CN118158583A - Optical line terminal, optical network unit, extension head and networking system - Google Patents

Abstract

The embodiment of the application provides an optical line terminal, an optical network unit, an extension head and a networking system, and relates to the technical field of optical network communication. The wave band group of the second port works is the same as the wave band group of the optical path component connected with the second port; an optical module is configured on the OLT and is optically connected with at least one ONU through an optical splitter; the optical module comprises a plurality of groups of optical path components, the optical modules comprise different wave band groups for working, and the working bandwidth is a preset standard bandwidth; a plurality of groups of optical path components are configured on the port of the ONU connecting optical splitter; the wave band groups of the ONU, in which the multiple groups of optical path components work, are different, and the working bandwidth is a preset standard bandwidth. The scheme can solve the problem of excessive bandwidth.

Description

Optical line terminal, optical network unit, extension head and networking system

Technical Field

The present application relates to the field of optical network communications technologies, and in particular, to an optical line terminal, an optical network unit, an extension head, and a networking system.

Background

With the development of optical network technology, the bandwidth of a passive optical network (Passive Optical Network, PON) is greatly improved, the 10G PON is directly upgraded to a 50G PON, and the PON with the standard bandwidth of 10G-50G is lacking. However, many access networks require bandwidths greater than 10G and less than 50G. If the 10G PON is adopted to build the access network, the bandwidth of the access network cannot be met, and if the 50G PON is adopted to build the access network, the problem of excessive bandwidth exists.

Disclosure of Invention

The embodiment of the application aims to provide an optical line terminal, an optical network unit, an extension head and a networking system so as to solve the problem of excessive bandwidth. The specific technical scheme is as follows:

In a first aspect, an embodiment of the present application provides an optical line terminal, where an optical module is configured on the optical line terminal, and the optical module is optically connected to at least one optical network unit through an optical splitter;

The optical module comprises a plurality of groups of optical path components, the wave band groups of the plurality of groups of optical path components are different, and the working bandwidth of the plurality of groups of optical path components is a preset standard bandwidth;

the optical path component is used for converting a first electric signal into a first optical signal and transmitting the first optical signal to the at least one optical network unit; or, receiving a second optical signal sent by the at least one optical network unit, and converting the second optical signal into a second electrical signal.

In some embodiments, the light path assembly includes a light emitting subassembly and a light receiving subassembly; the light emitting subassembly operates in a downstream band and the light receiving subassembly operates in an upstream band.

In some embodiments, the number of sets of the plurality of sets of light path components is 2.

In some embodiments, the preset standard bandwidth is 10G.

In a second aspect, an embodiment of the present application provides an optical network unit, where the optical network unit is optically connected to at least one optical line terminal through an optical splitter; a plurality of groups of optical path components are configured on the port of the optical network unit connected with the optical splitter;

the wave band groups of the operation of the plurality of groups of light path components are different, and the operation bandwidth of the plurality of groups of light path components is a preset standard bandwidth;

the optical path component is used for converting a second electric signal into a second optical signal and transmitting the second optical signal to the at least one optical line terminal; or, receiving a first optical signal sent by the at least one optical line terminal, and converting the first optical signal into a first electrical signal.

In some embodiments, the light path assembly includes a light emitting subassembly and a light receiving subassembly; the optical transmitting subassembly operates in an upstream band, and the optical receiving subassembly operates in a downstream band.

In some embodiments, the number of sets of the plurality of sets of light path components is 2.

In some embodiments, the preset standard bandwidth is 10G.

In a third aspect, an embodiment of the present application provides an expansion head, where the expansion head is configured with a first port and a plurality of second ports, where the first port is optically connected to any one of the optical line ports provided in the first aspect through an optical splitter, and the plurality of second ports are respectively optically connected to multiple groups of optical path components of any one of the optical network units provided in the second aspect; the wave band group of each second port works is the same as the wave band group of the optical path component connected with the second port;

The extension head is used for:

Receiving a first optical signal from the at least one optical line terminal through the first port, dividing the first optical signal into multiple paths of third optical signals, and respectively sending the multiple paths of third optical signals to multiple groups of optical path components of the optical network unit through the multiple second ports;

And receiving fourth optical signals from a plurality of groups of optical path components of the optical network unit through the second ports, combining the fourth optical signals into one path of second optical signals, and transmitting the second optical signals to the at least one optical line terminal through the first ports.

In some embodiments, the expansion head further includes a branching sub-module and a plurality of wave combining sub-modules, the first port is connected with the branching sub-module, the branching sub-module is connected with the plurality of wave combining sub-modules, the plurality of wave combining sub-modules are respectively connected with the plurality of second ports, and a band group of operation of each second port is the same as a band group of operation of the wave combining sub-module connected with the second port;

the wave-dividing submodule is used for: receiving a first optical signal from the first port; the first optical signals are divided into multiple paths of third optical signals corresponding to the wave band groups of the multiple wave combination sub-modules, and the multiple paths of third optical signals are respectively sent to the corresponding wave combination sub-modules;

the wave synthesizing submodule is used for: transmitting the received one path of third optical signals to the corresponding second port;

Or alternatively

The wave synthesizing submodule is used for: receiving a fourth optical signal from a second port connected with the wave combining sub-module, and sending the fourth optical signal to the wave dividing sub-module;

The wave-dividing submodule is used for: multiplexing the multiple paths of fourth optical signals received by the multiplexing sub-modules into one path of second optical signals; and transmitting the second optical signal to the first port.

