interface, a composite downlink optical signal sent by the central optical module;

the optical combiner is configured to send the composite uplink optical signal to the central optical module through the second uplink interface.

In one possible implementation, each of the access-side optical modules further includes a photoelectric converter having the capability of processing optical signals of different downstream wavelengths;

The adjustable wavelength laser is used for generating an optical signal of an uplink wavelength corresponding to the access side optical module according to a third electrical signal, and the third electrical signal is an electrical signal input by access equipment;

The photoelectric converter is used for performing photoelectric conversion on the optical signal of the downlink wavelength received by the access side optical module to which the photoelectric converter belongs so as to obtain a fourth electric signal, and outputting the fourth electric signal to the access equipment.

In one possible implementation, the central optical module integrates or inserts a routing switch, and the downstream wavelength optical signal carries downstream information sent by the routing switch, and/or,

And each access side light module in the plurality of access side light modules is integrated or inserted into an access device, and the optical signal of the uplink wavelength carries uplink information sent by the access device.

The downlink information comprises a downlink instruction and/or downlink data, and the uplink information comprises an uplink response and/or uplink data.

In a second aspect, an optical communication method is provided, where an optical communication system includes a plurality of access side optical modules, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules are different, and the wavelength division intervals of the plurality of downlink wavelengths are greater than the wavelength division intervals of the plurality of uplink wavelengths, and the method is applied to a first optical module of the plurality of access side optical modules, where the first optical module is any one of the plurality of access side optical modules, and the method includes:

Receiving a downlink optical signal, wherein the wavelength of the downlink optical signal is a first downlink wavelength corresponding to the first optical module;

and generating and transmitting an uplink optical signal, wherein the wavelength of the uplink optical signal is a first uplink wavelength corresponding to the first optical module.

In one possible implementation, the wavelength division intervals of the plurality of downlink wavelengths are determined based on a Coarse Wavelength Division Multiplexing (CWDM) mode, and the wavelength division intervals of the plurality of uplink wavelengths are determined based on a Dense Wavelength Division Multiplexing (DWDM) mode.

In one possible implementation, the first threshold is 20 nanometers and the second threshold is 2.5 nanometers.

In one possible implementation, the first optical module includes an optical-to-electrical converter having the ability to process optical signals of different downstream wavelengths and an adjustable wavelength laser having the ability to generate optical signals of different upstream wavelengths, the method further comprising:

the photoelectric converter performs photoelectric conversion on the downlink optical signal, so as to obtain a first electric signal;

the generating and transmitting the uplink optical signal includes:

The tunable wavelength laser generates and transmits the upstream optical signal.

In one possible implementation manner, the first optical module is integrated or inserted into a first access device, the downlink optical signal carries downlink information transmitted to the first access device, and the optical-to-electrical converter performs optical-to-electrical conversion on the downlink optical signal, so as to obtain a first electrical signal, where the method further includes:

the photoelectric converter transmits the first electrical signal to the first access device;

before the tunable wavelength laser generates and transmits the upstream optical signal, the method further includes:

and receiving a second electric signal transmitted by the first access device, wherein the uplink optical signal carries uplink information sent by the first access device through the second electric signal.

In one possible implementation manner, the first optical module includes an uplink interface and a beam splitter, where the uplink interface is connected to the first optical fiber, and the beam splitter is connected to the uplink interface;

The receiving the downlink optical signal includes:

The optical splitter receives the downlink optical signal transmitted by the first optical fiber through the uplink interface and transmits the downlink optical signal to the photoelectric converter;

The sending the uplink optical signal includes:

and the optical splitter transmits the uplink optical signal generated by the wavelength-adjustable laser to the first optical fiber through the uplink interface.

In a possible implementation manner, the first optical module includes a first uplink interface and a second uplink interface, where the first uplink interface and the second uplink interface are respectively connected with different optical fibers;

The receiving the downlink optical signal includes:

The first uplink interface receives the downlink optical signal transmitted on the connected optical fiber and transmits the downlink optical signal to the photoelectric converter;

The sending the uplink optical signal includes:

And the second uplink interface transmits the uplink optical signal generated by the wavelength-adjustable laser through the connected optical fiber.

In one possible implementation, the tunable wavelength laser employs a distributed bragg reflector (distributed Bragg reflector, DBR) laser, an electro-absorption (electro absorption, EA) modulated DBR laser, a Littman structure tunable external cavity semiconductor laser (tunable external cavity semiconductor laser, TECDL), a Littman-metalf structure TECDL, a fiber bragg grating type tunable external cavity semiconductor laser (fiber Bragg grating tunable external cavity semiconductor laser, FBG-TECDL), a micro-ring (MRR) tunable laser, a fully integrated tunable laser based on-chip semiconductor optical amplification (semiconductor optical amplifier, SOA), a Fabry-perot (FP) laser, a distributed feedback (distributed feedback, DFB) laser array, or a self-locking or injection locking mode of the light emitting assembly (TRANSMITTER OPTICAL SUBASSEMBLY, TOSA) to achieve tuning of the emission wavelength.

In one possible implementation, the photoelectric converter employs a P-type semiconductor-impurity-N-type semiconductor (PIN), avalanche photodiode (AVALANCHE PHOTO DIODE, APD), or SOA-PIN integrated photodetector to achieve photoelectric conversion.

In a third aspect, an optical communication method is provided, where the method is applied to a central optical module in an optical communication system, where the optical communication system further includes a plurality of access side optical modules, where the plurality of access side optical modules corresponds to a plurality of uplink wavelengths, and where the plurality of access side optical modules corresponds to a plurality of downlink wavelengths, where downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, where uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, where the central optical module includes a fixed wavelength laser, where the fixed wavelength laser is used to generate optical signals with a plurality of fixed wavelengths, where the plurality of fixed wavelengths includes the plurality of downlink wavelengths, and where the method includes:

Transmitting a plurality of downlink optical signals generated by the fixed wavelength laser, wherein the wavelengths of the plurality of downlink optical signals are respectively the plurality of downlink wavelengths;

Receiving a plurality of uplink optical signals, wherein the wavelengths of the plurality of uplink optical signals are respectively the plurality of uplink wavelengths;

wherein, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths.

In one possible implementation, the plurality of downstream optical signals are transmitted based on a Coarse Wavelength Division Multiplexing (CWDM) mode, and the plurality of upstream optical signals are transmitted based on a Dense Wavelength Division Multiplexing (DWDM) mode.

In one possible implementation, the central optical module further includes a multiplexer and at least one downstream interface, the downstream interface being connected to an optical fiber;

the transmitting a plurality of downlink optical signals includes:

The multiplexer combines the downlink optical signals generated by the fixed wavelength laser into a composite downlink optical signal, and sends the composite downlink optical signal through the downlink interface.

In one possible implementation, the central optical module is integrated or plugged into a routing switch device;

The fixed wavelength laser generates the downlink optical signals according to the first electrical signals input by the route switching device, the downlink optical signals bear downlink information sent by the route switching device through the first electrical signals, the first electrical signals correspond to the access side optical modules one by one, and the downlink information comprises information sent to the access side optical modules.

In one possible implementation, the central optical module further includes a photoelectric conversion device and a demultiplexer;

the receiving a plurality of uplink optical signals includes:

receiving and compounding an uplink optical signal through the downlink interface;

the demultiplexer demultiplexes the plurality of uplink optical signals from the composite uplink optical signal, where the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the routing switch device;

The method further comprises the steps of:

The photoelectric conversion device performs photoelectric conversion on the plurality of uplink optical signals respectively, so as to obtain a plurality of second electric signals;

the plurality of second electrical signals are sent to the routing switch device.

In one possible implementation manner, the central optical module includes a downstream interface and a splitter, where the splitter is connected to the multiplexer and the demultiplexer respectively, and the splitter is further connected to the downstream interface;

the sending the composite downlink optical signal through the downlink interface includes:

the multiplexer transmits the composite downlink optical signal to the optical splitter, and the optical splitter transmits the composite downlink optical signal to the downlink interface;

the receiving, by the downstream interface, the composite upstream optical signal includes:

And the optical splitter receives the composite uplink optical signal transmitted on the connected optical fiber through the downlink interface and transmits the composite uplink optical signal to the demultiplexer.

In a possible implementation manner, the central optical module comprises a downlink interface, and the multiplexer is connected with the demultiplexer and is also connected with the downlink interface;

The multiplexer sends the composite downlink optical signal to the downlink interface;

the multiplexer receives the composite uplink optical signal transmitted on the connected optical fiber through the downlink interface, and transmits the composite uplink optical signal to the demultiplexer.

In a possible implementation manner, the central optical module comprises a downlink interface and a photoelectric conversion device, and the multiplexer is connected with the downlink interface;

The multiplexer receives a composite uplink optical signal transmitted on the connected optical fiber through the downlink interface;

After the multiplexer receives the composite upstream optical signal transmitted on the connected optical fiber through the downstream interface, the method further includes:

The multiplexer demultiplexes the plurality of uplink optical signals from the composite uplink optical signal, and the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the routing switching equipment;

In a possible implementation manner, the central optical module further comprises a first downlink interface and a second downlink interface, the multiplexer is connected with the first downlink interface, the demultiplexer is connected with the second downlink interface, and the first downlink interface and the second downlink interface are respectively connected with different optical fibers;

The multiplexer transmits the composite downlink optical signal through the connected first downlink interface;

The demultiplexer receives the composite uplink optical signal through the connected second downlink interface.

In a fourth aspect, an optical communication method is provided, where the method is applied to an intermediate device included in an optical communication system, the optical communication system further includes a plurality of access side light modules, where the plurality of access side light modules correspond to a plurality of uplink wavelengths, and the plurality of access side light modules correspond to a plurality of downlink wavelengths, where downlink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and where uplink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and the intermediate device includes a demultiplexer and an optical coupler, where the method includes:

receiving a composite downlink optical signal, wherein the composite downlink optical signal comprises a plurality of downlink optical signals;

Demultiplexing the plurality of downlink optical signals from the composite downlink optical signal by the demultiplexer;

Transmitting corresponding downlink optical signals to the access side optical modules based on respective downlink wavelengths of the downlink optical signals obtained by demultiplexing;

combining a plurality of uplink optical signals from the plurality of access side optical modules through the optical coupler so as to obtain a combined uplink optical signal;

And transmitting the composite uplink optical signal.

In one possible implementation, the wavelength division interval of the plurality of downstream wavelengths is greater than the wavelength division interval of the plurality of upstream wavelengths.

In one possible implementation, the plurality of downlink optical signals included in the composite downlink optical signal are transmitted based on a Coarse Wavelength Division Multiplexing (CWDM) mode, and the plurality of uplink optical signals included in the composite uplink optical signal are transmitted based on a Dense Wavelength Division Multiplexing (DWDM) mode.

In a possible implementation manner, the intermediate device further comprises at least one uplink interface and a plurality of downlink interfaces, and the uplink interfaces and the downlink interfaces are respectively connected with optical fibers;

receiving the composite downlink optical signal and transmitting the composite uplink optical signal through the at least one uplink interface;

Transmitting corresponding downlink optical signals to the plurality of access side optical modules through the plurality of downlink interfaces, wherein each downlink interface in the plurality of downlink interfaces transmits an optical signal with a downlink wavelength, and the downlink wavelengths of the optical signals transmitted by different downlink interfaces in the plurality of downlink interfaces are different;

And receiving corresponding uplink optical signals sent by the access side optical modules through the plurality of downlink interfaces, wherein each downlink interface in the plurality of downlink interfaces receives an optical signal with a downlink wavelength, and the uplink wavelengths of the optical signals received by different downlink interfaces in the plurality of downlink interfaces are different.

In one possible implementation, each of the upstream and downstream interfaces is connected to a respective optical fiber.

In a possible implementation manner, the intermediate device further includes a plurality of first optical splitters, the demultiplexer is connected to the plurality of first optical splitters respectively, the optical coupler is connected to the plurality of first optical splitters respectively, each first optical splitter of the plurality of first optical splitters is connected to one downlink interface of the plurality of downlink interfaces, and a different first optical splitter is connected to a different downlink interface;

the sending, by the plurality of downlink interfaces, corresponding downlink optical signals to the plurality of access side optical modules includes:

The demultiplexer transmits one downlink optical signal to each of the plurality of first optical splitters, wherein one first optical splitter receives one downlink optical signal, and downlink wavelengths of optical signals received by different first optical splitters are different;

the plurality of first light splitting sheets respectively transmit downlink optical signals received by the first light splitting sheets to downlink interfaces connected with the first light splitting sheets;

Each downlink interface in the plurality of downlink interfaces transmits a downlink optical signal received by the corresponding optical fiber;

before the optical coupler combines the plurality of uplink optical signals from the plurality of access side optical modules to obtain a combined uplink optical signal, the method further includes:

Each downlink interface in the plurality of downlink interfaces receives an uplink optical signal transmitted by an optical fiber connected with the downlink interface, wherein one downlink interface receives an uplink optical signal, and downlink wavelengths of optical signals received by different downlink interfaces are different;

Each downlink interface in the plurality of downlink interfaces transmits the uplink optical signals respectively received to the first optical splitter connected with the downlink interfaces respectively;

the plurality of first optical splitters respectively transmit the received uplink optical signals to the optical coupler.

In a possible implementation manner, each downlink interface in the plurality of downlink interfaces includes a first sub-interface and a second sub-interface, the demultiplexer is respectively connected with the first sub-interfaces in the plurality of downlink interfaces, the optical coupler is respectively connected with the second sub-interfaces in the plurality of downlink interfaces, and the second sub-interface and the first sub-interface in each downlink interface are respectively connected with different optical fibers;

The demultiplexer transmits the plurality of downlink optical signals to the plurality of first sub-interfaces, wherein one first sub-interface receives one downlink optical signal, and downlink wavelengths of optical signals received by different first sub-interfaces are different;

a first sub-interface in each downlink interface transmits downlink optical signals received by the first sub-interface through the connected optical fiber;

The receiving, by the plurality of downlink interfaces, the corresponding uplink optical signals sent by the plurality of access side optical modules includes:

and a second sub-interface in the plurality of downlink interfaces receives an uplink optical signal transmitted by an optical fiber connected with the second sub-interface, and transmits the uplink optical signal received by the second sub-interface to the optical coupler.

In one possible implementation manner, the intermediate device includes an upstream interface and a second splitter, where the upstream interface is connected to an optical fiber, and the second splitter is connected to the upstream interface, the demultiplexer, and the optical coupler respectively;

receiving the composite downstream optical signal through the at least one upstream interface, comprising:

the uplink interface receives a composite downlink optical signal transmitted by the connected optical fiber and transmits the received composite downlink optical signal to the second light splitting piece;

The second beam splitter transmits the composite downlink optical signal to the demultiplexer;

transmitting the composite uplink optical signal through the at least one uplink interface, including:

the optical coupler transmits the composite uplink optical signal to the second beam splitter;

The second beam splitter transmits the composite uplink optical signal to the uplink interface;

And the uplink interface transmits the composite uplink optical signal through the connected optical fiber.

In a possible implementation manner, the intermediate device includes a first uplink interface and a second uplink interface, where the first uplink interface and the second uplink interface are connected to different optical fibers, the demultiplexer is connected to the first uplink interface, and the optical coupler is connected to the second uplink interface;

the receiving the composite downlink optical signal through the at least one uplink interface includes:

the first uplink interface receives a composite downlink optical signal transmitted on the connected optical fiber;

the first uplink interface transmits the composite downlink optical signal to the demultiplexer;

the sending the composite uplink optical signal through the at least one uplink interface includes:

the optical coupler transmits the composite uplink optical signal to the second uplink interface;

and the second uplink interface sends the composite uplink optical signal to the connected optical fiber.

In a fifth aspect, there is provided a communication apparatus having a function of realizing the behavior of the optical communication method in the above second aspect. That is, the communication device may be the first optical module in the second aspect described above. The communication device comprises one or more modules for implementing the optical communication method provided in the second aspect.

That is, a first optical module is provided, the first optical module is any one of a plurality of access side optical modules included in an optical communication system, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules are also different, and the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths;

The optical receiving component is configured to receive a downlink optical signal transmitted by the optical fiber interface, where a wavelength of the downlink optical signal is a first downlink wavelength corresponding to the first optical module;

the optical transmitting assembly is configured to generate an uplink optical signal, and send the uplink optical signal through the optical fiber interface, where a wavelength of the uplink optical signal is a first uplink wavelength corresponding to the first optical module.

In one possible implementation, the light receiving assembly includes an optical-to-electrical converter, and the light emitting assembly includes a tunable wavelength laser having the ability to process optical signals of different downstream wavelengths, and the tunable wavelength laser has the ability to generate optical signals of different upstream wavelengths;

the photoelectric converter is used for performing photoelectric conversion on the downlink optical signal so as to obtain a first electric signal;

the adjustable wavelength laser is used for generating and sending the uplink optical signal through the optical fiber interface.

In one possible implementation manner, the first optical module is integrated or inserted into a first access device, and the downlink optical signal carries downlink information transmitted to the first access device;

The photoelectric converter is further configured to transmit the first electrical signal to the first access device;

The wavelength-adjustable laser is further configured to receive a second electrical signal transmitted by the first access device, and the uplink optical signal carries uplink information sent by the first access device through the second electrical signal.

In one possible implementation manner, the optical fiber interface includes an uplink interface, the first optical module further includes a light splitting sheet, the uplink interface is connected to the first optical fiber, and the light splitting sheet is connected to the uplink interface;

The light splitting piece is configured to receive the downlink optical signal transmitted by the first optical fiber through the uplink interface, and transmit the downlink optical signal to the photoelectric converter;

the optical splitter is further configured to send, through the uplink interface, the uplink optical signal generated by the wavelength-adjustable laser to the first optical fiber.

In one possible implementation manner, the optical fiber interface includes a first uplink interface and a second uplink interface, and the first uplink interface and the second uplink interface are respectively connected with different optical fibers;

The first uplink interface is configured to receive the downlink optical signal transmitted on the connected optical fiber, and transmit the downlink optical signal to the optical-electrical converter;

The second uplink interface is configured to send, through the connected optical fiber, the uplink optical signal generated by the tunable wavelength laser.

In one possible implementation, the tunable wavelength laser uses a DBR laser, an EA-modulated DBR laser, a Littman structure TECDL, littman-Metcalf structure TECDL, an FBG-TECDL, an MRR tunable laser, a fully integrated tunable laser based on an SOA, an FP laser, a DFB laser array, or a TOSA, to implement the adjustment of the emission wavelength in a self-locking or injection locking manner.

In one possible implementation, the photoelectric converter implements photoelectric conversion using a PIN, APD, or SOA-PIN integrated photodetector.

In a sixth aspect, there is provided a communication apparatus having a function of realizing the behavior of the optical communication method in the above third aspect. That is, the communication device may be the central optical module in the third aspect described above. The communication device comprises one or more modules for implementing the optical communication method provided in the third aspect.

That is, a central optical module is provided, where the central optical module is included in an optical communication system, the optical communication system further includes a plurality of access side optical modules, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, and the plurality of access side optical modules correspond to a plurality of downlink wavelengths, downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the central optical module includes a fixed wavelength laser, the fixed wavelength laser is used to generate optical signals with a plurality of fixed wavelengths, and the plurality of fixed wavelengths include the plurality of downlink wavelengths;

the optical transmitting assembly is configured to transmit a plurality of downlink optical signals through the optical fiber interface, where the plurality of downlink optical signals are generated by the fixed wavelength laser, and wavelengths of the plurality of downlink optical signals are the plurality of downlink wavelengths respectively;

The optical receiving component is configured to receive a plurality of uplink optical signals through the optical fiber interface, where wavelengths of the plurality of uplink optical signals are respectively the plurality of uplink wavelengths;

In one possible implementation, the optical transmission assembly includes a multiplexer, and the optical fiber interface includes at least one downstream interface, and the downstream interface is connected to an optical fiber;

The multiplexer is configured to combine the plurality of downlink optical signals generated by the fixed wavelength laser into a composite downlink optical signal, and send the composite downlink optical signal through the downlink interface.

the fixed wavelength laser is configured to generate the plurality of downlink optical signals according to a plurality of first electrical signals input by the routing switch device, where the plurality of downlink optical signals carry downlink information sent by the routing switch device through the plurality of first electrical signals, the plurality of first electrical signals are in one-to-one correspondence with the plurality of access side optical modules, and the downlink information includes information sent to the plurality of access side optical modules.

In one possible implementation, the optical receiving assembly includes a demultiplexer, and the central optical module further includes a photoelectric conversion device;

the demultiplexer is configured to receive and combine an uplink optical signal through the downlink interface;

The demultiplexer is further configured to demultiplex the plurality of uplink optical signals from the composite uplink optical signal, where the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the routing switch device;

the photoelectric conversion device is configured to perform photoelectric conversion on the plurality of uplink optical signals, so as to obtain a plurality of second electrical signals, and send the plurality of second electrical signals to the routing switch device.

In a possible implementation manner, the at least one downlink interface includes a downlink interface, the central optical module further includes a beam splitter, and the beam splitter is connected to the multiplexer and the demultiplexer respectively, and is further connected to the downlink interface;

the multiplexer is used for transmitting the composite downlink optical signal to the optical splitter;

the beam splitter is configured to send the composite downlink optical signal to the downlink interface;

The optical splitter is further configured to receive, through the downstream interface, a composite upstream optical signal transmitted on the connected optical fiber, and transmit the composite upstream optical signal to the demultiplexer.

In a possible implementation manner, the at least one downlink interface includes a downlink interface, and the multiplexer is connected to the demultiplexer, and is further connected to the downlink interface;

The multiplexer is configured to send the composite downlink optical signal to the downlink interface;

The multiplexer is further configured to receive, through the downlink interface, a composite uplink optical signal transmitted on the connected optical fiber, and transmit the composite uplink optical signal to the demultiplexer.

