CN116707697A - Optical communication method, device and system - Google Patents

Optical communication method, device and system Download PDF

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Publication number
CN116707697A
CN116707697A CN202210193220.5A CN202210193220A CN116707697A CN 116707697 A CN116707697 A CN 116707697A CN 202210193220 A CN202210193220 A CN 202210193220A CN 116707697 A CN116707697 A CN 116707697A
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China
Prior art keywords
optical
optical signal
communication device
wavelength
optical communication
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Chinese (zh)
Inventor
刘翔
王红启
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202210193220.5A priority Critical patent/CN116707697A/en
Priority to PCT/CN2023/077149 priority patent/WO2023160493A1/en
Publication of CN116707697A publication Critical patent/CN116707697A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0215—Architecture aspects
    • H04J14/0216—Bidirectional architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

The application provides an optical communication method which is applied to the field of optical communication. The optical communication method comprises the following steps: the first optical communication device acquires a first mode division multiplexed optical signal and a first wavelength division multiplexed optical signal. And the first optical communication equipment performs beam combination on the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexing optical signal. The first optical communication device transmits the first multiplexed optical signal to the second optical communication device via the first optical fiber. The first optical fiber is a multimode optical fiber or a few-mode optical fiber. The wavelength of the first wavelength division multiplexed optical signal is greater than the cutoff wavelength of the first optical fiber. The wavelength of the first mode division multiplexed optical signal is less than the cutoff wavelength of the first optical fiber. In the application, the mode division multiplexing optical signal and the wavelength division multiplexing optical signal are transmitted through one optical fiber, so that the communication bandwidth can be improved.

Description

Optical communication method, device and system
Technical Field
The present application relates to the field of optical communications, and in particular, to an optical communication method, apparatus, and system.
Background
Optical copper back-off is a trend in the development of communications. By using fiber optic communications, communications costs can be effectively reduced and communications bandwidth can be increased.
The optical fiber can transmit optical signals of different wave bands. The international telecommunications union (International Telecommunication Union, ITU) telecommunications standardization sector divides the bands of optical fiber communications. The bands include an O band, an E band, an S band, and the like. When an optical fiber transmits an optical signal greater than a cutoff wavelength, the optical fiber can transmit only one mode of optical signal. For example, when the S-band is greater than the cut-off wavelength of the optical fiber, the optical fiber can transmit an optical signal of the S-band only through one mode. At this time, the communication bandwidth can be increased by wavelength division multiplexing (wavelength division multiplexing, WDM).
However, as communication data increases, how to further increase the communication bandwidth is an urgent problem to be solved.
Disclosure of Invention
The application provides an optical communication method, an optical communication device and an optical communication system, which can improve communication bandwidth by transmitting a mode division multiplexing optical signal and a wavelength division multiplexing optical signal through one optical fiber.
The first aspect of the present application provides an optical communication method. The optical communication method comprises the following steps: the first optical communication device acquires a first mode division multiplexed optical signal and a first wavelength division multiplexed optical signal. The first mode-division multiplexed optical signal may include one or more modes of optical signals. And the first optical communication equipment performs beam combination on the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexing optical signal. The first optical communication device transmits the first multiplexed optical signal to the second optical communication device via the first optical fiber. The first optical fiber is a multimode optical fiber or a few-mode optical fiber. The wavelength of the first wavelength division multiplexed optical signal is greater than the cutoff wavelength of the first optical fiber. The wavelength of the first mode division multiplexed optical signal is less than the cutoff wavelength of the first optical fiber.
In an alternative form of the first aspect of the present application, the first optical communication device receives the first wavelength division multiplexed optical signal from the third optical communication device via the second optical fiber. The optical communication method further comprises the steps of: the first optical communication device receives the second multiplexed optical signal from the second optical communication device over the first optical fiber. The second multiplexed optical signal comprises a second wavelength division multiplexed optical signal. The first optical communication device transmits the second wavelength division multiplexed optical signal to the third optical communication device via the second optical fiber. Wherein, the utilization rate of the optical fiber can be effectively improved by bi-directionally transmitting the wavelength division multiplexing optical signals.