In some embodiments, the expansion head further comprises an optical branching module; the first port is connected with the optical branching module, and the optical branching module is respectively connected with the plurality of second ports;

The optical branching module is used for: receiving a first optical signal from the first port; splitting the first optical signal into multiple paths of third optical signals, and respectively transmitting the multiple paths of third optical signals to the multiple second ports;

Or alternatively

The optical branching module is used for: receiving fourth optical signals from the plurality of second ports, and combining the plurality of fourth optical signals into one path of second optical signals; and transmitting the second optical signal to the first port.

In some embodiments, the extension header is a user connector;

the first port of the user connector is a socket, and the second port of the user connector is a plug; or (b)

The first port of the user connector is a plug, and the second port of the user connector is a socket.

In a fourth aspect, an embodiment of the present application provides a networking system of a passive optical network, where the networking system includes an optical splitter, an optical line terminal, and an optical network unit; the optical network unit is optically connected with the optical line terminal through the optical splitter;

the optical line terminal comprises a first optical line terminal and/or a second optical line terminal; the first optical line terminal is any optical line terminal provided in the first aspect; the optical module configured on the second optical line terminal comprises a group of optical path components, the wave band group of the work of the group of optical path components is a preset standard wave band group, and the work bandwidth of the group of optical path components is a preset standard bandwidth;

The optical network unit comprises a first optical network unit and/or a second optical network unit; the first optical network unit is any one of the optical network units provided in the second aspect; a group of optical path components are configured on the port of the second optical network unit, the wave band group of the operation of the group of optical path components is a preset standard wave band group, and the operation bandwidth of the group of optical path components is a preset standard bandwidth;

The networking system comprises at least one of the first optical line terminal and the first optical network unit.

In some embodiments, the networking system further comprises any of the extension heads provided in the third aspect above;

the first port of the expansion head is optically connected with the optical line terminal through an optical splitter; and the second port of the expansion head is optically connected with a plurality of groups of optical path components of the second optical network unit.

In some embodiments, part or all of the multiple optical path components included in the first optical network unit are connected to the optical splitter; and/or

And part or all of the multipath light path components included in the light module of the first light line end are connected with the light splitter.

The embodiment of the application has the beneficial effects that:

in the technical scheme provided by the embodiment of the application, the optical module of one OLT comprises a plurality of optical path components, the working bandwidths of the plurality of optical path components are all preset standard bandwidths, and the working wave bands of the plurality of optical path components are different. In this way, multiple data paths are implemented in a single physical path, and accordingly, an optical module (i.e., port) of an OLT can provide one, two or more times of preset standard bandwidth according to the bandwidth requirement of the user. The low-bandwidth optical path component can be used for meeting different bandwidth requirements of more ONUs under the condition of not changing the original port density of the OLT single board, and particularly meeting higher bandwidth requirements of more ONUs without adopting the high-bandwidth optical path component. The cost of the high-bandwidth optical path component is far higher than that of the low-bandwidth optical path component, so that the technical scheme provided by the embodiment of the application solves the problem of excessive bandwidth based on lower cost.

Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.

Fig. 1 is a schematic diagram of a networking of a PON;

fig. 2 is a schematic diagram of a first structure of an OLT according to an embodiment of the present application;

fig. 3 is a schematic diagram illustrating an improvement of an optical module of an OLT according to an embodiment of the present application;

Fig. 4 is a schematic diagram of a second structure of an OLT according to an embodiment of the present application;

Fig. 5 is a schematic diagram of a first configuration of an ONU according to an embodiment of the present application;

Fig. 6 is a schematic diagram of a second structure of an ONU according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a first configuration of an expansion head according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a second structure of an expansion head according to an embodiment of the present application;

Fig. 9 to 15 are schematic structural diagrams of a networking according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.

For ease of understanding, the words appearing in the embodiments of the application are explained below.

Active optical network (Active Optical Network: AON): in the transmission process of the signals, a network for transmitting the signals from the local side equipment to the user distribution unit by adopting active optical fiber transmission equipment such as photoelectric conversion equipment, active photoelectric devices and optical fibers is adopted. Among them, active optical devices include a light source (laser), an optical receiver, an optical transceiver module, an optical amplifier (optical fiber amplifier and semiconductor optical amplifier), and the like.

Passive optical network (Passive Optical Network, PON): the optical distribution network (Optical Distribution Network, ODN) is composed of passive devices such as optical splitters (splitters) and the like without any electronic devices or electronic power sources, and expensive active optical devices are not needed. The PON may include an Optical splitter, an Optical line terminal (Optical LINE TERMINAL, OLT), and an Optical network unit (Optical Network Unit, ONU), the OLT being installed in a central control station, and the ONU being installed in a customer premises, such as the PON shown in fig. 1.

ODN: fiber To The Home (FTTH) cable network based on PON devices such as OLT and ONU. The ODN functions to provide an optical transmission channel between the OLT and the ONUs.

Port density: the number of ports included on the service board of one OLT. In the embodiment of the application, one OLT may include a plurality of service boards, and one service board may include at most 24 ports. One port (i.e., an OLT veneer port) may connect multiple ONUs, for example, one OLT veneer port may connect up to 64 ONUs.