In a possible implementation manner, the at least one downlink interface includes a downlink interface, the central optical module further includes a photoelectric conversion device, and the multiplexer is connected with the downlink interface;

The multiplexer is further configured to receive, through the downlink interface, a composite uplink optical signal transmitted on the connected optical fiber;

The multiplexer is further configured to demultiplex the plurality of uplink optical signals from the composite uplink optical signal, where the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the routing switching device;

In a possible implementation manner, the at least one downlink interface includes a first downlink interface and a second downlink interface, the multiplexer is connected with the first downlink interface, the demultiplexer is connected with the second downlink interface, and the first downlink interface and the second downlink interface are respectively connected with different optical fibers;

The multiplexer is configured to send the composite downlink optical signal through the connected first downlink interface;

The demultiplexer is configured to receive the composite uplink optical signal through the connected second downlink interface.

In a seventh aspect, there is provided a communication apparatus having a function of realizing the optical communication method behavior in the fourth aspect described above. That is, the communication apparatus may be an intermediate device in the fourth aspect described above. The communication device includes one or more modules for implementing the optical communication method provided in the fourth aspect.

That is, an intermediate device is provided, where the intermediate device is included in an optical communication system, the optical communication system further includes a plurality of access side light modules, the plurality of access side light modules correspond to a plurality of uplink wavelengths, the plurality of access side light modules correspond to a plurality of downlink wavelengths, downlink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and uplink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and the intermediate device includes an optical fiber interface, a demultiplexer, and an optical coupler;

The optical fiber interface is used for receiving a composite downlink optical signal, and the composite downlink optical signal comprises a plurality of downlink optical signals;

The demultiplexer is configured to demultiplex the plurality of downlink optical signals from the composite downlink optical signal, and send corresponding downlink optical signals to the plurality of access-side optical modules based on respective downlink wavelengths of the plurality of downlink optical signals obtained by demultiplexing;

The optical coupler is used for combining a plurality of uplink optical signals from the access side optical modules so as to obtain a combined uplink optical signal;

The optical fiber interface is further configured to send the composite uplink optical signal.

In a possible implementation manner, the optical fiber interface comprises at least one uplink interface and a plurality of downlink interfaces, and the uplink interfaces and the downlink interfaces are respectively connected with optical fibers;

the at least one uplink interface is configured to receive the composite downlink optical signal and send the composite uplink optical signal;

The plurality of downlink interfaces are used for sending corresponding downlink optical signals to the plurality of access side optical modules, wherein each downlink interface in the plurality of downlink interfaces sends an optical signal with a downlink wavelength, and the downlink wavelengths of the optical signals sent by different downlink interfaces in the plurality of downlink interfaces are different;

The plurality of downlink interfaces are further configured to receive corresponding uplink optical signals sent by the plurality of access side optical modules, where each downlink interface in the plurality of downlink interfaces receives an optical signal with a downlink wavelength, and uplink wavelengths of optical signals received by different downlink interfaces in the plurality of downlink interfaces are different.

The demultiplexer is configured to transmit a downlink optical signal to each of the plurality of first optical splitters, where one first optical splitter receives one downlink optical signal, and downlink wavelengths of optical signals received by different first optical splitters are different;

the plurality of first light splitting sheets are used for respectively transmitting downlink optical signals received by the respective connected downlink interfaces;

Each downlink interface in the plurality of downlink interfaces is used for transmitting a downlink optical signal received by the corresponding optical fiber;

Each downlink interface of the plurality of downlink interfaces is further configured to receive an uplink optical signal transmitted by a respective connected optical fiber, where one downlink interface receives an uplink optical signal, and downlink wavelengths of optical signals received by different downlink interfaces are different;

each downlink interface in the plurality of downlink interfaces is further configured to transmit, to the first optical splitter connected to each downlink interface, a received uplink optical signal;

the plurality of first light splitting pieces are further used for respectively transmitting the received uplink optical signals to the optical coupler.

the demultiplexer is configured to transmit the plurality of downlink optical signals to the plurality of first sub-interfaces, where one first sub-interface receives one downlink optical signal, and downlink wavelengths of optical signals received by different first sub-interfaces are different;

a first sub-interface in each downlink interface is used for sending downlink optical signals received by the first sub-interface through the connected optical fiber;

and the second sub-interface of the plurality of downlink interfaces is used for receiving the uplink optical signals transmitted by the optical fibers connected with the second sub-interface and transmitting the uplink optical signals received by the second sub-interface to the optical coupler.

In a possible implementation manner, the optical fiber interface includes an uplink interface, and the intermediate device further includes a second optical splitter, where the uplink interface is connected to an optical fiber, and the second optical splitter is connected to the uplink interface, the demultiplexer, and the optical coupler respectively;

the uplink interface is used for receiving the composite downlink optical signal transmitted by the connected optical fiber and transmitting the received composite downlink optical signal to the second light splitting piece;

The second beam splitter is configured to send the composite downlink optical signal to the demultiplexer;

the optical coupler is used for transmitting the composite uplink optical signal to the second beam splitter;

The second light splitting piece is used for transmitting the composite uplink optical signal to the uplink interface;

the uplink interface is further configured to send the composite uplink optical signal through the connected optical fiber.

In a possible implementation manner, the optical fiber interface includes a first uplink interface and a second uplink interface, the first uplink interface and the second uplink interface are respectively connected with different optical fibers, the demultiplexer is connected with the first uplink interface, and the optical coupler is connected with the second uplink interface;

The first uplink interface is configured to receive a composite downlink optical signal transmitted on a connected optical fiber, and transmit the composite downlink optical signal to the demultiplexer;

The optical coupler is used for transmitting the composite uplink optical signal to the second uplink interface;

And the second uplink interface is used for sending the composite uplink optical signal to the connected optical fiber.

In an eighth aspect, there is provided a network device comprising a processor and a memory for storing a program for executing the optical communication method provided in the second aspect or the third aspect or the fourth aspect described above, and for storing data involved in implementing the optical communication method provided in the second aspect or the third aspect or the fourth aspect described above. The processor is configured to execute a program stored in the memory.

In one possible implementation, the network device may further include a communication bus for establishing a connection between the processor and the memory.

In a ninth aspect, there is provided a computer-readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform the optical communication method provided in the second or third or fourth aspect above.

In a tenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the optical communication method provided in the second or third or fourth aspects above.

The technical effects obtained in the second to tenth aspects are similar to those obtained in the corresponding technical means in the first aspect, and are not described in detail herein.

Drawings

Fig. 1 is a schematic diagram of an optical communication system according to an embodiment of the present application;

Fig. 2 is a schematic diagram of another optical communication system according to an embodiment of the present application;

FIG. 3 is a block diagram of yet another optical communication system according to an embodiment of the present application;

FIG. 4 is a block diagram of yet another optical communication system according to an embodiment of the present application;

FIG. 5 is a block diagram of yet another optical communication system according to an embodiment of the present application;

FIG. 6 is a block diagram of yet another optical communication system according to an embodiment of the present application;

FIG. 7 is a block diagram of yet another optical communication system according to an embodiment of the present application;

fig. 8 is a schematic diagram of yet another optical communication system according to an embodiment of the present application;

Fig. 9 is a schematic diagram of yet another optical communication system according to an embodiment of the present application;

fig. 10 is a flowchart of an optical communication method according to an embodiment of the present application;

FIG. 11 is a flowchart of another optical communication method according to an embodiment of the present application;

FIG. 12 is a flow chart of yet another optical communication method provided by an embodiment of the present application;

Fig. 13 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings.

For ease of understanding, some terms/nouns referred to in the embodiments of the application will first be described.

1. Point-to-multipoint (P2 MP) a transmission mode in which data is transmitted from a source to one or more receiving ends.

2. The passive optical network (passive optical network, PON) is an emerging broadband access optical fiber technology covering the last kilometer, and does not need node equipment at an optical branching point, and only needs to install a simple optical branching device, so that the passive optical network has the advantages of saving optical cable resources, sharing bandwidth resources, saving machine room investment, high equipment safety, high networking speed, low comprehensive networking cost and the like. The intermediate device in the embodiment of the application is a passive device and can be applied to a passive optical network.

3. Multiplexing technology, namely, with the gradual progress of optical copper feeding and discharging, becomes the main technical flow of a park network, on one hand, because of limited resources, the manufacturing cost is continuously increased, the laying cost of an optical fiber link is also increased year by year, and meanwhile, for a wireless transmission medium, the limited available frequency is also a valuable resource. Therefore, an increase in the utilization rate of communication lines has become an important point, and multiplexing technology (abbreviated as multiplexing technology) has been developed. Multiplexing is a technique that improves the utilization of an optical communication line by transmitting multiple signals over one communication line. The most commonly used multiplexing techniques at present are wavelength division multiplexing, time division multiplexing, frequency division multiplexing, and code division multiplexing. The embodiments of the present application focus on wavelength division multiplexing.

4. Wavelength division multiplexing (wave division multiplexing, WDM), abbreviated as wavelength division, typically uses multiple wavelengths to accomplish multiplexing. WDM is a data transmission technology in which different optical signals are carried by different wavelengths (i.e., colors or frequencies), and WDM refers to a technology of multiplexing a plurality of optical signals of different wavelengths to be transmitted on one optical fiber. The optical communication system and the method provided by the embodiment of the application are applied to the wavelength division system, and can solve the problems of higher production cost and higher deployment difficulty of the access side light module in the wavelength division system of the related technology.

5. The wavelength division interval (also referred to as wavelength interval) is that when the wavelength division multiplexing is performed, the interval between every two adjacent uplink wavelengths of a plurality of uplink optical signals transmitted in one optical fiber is the wavelength division interval (simply referred to as uplink wavelength division interval) of the plurality of uplink optical signals after the uplink wavelengths are arranged according to the order of magnitude, and similarly, the interval between every two adjacent downlink wavelengths of a plurality of downlink optical signals transmitted in one optical fiber is the wavelength division interval (simply referred to as downlink wavelength division interval) of the plurality of downlink optical signals after the downlink wavelengths are arranged according to the order of magnitude.

In the embodiment of the application, the downlink wave division interval can be larger than the uplink wave division interval, namely the embodiment of the application provides a mixed wave division scheme. The embodiment of the application does not limit the specific values of the downstream wave separation interval and the upstream wave separation interval. For example, the downstream wavelength division interval may be the same as that of Coarse Wavelength Division Multiplexing (CWDM) in the related art, that is, 20nm, and of course, the downstream wavelength division interval may also be other values, such as 15nm, 25nm, and so on. As an example, there may be 18 downstream wavelength channels (simply referred to as downstream channels) between 1270nm and 1610nm at a wavelength interval of 20nm. The upstream wavelength division interval may be much smaller than the downstream wavelength division interval, for example, may be 0.4nm, 1nm, 2.4nm, 2.5nm, or the like. As an example, there may be 20 upstream wavelength channels (simply referred to as upstream channels) between 1050nm and 1070nm at a wavelength division interval of 1 nm.

6. Two embodiments of WDM, coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM), are the technology of transmitting optical signals of a plurality of different wavelengths with a larger wavelength interval simultaneously in the same optical fiber, and DWDM is the technology of transmitting optical signals of a plurality of different wavelengths with a smaller wavelength interval simultaneously in the same optical fiber. In short, the main difference between CWDM and DWDM is that the wavelength interval of CWDM is large and the wavelength interval of DWDM is relatively small.

In some embodiments of the present application, the downstream optical signal may be CWDM, and the upstream optical signal may be DWDM, that is, the technical solution provided in the embodiments of the present application may be a mixed wavelength division solution in which coarse wavelength and dense wavelength are mixed.

In the related art, the embodiments of WDM include medium wavelength division multiplexing (medium wavelength division multiplexing, MWDM) and local area network wavelength division multiplexing (local area network wave division multiplexing, LAN-WDM, simply LWDM, which may also be called fine wavelength division multiplexing) in addition to both CWDM and DWMD. Wherein the wavelength division interval of CWDM is 20nm, the wavelength division interval of MWDM is 7nm/13nm alternately, the wavelength division interval of LWDM is 4nm, and the wavelength division interval of DWDM is 0.4nm, 0.8nm or 1.6nm. Wherein, the wavelength division interval of MWDM is 7nm/13nm alternation means that wavelength division points are inserted at positions which are shifted by 3.5nm from each other at a plurality of core wavelengths (namely 1271nm, 1291nm, 1311nm and the right and left) of CWDM with a wavelength division interval of 20nm, and the inserted wavelength division points are used as new core wavelengths, thereby forming an interval mode of alternation between 7nm and 13 nm. In other words, MWDM has the core idea of "intermediately" inserting a plurality of core wavelengths having a relatively small wavelength interval between a plurality of core wavelengths having a relatively large wavelength interval, thereby forming two different interval patterns with alternating wavelength intervals, such that the core wavelengths corresponding to the two wavelength intervals are located in the same wavelength band. In contrast to the idea of "intermediate add", there is also the idea of "completely separate" bands, which means that the core wavelengths corresponding to the two wavelength division intervals are located in different bands.

Based on the idea that WDM can be inserted in the middle or completely separated, the wave bands where a plurality of downlink wave lengths are located (called downlink wave segments for short) and the wave bands where a plurality of uplink wave lengths are located (called uplink wave segments for short) in the technical scheme of the application can be completely separated, can be crossed or even can be overlapped. As an example, taking an example in which the plurality of downlink wavelengths corresponding to the downlink optical signal are a plurality of core wavelengths divided at intervals of 20nm between 1270nm and 1610nm, in the case where the downlink and uplink wavelength ranges are completely separated, the plurality of uplink wavelengths corresponding to the uplink optical signal may be a plurality of core wavelengths divided at intervals of 1nm between 1525nm and 1545nm, in the case where the downlink and uplink wavelength ranges intersect, the plurality of uplink wavelengths corresponding to the uplink optical signal may be a plurality of core wavelengths divided at intervals of 1nm between 1260nm and 1280nm, and in the case where the downlink and uplink wavelength ranges coincide, the plurality of uplink wavelengths corresponding to the uplink optical signal may be a plurality of core wavelengths divided at intervals of 1nm between 1270nm and 1610 nm.

It should be noted that the wavelength interval of the uplink optical signal is the interval between every two adjacent uplink wavelengths after the uplink wavelengths corresponding to the access side optical modules are arranged according to the order of magnitude when the system is designed, and the wavelength interval of the downlink optical signal is the interval between every two adjacent downlink wavelengths after the downlink wavelengths corresponding to the access side optical modules are arranged according to the order of magnitude when the system is designed. The adjacent two wavelengths are usually designed at equal intervals, but of course, the adjacent two wavelengths can also be not equally spaced, and the embodiment of the application is not limited to the same. Under the condition of unequal intervals, the minimum allowable wavelength interval of the uplink is smaller than the minimum allowable wavelength interval of the downlink. In addition, the multiple downstream wavelengths and the multiple upstream wavelengths designed for the system may not be all used in practical applications, for example, some channels may be disabled/deactivated, and then the corresponding upstream and downstream wavelengths of the channels may not be used.

Various embodiments of WDM have advantages. The CWDM has the advantages that the wavelength interval is large, the cost of devices such as a filter or a laser used in the CWDM is relatively low, the power consumption is relatively low, the device size is relatively small, the energy conservation is facilitated, the deployment is convenient, the transmission capacity of the optical fiber can be effectively improved, and the optical fiber resource can be effectively utilized and saved. Because the wavelength interval of the DWDM is smaller, the DWDM can enable one laser to have the capability of generating a plurality of optical signals with different wavelengths, and the laser with the capability can be used for realizing the normalization of a plurality of access side light modules, so that the production difficulty and the deployment cost of the access side light modules are reduced. It should be understood that if the wavelength division interval is larger, it is difficult for the hardware layer to implement multiple wavelengths with larger wavelength division interval into one laser, that is, it is difficult for the CWDM to implement normalization of the access side light module, and introducing DWDM technology makes normalization of the access side light module feasible, so that implementation cost of normalization of the access side light module is reduced.

In the embodiment of the present application, "normalization" of the access-side optical modules means that factory settings/configurations of all the access-side optical modules in the optical communication system are the same, for example, wavelength ranges of the light signals that can be transmitted (simply referred to as a transmission wavelength range) are the same, and wavelength ranges of the light signals that can be received (simply referred to as a reception wavelength range) are also the same. All the access side light modules can be plugged and used after leaving the factory, and manufacturers are not required to produce optical modules with different wavelengths according to wavelength grouping. And in the field deployment, network management personnel are not required to plug in access side light modules with different wavelengths for each group of access equipment according to groups, each access side light module can automatically set the emission wavelength according to certain logic, the manual configuration/adjustment of technicians is not required, the set emission wavelength is the uplink wavelength of a corresponding uplink channel, and the emission wavelengths set by different access side light modules are different.

7. Multiplexer (MUX)/Demultiplexer (DEMUX): different multiplexing techniques employ different multiplexers/demultiplexers. The wavelength division multiplexing technology is a technology of combining a plurality of modulated optical signals (optical signals for short, carrying useful information, such as uplink/downlink information) with each other at a transmitting end via a multiplexer (such as a multiplexer) and sending the combined optical signals into the same optical fiber of an optical line (i.e., an optical fiber transmission link) for transmission, and separately receiving optical signals with different wavelengths at a receiving end via a demultiplexer (such as a demultiplexer).

8. The wave separator/wave combiner is a multiplexer/demultiplexer adopted by the wave division multiplexing technology. The combiner comprises a plurality of input ends and an output end, wherein each input end of the plurality of input ends is used for inputting optical signals with a certain wavelength, the wavelengths of the optical signals input by different input ends are usually different, the combiner is used for combining the optical signals input by the plurality of input ends, namely combining the optical signals into one optical signal (called a composite optical signal), and the composite optical signal comprises a plurality of optical signals, wherein the optical signals respectively correspond to different wavelengths. The demultiplexer is arranged opposite to the multiplexer. The demultiplexer comprises an input end and a plurality of output ends, wherein the input end is used for inputting a composite optical signal, the composite optical signal comprises a plurality of optical signals, and the optical signals respectively correspond to different wavelengths. The demultiplexer is configured to demultiplex, that is, decompose, the composite optical signal into a plurality of optical signals, so that a device to which the demultiplexer belongs receives the plurality of optical signals. Wherein each output end of the demultiplexer is used for outputting an optical signal with a certain wavelength, and the wavelengths of the optical signals output by different output ends are generally different.

It should be noted that each input of the combiner is used for inputting an optical signal of a fixed wavelength, and each output of the demultiplexer is used for outputting an optical signal of a fixed wavelength. If an optical signal of another wavelength is input to one of the input terminals of the combiner, the optical signal cannot be processed correctly, and thus cannot be transmitted further. If the optical signal input by the demultiplexer does not include an optical signal corresponding to a certain output end, the output end will not output any optical signal.

9. An Optical Splitter (OS), also called splitter/Optical Coupler (OC), is different from the design and function of a splitter/combiner. The optical splitter includes an input end and a plurality of output ends, and the input end of the optical splitter is used for inputting an optical signal, and the optical signal can be an optical signal including one wavelength (i.e. a single-wavelength optical signal) or a wavelength division multiplexing optical signal (i.e. a composite optical signal). The optical splitter is configured to split an input optical signal to obtain a plurality of optical signals, where the plurality of optical signals include the same wavelength, for example, the plurality of optical signals may have substantially the same energy by splitting the optical signals according to the energy. The plurality of output terminals of the optical splitter output one optical signal, respectively, so that the plurality of optical signals are output through the plurality of output terminals. The optical signal obtained by the light splitting has the same wavelength characteristics as the optical signal before the light splitting. For example, if the optical signal input by the optical splitter is a single-wavelength optical signal, the plurality of optical signals obtained after the optical splitting are also single-wavelength optical signals, and the wavelength of each of the plurality of optical signals is the same as the wavelength of the optical signal input by the optical splitter. If the optical signal inputted from the optical splitter is a composite optical signal, each of the plurality of optical signals obtained after the optical splitting is also a composite optical signal.

The optical coupler comprises a plurality of input ends and an output end, wherein each input end of the plurality of input ends can input optical signals with any wavelength, and the optical coupler is used for coupling the optical signals input by the plurality of input ends so as to obtain an optical signal, and the corresponding wavelength of the optical signal comprises all wavelengths of the optical signals input by the plurality of input ends. In some embodiments, the optical splitter and the optical coupler are the same device, and are given different names due to their different roles in different scenarios.

10. The optical splitter is a filter device, and when a plurality of optical signals with a certain wavelength difference are input into the optical splitter, the optical splitter can filter the input optical signals according to the wavelength, so that the optical signals with different wavelengths can be separated. For example, the beam splitter may filter out an input optical signal of a certain wavelength and transmit it in a certain direction (reflection/refraction), and filter out an input optical signal of another wavelength and transmit it in another direction (reflection/refraction).

In the embodiment of the application, the optical splitter is used for separating an uplink optical signal from a downlink optical signal, wherein a certain difference exists between an uplink wavelength corresponding to the uplink optical signal and a downlink wavelength corresponding to the downlink optical signal. For example, the composite uplink optical signal received by the downlink interface of the central optical module may be input to the optical splitter in the central optical module, and the composite downlink optical signal output by the multiplexer in the central optical module may also be input to the optical splitter in the central optical module, where a certain gap exists between the uplink wavelength corresponding to the composite uplink optical signal and the downlink wavelength corresponding to the composite downlink optical signal, so that the optical splitter can separate the input composite uplink optical signal and the composite downlink optical signal, thereby outputting the composite downlink optical signal to the downlink interface of the central optical module, and outputting the composite uplink optical signal to the demultiplexer in the central optical module.