In an alternative form of the first aspect of the application, the second multiplexed optical signal further comprises a second mode division multiplexed optical signal. The first optical communication device is further configured to perform wavelength division on the second multiplexed optical signal to obtain a second mode division multiplexed optical signal and a second wavelength division multiplexed optical signal. The utilization rate of the optical fiber can be effectively improved by bi-directionally transmitting the wavelength division multiplexing optical signal and the mode division multiplexing optical signal.
In an alternative form of the first aspect of the present application, the optical communication method further comprises the steps of: the first optical communication device receives a third wavelength division multiplexed optical signal from a third optical communication device over a second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal of the first wavelength band. The first optical communication device transmits a first optical signal to the first wavelength processing device. The first optical communication device receives a second optical signal of the first wavelength band from the first wavelength processing device. The first wavelength division multiplexed optical signal includes a second optical signal. The first optical communication device can perform optical exchange with the first wavelength processing device, so that the flexibility of networking is improved.
In an alternative form of the first aspect of the application, the first wavelength processing device is any one of the following: optical add/drop multiplexer (OADM), reconfigurable optical add/drop multiplexer (ROADM), multiplexer (MUX), demultiplexer (DEMUX), a combination of MUX and DEMUX. The first optical communication device can perform optical exchange with the existing wavelength division multiplexing network, so that the flexibility of networking is improved.
In an alternative form of the first aspect of the present application, the third wavelength division multiplexed optical signal further comprises a third optical signal of the second wavelength band. And the first optical communication equipment performs wave combination on the second optical signal and the third optical signal to obtain a first wavelength division multiplexing optical signal. The first optical communication device can realize the direct connection of the optical signals of the second wave band, and can also realize the optical exchange of the optical signals of the first wave band with the first wavelength processing device. Therefore, the application can improve the flexibility of networking.
In an alternative form of the first aspect of the application, the third wavelength division multiplexed optical signal comprises a first optical supervisory channel (optical supervisory channel, OSC) optical signal. The first optical communication device is further configured to generate a second OSC optical signal from the first OSC optical signal. The first wavelength division multiplexed optical signal includes a second OSC optical signal. Wherein by adding the OSC optical signal, the signal quality of the third wavelength division multiplexed optical signal can be monitored, thereby improving the reliability of optical communication. The OSC optical signal may also be used to monitor the signal quality of the mode division multiplexed optical signal.
In an alternative form of the first aspect of the present application, the optical communication method further comprises the steps of: the first optical communication device receives the fifth wavelength division multiplexed optical signal from the third optical communication device via the third optical fiber. The first optical communication device transmits the fifth wavelength division multiplexed optical signal to the second optical communication device through the fourth optical fiber. Wherein a plurality of transmission optical fibers can be established between the second optical communication device and the third optical communication device. The first optical fiber is used for transmitting the multiplexed optical signal. The multiplexed optical signals include a mode division multiplexed optical signal and a wavelength division multiplexed optical signal. The third optical fiber and the fourth optical fiber are used only for transmitting the wavelength division multiplexed optical signal. Thus, the present application may provide flexibility in networking.
In an alternative form of the first aspect of the application, the second optical fibre is a single mode fibre. Wherein the cost of multimode fiber or few-mode fiber is higher than that of single-mode fiber. Also, in the present application, the second optical fiber may not need to transmit a mode division multiplexed optical signal. Therefore, by using a single mode optical fiber, the cost of optical communication can be reduced.
In an alternative form of the first aspect of the present application, the cut-off wavelength of the first optical fiber is between 1420 nanometers (nm) and 1500 nm. The first optical fiber in the application transmits the mode division multiplexing optical signal and the wavelength division multiplexing optical signal. In addition, in order to improve the reliability of networking, the wavelengths of the mode division multiplexing optical signal and the wavelength division multiplexing optical signal need to be relatively stable, that is, the cut-off wavelength of the first optical fiber needs to be relatively stable. Therefore, by defining the first fiber cut-off wavelength, the reliability of networking can be improved.
A second aspect of the present application provides an optical communication apparatus. The optical communication device comprises a band combiner and an optical signal interface. The band combiner is used for combining the first wavelength division multiplexing optical signal and the first mode division multiplexing optical signal to obtain a first multiplexing optical signal. The optical signal interface is configured to transmit the first multiplexed optical signal to the second optical communication device via the first optical fiber. The first optical fiber is a multimode optical fiber or a few-mode optical fiber. The wavelength of the first wavelength division multiplexed optical signal is greater than the cutoff wavelength of the first optical fiber. The wavelength of the first mode division multiplexed optical signal is less than the cutoff wavelength of the first optical fiber.