Currently, the bandwidth of the PON is directly upgraded from a 10G PON to a 50G PON, and when an access network is set up, there is a problem of excessive bandwidth. In order to solve the problem of excessive bandwidth, an embodiment of the present application provides an OLT, as shown in fig. 2, an optical module 21 is configured on the OLT 1, and the optical module 21 is connected to at least one ONU 3 through an optical splitter 2. The optical module 21 includes a plurality of groups of optical path components 211, the wavelength band groups of the plurality of groups of optical path components 211 are different, and the working bandwidth of the plurality of groups of optical path components 211 is a preset standard bandwidth.

An optical path component 211 for converting the first electrical signal into a first optical signal and transmitting the first optical signal to at least one ONU 3; or, by receiving the second optical signal transmitted by the at least one ONU 3, the second optical signal is converted into a second electrical signal.

In the technical scheme provided by the embodiment of the application, the optical module of one OLT comprises a plurality of optical path components, the working bandwidths of the plurality of optical path components are all preset standard bandwidths, and the working wave bands of the plurality of optical path components are different. In this way, multiple data paths are implemented on a single physical path, and accordingly, an optical module (i.e., port) of an OLT can provide one, two or more times of preset standard bandwidth according to the bandwidth requirement of the user. The low-bandwidth optical path component can be used for meeting different bandwidth requirements of more ONUs under the condition of not changing the original port density of the OLT single board, and particularly meeting higher bandwidth requirements of more ONUs without adopting the high-bandwidth optical path component. The cost of the high-bandwidth optical path component is far higher than that of the low-bandwidth optical path component, so that the technical scheme provided by the embodiment of the application solves the problem of excessive bandwidth based on lower cost.

In the embodiment of the present application, the band groups in which different optical path components 211 operate are different. Band groups may be divided into uplink bands and downlink bands. The optical module 21 may include 2 sets of optical path components 211.

The optical path assembly 211 may operate in two band groups as follows.

First band group (band group 1): the upstream wave band is 1260 nm-1280 nm, and the downstream wave band is 1575 nm-1580 nm.

Such a band group can be used as a band group for 10G PON operation such as XGSPON and 10G EPON.

Second band group (band group 2): the upstream wave band is 1300 nm-1320 nm, and the downstream wave band is 1480 nm-1500 nm.

Such a band group may operate as a band of a Gigabit PON (GPON).

The optical module 21 includes two sets of optical path components 211, and the two sets of optical path components may be directly used, for example, one set of optical path components 211 operates in a first band set and the other set of optical path components 211 operates in a second band set. In this way, the 2 groups of optical path components 211 included in the optical module 21 can directly multiplex the two existing band groups, thereby reducing the reconstruction cost of the optical module 21.

In the embodiment of the present application, the number of groups of the optical path components 211 included in the optical module 21 may be 3,4, or 5, which is not limited. When the number of groups of the optical path components 211 included in the optical module 21 is greater than 2, a new band group may be added on the basis of the above two band groups in order to reduce the influence on the existing network. For example, a third band group is added, wherein the uplink band is 1330 nm-1350 nm, and the downlink band is 1510 nm-1550 nm.

In the embodiment of the present application, the working bandwidth of the optical path component 211 is a preset standard bandwidth. In order to reduce the modification cost of the optical module 21 and to adapt to the development of the current network technology, the preset standard bandwidth may be 10G.

When the number of the optical path components 211 included in the optical module 21 is 2 and the preset standard bandwidth is 10G, as shown in the circle part of fig. 3, the optical module 21 in the embodiment of the present application can be implemented only by increasing the gigabit bandwidth supported by the second band group to 10G bandwidth, which can maximally reduce the reconstruction cost of the optical module 21. The modified optical module shown in fig. 3 is an optical module supporting 2×10g XGSPON (EPON compliant).

In addition, when the preset standard bandwidth is 10G, one optical module (i.e., one port) of the OLT can provide a bandwidth of 20G. In this way, if the 10G PON is adopted to build the access network, the bandwidth of the access network cannot be met, and the 50G PON is adopted to build the access network, so that the problem of excessive bandwidth exists, the OLT equipment provided by the embodiment of the application can be adopted, the access bandwidth of the port is improved under the condition that the port density of the OLT single board is not changed, and further, the bandwidth requirement of more ONUs with bandwidths between 10G and 50G is met, and the cost is reduced.

For example, up to 64 ONUs may be connected to one OLT veneer port. For an ONU with a 20G bandwidth requirement, the original access bandwidth of the OLT veneer port is 10G, so that to meet the bandwidth requirement of the ONU, the ONU needs to occupy 2 ports, and the corresponding OLT veneer with 24 ports can only access 24×64/2=768 ONUs. By adopting the OLT provided by the embodiment of the present application, the access bandwidth of the single-board port is 20G, the ONU can meet the bandwidth requirement of the ONU only by occupying 1 port, and the corresponding OLT single-board with 24 ports can access 24×64=1536 ONUs.

The preset standard bandwidth may also be other values, such as 1.25G, 2.5G, etc., which are not limited.