In the embodiment of the application, in order to facilitate distinguishing, a plurality of devices belonging to the same class can be distinguished by words such as "first", "second", "third", and the like, and similarly, input ends/output ends of different devices can be distinguished by words such as "first", "second", "third", and the like.

The following is a description of the background of the embodiments of the present application.

Embodiments of the present application are designed for park network architecture evolution, but are not limited to application to park networks. The need for this solution is triggered by the evolution of the campus network towards the all-optical campus, so embodiments of the present application will be described in terms of evolution of the campus architecture and the route the solution thinks.

First, the architecture of the conventional campus network, the driving factors for the evolution of the campus network architecture, and the direction of the evolution are introduced.

In a traditional campus network, the networking structure is mainly tree networking, and in the tree architecture, three-layer networking is the most typical. The three layers are an access layer, a convergence layer and a core layer respectively, wherein the access layer directly pulls a network cable to network equipment (also called user equipment such as personal computers (personal computer, PC)/WIFI equipment and the like) in a traditional structure, and the convergence layer can finish data convergence in the north-south direction and exchange of data in the east-west direction. Wherein the access layers are interconnected downwards (i.e. towards the network device) mainly by means of network wires. The access layer to the convergence layer and the convergence layer to the core layer are typically interconnected by optical fibers. The connection mode between the layers is a point-to-point (P2P) mode, no convergence exists in both optical fibers and network cables, and the convergence and exchange of data are realized only at the switch.

The three-layer structure is slightly different in different types of parks, and specific positions are slightly different.

In a large campus, network construction is typically performed in building units. One core switching zone (i.e., core layer) is located throughout the campus. Each building can be built according to a two-layer tree structure, namely, each building is used as an independent convergence point. When the tree-type architecture is adopted in a large-scale park, data exchange in the same building can be completed in the building, and data exchange of different buildings is completed through a core layer.

The mid-size park generally adopts a two-layer structure, and can also adopt a three-layer structure according to the network scale and service requirements. When there are more network access points and multiple convergence points are needed, a three-layer structure can be adopted. For example, a newly built office building, a weak current room at each floor can be used as a convergence point, and the whole building adopts a three-layer structure and is provided with a core layer. When different service isolation requirements exist, such as the departments are isolated from each other, and an aggregation point is required to be set for each type of service or department independently, a three-layer structure can be adopted.

Having briefly described the traditional three-tier architecture of a campus network, the next generation of a campus architecture (i.e., an all-optical campus architecture) is described. The related art is mainly divided into two systems for searching an all-optical park at present, one is a passive optical access local area network (POL) scheme system based on PON technology, and the other is an all-optical ethernet scheme based on a conventional ethernet scheme.

The POL is a local area network based on PON technology, and provides fused data, voice, video and other weak current services for users through optical fibers. POL is a solution to apply access network PON technology directly to a campus. The application of POL in park network is described by taking the conventional three-layer network of park as an example, POL replaces two layers of access and convergence, an optical line terminal (optical line termination, OLT) device and a core layer switch are put together, and the P2MP connection is completed by adopting a passive device and an optical fiber in the middle. Compared with the traditional scheme, the POL can simplify the network architecture and realize that the three-layer network is changed into the two-layer network. Meanwhile, as the optical network units (optical network unit, ONU) of the OLT equipment and the user equipment are respectively arranged at two ends of the network, the full passive of the intermediate link can be realized, the maintenance quantity of the equipment is reduced, and the power consumption of the equipment is reduced. And the design of the P2MP can also greatly save the use of optical fibers, and simultaneously reduce the equipment deployment space.

With the application of PON technology in all-optical parks, the evolution of conventional ethernet in all-optical directions is triggered. The main problems encountered in traditional campus network schemes include no fiber drop-down to the room, multiple network levels, high numbers of fibers/wires, active devices on the interconnect links, etc. Aiming at the problems, the exploration of an Ethernet optical park is carried out.

In the optical fiber home scene, the box-type access switch is obtained after the switch at the user side is miniaturized and the functions are weakened, for example, a box-type access switch with 24 ports can be directly placed on the user desktop to form a desktop switch with 4 ports or 8 ports, so that the optical fiber is pulled straight.

From the foregoing, it can be seen that the embodiment of the present application is mainly applied to a wavelength division system, but in the current wavelength division scheme, the access side light module has not yet achieved normalization. For example, the laser in each access side light module can only emit an optical signal with a fixed uplink wavelength, the uplink wavelength corresponds to the access side light module, and uplink wavelengths corresponding to different access side light modules are different, so that wavelength division multiplexing is realized. For another example, each access side light module can only receive an optical signal with a fixed downlink wavelength, where the downlink wavelength corresponds to the access side light module, and downlink wavelengths corresponding to different access side light modules are different, so as to implement wavelength division multiplexing. It can be seen that the emission wavelength and the reception wavelength of the different access-side light modules in the group of access-side light modules connected with one intermediate are different, and normalization is not achieved. The embodiment of the application can normalize the color light hash optical module (namely the access side optical module) in the wavelength division system, thereby reducing the networking difficulty of optical communication and reducing the difficulty of equipment production, deployment, management and maintenance.

An environment in which embodiments of the present application are implemented will be described.

Fig. 1 is a schematic diagram of an optical communication system according to an embodiment of the present application. Referring to fig. 1, the system includes a central light module and a plurality of access-side light modules, the central light module being connected to the plurality of access-side light modules. Optionally, the optical communication system further includes an intermediate device, and the central optical module is connected to the plurality of access-side optical modules through the intermediate device. That is, the central optical module is connected with the intermediate device through optical fibers, and the intermediate device is also connected with the plurality of access side optical modules through optical fibers respectively.

The plurality of access side light modules in the optical communication system correspond to a plurality of uplink wavelengths, and the plurality of access side light modules correspond to a plurality of downlink wavelengths, wherein the downlink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and the uplink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different.

With continued reference to fig. 1, in an embodiment of the present application, the central optical module includes a fixed wavelength laser, where the fixed wavelength laser is configured to generate a plurality of optical signals with fixed wavelengths, and the plurality of fixed wavelengths includes a plurality of downlink wavelengths corresponding to the plurality of access-side optical modules.

Optionally, in one implementation, the fixed wavelength laser in the central optical module includes a plurality of lasers for generating the fixed wavelength optical signal, a wavelength of each of the plurality of lasers is not tunable, and different ones of the plurality of lasers correspond to different fixed wavelengths.

Each access side light module in the plurality of access side light modules comprises an adjustable wavelength laser, each access side light module can automatically set the emission wavelength of the adjustable wavelength laser included by the access side light module according to certain logic, and the set emission wavelength is the emission wavelength corresponding to the access side light module. There are a number of implementations of the emission wavelength setting "logic" herein, and embodiments of the present application are not limited in this regard.

With continued reference to fig. 1, the access-side light module is inserted or integrated into an access device for accessing the optical communication system through the access-side light module, thereby enabling communication with the routing switch device. Similarly, the central optical module is inserted into or integrated with the routing switch device, and the routing switch device is used for realizing communication with the access device through the central optical module. The optical module is inserted into the corresponding device in the present drawings. Accordingly, the optical signal of the downlink wavelength (abbreviated as downlink optical signal) carries downlink information sent by the routing switch device, and the optical signal of the uplink wavelength (abbreviated as uplink optical signal) carries uplink information sent by the access device. The downlink information comprises a downlink instruction and/or downlink data, and the uplink information comprises an uplink response and/or uplink data.

And a plurality of pairs of channels are arranged between the central optical module and the route switching equipment, the channels are realized by using deserializers (serdes), each serdes corresponds to one access side optical module, and the access side optical module is used for transmitting uplink and downlink information of the corresponding access side optical module. For example, n serdes are in one-to-one correspondence with n access-side light modules.

In an embodiment of the present application, the access device may be an "asteroid" switch, an Access Point (AP), or other device in the industry. An access device may also be referred to as a remote access device or an optical line terminal or other name. The routing switch device may be a switch, such as a local area network switch (local area network switch, LSW), or a router. The routing switch may also be referred to as a hub switch, core switch, or other name. The central optical module may also be referred to as a core side optical module or a local side optical module. The access side light module may also be referred to as a terminal light module, a remote light module, etc.

The central optical module and the access side optical module are used for transmitting uplink and downlink information between the route switching equipment and the access equipment according to the optical communication method provided by the embodiment of the application, and the uplink and downlink information is borne on the uplink and downlink optical signals. For example, the central optical module is configured to send a composite downlink optical signal to the multiple access side optical modules, where the composite downlink optical signal includes multiple downlink optical signals generated by a fixed wavelength laser of the central optical module, where wavelengths of the multiple downlink optical signals are multiple downlink wavelengths corresponding to the multiple access side optical modules, each of the multiple access side optical modules is configured to send an optical signal of an uplink wavelength corresponding to the access side optical module to the central optical module by using an adjustable wavelength laser, and the central optical module is further configured to receive a composite uplink optical signal, where the composite uplink optical signal includes multiple uplink optical signals, and wavelengths of the multiple uplink optical signals are multiple uplink wavelengths corresponding to the multiple access side optical modules.

In one implementation, the wavelength division interval of the plurality of downstream wavelengths is greater than the wavelength division interval of the plurality of upstream wavelengths. The relevant description of the wavelength division interval can be referred to the corresponding description above, and the detailed description is not repeated here.

In one possible implementation, the plurality of downstream optical signals included in the composite downstream optical signal are transmitted based on a Coarse Wavelength Division Multiplexing (CWDM) scheme, and the plurality of upstream optical signals included in the composite upstream optical signal are transmitted based on a Dense Wavelength Division Multiplexing (DWDM) scheme. The description of CWDM and DWDM is referred to above and will not be repeated here.

In one possible implementation, the wavelength division intervals of the plurality of downlink wavelengths are greater than or equal to a first threshold, and the wavelength division intervals of the plurality of uplink wavelengths are less than a second threshold. That is, the plurality of downstream wavelengths and the plurality of upstream wavelengths may be designed according to the first threshold and the second threshold.

In one possible implementation, the first threshold is greater than the second threshold, and in another possible implementation, the first threshold may be equal to the second threshold. In the implementation mode that the first threshold value and the second threshold value are equal, one threshold value is set, and it is needless to say that two threshold values with equal values are set as the first threshold value and the second threshold value respectively.

As an example, the first threshold is 20nm and the second threshold is 2.5nm. The first threshold and the second threshold may be flexibly set according to practical situations, which is not limited in the embodiment of the present application. The setting factor of the second threshold may include a hardware implementation situation of the current laser, for example, according to the feasibility of hardware implementation of the current tunable wavelength laser, the second threshold may be set to 2.5nm, based on which, the wavelength division intervals of the plurality of uplink wavelengths may be less than 2.5nm, for example, may be 2.4nm. Tunable wavelength lasers can be difficult to implement if the wavelength division separation of the multiple upstream wavelengths exceeds 2.5nm.

It should be understood that 2.5nm may be a limit value for the feasibility of the present hardware implementation, but does not represent 2.5nm or later, that is, as the laser related technology advances, the limit value may be broken through, and the wavelength division interval of the multiple uplink optical signals that can be generated by the tunable wavelength laser may be greater than 2.5nm.

In some embodiments, if the wavelength division interval of the plurality of uplink wavelengths is less than 2.3nm, a demultiplexer (which will be described later) in the central optical module may use an array dictorial advisor grating (arrayed waveguide grating, AWG) or a silicon optical Mach-Zehnder (MZ) demultiplexing scheme. If the wavelength division interval of the plurality of uplink wavelengths is greater than 2.3nm, the demultiplexer in the central optical module may employ a demultiplexing scheme of a free space (FREE SPACE) thin film filter (THIN FILM FILTER, TFF).

In order to implement the optical communication method provided by the embodiment of the present application, the embodiment of the present application provides specific implementation manners of multiple optical communication systems, and the specific implementation manners will be described with reference to fig. 2 to 9.

Fig. 2 is a schematic diagram of another optical communication system according to an embodiment of the present application. Referring to fig. 2, in an embodiment of the present application, a fixed wavelength laser in a central optical module includes a plurality of Laser Diodes (LDs), one LD being a laser, each LD of the plurality of LDs being configured to generate an optical signal of a fixed wavelength, the wavelength of each LD of the plurality of LDs being non-tunable, different LDs of the plurality of LDs corresponding to different fixed wavelengths. Each LD is configured to emit an optical signal of a fixed wavelength based on the received electrical signal, the wavelengths of the optical signals emitted by the different LD being different.

In the embodiment of the application, the fixed wavelength laser in the central optical module is used for generating a plurality of downlink optical signals according to a plurality of first electrical signals input by the routing exchange equipment, the plurality of downlink optical signals bear downlink information sent by the routing exchange equipment through the plurality of first electrical signals, the plurality of first electrical signals are in one-to-one correspondence with the plurality of access side optical modules, and the downlink information borne by the plurality of first electrical signals comprises information sent to the plurality of access side optical modules.

As an example, the fixed wavelength laser in the central optical module includes a plurality of LDs in the central optical module shown in fig. 2, the plurality of LDs being in one-to-one correspondence with a plurality of first electrical signals input by the routing switch device, each LD in the plurality of LDs being configured to generate one downstream optical signal according to a corresponding one of the first electrical signals.

In the embodiment of the application, the central optical module further comprises a photoelectric conversion device, the photoelectric conversion device is used for receiving a plurality of uplink optical signals, performing photoelectric conversion on the plurality of uplink optical signals to obtain a plurality of second electrical signals, outputting the plurality of second electrical signals to the routing exchange equipment, wherein the plurality of uplink optical signals are in one-to-one correspondence with the plurality of access side optical modules, and the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules.

As an example, the photoelectric conversion device in the center optical module includes Photodiodes (PDs) (illustrated as n) in the center optical module shown in fig. 2, different PDs of the plurality of PDs are configured to receive optical signals of different uplink wavelengths, each PD of the plurality of PDs is configured to receive one of the plurality of uplink optical signals, and each PD is configured to photoelectrically convert the received uplink optical signal to obtain a second electrical signal, and output the photoelectrically converted second electrical signal to the routing switch device.

It should be understood that, in the drawing, a plurality of LDs, such as LD1, LD2, LD3, and LDn, are drawn in one frame, and do not indicate that physical positions of LD1, LD2, LD3, and LDn must be together, and, in the same way, a plurality of PDs, such as PD1, PD2, PD3, and PDn, are drawn in one frame, and do not indicate that physical positions of PD1, PD2, PD3, and PDn must be together. The physical location of these devices may be set according to the actual situation, which is not limited by the embodiment of the present application. For example, LD1 and PD1 may be provided together, LD2 and PD2 may be provided together, and LD3 and PD3 may be provided together. The same holds true for the similar parts in the drawings of the subsequent embodiments, which will not be explained again later.

In the embodiment of the present application, the central optical module includes a plurality of LDs and a plurality of PDs in one-to-one correspondence, and in some implementations, one LD and one PD having a correspondence relationship may be integrated together, for example, on one device, which may be referred to as a photoelectric conversion sub-module, so that the central optical module includes a plurality of photoelectric conversion sub-modules, each of which includes one LD and one PD, and the plurality of photoelectric conversion sub-modules are in one-to-one correspondence with a plurality of serdes, and are used for transmitting uplink and downlink information corresponding to the plurality of serdes respectively.

In some embodiments, the device for performing photoelectric conversion in the central optical module may be collectively referred to as a photoelectric conversion device, where the photoelectric conversion device includes a plurality of PDs as described above, and optionally, the photoelectric conversion device may further include other components, such as a light barrel, a lens, and the like, which is not limited thereto. The device for emitting an optical signal in the central optical module may be collectively referred to as an electro-optical conversion device including the above-described plurality of LDs, and alternatively, the electro-optical conversion device may further include other components, which is not limited.

With continued reference to fig. 2, the central optical module may also include an Optical MUX (OMUX), which may be referred to simply as a multiplexer, in the central optical module and transmits to the intermediate device.

As shown in fig. 2, the central optical module further includes an OMUX, which is connected to each of the plurality of LDs and the plurality of PDs of the central optical module. The OMUX comprises a plurality of input ends and a plurality of output ends, wherein a part of the input ends of the plurality of input ends are connected with the plurality of LDs in a one-to-one correspondence manner, and a part of the output ends of the plurality of output ends are connected with the plurality of PDs in a one-to-one correspondence manner.

In the embodiment of the application, the intermediate device comprises a demultiplexer and an optical combiner, and the demultiplexer in the intermediate device may be referred to as a first demultiplexer in the system embodiment. The first demultiplexer is used for demultiplexing the composite downlink optical signals received through the optical fiber to obtain a plurality of downlink optical signals, and based on respective downlink wavelengths of the downlink optical signals obtained through demultiplexing, the corresponding downlink optical signals are sent to the plurality of access side optical modules through the optical fiber. The optical combiner is used for combining a plurality of uplink optical signals from the access side optical modules to obtain a combined uplink optical signal, and transmitting the combined uplink optical signal to the central optical module through the optical fiber.

The first demultiplexer may include a DEMUX in the intermediate device shown in fig. 2. The light combining means may comprise an optical coupler (coupler/splitter) in the intermediate device shown in fig. 2.

It should be understood that the intermediate device serves as a transmission medium for optical signals between the central optical module and the plurality of access-side optical modules, and is used for combining/coupling and splitting/decoupling the received optical signals, and does not perform information processing on the optical signals.

In the embodiment of the application, the intermediate device further comprises at least one uplink interface and a plurality of downlink interfaces, the intermediate device is connected with the central optical module through optical fibers by the at least one uplink interface, and the intermediate device is respectively connected with the plurality of access side optical modules through optical fibers by the plurality of downlink interfaces. In short, the intermediate device is connected with the central light module through an uplink interface and connected with the access side light module through a downlink interface.

The intermediate device is configured to receive the composite downlink optical signal and send the composite uplink optical signal through the at least one uplink interface. The intermediate device is configured to send corresponding downlink optical signals to the plurality of access side optical modules through the plurality of downlink interfaces, where each downlink interface in the plurality of downlink interfaces sends a downlink optical signal, and downlink wavelengths of optical signals sent by different downlink interfaces in the plurality of downlink interfaces are different. The intermediate device is further configured to receive, through the plurality of downlink interfaces, corresponding uplink optical signals sent by the plurality of access side optical modules, where each downlink interface in the plurality of downlink interfaces receives an uplink optical signal, and uplink wavelengths of optical signals received by different downlink interfaces in the plurality of downlink interfaces are different.

In the embodiment of the application, each access side light module comprises a photoelectric converter besides the adjustable wavelength laser, the photoelectric converter has the capability of processing optical signals with different downlink wavelengths, and the wavelength of the optical signals which can be processed by the photoelectric converter comprises a plurality of downlink wavelengths corresponding to the access side light modules, namely the photoelectric converter is a device for receiving broadband. In practical applications, each photoelectric converter is configured to photoelectrically convert an optical signal of a downlink wavelength received by an access side optical module to which the present photoelectric converter belongs to obtain an electrical signal (in some embodiments, referred to as a fourth electrical signal), and output the electrical signal (such as the fourth electrical signal) to an access device. The photoelectric converter in the access-side light module may include a PD in the access-side light module shown in fig. 2.

The adjustable wavelength laser in each access side light module has the capability of emitting optical signals with different uplink wavelengths, and the wavelength of the optical signals which can be emitted by the adjustable wavelength laser comprises a plurality of uplink wavelengths corresponding to the access side light modules, namely the emission wavelength of the laser in the access side light module is adjustable, so that the adjustable wavelength laser is called as an adjustable wavelength laser. The adjustable wavelength laser in the access side light module is used for generating optical signals corresponding to uplink wavelengths according to the electrical signals input by the corresponding access equipment, and the electrical signals input by the access equipment bear the uplink information sent by the access equipment. Taking the first optical module of the plurality of access side optical modules as an example, the first optical module is configured to receive a second electrical signal transmitted by the first access device, where the second electrical signal carries uplink information sent by the first access device, and the adjustable wavelength laser in the first optical module is configured to generate an optical signal (simply referred to as an uplink optical signal) of an uplink wavelength corresponding to the first optical module according to the second electrical signal, and send the uplink optical signal to the central optical module. Wherein the first access device is an access device in which the first optical module is integrated or plugged. The tunable wavelength laser in the access-side light module includes, for example, a Tunable Laser Diode (TLD) in the access-side light module shown in fig. 2.

As an example, the tunable wavelength laser in each access-side optical module may implement the adjustment of the emission wavelength using a DBR laser, an EA-modulated DBR laser, a Littman structure TECDL, littman-Metcalf structure TECDL, an FBG-TECDL, an MRR tunable laser, a fully integrated tunable laser based on an on-chip SOA, a FP laser, a DFB laser array, or a TOSA self-locking or injection locking manner. The photoelectric converter in each access side light module can adopt PIN, APD or SOA-PIN to realize photoelectric conversion.

In the embodiment of the application, the intermediate equipment and the central optical module can be connected by single fiber or double fiber, and the intermediate equipment and the access side optical module can be connected by single fiber or double fiber. Based on this, there are various implementations of the downstream interface and the upstream interface of the intermediate device, and the upstream interface of the access side light module. This will be described next.

First, a specific implementation manner of an upstream interface of the intermediate device and a downstream interface of the central optical module is described in the case of single-fiber connection between the central optical module and the intermediate device.