In an alternative form of the second aspect of the present application, the optical signal interface is further adapted to receive a second multiplexed optical signal from a second optical communication device over the first optical fiber. The second multiplexed optical signal comprises a second wavelength division multiplexed optical signal. The optical signal interface is further configured to transmit a second wavelength division multiplexed optical signal to a third optical communication device via a second optical fiber.
In an alternative form of the second aspect of the present application, the second multiplexed optical signal further comprises a second mode division multiplexed optical signal. The optical communication device also comprises a band splitter and a mode division multiplexing processing module. The band splitter is used for splitting the second multiplexing optical signal to obtain a second mode division multiplexing optical signal and a second wavelength division multiplexing optical signal. The module for processing the second module for multiplexing optical signal.
In an alternative form of the second aspect of the present application, the optical signal interface is further configured to receive a third wavelength division multiplexed optical signal from a third optical communication device via the second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal of the first wavelength band. The optical signal interface is also for transmitting the first optical signal to the first wavelength processing device. The optical signal interface is also for receiving a second optical signal of the first wavelength band from the first wavelength processing device. The first wavelength division multiplexed optical signal includes a second optical signal.
In an alternative form of the second aspect of the present application, the first wavelength processing device is any one of the following: OADM, ROADM, MUX, DEMUX, MUX and DEMUX.
In an alternative form of the second aspect of the present application, the optical communication apparatus further comprises a band splitting unit and a wave Duan Gebo unit. The band division unit is used for dividing the third wavelength division multiplexing optical signal to obtain a first optical signal of the first band and a third optical signal of the second band. The wave Duan Gebo unit is used for combining the second optical signal and the third optical signal to obtain a first wavelength division multiplexing optical signal.
In an alternative manner of the second aspect of the present application, the optical communication apparatus further includes an OSC processing module, an OSC demultiplexing unit, and an OSC multiplexing unit. The OSC demultiplexing unit is configured to demultiplex the third wavelength division multiplexing optical signal to obtain a first OSC optical signal and a first optical signal. The OSC demultiplexing unit is configured to transmit a first OSC optical signal to the OSC processing module. The OSC demultiplexer is configured to transmit the first optical signal to an optical signal interface. The OSC processing module is used for generating a second OSC optical signal according to the first OSC optical signal and transmitting the second OSC optical signal to the OSC multiplexing unit. The OSC multiplexing unit is configured to perform multiplexing on the second optical signal and the second OSC optical signal to obtain a first wavelength division multiplexing optical signal.
In an alternative form of the second aspect of the present application, the optical signal interface is further configured to receive a fifth wavelength division multiplexed optical signal from a third optical communication device via a third optical fiber. The optical signal interface is further configured to transmit a fifth wavelength division multiplexed optical signal to the second optical communication device via the fourth optical fiber.
In an alternative form of the second aspect of the application, the second optical fibre is a single mode fibre.
In an alternative form of the second aspect of the application, the cut-off wavelength of the first optical fibre is between 1420nm and 1500 nm.
A third aspect of the present application provides an optical communication system. The optical communication system includes a first optical communication device and a second optical communication device. The first optical communication device and the second optical communication device are connected by a first optical fiber. The first optical fiber is a multimode optical fiber or a few-mode optical fiber. The first optical communication device is configured to combine the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexing optical signal. The first optical communication device is configured to transmit a first multiplexed optical signal to the second optical communication device via the first optical fiber. The wavelength of the first wavelength division multiplexed optical signal is greater than the cutoff wavelength of the first optical fiber. The wavelength of the first mode division multiplexed optical signal is less than the cutoff wavelength of the first optical fiber. The second optical communication device is configured to receive the first multiplexed optical signal via the first optical fiber.
In an alternative form of the third aspect of the present application, the optical communication system further comprises a third optical communication device. The third optical communication device and the first optical communication device are connected by a second optical fiber. The first optical communication device is further configured to receive a second multiplexed optical signal from a second optical communication device over the first optical fiber. The second multiplexed optical signal comprises a second wavelength division multiplexed optical signal. The first optical communication device is further configured to transmit the second wavelength division multiplexed optical signal to the third optical communication device via the second optical fiber. The third optical communication device is configured to receive the second wavelength division multiplexed optical signal through the second optical fiber.