In an embodiment of the application, the optical path assembly 211 may include one or more of a light emitting subassembly (TRANSMITTER OPTICAL SUBASSEMBLY, TOSA) 2111 and a light receiving subassembly (Receiver Optical Subassembly, ROSA) 2112. The TOSA 2111 operates in the downlink band and the ROSA 2112 operates in the uplink band. When the optical path assembly 211 includes both TOSA 2111 and ROSA 2112, the optical path assembly 211 may also be referred to as a bi-directional optical subassembly (Both Optical Subassembly, BOSA). TOSA 2111 and ROSA 2112 may be implemented as circuits formed by clock data recovery (Clock and Data Recovery, CDR) driving devices, resistors, capacitors, diodes, combiners (MUXs), etc., and the optical path assembly 211 is simplified in fig. 3 without limitation. The MUX is configured to combine the optical signals (such as the first optical signals) sent by the multiple groups of optical path components 211 into one path, and send the combined optical signals to the ONU 3; the MUX is further configured to split the optical signals (such as the second optical signals) of the multiple bands sent by the ONU 3 into multiple paths, and send the multiple paths to the multiple groups of optical path components 211.

The TOSA 2111 converts an electrical signal (e.g., a first electrical signal) into an optical signal (e.g., a first optical signal) and sends the first optical signal to at least one ONU 3 through the optical splitter 2. Wherein the wavelength of the first optical signal is located in the downstream wavelength band.

The ROSA 2112 receives an optical signal (e.g., a second optical signal) sent by at least one ONU 3 through the optical splitter 2, and converts the second optical signal into an electrical signal (e.g., a second electrical signal). Wherein the wavelength of the second optical signal is located in the upstream wavelength band.

In the embodiment of the application, the CDR driving device is used for extracting the clock signal from the signal transmitted to the optical module and acquiring the correlation between the clock signal and the data.

The OLT 1 may further include other components, such as a Physical (PHY) component 22, a resistor, a capacitor, and the like, as shown in fig. 4, and the circuit configuration is simplified in fig. 4, which is not intended to be limiting. The PHY component 22 is used to transmit multiple electrical signals to the optical module 21, or receive multiple electrical signals transmitted by the optical module 21, or the like. In fig. 4, the PHY component 22 is exemplified by two data paths, such as one data path for transmit data 1 (TXD 1) and receive data 1 (RXD 1), and one data path for transmit data 2 (TXD 2) and receive data 2 (RXD 2). PHY component 22 may also include more data paths, only two paths being shown in fig. 4 as an example and not by way of limitation.

In the embodiment of the present application, the OLT 1 and the optical splitter 2 may be directly or indirectly connected through an optical fiber, and the optical splitter 2 and the ONU 3 may be directly or indirectly connected through an optical fiber, for example, an extension head may be inserted between the optical splitter 2 and the ONU 3, which is not limited. The structure of the extension head will be described in detail later, and will not be described here.

Corresponding to the OLT, the embodiment of the present application further provides an ONU, as shown in fig. 5, where an ONU 3 is optically connected to at least one OLT 1 through an optical splitter 2; a plurality of groups of optical path components 31 are configured on the port of the ONU 3 connected with the optical splitter 2; the band groups in which the plurality of optical path components 31 operate are different, and the operating bandwidths of the plurality of optical path components 31 are preset standard bandwidths.

An optical path component 31 for converting the second electrical signal into a second optical signal and transmitting the second optical signal to the at least one OLT 1; or, the first optical signal sent by the at least one OLT 1 is received, and the first optical signal is converted into a first electrical signal.

In the technical scheme provided by the embodiment of the application, one ONU port comprises a plurality of paths of optical path components, the working bandwidths of the paths of optical path components are all preset standard bandwidths, and the working wave bands of the paths of optical path components are different. Thus, multiple data paths are realized in a single physical path, and accordingly, one port can provide one, two or more times of preset standard bandwidth according to the bandwidth requirement of a user. The optical path component with low bandwidth is adopted to meet different bandwidth requirements of more ONUs under the condition of not changing the original port density of the OLT single board, and particularly meets higher bandwidth requirements of more ONUs.

In the embodiment of the present application, the band groups in which different optical path components 31 on one port operate are different. The number of sets of optical path components 31 on one port may be 2. The optical path assembly 211 may operate in two band groups, such as the first band group and the second band group described above.

The two sets of optical path components 31 may be directly used in the two band sets, for example, one set of optical path components 31 operates in the first band set and the other set of optical path components 31 operates in the second band set. Thus, the 2-group optical path component 31 can directly multiplex the two existing band groups, and the reconstruction cost of the ONU ports is reduced.

In the embodiment of the present application, the number of groups of the optical path components 31 may be 3, 4, 5, or the like, which is not limited. When the number of the optical path components 31 is greater than 2, the two band groups can be finely divided to meet the different band groups of different optical path components 31, and the purpose of multiplexing data paths is realized on a single physical path.

In the embodiment of the present application, the working bandwidth of the optical path component 31 is a preset standard bandwidth. In order to reduce the reconstruction cost of the ONU ports and adapt to the development of the current network technology, the preset standard bandwidth may be 10G.

When the number of the optical path components 31 is 2 and the preset standard bandwidth is 10G, as shown in fig. 6, the ports in the embodiment of the present application can be implemented only by increasing the gigabit bandwidth supported by the second band group to 10G bandwidth, which can maximally reduce the reconstruction cost of the ONU ports.