As shown in fig. 2, the intermediate device and the central optical module are connected by a single fiber, and therefore, the intermediate device and the central optical module further respectively include a light splitting sheet, the light splitting sheet in the intermediate device for connecting the central optical module may be referred to as a third light splitting sheet, and the light splitting sheet in the central optical module for connecting the intermediate device may be referred to as a fourth light splitting sheet. The fourth light splitting sheet is connected with the downlink interface of the central light module, and the fourth light splitting sheet is also connected with one input end and one output end of the OMUX respectively. The fourth light-splitting sheet is also connected with the third light-splitting sheet through an optical fiber, and the optical fiber is called a fourth optical fiber for the convenience of distinguishing.

Under the condition of single-fiber connection between the central optical module and the intermediate equipment, the central optical module comprises a downlink interface, and the downlink interface of the central optical module is connected with an optical fiber. In this case, there are various implementations of the optical multiplexer (i.e. OMUX) in the central optical module, which will be described separately below.

In a first implementation, the OMUX includes a device that has both branching and combining functions. That is, the OMUX of the central optical module includes a multiplexing demultiplexer having both functions of multiplexing and demultiplexing. The multiplexing demultiplexer is used for combining a plurality of downlink optical signals generated by the fixed wavelength laser into a composite downlink optical signal, and transmitting the composite downlink optical signal to the fourth optical splitter. The fourth optical splitter is used for transmitting the composite downlink optical signal through the downlink interface of the central optical module, receiving the composite uplink optical signal transmitted on the connected optical fiber from the downlink interface of the central optical module, and transmitting the composite uplink optical signal to the multiplexing demultiplexer. The multiplexing and demultiplexing device is also used for receiving the composite uplink optical signal transmitted by the fourth optical splitter, demultiplexing a plurality of uplink optical signals from the composite uplink optical signal, and transmitting the demultiplexed plurality of uplink optical signals to the photoelectric conversion device.

As an example, the OMUX shown in fig. 2 may be configured as a MUX that acts as a multiplexing demultiplexer. In this implementation, the wavelength band of the MUX is broad, i.e., the MUX includes both downstream and upstream wavelengths.

In a second implementation manner, the OMUX of the central optical module may include two devices, which are a first multiplexer and a second demultiplexer, respectively, where the first multiplexer has a function of combining waves, and the second demultiplexer has a function of dividing waves. The fixed wavelength laser is used for generating a plurality of downlink optical signals according to a plurality of first electrical signals, and transmitting the plurality of downlink optical signals to the first multiplexer, wherein the plurality of first electrical signals are electrical signals input by the routing switching equipment. The first multiplexer is used for combining the plurality of downlink optical signals into a composite downlink optical signal and transmitting the composite downlink optical signal to the fourth optical splitter. The fourth optical splitter is used for transmitting the composite downlink optical signal through the downlink interface of the central optical module, receiving the composite uplink optical signal transmitted on the connected optical fiber from the downlink interface of the central optical module, and transmitting the composite uplink optical signal to the second demultiplexer. The second demultiplexer is configured to receive the composite uplink optical signal transmitted by the fourth optical splitter, demultiplex a plurality of uplink optical signals from the composite uplink optical signal, and transmit the demultiplexed plurality of uplink optical signals to the photoelectric conversion device. The photoelectric conversion device is used for converting the plurality of uplink optical signals demultiplexed by the second demultiplexer into a plurality of second electrical signals and outputting the plurality of second electrical signals to the routing switch equipment.

As an example, referring to fig. 3, the OMUX in the central optical module may be implemented by one multiplexer (illustrated as a MUX, as a first multiplexer) and one demultiplexer (illustrated as a DEMUX, as a second demultiplexer), the multiple inputs of which are connected in one-to-one correspondence with the multiple LDs of the central optical module, and the multiple outputs of which are connected in one-to-one correspondence with the multiple PDs of the central optical module. The fourth beam splitter is connected with the input end of the beam splitter and the output end of the beam combiner.

That is, in the implementation manner shown in fig. 3, the OMUX includes two devices, one is a MUX, and the other is a DEMUX, and the two devices respectively process an uplink optical signal (implementing a branching function) and a downlink optical signal (implementing a combining function), so that the two devices have narrower wave bands and are easy to implement, where the wave band of the MUX only needs to include a plurality of downlink wavelengths, and the wave band of the DEMUX only needs to include a plurality of uplink wavelengths.

In addition to the two implementations, in other implementations, the OMUX may have the functions of the fourth beam splitter in addition to the functions of beam splitting and beam combining. That is, the functionality of the fourth beam splitter is integrated in the OMUX.

In one possible implementation, the central optical module may include a multiplexing demultiplexer, rather than a fourth beam splitter. The multiplexing demultiplexer is connected with the downlink interface of the central optical module. The fixed wavelength laser is used for generating a plurality of downlink optical signals according to a plurality of first electrical signals, and transmitting the plurality of downlink optical signals to the multiplexing and demultiplexing device, wherein the plurality of first electrical signals are electrical signals input by the routing switching device. The multiplexing demultiplexer is used for combining the plurality of downlink optical signals into a composite downlink optical signal, sending the composite downlink optical signal through a downlink interface of the central optical module, receiving a composite uplink optical signal transmitted on an optical fiber connected with the downlink interface of the central optical module, demultiplexing the plurality of uplink optical signals from the composite uplink optical signal, and transmitting the plurality of uplink optical signals to the photoelectric conversion device. The photoelectric conversion device is used for converting the plurality of uplink optical signals demultiplexed by the multiplexing demultiplexer into a plurality of second electrical signals and outputting the plurality of second electrical signals to the routing switch equipment. That is, the multiplexing/demultiplexing device has the functions of both branching, multiplexing and splitting.

As an example, referring to fig. 4, the OMUX in the central optical module may be implemented by a MUX (as a multiplexing demultiplexer) that has the functions of both multiplexing, demultiplexing and splitting, and the MUX adds an optical splitting interface, which is directly connected to the third splitting slice of the intermediate device through an optical fiber, compared to the MUX in the first implementation. That is, the optical splitter in the central optical module shown in fig. 2 is integrated in the OMUX shown in fig. 2, and the central optical module shown in fig. 4 can be obtained.

In another possible implementation, the central optical module may include the second multiplexer and the third demultiplexer, without including the fourth beam splitter. The second multiplexer is connected with the downlink interface of the central optical module, and the second multiplexer is also connected with the third demultiplexer. The fixed wavelength laser is used for generating a plurality of downlink optical signals according to a plurality of first electrical signals, and transmitting the plurality of downlink optical signals to the second multiplexer, wherein the plurality of first electrical signals are electrical signals input by the routing switching equipment. The second multiplexer is used for combining the plurality of downlink optical signals into a composite downlink optical signal, sending the composite downlink optical signal through a downlink interface of the central optical module, receiving the composite uplink optical signal transmitted on an optical fiber connected with the downlink interface of the central optical module, and transmitting the composite uplink optical signal to the third demultiplexer. The third demultiplexer is configured to receive the composite uplink optical signal transmitted by the second demultiplexer, demultiplex a plurality of uplink optical signals from the composite uplink optical signal, and transmit the plurality of uplink optical signals to the photoelectric conversion device. The photoelectric conversion device is used for converting the plurality of uplink optical signals demultiplexed by the third demultiplexer into a plurality of second electrical signals and outputting the plurality of second electrical signals to the routing switch device. That is, the second multiplexer has the functions of combining and splitting, and the third demultiplexer has the function of splitting.

As an example, referring to fig. 5, the OMUX in the central optical module may be implemented by a MUX (as a second multiplexer) and a DEMUX (as a third demultiplexer), where the MUX is further added with a drop port compared to the second implementation described above, where the drop port is directly connected to the third drop slice of the intermediate device through an optical fiber, and is also connected to the DEMUX. That is, the center optical module shown in fig. 5 can be obtained by integrating the optical splitter in the center optical module shown in fig. 3 in the MUX shown in fig. 3.

The above-mentioned implementations actually provide several design manners of the functions of wave division, wave combination and light division on hardware, and the hardware design manners are different, but all the hardware design manners can achieve basically the same technical effect. The OMUX in the central optical module will be described hereinafter by taking a MUX, a DEMUX and a beam splitter as examples.

Under the condition of single-fiber connection between the central optical module and the intermediate equipment, the intermediate equipment further comprises an uplink interface and a third light splitting sheet, the uplink interface of the intermediate equipment is connected with the downlink interface of the central optical module through an optical fiber, and the third light splitting sheet is respectively connected with the uplink interface of the intermediate equipment, the first demultiplexer and the light combining device. The third optical splitter is configured to receive, through an uplink interface of the intermediate device, the composite downlink optical signal sent by the central optical module, and transmit the composite downlink optical signal to the first demultiplexer. The third light splitting sheet is also used for receiving the composite uplink optical signal transmitted by the light combining device and transmitting the composite uplink optical signal to the central optical module through an uplink interface of the intermediate equipment.

As an example, the optical splitter in the intermediate device shown in fig. 2 to 5 is a third optical splitter, and the uplink interface connected to the third optical splitter is the uplink interface of the intermediate device.

Various implementations of the single-fiber connection between the central optical module and the intermediate device are described above in connection with fig. 2-5, and implementations of the dual-fiber connection between the intermediate device and the access-side optical module will be described below with continued reference to fig. 2-5.

That is, the following describes a specific implementation manner of the downstream interface of the intermediate device and the upstream interface of the access side light module in the case of a dual-fiber connection between the intermediate device and the access side light module.

Under the condition of double-fiber connection between the intermediate equipment and the access side light module, each of a plurality of downlink interfaces of the intermediate equipment comprises a first sub-interface and a second sub-interface, a first demultiplexer of the intermediate equipment is respectively connected with the plurality of first sub-interfaces of the plurality of downlink interfaces, a light combining device of the intermediate equipment is respectively connected with the plurality of second sub-interfaces of the plurality of downlink interfaces, and different access side light modules of the plurality of access side light modules are respectively connected with different downlink interfaces of the intermediate equipment through optical fibers. A first optical module in the plurality of access side optical modules is connected with a first sub-interface and a second sub-interface which are included in a first downlink interface in the plurality of downlink interfaces through different optical fibers respectively.

Based on the above, the first demultiplexer is specifically configured to transmit a plurality of downlink optical signals to the plurality of first sub-interfaces, where one first sub-interface receives one downlink optical signal, the downlink wavelengths of the optical signals received by different first sub-interfaces are different, the first sub-interface in the first downlink interface is configured to transmit the downlink optical signal received by the first sub-interface to the first optical module through the connected optical fiber, the second sub-interface in the first downlink interface is configured to receive the optical signal corresponding to the first optical module and transmitted by the first optical module through the connected optical fiber, the second sub-interface in the plurality of downlink interfaces is configured to transmit the optical signal of the uplink wavelength received by the second sub-interface to the optical combiner, where one optical signal received by the second sub-interface is referred to as one uplink optical signal, and the optical combiner is specifically configured to combine the plurality of uplink optical signals transmitted by the plurality of second sub-interfaces into a composite uplink optical signal.

The optical multiplexer comprises a plurality of downlink interfaces, a plurality of optical combining devices, a plurality of output ends of the first demultiplexer in the intermediate equipment, a plurality of first sub-interfaces, a plurality of input ends of the optical combining devices in the intermediate equipment, a plurality of second sub-interfaces and a plurality of first sub-interfaces, wherein the plurality of output ends of the first demultiplexer in the intermediate equipment are connected with the plurality of first sub-interfaces included in the plurality of downlink interfaces in a one-to-one correspondence manner. The plurality of output ends of the first demultiplexer are used for outputting a plurality of downlink optical signals, and different output ends output downlink optical signals with different downlink wavelengths. The multiple input ends of the optical combining device are used for inputting multiple uplink optical signals, and the different input ends are used for inputting uplink optical signals with different uplink wavelengths. In the case that the optical combiner is a multiplexer, each input end of the optical combiner allows the input of an optical signal with a fixed uplink wavelength and continues transmission, and if an optical signal with other wavelengths is input to a certain input end, the optical signal cannot continue transmission.

As an example, each of the plurality of downstream interfaces of the intermediate device shown in fig. 2 to 5 includes a pair of sub-interfaces, i.e., the first sub-interface and the second sub-interface above. The first sub-interface is used for transmitting downlink optical signals, and the second sub-interface is used for transmitting uplink optical signals. For simplicity, the first sub-interface and the second sub-interface are labeled at one downlink interface (for example, interface 1) of the intermediate device shown in fig. 2, while other downlink interfaces are not labeled, and are not labeled at the same place in other figures, and refer to fig. 2. For convenience of distinction, in the embodiment of the present application, the optical fiber connected to the first sub-interface may be referred to as a second optical fiber, and the optical fiber connected to the second sub-interface may be referred to as a third optical fiber. For example, the first optical module is connected with a first sub-interface included in the first downlink interface through a second optical fiber, and is connected with a second sub-interface included in the first downlink interface through a third optical fiber.

In the case of a dual fiber connection between the intermediate device and the access side light module, the first light module may include two upstream interfaces, which in some embodiments may be referred to as a first upstream interface and a second upstream interface for ease of distinction and description. The first uplink interface of the first optical module is connected with the first sub-interface included in the first downlink interface of the intermediate device through one optical fiber (second optical fiber), and the second uplink interface of the first optical module is connected with the second sub-interface included in the first downlink interface of the intermediate device through the other optical fiber (third optical fiber).

Under the condition that the first optical module comprises two uplink interfaces, a photoelectric converter in the first optical module can be connected with the first uplink interface of the first optical module, and the photoelectric converter is used for receiving downlink optical signals transmitted by the first uplink interface, performing photoelectric conversion on the downlink optical signals transmitted by the first uplink interface to obtain fourth electrical signals, and outputting the fourth electrical signals to the first access equipment. The downlink optical signal transmitted by the first uplink interface carries downlink information transmitted by the routing switch device to the first access device. The adjustable wavelength laser in the first optical module can be connected with the second uplink interface of the first optical module, and the adjustable wavelength laser is used for transmitting the generated uplink optical signal to the intermediate device through the second uplink interface. The wavelength-adjustable laser can generate an optical signal of an uplink wavelength corresponding to the access side optical module according to a third electrical signal input by the first access device. The optical signal generated by the wavelength-adjustable laser in the first optical module carries uplink information transmitted by the first access device to the routing switching device.

As an example, referring to fig. 2 to 5, the PD and LD in each access-side optical module are connected to different optical fibers through different uplink interfaces, respectively.

The central optical module and the intermediate device shown in fig. 2 to 5 are connected by a single fiber, the intermediate device and the access side optical module are connected by a double fiber, in other embodiments, the central optical module and the intermediate device may be connected by a double fiber, and the intermediate device and the access side optical module may be connected by a single fiber. That is, the connection mode between two devices in the optical communication system can be flexibly set according to the actual situation. Based on this, there are a number of variations of the optical communication systems shown in fig. 2 to 5. Three variations thereof will be described with reference to fig. 6 to 8.

In fig. 6, the central optical module and the intermediate device, and the intermediate device and the access side optical module are all connected by single fibers, and fig. 6 may be obtained by replacing the dual-fiber connection mode between the intermediate device and the access side optical module shown in fig. 3 with the single-fiber connection mode. In fig. 7, the central optical module and the intermediate device are connected by two fibers, and the intermediate device and the access side optical module are connected by a single fiber, and fig. 7 can be obtained by replacing the single fiber connection mode between the central optical module and the intermediate device shown in fig. 6 with the two fiber connection mode. In fig. 8, the central optical module and the intermediate device, and the intermediate device and the access side optical module are all connected by two fibers, and fig. 8 can be obtained by replacing the single-fiber connection mode between the central optical module and the intermediate device shown in fig. 3 with the two-fiber connection mode.

Next, in conjunction with fig. 6 and fig. 7, a specific implementation manner of the downstream interface of the intermediate device and the upstream interface of the access side light module in the case of a single fiber connection between the intermediate device and the access side light module will be described.

In the case of a single fiber connection between the intermediate device and the access side light module, referring to fig. 6 and 7, each of the plurality of downstream interfaces of the intermediate device connects one fiber. It should be understood that each downstream interface of the intermediate device is a physical interface, and each downstream interface is connected to an access side light module through an optical fiber.

In order to realize single-fiber connection between the intermediate equipment and the access side light module, in one implementation mode, the intermediate equipment further comprises a plurality of first light splitting pieces, a first demultiplexer in the intermediate equipment is connected with the plurality of first light splitting pieces respectively, a light combining device in the intermediate equipment is connected with the plurality of first light splitting pieces respectively, each first light splitting piece in the plurality of first light splitting pieces is connected with one downlink interface in a plurality of downlink interfaces of the intermediate equipment, different first light splitting pieces are connected with different downlink interfaces, each access side light module further comprises a second light splitting piece, the second light splitting piece is connected with one downlink interface of the intermediate equipment through an optical fiber, and the second light splitting piece in different access side light modules in the plurality of access side light modules is connected with different downlink interfaces of the intermediate equipment. Taking a first optical module (also referred to as a first access side optical module) of the plurality of access side optical modules as an example, a second dichroic sheet of the first optical module is connected to a first downlink interface of the plurality of downlink interfaces through a first optical fiber.

The optical multiplexer comprises a plurality of first optical splitter plates, a plurality of input ends of the optical combiner, a plurality of output ends of the first demultiplexer in the intermediate equipment are connected with the first optical splitter plates in a one-to-one correspondence mode, and a plurality of input ends of the optical combiner are connected with the first optical splitter plates in a one-to-one correspondence mode.

Based on the above, the first demultiplexer is specifically configured to transmit a downlink optical signal to each of the first optical splitters, where one first optical splitter receives a downlink optical signal, the downlink wavelengths of the optical signals received by the different first optical splitters are different, each first optical splitter is configured to transmit the downlink optical signal received by the first optical splitter to a downlink interface connected to the first optical splitter, the first downlink interface is configured to transmit, through a first optical fiber, the downlink optical signal received by the first downlink interface to a second optical splitter in the first optical module, the second optical splitter in the first optical module is configured to transmit, through the first optical fiber, the uplink optical signal corresponding to the first optical splitter to the first downlink interface, each downlink interface is further configured to transmit, to the first optical splitter connected to the first optical splitter, the uplink optical signal received by the first optical splitter, each first optical splitter is further configured to transmit, to the optical combiner, the uplink optical signal received by the first optical splitter, the first optical splitter is configured to transmit, through the first optical fiber, the downlink optical signal received by the first downlink interface, to the second optical splitter, the optical signal corresponding to the first optical splitter, and the second optical splitter is configured to transmit, through the first optical splitter, the uplink optical signal.

As an example, on the basis of fig. 3, a plurality of light splitting sheets (n in fig. 6) are added to the intermediate device as the plurality of first light splitting sheets, and one light splitting sheet is added to each access side light module as the plurality of second light splitting sheets, thereby obtaining the optical communication system shown in fig. 6. The light splitting sheet connected with the downlink interface of the intermediate device in the intermediate device shown in fig. 6 and fig. 7 is the first light splitting sheet described above, and the light splitting sheet in the access side light module shown in fig. 6 and fig. 7 is the second light splitting sheet described above.

In the case of a single fiber connection between the intermediate device and the access side light modules, each access side light module may include an upstream interface. Taking the first optical module as an example, the first optical module may include an uplink interface, where the uplink interface of the first optical module is connected to the first optical fiber, that is, the first optical fiber is connected to the first downlink interface of the intermediate device, and the second light splitting piece in the first optical module is connected to the uplink interface of the first optical module.

As an example, the optical fiber between the intermediate device and the access side optical module 1 (as the first optical module) shown in fig. 6 and 7 is the first optical fiber.

Optionally, in the case that the access-side light module includes the second light splitting piece, the second light splitting piece is connected to the photoelectric converter and the tunable wavelength laser in the access-side light module, respectively. In the downlink direction, the second light splitting piece receives the downlink optical signal transmitted by the first optical fiber through the uplink interface of the access side optical module, and transmits the downlink optical signal to the photoelectric converter. The photoelectric converter in the access side light module is used for carrying out photoelectric conversion on the downlink optical signals transmitted by the second beam splitter. In the uplink direction, correspondingly, the wavelength-adjustable laser in the access side light module is used for transmitting the generated uplink optical signal to the second light splitting piece, and the second light splitting piece is used for transmitting the uplink optical signal generated by the wavelength-adjustable laser to the first optical fiber through the uplink interface.

As an example, taking the access-side light module 1 (as the first light module) shown in fig. 6 and 7 as an example, the flow of processing of the light signal from the perspective of the access-side light module is illustrated. In the downstream direction, the upstream interface of the access side optical module 1 is configured to receive a downstream optical signal (with a wavelength of λ ₁) transmitted by the first optical fiber, and transmit the downstream optical signal to the second optical splitter, where the second optical splitter is configured to send the downstream optical signal to the PD in the access side optical module 1, and the PD is configured to perform photoelectric conversion on the received downstream optical signal to obtain a fourth electrical signal, and transmit the fourth electrical signal to the access device 1. In the upstream direction, the TLD in the access side optical module 1 is configured to receive the third electrical signal input by the access device 1, generate, according to the third electrical signal input by the access device 1, an optical signal (simply referred to as an upstream optical signal, with a wavelength of λ _n+1) of an upstream wavelength corresponding to the access side optical module 1, and transmit the upstream optical signal to the second optical splitter, where the second optical splitter is configured to send the upstream optical signal to the first optical fiber through an upstream interface of the access side optical module 1.

Finally, in connection with fig. 7 and fig. 8, a specific implementation manner of the downstream interface of the central optical module and the upstream interface of the intermediate device in the case of dual-fiber connection between the central optical module and the intermediate device is described.