In an alternative form of the third aspect of the present application, the second multiplexed optical signal further comprises a second mode division multiplexed optical signal. The first optical communication device is further configured to perform wavelength division on the second multiplexed optical signal to obtain a second mode division multiplexed optical signal and a second wavelength division multiplexed optical signal.
In an alternative form of the third aspect of the present application, the optical communication system further comprises a third optical communication device and a first wavelength processing device. The third optical communication device and the first optical communication device are connected by a second optical fiber. The first optical communication device is further configured to receive a third wavelength division multiplexed optical signal from a third optical communication device over the second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal of the first wavelength band. The first optical communication device is also configured to transmit a first optical signal to the first wavelength processing device. The first wavelength processing device is further configured to transmit a second optical signal of the first wavelength band to the first optical communication device. The first optical communication device is also configured to receive a second optical signal of the first wavelength band from the first wavelength processing device. The first wavelength division multiplexed optical signal includes a second optical signal.
In an alternative form of the third aspect of the present application, the first wavelength processing device is any one of the following: OADM, ROADM, MUX, DEMUX, MUX and DEMUX.
In an alternative form of the third aspect of the present application, the first wavelength division multiplexed optical signal and the second wavelength division multiplexed optical signal each comprise a third optical signal of the second wavelength band. The first optical communication device is further configured to combine the second optical signal and the third optical signal to obtain a first wavelength division multiplexing optical signal.
In an alternative form of the third aspect of the present application, the third wavelength division multiplexed optical signal comprises the first OSC optical signal. The first optical communication device is further configured to generate a second OSC optical signal from the first OSC optical signal. The first wavelength division multiplexed optical signal includes a second OSC optical signal.
In an alternative form of the third aspect of the present application, the first optical communication device is further configured to receive a fifth wavelength division multiplexed optical signal from the third optical communication device via the third optical fiber. The first optical communication device is further configured to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device via the fourth optical fiber.
In an alternative form of the third aspect of the present application, the second optical fiber is a single mode optical fiber.
In an alternative form of the third aspect of the application, the cut-off wavelength of the first optical fibre is between 1420nm and 1500 nm.
Drawings
Fig. 1 is a schematic structural diagram of a first optical communication device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second structure of an optical communication device according to an embodiment of the present application;
fig. 3 is a schematic diagram of a third structure of an optical communication device according to an embodiment of the present application;
fig. 4 is a schematic diagram of a fourth configuration of an optical communication apparatus according to an embodiment of the present application;
fig. 5 is a schematic diagram of a fifth configuration of an optical communication apparatus according to an embodiment of the present application;
fig. 6 is a schematic diagram of a sixth structure of an optical communication apparatus according to an embodiment of the present application;
fig. 7 is a schematic view of a seventh structure of an optical communication apparatus according to an embodiment of the present application;
fig. 8 is a schematic view of an eighth structure of an optical communication apparatus according to an embodiment of the present application;
fig. 9 is a ninth schematic structural view of an optical communication apparatus according to an embodiment of the present application;
fig. 10 is a schematic view of a tenth structure of an optical communication apparatus according to an embodiment of the present application;
fig. 11 is a schematic diagram of a first flow of an optical communication method according to an embodiment of the present application;
fig. 12 is a second flowchart of an optical communication method according to an embodiment of the present application;
fig. 13 is a schematic diagram of a first configuration of an optical communication system according to an embodiment of the present application;
Fig. 14 is a schematic diagram of a second configuration of an optical communication system according to an embodiment of the present application;
fig. 15 is a schematic diagram of a third configuration of an optical communication system according to an embodiment of the present application.
Detailed Description
It is to be understood that the use of "first," "second," etc. herein is for descriptive purposes only and is not to be construed as indicating or implying any particular importance or order. In addition, for simplicity and clarity, reference numbers and/or letters are repeated throughout the several figures of the application. Repetition does not indicate a tightly defined relationship between the various embodiments and/or configurations.
The optical communication device in the embodiment of the application is applied to the field of optical communication. In the field of optical communications, when optical signals having wavelengths longer than the cutoff wavelength are transmitted through an optical fiber, the communication bandwidth can be increased by wavelength division multiplexing (wavelength division multiplexing, WDM). However, as communication data increases, how to further increase the communication bandwidth is an urgent problem to be solved.