In embodiments of the present application, the optical path assembly 31 may include one or more of TOSA and ROSA. Wherein the TOSA operates in the downlink band and the ROSA 312 operates in the uplink band. When the optical path assembly 31 includes both TOSA and ROSA, the optical path assembly 31 may also be referred to as BOSA, such as BOSA 311 and BOSA 312 shown in fig. 6. BOSA 311 operates in band group 1 and BOSA 312 operates in band group 2.

In the optical path component 31, the TOSA converts an electrical signal (e.g., a second electrical signal) into an optical signal (e.g., a second optical signal), and then sends the second optical signal to the at least one OLT 1 through the optical splitter 2. Wherein the wavelength of the second optical signal is located in the upstream wavelength band.

In the optical path assembly 31, the ROSA receives an optical signal (e.g., a first optical signal) sent by at least one OLT 1 through the optical splitter 2, and converts the first optical signal into an electrical signal (e.g., a first electrical signal). Wherein the wavelength of the first optical signal is located in the downstream wavelength band.

In addition, the optical path component 31 may be directly fixed on a board of the ONU 3, so as to accurately control the connection performance between the ONU 3 and the optical splitter 2. To facilitate maintenance of the optical port, the optical path component 31 may also be removably mounted on a board of the ONU 3 in the form of an optical module. This is not limited.

In the embodiment of the present application, the ONU may further include other components to implement corresponding functions, which is not limited.

Corresponding to the OLT and the ONUs, the embodiment of the present application further provides an extension head, as shown in fig. 7, where the extension head 4 is configured with a first port 41 and a plurality of second ports 42, the first port 41 of the extension head 4 is optically connected to the at least one OLT 1 through the optical splitter 2, and the plurality of second ports 42 of the extension head 4 are respectively optically connected to the plurality of groups of optical path components 31 of the ONUs 3; the band group in which the second port 42 operates is the same as the band group in which the optical path assembly 31 to which the second port 42 is connected operates.

The expansion head 4 and the optical splitter 2 can be connected through optical fibers, or the expansion head 4 is directly connected into the optical splitter 2 in a plug/socket mode; the extension header 4 and the ONU 3 may be connected by an optical fiber, or the extension header 4 directly accesses the ONU 3 in a plug/socket manner. The expansion head 4 is used for:

Receiving a first optical signal from at least one OLT 1 through a first port 41, dividing the first optical signal into multiple third optical signals, and respectively transmitting the multiple third optical signals to multiple groups of optical path components 31 of an ONU 3 through multiple second ports 42;

the fourth optical signals from the multiple groups of optical path components 31 of the ONU 3 are received through the multiple second ports 42, the multiple fourth optical signals are combined into one second optical signal, and the second optical signal is sent to the at least one OLT 1 through the first port 41.

In the embodiment of the present application, the first optical signal received by the expansion head 4 through the first port 41 may actually include multiple optical signals from the multiple groups of optical path components 211 of the OLT 1, where only the expansion head 4 receives the multiple optical signals through one physical path, and the expansion head 4 is regarded as a first optical signal. In addition, the second optical signal transmitted by the expansion head 4 through the first port 41 may actually include multiple optical signals from the multiple optical path assembly 31, and only the expansion head 4 transmits the multiple optical signals through one physical path, and is regarded as one second optical signal by the expansion head 4.

In the technical scheme provided by the embodiment of the application, a plurality of groups of optical path components on the ONU can work simultaneously through the extension head, so that the requirements of bandwidth improvement and port standby are met. In addition, through the extension head, on the basis of original optical splitter 2, divide into multichannel optical signal with each way optical signal that optical splitter 2 outputted further, so, an ONU3 need not to occupy the multichannel optical signal that optical splitter 2 outputted, under the circumstances that does not change optical splitter 2 beam split ratio, increase the ONU quantity of inserting, enlarge the network deployment.

In embodiments of the application, the extension header may employ a subscriber connector (Subscriber Connector, SC). The SC may be implemented in any of the following ways.

In one mode, the first port of the SC is a socket, and the second port of the SC is a plug, as shown in fig. 7.

In the second mode, the first port of the SC is a plug, and the second port of the SC is a socket.

The SC may also be implemented in other manners, for example, the first port and the second port of the SC are both sockets, or the first port and the second port of the SC are both plugs, which is not limited.

In the embodiment of the present application, as shown in fig. 8, the extension head 4 may further include a branching sub-module 43 and a plurality of combining sub-modules 44, where the first port 41 is connected to the branching sub-module 43, the branching sub-module 43 is connected to the plurality of combining sub-modules 44, the plurality of combining sub-modules 44 are respectively connected to the plurality of second ports 42, and a band group of each second port 42 works the same as a band group of the combining sub-modules 44 connected to the second port 42;

when data is transmitted in the downlink:

The sub-module 43 is for: receiving a first optical signal from a first port 41; the first optical signals are divided into multiple paths of third optical signals corresponding to the wave band groups of the multiple wave combination sub-modules, and the multiple paths of third optical signals are respectively sent to the wave combination sub-modules connected with the corresponding second ports;

the wave synthesizing submodule 44 is configured to: and sends the received third optical signal to the corresponding second port 42. The second port 41 transmits a second optical signal to the ONU.