Under the condition of double-fiber connection between the central optical module and the intermediate equipment, the central optical module can comprise a second downlink interface, a third downlink interface, a first multiplexer, a second demultiplexer and a photoelectric conversion device, wherein the first multiplexer is connected with the third downlink interface, and the second demultiplexer is connected with the third downlink interface. The fixed wavelength laser is used for generating a plurality of downlink optical signals according to a plurality of first electrical signals, and transmitting the plurality of downlink optical signals to the first multiplexer, wherein the plurality of first electrical signals are electrical signals input by the routing switching equipment. The first multiplexer is used for combining the plurality of downlink optical signals into a composite downlink optical signal, and transmitting the combined composite downlink optical signal through the second downlink interface. The second demultiplexer is configured to demultiplex a plurality of uplink optical signals from the composite uplink optical signal received by the third downlink interface, and transmit the plurality of uplink optical signals to the photoelectric conversion device. The photoelectric conversion device is used for converting the plurality of uplink optical signals into a plurality of second electrical signals and outputting the plurality of second electrical signals to the routing switch equipment.

Correspondingly, the intermediate device comprises two uplink interfaces, which are respectively called a first uplink interface and a second uplink interface. The first uplink interface is connected with a second downlink interface of the central optical module, and the second uplink interface is connected with a third downlink interface of the central optical module through optical fibers. The first demultiplexer of the intermediate device is configured to receive, through a first uplink interface, a composite downlink optical signal sent by the central optical module. And the optical combining device of the intermediate equipment is used for transmitting a combined uplink optical signal to the central optical module through the second uplink interface.

As an example, referring to fig. 7 to 8, the first multiplexer in the central optical module is a MUX, the second demultiplexer in the central optical module is a DEMUX, the first demultiplexer in the intermediate device is a DEMUX, and the optical combiner is an optical coupler. The MUX of the central optical module is connected with the DEMUX of the intermediate equipment through one optical fiber, and the DEMUX of the central optical module is connected with the optical coupler of the intermediate equipment through the other optical fiber.

The connection between the intermediate device and the access side light module and the connection between the intermediate device and the central light module are described above in connection with fig. 2 to 8. The central optical module shown in fig. 2 to 5 and the central optical module shown in fig. 9 are connected with the intermediate device through single fibers, the intermediate device is connected with the access side optical module through double fibers, the central optical module shown in fig. 6 is connected with the intermediate device through single fibers, the intermediate device is connected with the access side optical module through single fibers, the central optical module shown in fig. 7 is connected with the intermediate device through double fibers, the intermediate device is connected with the access side optical module through single fibers, the central optical module shown in fig. 8 is connected with the intermediate device through double fibers, and the intermediate device is connected with the access side optical module through double fibers. That is, the connection mode between the two devices can be flexibly set according to the actual situation. The relevant descriptions of the same parts in any two figures may be mutually applicable, and are not repeated herein.

It should be noted that, in the implementation manner that the central optical module and the intermediate device and the access side optical module are all single-fiber connection (as in the embodiment of fig. 6), the connection manner between the devices is simpler, the optical networking difficulty is lower, the optical fiber usage amount is less, and the optical fiber resource is saved.

It should be understood that in the optical communication systems shown in fig. 2 to 8, the optical combining devices in the intermediate devices are optical couplers, that is, the intermediate devices each use the optical couplers to combine the optical signals from the access side optical modules. In other embodiments, the optical combiner in the intermediate device may be a combiner, that is, the intermediate device may also use a combiner to combine the optical signals from the access-side optical modules. Based on this, the optical couplers in the intermediate devices shown in fig. 2 to 8 can be replaced by one combiner, so that another seven optical communication system architectures are obtained. For example, an optical communication system as shown in fig. 9 can be obtained by replacing the optical coupler in fig. 3 with a "combiner".

When the intermediate device adopts the optical coupler as an uplink light combining device, the cost of the intermediate device is low.

As can be seen in connection with fig. 2 to 9, after the various devices/means in the optical communication system are connected, the physical channels between the routing switch device and the various access devices are already established and can be used for transmitting optical signals. The routing switching device and each access device are provided with a physical channel group, and the physical channel group comprises a downlink channel and an uplink channel. In the case that each LD and PD in the central optical module on the routing switch device are configured, the transmitting wavelength of each LD is already fixed, and the receiving wavelength of each PD is also already fixed, so that the downstream wavelength corresponding to each downstream channel is fixed, and the upstream wavelength corresponding to each upstream channel is also fixed. Each downlink channel is used for transmitting optical signals with corresponding downlink wavelengths to corresponding access equipment, the access side optical module receives the optical signals with fixed downlink wavelengths, and the corresponding downlink wavelengths of different downlink channels are different, so that the downlink wavelengths received by different access side optical modules are also different. The access side light module on the access device transmits the optical signals with corresponding uplink wavelengths to the route switching device through the corresponding uplink channels, and the uplink wavelengths corresponding to the optical signals transmitted by different access devices should be different and should correspond to the corresponding uplink channels.

It should be understood that a downstream channel may include multiple devices and fibers in a connected relationship. For example, taking fig. 3 as an example, the components of a downlink channel include a downlink portion of a serdes, an electrical connection between the serdes and an LD of a central optical module, an optical path between the LD of the central optical module and a MUX of the central optical module, an optical fiber link between the MUX of the central optical module and a DEMUX of an intermediate device, a DEMUX of the intermediate device, an optical path between an output end of the DEMUX of the intermediate device and a downlink interface to which the DEMUX of the intermediate device is connected, an optical fiber link between the downlink interface of the intermediate device and a PD of an access side optical module, and an electrical connection between the PD of the access side optical module and the access device. In brief, a downstream path is all devices and links from one seders of the routing switch to the access device with which it has a connection.

Similarly, an upstream channel may include a plurality of devices and optical fibers in a connected relationship. For example, taking fig. 3 as an example, the components of an uplink channel include an electrical connection between an access device and an LD of an access-side optical module, an optical fiber link between the LD and a downstream interface of an intermediate device, an optical path between a downstream interface of an intermediate device and an optical coupler of an intermediate device, an optical fiber link between an optical coupler of an intermediate device to a DEMUX of a central optical module, an optical path between an output of the DEMUX of a central optical module and a PD of a central optical module, and an electrical connection between the PD and a serdes. In brief, an upstream channel is all devices and links between an access-side optical module and the servers of the central optical module in connection therewith.

In fig. 2 to 9, taking n access side optical modules as an example, n physical channel groups matched with the access side optical modules are taken as an example, correspondingly, the optical communication system is used for transmitting optical signals with n downlink wavelengths, and transmitting optical signals with n uplink wavelengths, wherein the n downlink wavelengths are respectively denoted as lambda ₁~λ_n, and the n uplink wavelengths are respectively denoted as lambda _n+1~λ_2n. The intermediate device comprises n downlink interfaces, which are denoted as interfaces 1-n. In fig. 2 to 5 and fig. 8 to 9, each of the interfaces 1 to n includes a first sub-interface and a second sub-interface, that is, each of the interfaces includes two physical interfaces, and in fig. 6 to 7, each of the interfaces 1 to n is a physical interface.

In summary, each access side light module in the embodiment of the present application may be connected to any one downstream interface of the intermediate device through an optical fiber, and different access side light modules are connected to different downstream interfaces on the intermediate device. That is, the plurality of access side light modules are "normalized" light modules, and can be mixed and inserted into the plurality of downlink interfaces of the intermediate device, without concern about the correspondence between the downlink interfaces, the access side light modules and uplink and downlink wavelengths.

It should be understood that, the system architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and are not limited to the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the system architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is equally applicable to similar technical problems.

The following describes an optical communication method provided by the embodiment of the present application. The optical communication method can be applied to any of the optical communication systems shown in fig. 2 to 9.

First, an optical communication method performed by the access side optical module is described.

Fig. 10 is a flowchart of an optical communication method according to an embodiment of the present application, where steps of the method are performed by a first optical module, and the first optical module is any one of a plurality of access-side optical modules included in an optical communication system. The plurality of access side light modules correspond to a plurality of uplink wavelengths and also correspond to a plurality of downlink wavelengths, downlink wavelengths corresponding to different access side light modules are different, uplink wavelengths corresponding to different access side light modules are also different, wavelength division intervals of the plurality of downlink wavelengths are larger than wavelength division intervals of the plurality of uplink wavelengths, and related description about the uplink and downlink wavelength division intervals can refer to the above system embodiment and will not be repeated here. Referring to fig. 10, the method includes the following steps.

Step 1001, receiving a downlink optical signal, where a wavelength of the downlink optical signal is a first downlink wavelength corresponding to the first optical module.

As can be seen from the above description of the optical communication system, in one implementation, as shown in fig. 6 and 7, the first optical module includes an upstream interface and a splitter plate, where the upstream interface is connected to an optical fiber, which may be referred to as a first optical fiber, and the splitter plate is connected to the upstream interface. That is, the first optical module is connected to the intermediate device through an optical fiber by a single fiber. In this case, the specific implementation manner of the first optical module for receiving the downlink optical signal is that the optical splitter of the first optical module receives the downlink optical signal transmitted by the first optical fiber through the uplink interface of the first optical module. After the light splitting sheet of the first optical module receives the downlink optical signal, the downlink optical signal is also transmitted to the photoelectric converter in the first optical module.

In another implementation, as shown in fig. 2 to 5, 8 and 9, the first optical module includes two uplink interfaces, which are respectively referred to as a first uplink interface and a second uplink interface in this embodiment, where the first uplink interface and the second uplink interface are respectively connected to different optical fibers. That is, the first optical module is connected to the intermediate device through two optical fibers. In this case, the specific implementation manner of the first optical module for receiving the downlink optical signal is that the first uplink interface of the first optical module receives the downlink optical signal transmitted on the optical fiber connected to the first uplink interface. The first uplink interface is also connected with the photoelectric converter of the first optical module, and the first uplink interface transmits the received downlink optical signal to the photoelectric converter.

In the embodiment of the application, the photoelectric converter in the first optical module has the capability of processing optical signals with different downlink wavelengths, and the photoelectric converter can perform photoelectric conversion on the received downlink optical signals, so that a first electric signal is obtained.

The first optical module is integrated or inserted into the first access device, the downlink optical signal received by the first optical module carries downlink information transmitted by the routing switch device to the first access device, and the photoelectric converter of the first optical module performs photoelectric conversion on the downlink optical signal, so that after a first electrical signal is obtained, the first electrical signal can be transmitted to the first access device, so that the first access device processes the downlink information carried by the first electrical signal.

Step 1002, generating and transmitting an uplink optical signal, where a wavelength of the uplink optical signal is a first uplink wavelength corresponding to the first optical module.

Wherein the first optical module comprises a tunable wavelength laser. In contrast to fixed wavelength lasers, the wavelength of the optical signal generated by a tunable wavelength laser is not fixed and unique, but rather is tunable within a range, in other words, the tunable wavelength laser has the ability to generate optical signals of different wavelengths. Based on the above, the specific implementation manner of generating and transmitting the uplink optical signal by the first optical module is that the wavelength-adjustable laser generates and transmits the uplink optical signal.

Before the wavelength-adjustable laser generates and transmits the uplink optical signal, the first optical module can also receive the second electrical signal transmitted by the first access device, and the uplink optical signal generated by the wavelength-adjustable laser carries uplink information transmitted by the first access device through the second electrical signal. Based on this, the tunable wavelength laser may generate the upstream optical signal based on the second electrical signal.

In the case where the first optical module includes an upstream interface and an optical splitter (as shown in fig. 6 and 7), the wavelength-adjustable laser may be connected to the optical splitter, and the wavelength-adjustable laser may transmit the upstream optical signal to the optical splitter, and the optical splitter may transmit, through the upstream interface of the first optical module, the upstream optical signal generated by the wavelength-adjustable laser to the first optical fiber.

In the case that the first optical module includes a first upstream interface and a second upstream interface (as shown in fig. 2 to 5, 8 and 9), the wavelength-adjustable laser may be connected to the second upstream interface, and the wavelength-adjustable laser may transmit an upstream optical signal generated by the wavelength-adjustable laser to the second upstream interface, where the second upstream interface transmits an upstream optical signal generated by the wavelength-adjustable laser through an optical fiber connected to the second upstream interface.

It should be understood that, the steps 1001 and 1002 may occur simultaneously or may not occur simultaneously, i.e. the transmission process of the uplink and downlink information is independent of each other, regardless of the sequence of the steps.

In summary, in the embodiment of the present application, the wavelength division interval of the plurality of downlink wavelengths is greater than the wavelength division interval of the plurality of uplink wavelengths, such as the downlink coarse wavelength division and the uplink dense wavelength division, so that the hybrid wavelength division scheme is adopted to ensure the reliability of optical communication, and meanwhile, the cost of equipment/devices in the optical communication system and the difficulty of production and deployment are considered.

Further, under the condition that the access side light module comprises the adjustable wavelength laser and uplink dense wavelength division is carried out, the normalization scheme of the access side light module can be enabled to be feasible, so that the production cost and the deployment difficulty of the access side light module are reduced, and the networking difficulty of optical communication is reduced.

Next, an optical communication method performed by the center optical module is described. It should be understood that the steps performed by the central optical module may be matched with the steps performed by the access side optical module above, so as to complete the transmission of uplink and downlink information between the routing switch device and the access device.

Fig. 11 is a flowchart of another optical communication method according to an embodiment of the present application, where the method is applied to a central optical module in an optical communication system, and the optical communication system further includes a plurality of access side optical modules, where the plurality of access side optical modules correspond to a plurality of uplink wavelengths, and the plurality of access side optical modules correspond to a plurality of downlink wavelengths, where downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, and where uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, where the central optical module includes a fixed wavelength laser, where the fixed wavelength laser is configured to generate optical signals with a plurality of fixed wavelengths, and where the plurality of fixed wavelengths includes the plurality of downlink wavelengths. The wavelength division intervals of the plurality of downlink wavelengths are larger than those of the plurality of uplink wavelengths, and the description of the fixed wavelength laser and the uplink/downlink wavelength division intervals can refer to the above system embodiment, which is not repeated here. Referring to fig. 11, the method includes the following steps.

Step 1101, transmitting a plurality of downlink optical signals, wherein the plurality of downlink optical signals are generated by a fixed wavelength laser of the central optical module, and the wavelengths of the plurality of downlink optical signals are respectively a plurality of downlink wavelengths corresponding to the plurality of access side optical modules.

In the embodiment of the application, the central optical module is integrated or inserted into the routing and switching equipment, and the fixed wavelength laser in the central optical module can generate a plurality of downlink optical signals according to a plurality of first electrical signals input by the routing and switching equipment, wherein the plurality of downlink optical signals bear downlink information sent by the routing and switching equipment through the plurality of first electrical signals, the plurality of first electrical signals are in one-to-one correspondence with the plurality of access side optical modules, and the downlink information borne by the plurality of first electrical signals comprises information sent to the plurality of access side optical modules. Reference may be made to the above system embodiments for a description of fixed wavelength lasers, which are not repeated here.

The central optical module further comprises a multiplexer and at least one downlink interface, and the downlink interface of the central optical module is connected with the optical fiber. The implementation of step 1101 may include a multiplexer in the central optical module combining the plurality of downstream optical signals generated by the fixed wavelength laser into a composite downstream optical signal and transmitting the composite downstream optical signal through a downstream interface of the central optical module.

The multiplexer in the central optical module may be an OMUX in fig. 2 or a MUX in the central optical module shown in fig. 3 to 9.

In one possible implementation, the central optical module includes a multiplexer (which may be referred to as a multiplexing demultiplexer in some embodiments), a beam splitter, and a downstream interface, where the central optical module may be a central optical module obtained by setting the OMUX shown in fig. 2 as a MUX (with both a multiplexing function and a beam-splitting function), and the beam splitter of the central optical module is connected to the multiplexer and also connected to the downstream interface of the central optical module. Based on this, the multiplexer combines the plurality of downstream optical signals into a composite downstream optical signal, and then transmits the composite downstream optical signal to the optical splitter, which transmits the composite downstream optical signal to the downstream interface.

The central optical module comprises a multiplexer, a demultiplexer, a downlink interface and a light splitting sheet (shown in fig. 3, 6 and 9), wherein the light splitting sheet is respectively connected with the multiplexer and the demultiplexer of the central optical module, and the light splitting sheet is also connected with the downlink interface. Based on this, the multiplexer combines the plurality of downstream optical signals into a composite downstream optical signal, and then transmits the composite downstream optical signal to the optical splitter, which transmits the composite downstream optical signal to the downstream interface.

In another possible implementation, the central optical module includes a multiplexer, a demultiplexer, and a downstream interface (as shown in fig. 5), where the multiplexer is connected to the demultiplexer, and the multiplexer is further connected to the downstream interface. Based on this, the multiplexer combines the plurality of downstream optical signals into a composite downstream optical signal, and then transmits the composite downstream optical signal to the downstream interface.

In yet another possible implementation, the central optical module includes a multiplexer and a downstream interface (as shown in fig. 4) to which the multiplexer is connected. Based on this, the multiplexer combines the plurality of downstream optical signals into a composite downstream optical signal, and then transmits the composite downstream optical signal to the downstream interface. In some embodiments, the multiplexer may also be referred to as a multiplexing demultiplexer.

In yet another possible implementation, the central optical module includes a multiplexer, a demultiplexer, and two downstream interfaces (as shown in fig. 7 and 8), which may be referred to as a first downstream interface and a second downstream interface of the central optical module, the multiplexer being connected to the first downstream interface, the demultiplexer being connected to the second downstream interface, and the first downstream interface and the second downstream interface being connected to different optical fibers, respectively. Based on this, the multiplexer, after combining the plurality of downstream optical signals into a composite downstream optical signal, transmits the composite downstream optical signal through the connected first downstream interface.

Step 1102, receiving a plurality of uplink optical signals, where the wavelengths of the plurality of uplink optical signals are a plurality of uplink wavelengths corresponding to a plurality of access side optical modules, respectively.

The plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the route switching equipment.

In one possible implementation, the central optical module includes a demultiplexer and at least one downlink interface, where the central optical module may receive the composite uplink optical signal through the downlink interface, and the demultiplexer may demultiplex a plurality of uplink optical signals from the composite uplink optical signal, thereby receiving the plurality of uplink optical signals.

In the case that the central optical module includes a multiplexer, a demultiplexer, a downstream interface, and a light splitting sheet (as shown in fig. 3, 6, and 9), the light splitting sheet receives, through the downstream interface, a composite upstream optical signal transmitted on an optical fiber connected to the downstream interface, and transmits the composite upstream optical signal to the demultiplexer.

In the case that the central optical module includes a downstream interface, a multiplexer and a demultiplexer (as shown in fig. 5), the central optical module receives the composite upstream optical signal through the downstream interface, and the composite upstream optical signal received by the downstream interface is transmitted to the multiplexer, that is, the multiplexer receives the composite upstream optical signal transmitted on the connected optical fiber through the downstream interface, and then the multiplexer transmits the composite upstream optical signal to the demultiplexer.

In the case that the central optical module includes a multiplexer, a demultiplexer, a first downlink interface and a second downlink interface (as shown in fig. 7 and 8), the central optical module receives the composite uplink optical signal through the second downlink interface, and the composite uplink optical signal received by the second downlink interface is transmitted to the demultiplexer, that is, the demultiplexer receives the composite uplink optical signal through the connected second downlink interface.

In another possible implementation, the central optical module includes a downstream interface and a multiplexer (also referred to as a multiplexing demultiplexer) (as shown in fig. 4), where the central optical module receives a composite upstream optical signal through the downstream interface, and the composite upstream optical signal received by the downstream interface is transmitted to the multiplexer, that is, the multiplexer receives the composite upstream optical signal transmitted on the connected optical fiber through the downstream interface, and then the multiplexer demultiplexes multiple upstream optical signals from the composite upstream optical signal.

In yet another possible implementation, the central optical module includes a multiplexing demultiplexer, a beam splitter, and a downstream interface (such as OMUX shown in fig. 2 is set as MUX (both with multiplexing and beam splitting functions)), through which the central optical module receives the composite upstream optical signal, the downstream interface transmits the composite upstream optical signal to the beam splitter, the beam splitter transmits the composite upstream optical signal to the multiplexing demultiplexer, and then the multiplexing demultiplexer outputs a plurality of upstream optical signals from the demultiplexer in the composite upstream optical signal.

In the embodiment of the application, the central optical module further comprises a photoelectric conversion device, the central optical module demultiplexes a plurality of uplink optical signals through the multiplexer/demultiplexer, the plurality of uplink optical signals are transmitted to the photoelectric conversion device of the central optical module, the photoelectric conversion device performs photoelectric conversion on the plurality of uplink optical signals respectively, so that a plurality of second electrical signals are obtained, and the plurality of second electrical signals are sent to the routing exchange equipment.

It should be understood that, the steps 1101 and 1102 may occur simultaneously or may not occur simultaneously, i.e. the transmission processes of the uplink and downlink information are independent of each other.

Next, an optical communication method performed by the intermediate device is described. It should be understood that the steps performed by the intermediate device may be matched with the steps performed by the access side light module and the central light module, thereby completing the transmission of uplink and downlink information between the route switching device and the access device.

Fig. 12 is a flowchart of another optical communication method according to an embodiment of the present application, where the method is applied to an intermediate device included in an optical communication system, and the optical communication system further includes a plurality of access side light modules, where the plurality of access side light modules correspond to a plurality of uplink wavelengths, and the plurality of access side light modules correspond to a plurality of downlink wavelengths, where downlink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and where uplink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different. From the foregoing, it will be appreciated that the intermediate device may include a demultiplexer and an optical combiner, and that the optical combiner may include an optical coupler or multiplexer (such as a multiplexer), and that different types of optical combiners function similarly in embodiments of the present application. In the embodiment shown in fig. 12, taking an example that the intermediate device includes a demultiplexer and an optical coupler (as shown in fig. 2 to 8), some steps performed by the intermediate device are described, and in a case that the optical combiner in the intermediate device is a combiner (as shown in fig. 9), steps performed by the combiner are similar to those performed by the optical coupler, and will not be repeated. Referring to fig. 12, the method includes the following steps.