To this end, an embodiment of the present application provides an optical communication apparatus. The optical communication apparatus is also referred to as a first optical communication device. Fig. 1 is a schematic structural diagram of a first optical communication device according to an embodiment of the present application. As shown in fig. 1, the optical communication apparatus 100 includes a band combiner 101 and an optical signal interface 102. The band combiner 101 is configured to combine the first wavelength division multiplexed optical signal and the first mode division multiplexed optical signal to obtain a first multiplexed optical signal. The optical signal interface 102 is also referred to as a fiber optic interface. The optical signal interface 102 is configured to transmit the first multiplexed optical signal to the second optical communication device via the first optical fiber 103. The first optical fiber is a multimode optical fiber or a few-mode optical fiber. The wavelength of each of the first wavelength division multiplexed optical signals is greater than the cutoff wavelength of the first optical fiber. The first wavelength division multiplexed optical signal includes one or more wavelength bands of optical signals. The wavelength of the optical signal of one or more wavelength bands is greater than the cut-off wavelength of the first optical fiber. For example, the cut-off wavelength of the first optical fiber is 1420nm. The first wavelength division multiplexed optical signal includes one or more wavelength signals in the C-band. The wavelength of the one or more wavelength signals is greater than the cutoff wavelength of the first optical fiber. The wavelength range of the C-band is between 1530nm and 1565 nm. The wavelength of each of the first mode division multiplexed optical signals is less than the cutoff wavelength of the first optical fiber. For example, the first mode-division multiplexed optical signal is an optical signal of the O band. The wavelength range of the O band is between 1260nm and 1380 nm. The first mode-division multiplexed optical signal may include one or more modes of optical signals. For example, the first mode division multiplexed optical signal includes a fundamental mode optical signal and a second order mode optical signal.
In the embodiment of the application, the mode division multiplexing optical signal and the wavelength division multiplexing optical signal are transmitted through one optical fiber, so that the communication bandwidth can be improved. It should be understood that in the present application, one fiber is equivalent to one core. The multicore fiber is equivalent to a plurality of optical fibers.
In practical applications, when the first mode-division multiplexed optical signal includes multiple modes of optical signals, the optical communication device may further include a mode-division multiplexing (mode division multiplexing, MDM) coupling unit. The MDM coupling unit is used for combining optical signals of multiple modes. For example, the MDM coupling unit is configured to combine the fundamental mode optical signal and the second order mode optical signal to obtain a first mode division multiplexing optical signal. It should be appreciated that the MDM coupling unit may also be used to combine the first multiplexed optical signal and the mode division multiplexed optical signal. For example, the first mode division multiplexed optical signal includes a fundamental mode optical signal. The band combiner 101 is configured to combine the first mode division multiplexed optical signal and the first wavelength division multiplexed optical signal to obtain a first multiplexed optical signal. The MDM coupling unit is used for combining the first multiplexing optical signal and the second-order mode optical signal to obtain the multiplexing optical signal to be transmitted.
It should be understood that in the present application, the description of the band combiner, the band splitter, etc. is only for the purpose of distinguishing the description. For example, a band combiner is used to achieve the combination of optical signals (a first wavelength division multiplexed optical signal and a first mode division multiplexed optical signal) of different wavelengths. Therefore, the band combiner may also be referred to as a band combiner. For another example, the band combiner is configured to implement multiplexing of the first wavelength division multiplexed optical signal and the first mode division multiplexed optical signal. Therefore, the band combiner may also be referred to as a multiplexer. For another example, in the following examples, the band combiner may also implement beam splitting or wave splitting of the second multiplexed optical signal. Therefore, the band combiner may also be referred to as a band splitter or a band splitter. Alternatively, the band combiner may also be referred to as a first combiner or a first combiner. Therefore, in the present application, beam combination may also be called wave combination, multiplexing, or the like. Beam splitting may also be referred to as demultiplexing, etc.
In an embodiment of the present application, the optical communication apparatus 100 may acquire the first wavelength division multiplexed optical signal or the first mode division multiplexed optical signal in various manners. This is described below.
In a first example, the optical communication apparatus 100 receives a first wavelength division multiplexed optical signal from a third optical communication device. For example, fig. 2 is a schematic diagram of a second structure of an optical communication device according to an embodiment of the present application. As shown in fig. 2, the optical communication apparatus 100 further includes an analog division multiplexing processing module 201 on the basis of fig. 1. The module 201 is configured to obtain a first mode-division multiplexed optical signal.