When data is transmitted in the uplink direction:

the wave synthesizing submodule 44 is configured to: receiving a fourth optical signal from the second port 42 connected to the multiplexer sub-module 44, and transmitting the fourth optical signal to the demultiplexer sub-module 43;

the sub-module 43 is for: multiplexing the multiple fourth optical signals received by the multiple multiplexing submodules 44 into a second optical signal; and sends a second optical signal to the first port 41. The first port 41 transmits the second optical signal to the OLT.

The above-mentioned wave combining sub-module 44 and the wave combining sub-module 44 can realize the wave division and the wave combination of the optical signals by the optical principles such as optical refraction and filtering, so that the uplink optical signals and the downlink optical signals of one group of optical path components of the ONU are transmitted on one physical path, and the uplink optical signals and the downlink optical signals of multiple groups of optical path components of the multiple OLTs are transmitted on one physical path.

In fig. 7 and 8, only two second ports 42 are illustrated, and the two second ports 42 respectively operate in the band group 1 and the band group 2, which is not limited thereto.

In the embodiment of the application, when the distance between the wave band groups of the multi-group optical path components of the ONU/the multi-group optical path components of the OLT is larger than the preset distance threshold, the interference between the optical signals processed by the multi-group optical path components is smaller and can be ignored; the optical path component can accurately process the received optical signal. In this case, in order to reduce the cost of the expansion head and to expand the networking, the expansion head may be configured with an optical branching module without configuring a combining and branching component (such as the above-described branching sub-module and combining sub-module).

At this time, when data is transmitted in the downlink:

The optical branching module is used for: receiving a first optical signal from a first port 41; the first optical signal is split into multiple third optical signals, and the multiple third optical signals are sent to the multiple second ports 42, respectively. The second port 41 transmits a second optical signal to the ONU.

When data is transmitted in the uplink direction:

the optical branching module is used for: receiving fourth optical signals from the plurality of second ports 42, and combining the plurality of fourth optical signals into one path of second optical signals; and sends a second optical signal to the first port 41. The first port 41 transmits the second optical signal to the OLT.

In the embodiment of the application, in order to further reduce the networking cost, when the optical splitter 2 has larger optical splitting ratio and even has an idle port for connecting with the ONU, and the distance between the band groups of the work of the plurality of groups of optical path components is greater than the preset distance threshold, the expansion head can be omitted in networking. The preset distance threshold can be set according to actual requirements. For example, the preset distance threshold may be 10nm, 15nm, 20nm, or the like.

The OLT and the ONU provided by the embodiment of the application can be mixed with the OLT and the ONU in the related technology for networking, so that the networking flexibility is improved. Based on this, the networking system of the PON includes an optical splitter, an OLT, and an ONU; the ONU is optically connected with the OLT through an optical splitter.

The OLT comprises a first OLT and/or a second OLT; the first OLT (a novel OLT described later) is any OLT described in the embodiment section shown in fig. 2 to fig. 4; the optical module configured on the second OLT (e.g., a standard OLT described later) includes a set of optical path components, a band set in which the set of optical path components operate is a preset standard band set, and an operating bandwidth of the set of optical path components is a preset standard bandwidth;

The ONU comprises a first ONU and/or a second ONU; the first ONU (a new ONU as described later) is any ONU described in the embodiment section shown in fig. 5 to 6; a group of optical path components are configured on a port of a second ONU (such as a standard ONU described later), a wave band group of the operation of the group of optical path components is a preset standard wave band group, and the operation bandwidth of the group of optical path components is a preset standard bandwidth;

the networking system comprises at least one of a first OLT and a first ONU. The preset standard band group may be the first band group (band group 1) or the second band group (band group 2), which is not limited.

In some embodiments, the networking system may further include any of the extension heads described in the embodiments section shown in fig. 7-8; the first port of the expansion head is optically connected with the OLT through an optical splitter; the second port of the expansion head is optically connected with the plurality of groups of optical path components of the second ONU.

In some embodiments, the first ONU includes a plurality of optical path components, some or all of which are connected to the optical splitter. And part or all of the multipath optical path components included in the optical module of the first OLT are connected with the optical splitter. That is, a part of the optical path components that the first ONU may be used, and a part of the optical path components are not used.

That is, a part of the optical path components that the first ONU and the first OLT may be used, and a part of the optical path components are not used. This increases the flexibility of networking.

The networking system provided by the embodiment of the application is described in detail below with reference to the PON networking system architecture shown in fig. 9 to 15. In fig. 9 to 15, a standard OLT and a standard ONU are an OLT and an ONU in the related art, and a novel OLT and a novel ONU are the OLT and the ONU provided by the embodiment of the present application. The standard OLT operates in band group 1, supporting XGSPON and 10G EPONs. BOSA is an optical path component.

Fig. 9 is a network of a standard OLT and a new ONU. In the networking, the splitting ratio of the optical splitter is 1: m, namely the optical splitter can divide one path of optical signal into N paths of optical signals, and the standard OLT is connected with M novel ONUs, such as novel ONU-1-novel ONU-M in FIG. 9.

In this networking, the new ONU may be used singly, i.e. one BOSA is not used, e.g. BOSA of band group 1 in fig. 9 is used, and BOSA of band group 2 is not used. This approach does not affect the use of PON in the related art.