Step 1201, receiving a composite downlink optical signal, the composite downlink optical signal comprising a plurality of downlink optical signals.

In the embodiment of the application, the intermediate equipment further comprises at least one uplink interface, the uplink interface of the intermediate equipment is connected with the optical fiber, and the uplink interface of the intermediate equipment is connected with the central optical module through the optical fiber. The intermediate device may receive the composite downstream optical signal via the at least one upstream interface. Each uplink interface of the intermediate equipment is connected with one optical fiber, and different uplink interfaces are connected with different optical fibers.

In one possible implementation, the intermediate device includes a demultiplexer, an optical coupler, and two upstream interfaces (as shown in fig. 7 and 8), which are referred to as a first upstream interface and a second upstream interface of the intermediate device, respectively. The first uplink interface and the second uplink interface of the intermediate equipment are respectively connected with different optical fibers, the demultiplexer of the intermediate equipment is connected with the first uplink interface of the intermediate equipment, and the optical coupler of the intermediate equipment is connected with the second uplink interface of the intermediate equipment. Based on the above, the intermediate device receives the composite downlink optical signal transmitted on the connected optical fiber through the first uplink interface, and the first uplink interface transmits the composite downlink optical signal to the demultiplexer.

In another possible implementation, the intermediate device includes a demultiplexer, an optical coupler, a splitter connected to the upstream interface (in different embodiments, the splitter has a different name, such as may be referred to as a third splitter in the above system embodiment, and may be referred to as a second splitter in the fig. 12 embodiment), and an upstream interface (as shown in fig. 2 to 6), where the upstream interface connects an optical fiber, and the second splitter is connected to the upstream interface of the intermediate device, the demultiplexer, and the optical coupler, respectively. Based on the above, the implementation process of the intermediate device for receiving the composite downlink optical signal through the at least one uplink interface may include that the uplink interface of the intermediate device receives the composite downlink optical signal transmitted by the connected optical fiber, and transmits the received composite downlink optical signal to the second optical splitter. And then, the second beam splitter transmits the composite downlink optical signal to a demultiplexer of the intermediate device.

In the embodiment of the present application, the wavelength division intervals of the plurality of downlink wavelengths are larger than the wavelength division intervals of the plurality of uplink wavelengths, where the wavelength division intervals of the plurality of downlink wavelengths are the wavelength division intervals corresponding to the plurality of downlink optical signals included in the composite downlink optical signal, and the wavelength division intervals of the plurality of uplink wavelengths are the wavelength division intervals corresponding to the plurality of uplink optical signals included in the composite uplink optical signal.

In one possible implementation, the wavelength division interval of the plurality of downlink wavelengths is greater than or equal to a first threshold, the wavelength division interval of the plurality of uplink wavelengths is less than a second threshold, and the first threshold is greater than or equal to the second threshold.

In one possible implementation, the plurality of downlink optical signals included in the composite downlink optical signal are transmitted based on a Coarse Wavelength Division Multiplexing (CWDM) method. Reference is made to the above for a detailed description of CWDM and no further description is given here.

Step 1202, de-multiplexing a plurality of downlink optical signals from the composite downlink optical signal by a de-multiplexer.

That is, after receiving the composite downlink optical signal, the demultiplexer of the intermediate device may demultiplex a plurality of downlink optical signals from the composite downlink optical signal.

Step 1203, transmitting corresponding downlink optical signals to the access side optical modules based on the respective downlink wavelengths of the plurality of downlink optical signals obtained by demultiplexing.

In the embodiment of the application, the intermediate equipment further comprises a plurality of downlink interfaces, the downlink interfaces of the intermediate equipment are connected with optical fibers, the downlink interfaces are connected with a plurality of access side light modules through the optical fibers, and different access side light modules are connected with different downlink interfaces on the intermediate equipment. Based on the above, the intermediate device may send corresponding downlink optical signals to the plurality of access side optical modules through the plurality of downlink interfaces, where each downlink interface in the plurality of downlink interfaces sends an optical signal with a downlink wavelength, and downlink wavelengths of optical signals sent by different downlink interfaces in the plurality of downlink interfaces are different.

In one possible implementation, each of the plurality of downstream interfaces of the intermediate device is connected to an optical fiber, a different downstream interface is connected to a different optical fiber, the intermediate device further includes a plurality of first optical splitters, the demultiplexer of the intermediate device is connected to the plurality of first optical splitters, the optical coupler of the intermediate device is connected to the plurality of first optical splitters, each of the plurality of first optical splitters is connected to one of the plurality of downstream interfaces of the intermediate device, and the different first optical splitters are connected to different downstream interfaces (as shown in fig. 6 and 7). Based on this, after the demultiplexer demultiplexes the plurality of downlink optical signals from the composite downlink optical signal, one downlink optical signal may be respectively transmitted to each of the plurality of first optical splitters, where one first optical splitter receives one downlink optical signal, downlink wavelengths of optical signals received by different first optical splitters are different, the plurality of first optical splitters respectively transmit the respectively received downlink optical signals to respectively connected downlink interfaces, and each downlink interface in the plurality of downlink interfaces transmits the respectively received downlink optical signals through the respectively connected optical fibers.

In another possible implementation manner, each of the plurality of downstream interfaces of the intermediate device includes a first sub-interface and a second sub-interface, the demultiplexer of the intermediate device is respectively connected to the plurality of first sub-interfaces of the plurality of downstream interfaces, the optical coupler of the intermediate device is respectively connected to the plurality of second sub-interfaces of the plurality of downstream interfaces, and the second sub-interface and the first sub-interface of each downstream interface are respectively connected to different optical fibers (as shown in fig. 2 to 5 and 8). Based on this, after the demultiplexer demultiplexes the plurality of downlink optical signals from the composite downlink optical signal, the plurality of downlink optical signals may be transmitted to the plurality of first sub-interfaces, where one first sub-interface receives one downlink optical signal, downlink wavelengths of optical signals received by different first sub-interfaces are different, and the first sub-interface in each downlink interface transmits the downlink optical signal received by the first sub-interface through the connected optical fiber.

Through steps 1201 to 1203, the intermediate device may transmit a plurality of downlink optical signals included in the received composite downlink optical signal to a plurality of access side optical modules, where one access side optical module receives one downlink optical signal and different access side optical modules receive different downlink optical signals, so that the optical communication system completes downlink information transmission from the routing switch device to the access side optical modules through the intermediate device.

Next, the process of transmitting the upstream optical signal by the intermediate device will be described through steps 1204 and 1205.

And 1204, combining a plurality of uplink optical signals from the access side optical modules through an optical coupler to obtain a combined uplink optical signal.

In the embodiment of the application, the intermediate device comprises a plurality of downlink interfaces, and the intermediate device can receive corresponding uplink optical signals sent by the plurality of access side optical modules through the plurality of downlink interfaces, wherein each downlink interface in the plurality of downlink interfaces receives an optical signal with a downlink wavelength, and the uplink wavelengths of the optical signals received by different downlink interfaces in the plurality of downlink interfaces are different.

And when the intermediate device further comprises a plurality of first optical splitters (as shown in fig. 6 and 7), each of the plurality of downstream interfaces of the intermediate device receives an uplink optical signal transmitted by the respective connected optical fiber, wherein one downstream interface receives an uplink optical signal, the downstream wavelengths of the optical signals received by the different downstream interfaces are different, each of the plurality of downstream interfaces respectively transmits the respective received uplink optical signal to the respective connected first optical splitter, and the plurality of first optical splitters respectively transmit the respective received uplink optical signal to the optical coupler of the intermediate device.

In the case that each downstream interface of the intermediate device includes a first sub-interface and a second sub-interface (as shown in fig. 2 to 5 and 8), the second sub-interface of the plurality of downstream interfaces of the intermediate device receives the upstream optical signal transmitted by the optical fiber connected to the second sub-interface, and transmits the upstream optical signal received by the second sub-interface to the optical coupler of the intermediate device.

After receiving the plurality of uplink optical signals from the plurality of access side optical modules, the optical coupler can combine the plurality of uplink optical signals to obtain a combined uplink optical signal.

In one possible implementation, the plurality of uplink optical signals included in the composite uplink optical signal are transmitted based on a Dense Wavelength Division Multiplexing (DWDM) scheme. Reference is made to the above for a detailed description of DWDM and no further description is given here.

Step 1205, transmitting the composite uplink optical signal.

In the embodiment of the application, the intermediate device comprises at least one uplink interface, and the intermediate device can send the composite uplink optical signal through the at least one uplink interface. In this way, the intermediate device may transmit the composite upstream optical signal to the central optical module.

In the case that the intermediate device includes an upstream interface and further includes a second optical splitter (as shown in fig. 2 to 6), the optical coupler of the intermediate device transmits the composite upstream optical signal to the second optical splitter, and the second optical splitter transmits the composite upstream optical signal to the upstream interface of the intermediate device, where the upstream interface of the intermediate device transmits the composite upstream optical signal through the connected optical fiber.

In the case where the intermediate device includes a first upstream interface and a second upstream interface (as shown in fig. 7 and 8), the optical coupler of the intermediate device transmits the composite upstream optical signal to the second upstream interface, and the second upstream interface transmits the composite upstream optical signal to the connected optical fiber.

It should be understood that the steps 1201 to 1203 may occur sequentially, and the steps 1204 to 1205 may also occur sequentially, where the sub-flows including the steps 1201 to 1203 and the sub-flows including the steps 1204 to 1205 are not sequential, i.e. the transmission processes of the uplink and downlink information are independent of each other.

In summary, in the embodiment of the present application, the intermediate device adopts a combination scheme of a demultiplexer (such as DMUX) and an optical coupler (such as splitter) to transmit the optical signal, so that the cost of the intermediate device is lower, and meanwhile, the reliability of optical communication can be ensured.

Further, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, such as downlink coarse wavelength division and uplink dense wavelength division, so that the mixed wavelength division scheme is adopted to ensure the reliability of optical communication and simultaneously consider the cost of equipment/devices in an optical communication system and the difficulty of production and deployment.

Furthermore, under the condition that the access side light module comprises the adjustable wavelength laser and the uplink dense wavelength is divided, the normalization scheme of the access side light module can be enabled to be feasible, so that the production cost and the deployment difficulty of the access side light module are reduced, and the networking difficulty of optical communication is reduced.

The foregoing describes some implementations of the optical communication method provided by the embodiments of the present application. In combination with the foregoing, in the embodiment of the present application, the downstream wavelength division interval (i.e., the wavelength division intervals of the plurality of downstream wavelengths) is greater than the upstream wavelength division interval, for example, the downstream wavelength division interval adopts CWDM, and the upstream wavelength division interval adopts DWDM, so that the reliability of optical communication is ensured, and meanwhile, the cost of equipment/devices in the optical communication system and the difficulty of production and deployment are considered.

The central optical module is an optical module for receiving and transmitting multiple wavelengths, wherein a laser at the transmitting end of the central optical module adopts a fixed wavelength laser (such as a DFB laser), the fixed wavelength laser comprises a plurality of lasers, the transmitting wavelength of each laser is different, the fixed wavelength laser corresponds to a group of N access side optical modules (such as 8), and the fixed wavelength laser shares N fixed wavelengths. The receiving end of the central optical module can adopt a demultiplexer to obtain a plurality of uplink optical signals with different uplink wavelengths. The use of a fixed wavelength laser can reduce the cost of the central optical module.

The intermediate device may be a passive aggregation module, which serves as a transmission medium for optical signals between the central optical module and the access-side optical module. The downlink of the intermediate equipment demultiplexes the composite optical signal transmitted by the central optical module into a plurality of downlink optical signals through a demultiplexer, the plurality of downlink optical signals are respectively transmitted to a plurality of access side optical modules, and one access side optical module receives one downlink optical signal. The optical coupler or the wave combiner can be used as the optical combining device, and the optical combining device can be used for converging/coupling the uplink optical signals of the access side optical modules into one optical fiber. When the intermediate device is realized by adopting the demultiplexer and the optical coupler, the cost of the intermediate device can be reduced.

The plurality of access side light modules can be normalized optical modules, the receiving end is in broadband reception, and the transmitting end is in wavelength adjustment. The normalized optical module can reduce the production cost and the deployment difficulty of the access side optical module and reduce the networking difficulty of optical communication.

It should be appreciated that, in view of the loss of the optical signal during transmission in the optical fiber over a longer distance, the optical signal transmitted by the central optical module is not exactly the same as the optical signal received by the intermediate device, nor is the optical signal transmitted by the intermediate device identical to the optical signal received by the access side optical module, and therefore, in some embodiments, the transmitted optical signal and the received optical signal may be distinguished by words such as 'first', 'second', 'third', 'fourth'. For example, the composite downlink optical signal sent by the central optical module may be referred to as a first composite downlink optical signal, and after the first composite downlink optical signal is transmitted through an optical fiber between the central optical module and the intermediate device, the first composite downlink optical signal is changed into a second composite downlink optical signal due to loss, that is, the composite downlink optical signal received by the intermediate device may be referred to as a second composite downlink optical signal. In the embodiments of the present application, for the sake of simplicity and understanding, in the foregoing embodiments, the transmitted optical signal and the received optical signal may not be distinguished by naming, but do not represent that the transmitted optical signal and the received optical signal are identical optical signals.

In addition, for easy understanding, because the loss of optical signals transmitted in the same device is very small and can be almost ignored, in the embodiment of the application, the naming of the optical signals in the same device is simplified, and the optical signals transmitted and received between different modules in the same device are named as the same optical signal under the condition that the misunderstanding is avoided. For example, an optical signal output by an output terminal of a demultiplexer in the intermediate device and an optical signal received by a downstream interface of the intermediate device are named as the same optical signal. In fact, due to loss in optical fiber transmission, there may be a certain difference between the optical signal sent by the module and the optical signal received by the opposite module. For example, there may be a certain difference between an optical signal output by the output end of the demultiplexer in the intermediate device and an optical signal received by the downstream interface of the intermediate device.

The embodiment of the application also provides an access side light module which can be realized by software, hardware or a combination of the two to be part or all of the access equipment, wherein the access equipment can be any one of the systems shown in the figures 2 to 9, can also be the first access equipment in the method embodiments of the figures 10 to 13, and can also be independent of the access equipment and can be inserted into the access equipment when applied. Taking the access device as a first access device, taking the access side light module as a first optical module as an example, integrating or inserting the first optical module into the first access device, wherein the first optical module is mutually matched with other devices/apparatuses in the systems shown in fig. 2-9, so that the reliability of optical communication can be ensured, and the first optical module is a normalized access side light module, so that the production cost and the deployment difficulty of the access side light module are reduced.

The first optical module is any one of a plurality of access side optical modules included in an optical communication system, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules are also different, and the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths;

The optical receiving assembly is used for receiving a downlink optical signal transmitted by the optical fiber interface, and the wavelength of the downlink optical signal is a first downlink wavelength corresponding to the first optical module;

The optical transmitting assembly is used for generating an uplink optical signal and transmitting the uplink optical signal through the optical fiber interface, and the wavelength of the uplink optical signal is a first uplink wavelength corresponding to the first optical module.

In one possible implementation, the wavelength division intervals of the plurality of downstream wavelengths are determined based on a Coarse Wavelength Division Multiplexing (CWDM) scheme, and the wavelength division intervals of the plurality of upstream wavelengths are determined based on a Dense Wavelength Division Multiplexing (DWDM) scheme.

In one possible implementation, the wavelength division interval of the plurality of downlink wavelengths is greater than or equal to a first threshold, the wavelength division interval of the plurality of uplink wavelengths is less than a second threshold, and the first threshold is greater than or equal to the second threshold. The specific implementation of the wavelength division interval may refer to the relevant description of the above system and method embodiments, and will not be repeated here.

In one possible implementation, the first threshold is 20nm and the second threshold is 2.5nm.

In one possible implementation, the light receiving assembly includes an optical-to-electrical converter, and the light emitting assembly includes an adjustable wavelength laser having the ability to process optical signals of different downstream wavelengths, the adjustable wavelength laser having the ability to generate optical signals of different upstream wavelengths;

the photoelectric converter is used for carrying out photoelectric conversion on the downlink optical signals so as to obtain first electric signals;

The tunable wavelength laser is used for generating and sending an uplink optical signal through the optical fiber interface. The specific implementation of the photoelectric converter and the tunable wavelength laser may be referred to the related description in the above system and method embodiments, and will not be repeated here.

In one possible implementation, the first optical module is integrated or inserted into the first access device, and the downlink optical signal carries downlink information transmitted to the first access device;

The photoelectric converter is also used for transmitting a first electric signal to the first access equipment;

The wavelength-adjustable laser is also used for receiving a second electric signal transmitted by the first access device, and the uplink optical signal carries uplink information sent by the first access device through the second electric signal.

In one possible implementation, the optical fiber interface includes an uplink interface, the first optical module further includes a light splitting sheet, the uplink interface is connected to the first optical fiber, and the light splitting sheet is connected to the uplink interface;

The optical splitter is used for receiving the downlink optical signal transmitted by the first optical fiber through the uplink interface and transmitting the downlink optical signal to the photoelectric converter;

the optical splitter is further configured to send, through an uplink interface, an uplink optical signal generated by the wavelength-adjustable laser to the first optical fiber.

As shown in fig. 6 and 7, in the case of a single fiber connection between the intermediate device and the access side optical module, the access side optical module includes an uplink interface for connecting optical fibers, where the optical fibers connected to the uplink interface may be referred to as a first optical fiber, and a splitter connected to the uplink interface and also connected to an adjustable wavelength laser (such as TLD) and a photoelectric converter (such as PD) in the access side optical module. Specific implementation may refer to the relevant description of the system embodiment and the method embodiment, and will not be repeated here.

In one possible implementation, the optical fiber interface includes a first uplink interface and a second uplink interface, where the first uplink interface and the second uplink interface are respectively connected to different optical fibers;

The first uplink interface is used for receiving the downlink optical signals transmitted on the connected optical fibers and transmitting the downlink optical signals to the photoelectric converter;

and the second uplink interface is used for transmitting an uplink optical signal generated by the adjustable wavelength laser through the connected optical fiber.

As shown in fig. 2 to 5, 8 and 9, in the case of a dual-fiber connection between the intermediate device and the access side optical module, the access side optical module includes two upstream interfaces, respectively called a first upstream interface and a second upstream interface, which are connected to different optical fibers, where the first upstream interface is further connected to an optical-to-electrical converter (e.g., PD), and the second upstream interface is further connected to an adjustable wavelength laser (e.g., TLD). Specific implementations may refer to the relevant descriptions of the system embodiments and the method embodiments of fig. 2 to 5, 8 and 9, and are not repeated herein.

In one possible implementation, the tunable wavelength laser implements adjustment of the emission wavelength using a self-locking or injection locking mode of a DBR laser, an EA-modulated DBR laser, a Littman structure TECDL, littman-Metcalf structure TECDL, an FBG-TECDL, an MRR tunable laser, an SOA-based fully integrated tunable laser, an FP laser, a DFB laser array, or a TOSA.

In the embodiment of the application, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, such as downlink coarse wavelength division and uplink dense wavelength division, so that the mixed wavelength division scheme is adopted to ensure the reliability of optical communication and simultaneously consider the cost of equipment/devices in an optical communication system and the difficulty of production and deployment.

It should be noted that, when the access side optical module provided in the foregoing embodiment is matched with the access device to perform optical communication, only the division of the foregoing functional modules is illustrated, that is, the foregoing embodiment of the apparatus is merely illustrative, for example, the division of the modules is only one logic function division, and when actually implemented, there may be another division manner, that is, the foregoing function allocation may be performed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. For example, multiple modules or components may be combined or may be integrated into another device/apparatus, or some features may be omitted, or not performed. The functional modules in the embodiments of the present application may be integrated into one module, or each module may exist alone physically, or two or more modules may be integrated into one module. The units in the first optical module can be realized in a hardware mode, a software functional unit mode or a combination mode of software and hardware. In addition, the access side light module provided in the above embodiment belongs to the same concept as the optical communication method embodiment shown in fig. 10 to 13, and detailed implementation process of the access side light module is referred to the method embodiment and is not repeated here.

It should be further noted that, the access side light module provided in the embodiment of the present application may be applied to the optical communication systems shown in fig. 2to 9, and may also be applied to other communication systems, that is, the embodiment of the present application is not limited to the application scenario and the deployment location of the access side light module provided above, and for other devices/systems with optical communication requirements, the access side light module provided in the embodiment may also be deployed in other systems according to requirements.

The embodiment of the application also provides a central optical module which can be realized by software, hardware or a combination of the software and the hardware to be part or all of the routing switch equipment, wherein the routing switch equipment can be any one of the routing switch equipment in the systems shown in the figures 2 to 9, can also be the routing switch equipment in the method embodiments of the figures 10 to 13, and can also be independent of the routing switch equipment and inserted into the routing switch equipment when in application. In the embodiment of the application, the central optical module is integrated or inserted into the route switching device, and the central optical module is matched with other devices/apparatuses in the systems shown in fig. 2 to 9, so that the reliability of optical communication can be ensured.

The optical communication system comprises a central optical module, a plurality of access side optical modules, an optical transmission module, an optical receiving module, a light receiving module and a light receiving module, wherein the central optical module is contained in the optical communication system and further comprises a plurality of access side optical modules, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the central optical module comprises a fixed wavelength laser, the fixed wavelength laser is used for generating optical signals with a plurality of fixed wavelengths, and the plurality of fixed wavelengths comprise a plurality of downlink wavelengths;

The optical transmission assembly is used for transmitting a plurality of downlink optical signals through the optical fiber interface, the downlink optical signals are generated by the fixed wavelength laser, and the wavelengths of the downlink optical signals are respectively a plurality of downlink wavelengths;

the optical receiving assembly is used for receiving a plurality of uplink optical signals through the optical fiber interface, wherein the wavelengths of the uplink optical signals are respectively a plurality of uplink wavelengths;

Wherein, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths. Specific implementation may refer to the relevant description of the system embodiment and the method embodiment, and will not be repeated here.

In one possible implementation, the wavelength division interval of the plurality of downlink wavelengths is greater than or equal to a first threshold, the wavelength division interval of the plurality of uplink wavelengths is less than a second threshold, and the first threshold is greater than or equal to the second threshold. Specific implementations of the first threshold and the second threshold may refer to the relevant descriptions of the system embodiments and the method embodiments above, and are not repeated here.

In one possible implementation, the optical transmission assembly includes a multiplexer, and the optical fiber interface includes at least one downstream interface, and the downstream interface is connected to the optical fiber;

and the multiplexer is used for combining the plurality of downlink optical signals generated by the fixed wavelength laser into a composite downlink optical signal and transmitting the composite downlink optical signal through a downlink interface. The specific implementation of the multiplexer may refer to the relevant description of the system embodiment and the method embodiment above, and will not be repeated here.

In one possible implementation, the central optical module is integrated or plugged into the route switching device;

The fixed wavelength laser is used for generating a plurality of downlink optical signals according to a plurality of first electrical signals input by the routing exchange equipment, the downlink optical signals bear downlink information sent by the routing exchange equipment through the plurality of first electrical signals, the plurality of first electrical signals are in one-to-one correspondence with the plurality of access side light modules, and the downlink information comprises information sent to the plurality of access side light modules. Specific implementation of the fixed wavelength laser may refer to the related description of the system embodiment and the method embodiment, and will not be repeated here.

A demultiplexer, configured to receive and combine the uplink optical signal through the downlink interface;

The demultiplexer is further configured to demultiplex a plurality of uplink optical signals from the composite uplink optical signal, where the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the routing switch device;

and the photoelectric conversion device is used for respectively carrying out photoelectric conversion on the plurality of uplink optical signals so as to obtain a plurality of second electric signals, and sending the plurality of second electric signals to the routing exchange equipment. Specific implementations of the demultiplexer and the photoelectric conversion device may refer to the above embodiments of the system in fig. 2 to 9, and the related descriptions of the embodiments of the method in fig. 10 to 11, which are not repeated here.

In one possible implementation manner, the at least one downlink interface comprises a downlink interface, the central optical module further comprises a light splitting sheet, the light splitting sheet is respectively connected with the multiplexer and the demultiplexer, and the light splitting sheet is further connected with the downlink interface;

the beam splitter is used for sending a composite downlink optical signal to the downlink interface;

the optical splitter is also used for receiving the composite uplink optical signal transmitted on the connected optical fiber through the downlink interface and transmitting the composite uplink optical signal to the demultiplexer.

As shown in fig. 3, 6, and 9, in the case of a single fiber connection between the central optical module and the intermediate device, in one implementation manner thereof, the central optical module includes a DEMUX, a MUX, a beam splitter, and a downstream interface, where the MUX is used as a multiplexer, the DEMUX is used as a demultiplexer, and the beam splitter is connected to the MUX, the DEMUX, and the downstream interface, respectively, and the downstream interface is connected to the optical fiber. The MUX is also connected to a fixed wavelength laser (e.g., multiple LDs) in the central optical module, and the DEMUX is also connected to a photoelectric conversion device (e.g., multiple PDs) in the central optical module. Specific implementations may refer to the relevant descriptions of the system embodiments of fig. 3, fig. 6 and fig. 9, and are not repeated here.

In one possible implementation, the at least one downlink interface includes a downlink interface, the multiplexer being connected to the demultiplexer, the multiplexer also being connected to the downlink interface;

The multiplexer is used for sending the composite downlink optical signal to the downlink interface;

And the multiplexer is also used for receiving the composite uplink optical signal transmitted on the connected optical fiber through the downlink interface and transmitting the composite uplink optical signal to the demultiplexer.

As shown in fig. 5, in the case of a single fiber connection between the central optical module and the intermediate device, in another implementation manner, the central optical module includes a DEMUX, a MUX, and a downstream interface, where the MUX is used as a multiplexer, the DEMUX is used as a demultiplexer, the MUX has functions of combining and splitting waves, and the MUX is connected to the DEMUX and the downstream interface, and the downstream interface is connected to the optical fiber. The MUX is also connected to a fixed wavelength laser (e.g., multiple LDs) in the central optical module, and the DEMUX is also connected to a photoelectric conversion device (e.g., multiple PDs) in the central optical module. The specific implementation may be referred to the related description of the system embodiment of fig. 5, and will not be repeated here.

In one possible implementation manner, the at least one downlink interface includes a downlink interface, the central optical module further includes a photoelectric conversion device, and the multiplexer is connected with the downlink interface;

The multiplexer is also used for receiving the composite uplink optical signals transmitted on the connected optical fibers through the downlink interface;

The multiplexer is further used for demultiplexing a plurality of uplink optical signals from the composite uplink optical signals, and the plurality of uplink optical signals bear uplink information sent by the plurality of access side optical modules to the routing switching equipment;

And the photoelectric conversion device is used for respectively carrying out photoelectric conversion on the plurality of uplink optical signals so as to obtain a plurality of second electric signals, and sending the plurality of second electric signals to the routing exchange equipment. In some embodiments, the multiplexer may be referred to as a multiplexing demultiplexer.

In the case of a single fiber connection between the central optical module and the intermediate device, as shown in fig. 4, in yet another implementation, the central optical module includes a MUX and a downstream interface, where the MUX is used as a multiplexing demultiplexer, and the MUX has functions of combining, splitting and splitting, and the MUX is connected to the downstream interface, and the downstream interface is connected to the optical fiber. In addition, the MUX is also connected to a fixed wavelength laser (e.g., multiple LDs) in the central optical module and to a photoelectric conversion device (e.g., multiple PDs) in the central optical module. The specific implementation may be referred to the related description of the system embodiment of fig. 4, and will not be repeated here.

In one possible implementation, the at least one downlink interface includes a first downlink interface and a second downlink interface, the multiplexer is connected with the first downlink interface, the demultiplexer is connected with the second downlink interface, and the first downlink interface and the second downlink interface are respectively connected with different optical fibers;

the multiplexer is used for transmitting the composite downlink optical signal through the connected first downlink interface;

and the demultiplexer is used for receiving and combining the uplink optical signals through the connected second downlink interface.

As shown in fig. 7 and 8, in the case of a dual-fiber connection between the central optical module and the intermediate device, the central optical module may include a DEMUX, a MUX, and two downstream interfaces, which are respectively referred to as a first downstream interface and a second downstream interface, the MUX functioning as a multiplexer, the DEMUX functioning as a demultiplexer, the MUX being connected to the first downstream interface, the DEMUX being connected to the second downstream interface, the two downstream interfaces being connected to different optical fibers. The MUX is also connected to a fixed wavelength laser (e.g., multiple LDs) in the central optical module, and the DEMUX is also connected to a photoelectric conversion device (e.g., multiple PDs) in the central optical module. Specific implementation may refer to the relevant description of the system embodiments of fig. 7 and fig. 8, and will not be repeated here.

It should be noted that, when the central optical module provided in the foregoing embodiment is matched with the route switching device to perform optical communication, only the division of the functional modules is illustrated, that is, the embodiment of the apparatus is merely schematic, for example, the division of the modules is only one logic function division, and in actual implementation, there may be another division manner, that is, the function allocation may be performed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. For example, multiple modules or components may be combined or may be integrated into another device/apparatus, or some features may be omitted, or not performed. The functional modules in the embodiments of the present application may be integrated into one module, or each module may exist alone physically, or two or more modules may be integrated into one module. The above units in the central optical module may be realized in hardware, software functional units, or a combination of software and hardware. In addition, the central optical module provided in the above embodiment belongs to the same concept as the optical communication method embodiment shown in fig. 10 to 13, and detailed implementation processes of the central optical module are detailed in the method embodiment, which is not repeated here.

It should be further noted that, the central optical module provided in the embodiment of the present application may be applied to the optical communication systems shown in fig. 2 to 9, and may also be applied to other communication systems, that is, the embodiment of the present application is not limited to the application scenario and the deployment location of the central optical module provided above, and for other devices/systems with optical communication requirements, the central optical module provided in the embodiment may also be deployed in other systems according to requirements.

The embodiment of the application also provides an intermediate device, which can be the intermediate device in the system embodiment of fig. 2 to fig. 9, and can be used as the intermediate device in the optical communication method related to fig. 10 to fig. 13. That is, the intermediate device is included in an optical communication system, where the optical communication system further includes a plurality of access-side light modules, the plurality of access-side light modules corresponding to a plurality of uplink wavelengths, and the plurality of access-side light modules corresponding to a plurality of downlink wavelengths, where downlink wavelengths corresponding to different access-side light modules in the plurality of access-side light modules are different, and where uplink wavelengths corresponding to different access-side light modules in the plurality of access-side light modules are different.

In one implementation, an intermediate device includes a fiber optic interface, a demultiplexer, and an optical coupler, wherein,

The optical fiber interface is used for receiving a composite downlink optical signal, wherein the composite downlink optical signal comprises a plurality of downlink optical signals;

A demultiplexer, configured to demultiplex a plurality of downlink optical signals from the composite downlink optical signal, and send corresponding downlink optical signals to a plurality of access side optical modules based on respective downlink wavelengths of the plurality of downlink optical signals obtained by demultiplexing;

The optical fiber interface is also used for transmitting the composite uplink optical signal.

The demultiplexing may be a DEMUX shown in fig. 2 to 8, and the optical coupler may be a splitter/coupler.

In one possible implementation, the wavelength division interval of the plurality of downstream wavelengths is greater than the wavelength division interval of the plurality of upstream wavelengths. The specific implementation of the wavelength division interval may be referred to the related description in the above system and method embodiments, and will not be repeated here.

In one possible implementation, the plurality of downstream optical signals included in the composite downstream optical signal are transmitted based on a Coarse Wavelength Division Multiplexing (CWDM) scheme, and the plurality of upstream optical signals included in the composite upstream optical signal are transmitted based on a Dense Wavelength Division Multiplexing (DWDM) scheme.

In one possible implementation, the optical fiber interface includes at least one uplink interface and a plurality of downlink interfaces, where the uplink interfaces and the downlink interfaces are respectively connected with the optical fibers;

at least one uplink interface for receiving the composite downlink optical signal and transmitting the composite uplink optical signal;

The plurality of downlink interfaces are also used for receiving corresponding uplink optical signals sent by the plurality of access side optical modules, wherein each downlink interface in the plurality of downlink interfaces receives an optical signal with a downlink wavelength, and the uplink wavelengths of the optical signals received by different downlink interfaces in the plurality of downlink interfaces are different.

In one possible implementation, each of the upstream and downstream interfaces is connected to a respective optical fiber. As shown in fig. 2 to 8, in the case of a single-fiber or double-fiber connection between the intermediate device and the central optical module, each upstream interface is connected to one optical fiber. As shown in fig. 6 and 7, in the case of a single fiber connection between the intermediate device and the access side light module, each downstream interface is connected to one optical fiber.

In one possible implementation manner, the intermediate device further includes a plurality of first optical splitters, the demultiplexer is connected to the plurality of first optical splitters respectively, the optical coupler is connected to the plurality of first optical splitters respectively, each of the plurality of first optical splitters is connected to one of the plurality of downlink interfaces, and different first optical splitters are connected to different downlink interfaces;

A demultiplexer, configured to transmit a downlink optical signal to each of the plurality of first optical splitters, where one first optical splitter receives a downlink optical signal, and downlink wavelengths of optical signals received by different first optical splitters are different;

Each of the plurality of downstream interfaces is configured to transmit a downstream optical signal received by the respective optical fiber;

each downlink interface in the plurality of downlink interfaces is further configured to receive an uplink optical signal transmitted by the optical fiber connected to the downlink interface, where one downlink interface receives an uplink optical signal, and downlink wavelengths of optical signals received by different downlink interfaces are different;

each downlink interface in the plurality of downlink interfaces is further configured to transmit the received uplink optical signals to the connected first optical splitter respectively;

the plurality of first light splitting sheets are further used for respectively transmitting the received uplink optical signals to the optical coupler.

As shown in fig. 6 and fig. 7, in the case of single-fiber connection between the intermediate device and the access side optical module, the intermediate device includes a plurality of optical splitters connected to a plurality of downstream interfaces one by one, the plurality of optical splitters are referred to as a plurality of first optical splitters, a demultiplexer in the intermediate device is a DEMUX, and the plurality of first optical splitters are also connected to the DEMUX and the optical coupler respectively. Specific implementations may refer to fig. 6 and fig. 7, and are not described herein.

In one possible implementation manner, each downlink interface in the plurality of downlink interfaces includes a first sub-interface and a second sub-interface, the demultiplexer is respectively connected with the first sub-interfaces in the plurality of downlink interfaces, the optical coupler is respectively connected with the second sub-interfaces in the plurality of downlink interfaces, and the second sub-interface and the first sub-interface in each downlink interface are respectively connected with different optical fibers;

A demultiplexer, configured to transmit a plurality of downlink optical signals to a plurality of first subinterfaces, where one first subinterface receives one downlink optical signal, and downlink wavelengths of optical signals received by different first subinterfaces are different;

a first sub-interface in each downlink interface is used for transmitting downlink optical signals received by the first sub-interface through the connected optical fiber;

As shown in fig. 2 to 5 and 8, in the case of dual-fiber connection between the intermediate device and the access side optical module, each downlink interface of the intermediate device includes two sub-interfaces, which are respectively referred to as a first sub-interface and a second sub-interface, a demultiplexer in the intermediate device is a DEMUX, a plurality of first sub-interfaces are connected with the DEMUX, a plurality of second sub-interfaces are connected with the optical coupler, the plurality of first sub-interfaces are used for transmitting downlink optical signals, and the plurality of second sub-interfaces are used for receiving uplink optical signals. Specific implementations may refer to fig. 2 to 5 and 8, and are not described herein.

In one possible implementation manner, the optical fiber interface comprises an uplink interface, the intermediate device further comprises a second beam splitter, the uplink interface is connected with an optical fiber, and the second beam splitter is respectively connected with the uplink interface, the demultiplexer and the optical coupler;

the second beam splitter is used for sending the composite downlink optical signal to the demultiplexer;

an optical coupler for transmitting the composite upstream optical signal to the second optical splitter;

The second beam splitter is used for transmitting the composite uplink optical signal to the uplink interface;

and the uplink interface is also used for transmitting the composite uplink optical signal through the connected optical fiber.

As shown in fig. 2 to 6, in the case of a single-fiber connection between the intermediate device and the central optical module, the intermediate device includes an upstream interface and an optical splitter, the optical splitter is called a second optical splitter, the upstream interface is connected to an optical fiber, the demultiplexer in the intermediate device is a DEMUX, and the second optical splitter is connected to the upstream interface, the DEMUX and the optical coupler. Specific implementations may refer to fig. 2 to 6, and are not described herein.

In one possible implementation manner, the optical fiber interface includes a first uplink interface and a second uplink interface, the first uplink interface and the second uplink interface are respectively connected with different optical fibers, the demultiplexer is connected with the first uplink interface, and the optical coupler is connected with the second uplink interface;

the first uplink interface is used for receiving the composite downlink optical signal transmitted on the connected optical fiber and transmitting the composite downlink optical signal to the demultiplexer;

As shown in fig. 7 and 8, in the case of dual-fiber connection between the intermediate device and the central optical module, the intermediate device includes two uplink interfaces, which are respectively referred to as a first uplink interface and a second uplink interface, and the two uplink interfaces are respectively connected with different optical fibers, the demultiplexer in the intermediate device is a DEMUX, the DEMUX is connected with the first uplink interface, and the optical coupler is connected with the second uplink interface. Specific implementations may refer to fig. 7 and 8, and are not described herein.

In the embodiment of the application, the intermediate equipment adopts a combination scheme of a demultiplexer (such as DMUX) and an optical coupler (such as splitter) to transmit the optical signals, so that the cost of the intermediate equipment is lower, and the reliability of optical communication can be ensured.

It should be noted that, when the intermediate device provided in the foregoing embodiment is used for performing optical communications in conjunction with other devices/apparatuses in the optical communications system, the division of the functional modules is merely illustrative, that is, the embodiment of the foregoing apparatus is merely illustrative, for example, the division of the modules is merely one logic function division, and in actual implementation, there may be another division manner, that is, the foregoing function allocation may be performed by different functional modules as needed, that is, the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. For example, multiple modules or components may be combined or may be integrated into another device/apparatus, or some features may be omitted, or not performed. The functional modules in the embodiments of the present application may be integrated into one module, or each module may exist alone physically, or two or more modules may be integrated into one module. The above units in the intermediate device may be implemented in hardware, in software functional units, or in a combination of hardware and software. In addition, the intermediate device provided in the above embodiment belongs to the same concept as the optical communication method embodiment shown in fig. 10 to 13, and detailed implementation processes of the intermediate device are shown in the method embodiment, which is not repeated here.

It should be further noted that, the intermediate device provided in the embodiment of the present application may be applied to the optical communication systems shown in fig. 2 to 9, and may also be applied to other communication systems, that is, the embodiment of the present application is not limited to the application scenario and the deployment location of the intermediate device provided above, and for other devices/systems with optical communication requirements, the intermediate device provided in the embodiment may also be deployed in other systems according to requirements.

Fig. 13 is a schematic structural diagram of a network device according to an embodiment of the present application, where the network device may be an access device, a routing switch device, or an intermediate device in any of the foregoing embodiments. The network device may be a switch, router, or other network device that forwards messages. In this embodiment, the network device includes a memory 1303 and one or more processors 1301.

Processor 1301 is a general purpose central processing unit (central processing unit, CPU), network processor (network processor, NP), microprocessor, or one or more integrated circuits for implementing aspects of the application, such as an Application Specific Integrated Circuit (ASIC), programmable logic device (programmable logic device, PLD), or a combination thereof. Alternatively, the PLD is a complex programmable logic device (complex programmable logic device, CPLD), an FPGA, general-purpose array logic (GENERIC ARRAY logic, GAL), or any combination thereof. When the network device is any one of the access devices, the routing switch devices, or the intermediate devices in the embodiments of the present application, the processor 1301 is configured to cooperate with other devices/apparatuses in the optical communication system, so as to implement the optical communication method provided in any one of the embodiments shown in fig. 10 to 13.

For example, in the case that the network device is a routing switch device, the network device is integrated with or plugged into a central optical module, and the processor of the network device can control the central optical module to generate an optical signal carrying downlink information, and in the case that the network device is an access device, the network device is integrated with or plugged into an access side optical module, and the processor of the network device can control the access side optical module to generate an optical signal carrying uplink information.

In one implementation, the network device also includes a communication bus 1302, where the communication bus 1302 is used to communicate information between the above-described components. The communication bus 1302 is classified into an address bus, a data bus, a control bus, and the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.

In some embodiments, memory 1303 is read-only memory (ROM), random-access memory (random access memory, RAM), electrically erasable programmable read-only memory (EEPROM), optical disks (including, but not limited to, compact discs (CD-ROMs), compact discs, laser discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other media capable of being used to carry or store desired program code in the form of instructions or data structures and capable of being accessed by a computer. The memory 1303 exists independently and is connected to the processor 1301 through the communication bus 1302, or the memory 1303 is integrated with the processor 1301.

In one implementation, the network device also includes one or more communication interfaces 1304, the communication interfaces 1304 using any transceiver-like means for communicating with other devices or communication networks. The communication interface 1304 includes a wired communication interface and optionally also a wireless communication interface. Wherein the wired communication interface is for example an ethernet interface or the like. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless communication interface is a wireless local area network (wireless local area networks, WLAN) interface, a cellular network communication interface, a combination thereof, or the like.

For example, in the case where the network device is a routing switch device, the network device is integrated with or plugged into a central optical module, and the network device may send an electrical signal carrying downstream information to the central optical module through an electrical interface, so that the central optical module generates and sends an optical signal based on the electrical signal. For example, the network device sends a plurality of electrical signals to the central optical module through the electrical interface, and the central optical module generates a plurality of downlink optical signals based on the plurality of electrical signals, merges the plurality of downlink optical signals into a composite downlink optical signal, and sends the composite downlink optical signal. The network device can also receive the electrical signal sent by the central optical module through the electrical interface, so as to obtain the uplink information carried by the electrical signal. Specific implementation may refer to the relevant description of the above system and method embodiments, and will not be repeated here.

In the case where the network device is an access device, the network device is integrated with or has an access-side optical module interposed therein, and the network device may transmit an electrical signal to the access-side optical module through an electrical interface such that the access-side optical module generates and transmits an optical signal based on the electrical signal. The network device can also receive the electric signal sent by the access side light module through the electric interface, so as to obtain the downlink information carried by the electric signal. Specific implementation may refer to the relevant description of the above system and method embodiments, and will not be repeated here.