Fig. 10 is a network of a new OLT and a standard ONU. In the networking, the splitting ratio of the optical splitter is 1: n, namely the optical splitter can divide one path of optical signal into N paths of optical signals, and the novel OLT is connected with N standard ONUs, such as standard ONU-1-standard ONU-N in fig. 10.

In this networking, the novel OLT may be used singly, i.e., one optical path component of the novel OLT is not used, for example, the optical path component of the band group 1 in fig. 10 is used, and the optical path component of the band group 2 is not used. This approach does not affect the use of PON in the related art.

Fig. 11 is a network of a standard OLT, a new ONU, and a standard ONU. In the networking, the splitting ratio of the optical splitter is 1: N+M, namely the optical splitter can divide one path of optical signal into N+M paths of optical signals, and the standard OLT is connected with N standard ONUs and M novel ONUs, such as novel ONU-1-novel ONU-M, and standard ONU-1-standard ONU-N in FIG. 11.

In this networking, the new ONU may be used singly, i.e. one optical path component of the new ONU is not used, e.g. the BOSA of the band group 1 in fig. 11 is used, and the BOSA of the band group 2 is not used. This approach does not affect the use of PON in the related art.

Fig. 12 is a network of a new OLT and a new ONU. In the networking, the splitting ratio of the optical splitter is 1: m, namely the optical splitter can divide one path of optical signal into M paths of optical signals, and the novel OLT is connected with M novel ONUs, such as novel ONU-1-novel ONU-M in FIG. 12.

In this networking, the novel ONU can be used in dual-upstream, that is, two BOSAs are used, as in fig. 12, the optical splitter divides the optical signal of the band group 1 into M optical signals, the optical splitter divides the optical signal of the band group 2 into M optical signals, the optical signal of the band group 1 and the optical signal of the band group 2 send into the expansion head through a physical channel, the expansion head distributes the received optical signals into two optical signals, and send into corresponding BOSAs respectively, so as to realize the upstream bandwidth of 20G. This way the access bandwidth of the ONU is improved.

Fig. 13 is a network of a new OLT, a new ONU, and a standard ONU. In the networking, the splitting ratio of the optical splitter is 1: N+M, namely the optical splitter can divide one optical signal of the band group 1 into N+M optical signals, the optical splitter can divide one optical signal of the band group 2 into M optical signals, and the novel OLT is connected with N standards NOU and M novel ONUs, such as novel ONU-1-novel ONU-M, standard ONU-1-standard ONU-N in FIG. 13.

In this network deployment, the novel ONU can be used in double-up mode, namely, two BOSAs are used, as in FIG. 13, the optical splitter divides the optical signal of the band group 1 into N+M paths of optical signals, the optical splitter divides the optical signal of the band group 2 into M paths of optical signals, the optical signal of the band group 1 and the optical signal of the band group 2 are sent into the expansion head through a physical channel, the expansion head distributes the received optical signals into two paths of optical signals, and the two paths of optical signals are respectively sent into corresponding BOSAs, so that the 20G uplink bandwidth of the novel ONU is realized. The method improves the access bandwidth of the ONU and does not influence coexistence with the standard ONU.

Fig. 14 is a network of a plurality of novel OLTs and novel ONUs. In the networking, the splitting ratio of the optical splitter is 1: m. Referring to the related description of fig. 12, the networking can realize the uplink bandwidth of 20G, thereby improving the access bandwidth of the ONU. In addition, the optical path components of the two novel OLTs can form a group of main-standby relations, the Type-B networking is realized, and the networking safety is improved.

In addition, in the networking mode, a policy can be added at the OLT side to realize Type-D networking, so that the networking safety is further improved.

Fig. 15 is a network of a plurality of novel OLTs and novel ONUs. The group network has deployed 2 optical splitters. The splitting ratio of the optical splitter is 1: m,2 novel OLTs are respectively through 2 optical splitters and M novel ONU cross connection, like novel ONU-1~ novel ONU-M in FIG. 15, and one novel OLT is connected with the BOSA of the wave band group 1 of M novel ONU through an optical splitter, and another novel OLT is connected with the BOSA of the wave band group 2 of M novel ONU through another optical splitter. At this time, one novel OLT operates in band group 1 and the other novel OLT operates in band group 2.

The networking can realize the uplink bandwidth of 20G, and improves the access bandwidth of the ONU. In addition, the optical path components of the two novel OLTs can form a group of main-standby relations through the two optical splitters, the Type-D networking is realized, and the networking safety is improved.

The expansion header in fig. 12 to 14 may be omitted, and when the expansion header is omitted, the two BOSAs of the new ONU are directly connected to the optical splitter.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (15)

1. An optical line terminal is characterized in that an optical module is configured on the optical line terminal, and the optical module is optically connected with at least one optical network unit through an optical splitter;

The optical module comprises a plurality of groups of optical path components, the wave band groups of the plurality of groups of optical path components are different, and the working bandwidth of the plurality of groups of optical path components is a preset standard bandwidth;

the optical path component is used for converting a first electric signal into a first optical signal and transmitting the first optical signal to the at least one optical network unit; or, receiving a second optical signal sent by the at least one optical network unit, and converting the second optical signal into a second electrical signal.

2. The optical line terminal of claim 1, wherein the optical path component comprises an optical transmit subassembly and an optical receive subassembly; the light emitting subassembly operates in a downstream band and the light receiving subassembly operates in an upstream band.