In the case where the network device is an intermediate device, the network device includes an optical interface (also referred to as a fiber interface), which may include a plurality of downstream interfaces and at least one upstream interface. The network device may receive an optical signal (e.g., a composite downstream optical signal) transmitted by the central optical module via the upstream interface and transmit an optical signal (e.g., a composite upstream optical signal) to the central optical module. The network device may also receive, through the downstream interface, an optical signal transmitted by the access-side optical module (i.e., an optical signal of an upstream wavelength corresponding to each access-side optical module), and transmit, to the access-side optical module, an optical signal (i.e., an optical signal of a downstream wavelength corresponding to each access-side optical module). Specific implementation may refer to the relevant description of the above system and method embodiments, and will not be repeated here.

In some embodiments, the network device includes multiple processors, such as processor 1301 and processor 1305 shown in fig. 13. Each of these processors is a single-core processor, or a multi-core processor. A processor herein refers to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions). As one example, each processor may include one or more CPUs, such as each processor shown in fig. 13 including CPU0 and CPU1.

In some embodiments, the network device further comprises an output device and an input device. An output device communicates with processor 1301 and can display information in a variety of ways. For example, the output device is a Liquid Crystal Display (LCD) CRYSTAL DISPLAY, a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. An input device is in communication with processor 1301 and is capable of receiving user input in a variety of ways. For example, the input device is a mouse, a keyboard, a touch screen device, a sensing device, or the like.

In some embodiments, the memory 1303 is configured to store program codes 1310 for executing the solutions of the present application, and the processor 1301 is capable of executing the program codes 1310 stored in the memory 1303 to cause the network device to execute the processing steps of the access device or the routing switch device or the intermediate device in the embodiments shown in fig. 10 to 13, and the specific implementation may refer to the detailed description in the embodiments shown in fig. 10 to 13, which is not repeated herein.

The embodiments of the present application also provide a computer readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform the steps of the optical communication method shown in the above-described method embodiments.

The embodiments of the present application also provide a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps of the optical communication method shown in the above-mentioned method embodiments.

The embodiment of the application also provides a computer program which, when run on a computer, causes the computer to execute the steps of the optical communication method shown in the embodiment of the method.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, data subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital versatile disk (DIGITAL VERSATILE DISC, DVD)), or a semiconductor medium (e.g., solid State Disk (SSD)), etc. It is noted that the computer readable storage medium mentioned in the embodiments of the present application may be a non-volatile storage medium, in other words, may be a non-transitory storage medium.

It should be understood that references herein to "at least one" mean one or more, and "a plurality" means two or more. In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B, and "and/or" herein is merely an association relationship describing an association object, and means that there may be three relationships, for example, a and/or B, and that there may be three cases where a exists alone, while a and B exist together, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

It should be noted that, the information (including but not limited to user equipment information, user personal information, etc.), data (including but not limited to data for analysis, stored data, presented data, etc.), and signals related to the embodiments of the present application are all authorized by the user or are fully authorized by the parties, and the collection, use, and processing of the related data is required to comply with the relevant laws and regulations and standards of the relevant countries and regions.

The embodiments of the present application are not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art should be included in the scope of the present application.

Claims

1. The optical communication system is characterized by comprising a central optical module and a plurality of access side optical modules, wherein the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, the wavelength band of the plurality of uplink wavelengths is completely separated from the wavelength band of the plurality of downlink wavelengths, the central optical module is connected with the plurality of access side optical modules, the central optical module comprises a fixed wavelength laser, the fixed wavelength laser is used for generating optical signals with a plurality of fixed wavelengths, the plurality of fixed wavelengths comprise the plurality of downlink wavelengths, each access side optical module in the plurality of access side optical modules comprises an uplink interface, a second optical splitter, a photoelectric converter and an optical splitter, and each optical splitter in the plurality of access side optical splitters are connected with the laser light converter, and the second optical splitter module are connected with the laser;

2. The system of claim 1, wherein the plurality of downstream optical signals included in the composite downstream optical signal are transmitted on a coarse wavelength division multiplexing, CWDM, basis and the plurality of upstream optical signals included in the composite upstream optical signal are transmitted on a dense wavelength division multiplexing, DWDM, basis.

3. The system of claim 1, wherein the wavelength division intervals of the plurality of downstream wavelengths are greater than or equal to a first threshold, the wavelength division intervals of the plurality of upstream wavelengths are less than a second threshold, and the first threshold is greater than or equal to the second threshold.

4. The system of claim 3, wherein the first threshold is 20 nanometers and the second threshold is 2.5 nanometers.

5. The system of claim 1, wherein the tunable wavelength laser in each of the access-side light modules is configured to transmit an optical signal of an uplink wavelength corresponding to the access-side light module to the second dichroic sheet in the access-side light module;

The second light splitting piece in each access side light module is used for sending an optical signal of an uplink wavelength corresponding to the access side light module to the central light module through an uplink interface of the access side light module;

The uplink interface in each access side light module is used for receiving the optical signal of the downlink wavelength corresponding to the access side light module and transmitting the optical signal of the downlink wavelength corresponding to the access side light module to the second light splitting piece in the access side light module;

The second light splitting piece in each access side light module is used for transmitting the optical signal of the downlink wavelength corresponding to the access side light module to the photoelectric converter in the access side light module.

6. The system of any one of claims 1-5, further comprising an intermediate device, the intermediate device comprising a first demultiplexer and an optical combiner, the intermediate device being connected to the central optical module by optical fibers, the intermediate device being further connected to the plurality of access-side optical modules by optical fibers, respectively;

7. The system of claim 6, wherein the intermediate device further comprises at least one upstream interface and a plurality of downstream interfaces, the intermediate device is connected to the central optical module by optical fibers via the at least one upstream interface, and the intermediate device is connected to the plurality of access-side optical modules by optical fibers via the plurality of downstream interfaces, respectively;

8. The system of claim 7, wherein each of the plurality of downstream interfaces is coupled to an optical fiber.

9. The system of claim 8, wherein the intermediate device further comprises a plurality of first optical splitters, the first demultiplexer is respectively connected to the plurality of first optical splitters, the optical combiner is respectively connected to the plurality of first optical splitters, each first optical splitter of the plurality of first optical splitters is connected to one of the plurality of downstream interfaces, and a different first optical splitter is connected to a different downstream interface; the second light splitting piece in each access side light module is connected with one downlink interface of the intermediate equipment through an optical fiber, the second light splitting piece in different access side light modules in the plurality of access side light modules is connected with different downlink interfaces of the intermediate equipment, and the second light splitting piece in the first light module in the plurality of access side light modules is connected with the first downlink interface in the plurality of downlink interfaces through a first optical fiber;

10. The system of any of claims 7-9, wherein the light combining device comprises an optical coupler.

11. The system of any of claims 7-9, wherein the central optical module further comprises a downstream interface, the downstream interface of the central optical module being connected to an optical fiber.

12. The system of claim 11, wherein the central optical module further comprises a fourth optical splitter, a first multiplexer, a second demultiplexer, and a photoelectric conversion device, the fourth optical splitter being connected to the downstream interface of the central optical module, the fourth optical splitter further being connected to the first multiplexer and the second demultiplexer, respectively;

13. The system of claim 11, wherein the central optical module further comprises a second multiplexer, a third demultiplexer, and a photoelectric conversion device, the second multiplexer being connected to the downstream interface of the central optical module, the second multiplexer being further connected to the third demultiplexer;

the third demultiplexer is configured to receive the composite uplink optical signal transmitted by the second multiplexer, and demultiplex the plurality of uplink optical signals from the composite uplink optical signal;

14. The system of claim 11, wherein the central optical module further comprises a multiplexing demultiplexer and a photoelectric conversion device, the multiplexing demultiplexer being connected to a downstream interface of the central optical module;

15. The system of any one of claims 12-14, wherein the intermediate device comprises an upstream interface and a third splitter, the upstream interface of the intermediate device is connected to the downstream interface of the central optical module through an optical fiber, and the third splitter is connected to the upstream interface of the intermediate device, the first demultiplexer, and the combiner, respectively;

the third optical splitter is configured to receive, through an uplink interface of the intermediate device, a composite downlink optical signal sent by the central optical module, and transmit the composite downlink optical signal to the first demultiplexer;

The third light splitting piece is further configured to receive the composite uplink optical signal transmitted by the light combining device, and send the composite uplink optical signal to the central optical module through an uplink interface of the intermediate device.

16. The system of any of claims 7-9, wherein the central optical module further comprises a second downstream interface, a third downstream interface, a first multiplexer, a second demultiplexer, and a photoelectric conversion device, the first multiplexer being connected to the second downstream interface, the second demultiplexer being connected to the third downstream interface;

The photoelectric conversion device is used for converting the plurality of uplink optical signals into a plurality of second electrical signals and outputting the plurality of second electrical signals to the routing switch equipment.

17. The system of claim 16, wherein the intermediate device comprises a first upstream interface and a second upstream interface, wherein the first upstream interface is connected to a second downstream interface of the central optical module, and the second upstream interface is connected to a third downstream interface of the central optical module via optical fibers, respectively;

18. The system of any one of claims 1-5, 7-9, 12-14, 17, wherein the optical-to-electrical converter in each access-side optical module has the ability to process optical signals of different downstream wavelengths;

19. The system of any one of claims 1-5, 7-9, 12-14, 17, wherein the central optical module integrates or plugs into a routing switch, wherein the downstream wavelength optical signal carries downstream information sent by the routing switch, and/or wherein,

20. An optical communication method is characterized in that an optical communication system comprises a plurality of access side light modules, the plurality of access side light modules correspond to a plurality of uplink wavelengths, the plurality of access side light modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side light modules are different, the uplink wavelengths corresponding to different access side light modules are also different, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, the wavelength band of the plurality of uplink wavelengths is completely separated from the wavelength band of the plurality of downlink wavelengths, the method is applied to a first optical module in the plurality of access side light modules, the first optical module is any one of the plurality of access side light modules, the first optical module comprises an uplink interface, a light splitting sheet, a photoelectric converter and an adjustable wavelength laser, and the light splitting sheet is respectively connected with the uplink interface, the photoelectric converter and the adjustable wavelength laser, and the method comprises the steps of:

21. The method of claim 20, wherein the wavelength division intervals for the plurality of downstream wavelengths are greater than or equal to a first threshold, the wavelength division intervals for the plurality of upstream wavelengths are less than a second threshold, and the first threshold is greater than or equal to the second threshold.

22. The method of claim 21, wherein the first threshold is 20 nanometers and the second threshold is 2.5 nanometers.

23. The method of any of claims 20-22, wherein the optical-to-electrical converter has the capability of processing optical signals of different downstream wavelengths and the tunable wavelength laser has the capability of generating optical signals of different upstream wavelengths, the method further comprising:

the generating and transmitting the uplink optical signal includes:

24. The method of claim 23, wherein the first optical module is integrated with or inserted into a first access device, the downstream optical signal carries downstream information transmitted to the first access device, and the optical-to-electrical converter photoelectrically converts the downstream optical signal to obtain a first electrical signal, the method further comprising:

25. The method of claim 23, wherein the upstream interface of the first optical module is coupled to a first optical fiber, and the splitter plate is coupled to the upstream interface;

The receiving the downlink optical signal includes:

The sending the uplink optical signal includes:

The wavelength-adjustable laser sends the generated uplink optical signal to the light splitting sheet;

26. The method of claim 24, wherein the upstream interface of the first optical module is coupled to a first optical fiber, and the splitter plate is coupled to the upstream interface;

The receiving the downlink optical signal includes:

The sending the uplink optical signal includes:

27. The optical communication method is characterized in that the method is applied to a central optical module in an optical communication system, the optical communication system further comprises a plurality of access side optical modules, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the wave bands where the plurality of uplink wavelengths are located are completely separated from the wave bands where the plurality of downlink wavelengths are located, the downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the central optical module comprises a fixed wavelength laser, the fixed wavelength laser is used for generating optical signals with a plurality of fixed wavelengths, and the plurality of fixed wavelengths comprise the plurality of downlink wavelengths, and the method comprises:

28. The method of claim 27, wherein the wavelength division intervals for the plurality of downstream wavelengths are greater than or equal to a first threshold, the wavelength division intervals for the plurality of upstream wavelengths are less than a second threshold, and the first threshold is greater than or equal to the second threshold.

29. The method of claim 28, wherein the first threshold is 20 nanometers and the second threshold is 2.5 nanometers.

30. The method of any of claims 27-29, wherein the central optical module further comprises a multiplexer and at least one downstream interface, the downstream interface being connected to an optical fiber;

the transmitting a plurality of downlink optical signals includes:

31. The method of claim 30, wherein the central optical module is integrated or plugged into a routing switch device;

32. The method of claim 31, wherein the central optical module further comprises an optical-to-electrical conversion device and a demultiplexer;

the receiving a plurality of uplink optical signals includes:

The method further comprises the steps of:

33. The method of claim 32, wherein the central optical module comprises a downstream interface and a splitter, the splitter being coupled to the multiplexer and the demultiplexer, respectively, the splitter being further coupled to the downstream interface;

34. The method of claim 32, wherein said central optical module includes a downstream interface, said multiplexer being coupled to said demultiplexer, said multiplexer being further coupled to said downstream interface;

35. The method of claim 31, wherein the central optical module includes a downstream interface and a photoelectric conversion device, the multiplexer being connected to the downstream interface;

36. The method of claim 32, wherein the downstream interface of the central optical module comprises a first downstream interface and a second downstream interface, the multiplexer being connected to the first downstream interface, the demultiplexer being connected to the second downstream interface, the first downstream interface and the second downstream interface being connected to different optical fibers, respectively;

37. The optical communication method is characterized in that the method is applied to an intermediate device included in an optical communication system, the optical communication system further includes a plurality of access side optical modules, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, a wavelength division interval of the plurality of downlink wavelengths is larger than a wavelength division interval of the plurality of uplink wavelengths, a wavelength band of the plurality of uplink wavelengths is completely separated from a wavelength band of the plurality of downlink wavelengths, downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, and the intermediate device includes a demultiplexer and an optical coupler, and the method includes:

And transmitting the composite uplink optical signal.

38. The method of claim 37, wherein the plurality of downstream optical signals included in the composite downstream optical signal are transmitted on a coarse wavelength division multiplexing, CWDM, basis and the plurality of upstream optical signals included in the composite upstream optical signal are transmitted on a dense wavelength division multiplexing, DWDM, basis.

39. The method of claim 37 or 38, wherein the intermediate device further comprises at least one upstream interface and a plurality of downstream interfaces, the upstream interface and the downstream interface being respectively connected to optical fibers;

40. The method of claim 39, wherein each of the upstream and downstream interfaces is coupled to a respective optical fiber.

41. The method of claim 40, wherein the intermediate device further comprises a plurality of first optical splitters, the demultiplexer is respectively connected to the plurality of first optical splitters, the optical coupler is respectively connected to the plurality of first optical splitters, each first optical splitter of the plurality of first optical splitters is connected to one downstream interface of the plurality of downstream interfaces, and a different first optical splitter is connected to a different downstream interface;

42. The method of claim 40 or 41, wherein the intermediate device comprises an upstream interface and a second splitter, the upstream interface being coupled to an optical fiber, the second splitter being coupled to the upstream interface, the demultiplexer, and the optical coupler, respectively;

43. The method of claim 40 or 41, wherein the intermediate device comprises a first upstream interface and a second upstream interface, the first upstream interface and the second upstream interface being respectively connected to different optical fibers, the demultiplexer being connected to the first upstream interface, the optical coupler being connected to the second upstream interface;

44. The first optical module is characterized by comprising a plurality of access side optical modules, wherein the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules are also different, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, the wave band of the plurality of uplink wavelengths is completely separated from the wave band of the plurality of downlink wavelengths, the first optical module is any one of the plurality of access side optical modules, the first optical module comprises an optical fiber interface, an optical receiving assembly and an optical transmitting assembly, the optical receiving assembly comprises an optical-electric converter, the optical fiber interface comprises an uplink interface, the first optical module further comprises a light splitting sheet, and the optical-electric converter, and the optical fiber interface and the optical-electric converter are respectively connected with each other;

45. The first optical module of claim 44, wherein the wavelength division intervals of the plurality of downstream wavelengths are greater than or equal to a first threshold, the wavelength division intervals of the plurality of upstream wavelengths are less than a second threshold, and the first threshold is greater than or equal to the second threshold.

46. The first optical module of claim 45, wherein the first threshold is 20 nanometers and the second threshold is 2.5 nanometers.

47. The first optical module of any one of claims 44-46, wherein the fiber optic interface is configured to receive the downstream optical signal and transmit the downstream optical signal to the optical-to-electrical converter via the optical splitter;

the wavelength-adjustable laser is used for generating the uplink optical signal and sending the uplink optical signal to the optical splitter;

The optical splitter is used for sending the uplink optical signal through the optical fiber interface.

48. The first optical module of any one of claims 44-46, wherein the optical-to-electrical converter has the capability of processing optical signals of different downstream wavelengths, and wherein the tunable wavelength laser has the capability of generating optical signals of different upstream wavelengths;

the wavelength-adjustable laser is used for generating the uplink optical signal according to a second electric signal.

49. The first optical module of claim 47, wherein the upstream interface is coupled to a first optical fiber;

50. The central optical module is characterized by comprising an optical communication system, wherein the optical communication system further comprises a plurality of access side optical modules, the plurality of access side optical modules correspond to a plurality of uplink wavelengths, the plurality of access side optical modules correspond to a plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the uplink wavelengths corresponding to different access side optical modules in the plurality of access side optical modules are different, the central optical module comprises a fixed wavelength laser, the fixed wavelength laser is used for generating optical signals with a plurality of fixed wavelengths, the plurality of fixed wavelengths comprise the plurality of downlink wavelengths, and the central optical module further comprises an optical fiber interface, an optical transmitting component and an optical receiving component;

the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, and the wave band where the plurality of uplink wavelengths are located is completely separated from the wave band where the plurality of downlink wavelengths are located.

51. The central optical module of claim 50, wherein the wavelength division intervals of the plurality of downstream wavelengths are greater than or equal to a first threshold, the wavelength division intervals of the plurality of upstream wavelengths are less than a second threshold, and the first threshold is greater than or equal to the second threshold.

52. The central light module of claim 51 wherein the first threshold is 20 nanometers and the second threshold is 2.5 nanometers.

53. The central optical module of any one of claims 50-52 wherein the optical transmission assembly comprises a multiplexer and the optical fiber interface comprises at least one downstream interface, the downstream interface being coupled to an optical fiber;

54. The central optical module of claim 53, wherein the central optical module is integrated or plugged into a routing switch device;

55. The central optical module of claim 54, wherein the optical receiving assembly comprises a demultiplexer, the central optical module further comprising an optical-to-electrical conversion device;

56. The central optical module of claim 55 wherein the at least one downstream interface comprises a downstream interface, the central optical module further comprising a splitter connected to the multiplexer and the demultiplexer, respectively, the splitter further connected to the downstream interface;

57. The central optical module of claim 55 wherein the at least one downstream interface comprises a downstream interface, the multiplexer being coupled to the demultiplexer, the multiplexer being further coupled to the downstream interface;

58. The central optical module of claim 54 wherein said at least one downstream interface comprises a downstream interface, said central optical module further comprising a photoelectric conversion device, said multiplexer being connected to said downstream interface;

59. The central optical module of claim 55 wherein the at least one downstream interface further comprises a first downstream interface and a second downstream interface, the multiplexer being connected to the first downstream interface, the demultiplexer being connected to the second downstream interface, the first downstream interface and the second downstream interface being connected to different optical fibers, respectively;

the demultiplexer is further configured to receive the composite uplink optical signal through the connected second downlink interface.

60. The intermediate device is characterized in that the intermediate device is included in an optical communication system, the optical communication system further comprises a plurality of access side light modules, the plurality of access side light modules correspond to a plurality of uplink wavelengths, the plurality of access side light modules correspond to a plurality of downlink wavelengths, the wavelength division interval of the plurality of downlink wavelengths is larger than the wavelength division interval of the plurality of uplink wavelengths, the wavelength band of the plurality of uplink wavelengths is completely separated from the wavelength band of the plurality of downlink wavelengths, the downlink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, the uplink wavelengths corresponding to different access side light modules in the plurality of access side light modules are different, and the intermediate device comprises an optical fiber interface, a demultiplexer and an optical coupler;

61. The intermediate device as defined in claim 60 wherein the plurality of downstream optical signals included in the composite downstream optical signal are transmitted on a coarse wavelength division multiplexed, CWDM, basis and the plurality of upstream optical signals included in the composite upstream optical signal are transmitted on a dense wavelength division multiplexed, DWDM, basis.

62. An intermediate as defined in claim 60 or 61 wherein the optical fibre interface comprises at least one upstream interface and a plurality of downstream interfaces, the upstream and downstream interfaces each connecting optical fibres;

63. The intermediary device of claim 62, wherein each of the upstream and downstream interfaces is coupled to a respective one of the optical fibers.

64. The intermediate device as recited in claim 63, wherein the intermediate device further comprises a plurality of first optical splitters, the demultiplexer is respectively connected to the plurality of first optical splitters, the optical coupler is respectively connected to the plurality of first optical splitters, each first optical splitter of the plurality of first optical splitters is connected to one downstream interface of the plurality of downstream interfaces, and a different first optical splitter is connected to a different downstream interface;

65. The intermediate device of claim 63 or 64, wherein said fiber optic interface comprises an upstream interface, said intermediate device further comprising a second splitter, said upstream interface coupled to an optical fiber, said second splitter coupled to said upstream interface, said demultiplexer, and said optical coupler, respectively;

66. The intermediate device of claim 63 or 64, wherein the fiber interface comprises a first upstream interface and a second upstream interface, the first upstream interface and the second upstream interface being respectively connected to different optical fibers, the demultiplexer being connected to the first upstream interface, the optical coupler being connected to the second upstream interface;