3. The optical line terminal of claim 1, wherein the number of sets of the plurality of sets of optical path components is 2.

4. An optical line terminal according to any one of claims 1-3, wherein the preset standard bandwidth is 10G.

5. An optical network unit, wherein the optical network unit is optically connected with at least one optical line terminal through an optical splitter; a plurality of groups of optical path components are configured on the port of the optical network unit connected with the optical splitter;

the wave band groups of the operation of the plurality of groups of light path components are different, and the operation bandwidth of the plurality of groups of light path components is a preset standard bandwidth;

the optical path component is used for converting a second electric signal into a second optical signal and transmitting the second optical signal to the at least one optical line terminal; or, receiving a first optical signal sent by the at least one optical line terminal, and converting the first optical signal into a first electrical signal.

6. The optical network unit of claim 5, wherein the optical path component comprises an optical transmit subassembly and an optical receive subassembly; the optical transmitting subassembly operates in an upstream band, and the optical receiving subassembly operates in a downstream band.

7. The optical network unit according to claim 5, wherein the number of sets of the plurality of sets of optical path components is 2.

8. An optical network unit according to any of claims 5-7, wherein the preset standard bandwidth is 10G.

9. An expansion head, characterized in that it is provided with a first port optically connected to at least one optical line terminal according to any one of claims 1-4 via an optical splitter and a plurality of second ports optically connected to a plurality of sets of optical path components of an optical network unit according to any one of claims 5-8, respectively; the wave band group of each second port works is the same as the wave band group of the optical path component connected with the second port;

The extension head is used for:

Receiving a first optical signal from the at least one optical line terminal through the first port, dividing the first optical signal into multiple paths of third optical signals, and respectively sending the multiple paths of third optical signals to multiple groups of optical path components of the optical network unit through the multiple second ports;

And receiving fourth optical signals from a plurality of groups of optical path components of the optical network unit through the second ports, combining the fourth optical signals into one path of second optical signals, and transmitting the second optical signals to the at least one optical line terminal through the first ports.

10. The extension head of claim 9, further comprising a branching sub-module and a plurality of combining sub-modules, wherein the first port is connected to the branching sub-module, the branching sub-module is connected to the plurality of combining sub-modules, the plurality of combining sub-modules are respectively connected to the plurality of second ports, and a band group in which each second port operates is the same as a band group in which the combining sub-module connected to the second port operates;

the wave-dividing submodule is used for: receiving a first optical signal from the first port; the first optical signals are divided into multiple paths of third optical signals corresponding to the wave band groups of the multiple wave combination sub-modules, and the multiple paths of third optical signals are respectively sent to the corresponding wave combination sub-modules;

the wave synthesizing submodule is used for: transmitting the received one path of third optical signals to the corresponding second port;

Or alternatively

The wave synthesizing submodule is used for: receiving a fourth optical signal from a second port connected with the wave combining sub-module, and sending the fourth optical signal to the wave dividing sub-module;

The wave-dividing submodule is used for: multiplexing the multiple paths of fourth optical signals received by the multiplexing sub-modules into one path of second optical signals; and transmitting the second optical signal to the first port.

11. The extension head of claim 9, further comprising an optical branching module; the first port is connected with the optical branching module, and the optical branching module is respectively connected with the plurality of second ports;

The optical branching module is used for: receiving a first optical signal from the first port; splitting the first optical signal into multiple paths of third optical signals, and respectively transmitting the multiple paths of third optical signals to the multiple second ports;

Or alternatively

The optical branching module is used for: receiving fourth optical signals from the plurality of second ports, and combining the plurality of fourth optical signals into one path of second optical signals; and transmitting the second optical signal to the first port.

12. The extension head according to any one of claims 9-11, wherein the extension head is a user connector;

the first port of the user connector is a socket, and the second port of the user connector is a plug; or (b)

The first port of the user connector is a plug, and the second port of the user connector is a socket.

13. The networking system of the passive optical network is characterized by comprising an optical splitter, an optical line terminal and an optical network unit; the optical network unit is optically connected with the optical line terminal through the optical splitter;

The optical line terminal comprises a first optical line terminal and/or a second optical line terminal; the first optical line terminal is an optical line terminal according to any one of claims 1-4; the optical module configured on the second optical line terminal comprises a group of optical path components, the wave band group of the work of the group of optical path components is a preset standard wave band group, and the work bandwidth of the group of optical path components is a preset standard bandwidth;

The optical network unit comprises a first optical network unit and/or a second optical network unit; the first optical network unit being an optical network unit according to any one of claims 5-8; a group of optical path components are configured on the port of the second optical network unit, the wave band group of the operation of the group of optical path components is a preset standard wave band group, and the operation bandwidth of the group of optical path components is a preset standard bandwidth;

The networking system comprises at least one of the first optical line terminal and the first optical network unit.

14. The networking system of claim 13, further comprising an extension head of any of claims 9-12;

the first port of the expansion head is optically connected with the optical line terminal through an optical splitter; and the second port of the expansion head is optically connected with a plurality of groups of optical path components of the second optical network unit.

15. The networking system of claim 13, wherein some or all of the multiple optical path components included in the first optical network unit are connected to the optical splitter; and/or

And part or all of the multipath light path components included in the light module of the first light line end are connected with the light splitter.