The mode division multiplexing processing module 201 may be an MDM coupling unit, an MDM coherent transmitter, or a set of an MDM coupling unit and an MDM coherent transmitter. When the mode division multiplexing processing module 201 is an MDM coupling unit, the MDM coupling unit may be used to receive a plurality of modes of optical signals from another device. The MDM coupling unit is used for combining the optical signals of the modes to obtain a first mode division multiplexing optical signal. When the mode division multiplexing processing module 201 is an MDM coherent transmitter, the MDM coherent transmitter is configured to generate a first mode division multiplexed optical signal from the electrical signal. For example, an MDM coherent transmitter is configured to obtain a first mode-division multiplexed optical signal by coherently modulating the optical signal. When the mode division multiplexing processing module 201 is a set of MDM coupling units and MDM coherent transmitters, the MDM coherent transmitters are used to generate a plurality of modes of optical signals. The MDM coupling unit is used for combining the optical signals of the modes to obtain a first mode division multiplexing optical signal.
The module 201 may also be a set of MDM coupling units and MDM decoupling units. For example, the MDM decoupling unit is configured to receive the third mode division multiplexed optical signal. The MDM decoupling unit is used for splitting the third mode division multiplexing optical signal to obtain optical signals of a plurality of modes. The MDM decoupling unit is used for transmitting optical signals of a plurality of modes to another device. The MDM coupling unit is used for receiving optical signals of a plurality of modes from another device. The MDM coupling unit is used for combining the optical signals of the modes to obtain a first mode division multiplexing optical signal.
The optical signal interface 102 is also connected to a third optical communication device via a second optical fiber 202. The optical signal interface 102 is further configured to receive the first wavelength division multiplexed optical signal from the third optical communication device via the second optical fiber 202. It should be appreciated that the optical communication apparatus 100 may also receive the first mode division multiplexed optical signal directly from another device.
In a second example, the optical communication apparatus 100 obtains the first wavelength division multiplexed optical signal by optical exchange with the wavelength processing device. For example, fig. 3 is a schematic diagram of a third structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 3, the optical signal interface 102 is further connected to the first wavelength processing device via an optical fiber 301 on the basis of fig. 2. The optical signal interface 102 is configured to receive the first wavelength division multiplexed optical signal from the third optical communication device via the second optical fiber 202. The first wavelength division multiplexed optical signal includes a first optical signal of a first wavelength band. The wavelength of the first band is greater than the cutoff wavelength of the first optical fiber. For example, the first band may be an S-band, a C-band, or an L-band. In the following examples, description will be given taking the first band as the C band as an example. The optical signal interface 102 is further configured to transmit a first optical signal to a first wavelength processing device via the optical fiber 301. The first wavelength processing device may be any one of the following: optical add/drop multiplexer (OADM), reconfigurable optical add/drop multiplexer (ROADM), multiplexer (MUX), demultiplexer (DEMUX), a combination of MUX and DEMUX. The first wavelength processing device transmits a second optical signal of the first wavelength band to the optical communication apparatus 100 according to the first optical signal. The optical signal interface 102 is further configured to receive a second optical signal from the first wavelength processing device via the optical fiber 301. The optical communication apparatus 100 uses the second optical signal as the first wavelength division multiplexed optical signal.
It should be appreciated that although the wavelengths of the first optical signal and the second optical signal are both within the first band, the wavelengths of the first optical signal and the second optical signal may be different. For example, the wavelength of the first optical signal is 1529.16nm. The wavelength of the second optical signal is 1529.55nm. The first optical signal and the second optical signal have a wavelength interval of 50 gigahertz (GHz).
In a third example, the optical communication apparatus 100 obtains the first wavelength division multiplexed optical signal from the third multiplexed optical signal received from the third optical communication device. For example, fig. 4 is a schematic diagram of a fourth structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 4, the optical communication apparatus 100 further includes a band splitter 401 on the basis of fig. 3. The optical signal interface 102 is configured to receive a third multiplexed optical signal from a third optical communication device via the second optical fiber 202. The third multiplexed optical signal includes a third wavelength division multiplexed optical signal and a third mode division multiplexed optical signal. The band splitter 401 is configured to split the third multiplexed optical signal to obtain a third wavelength division multiplexed optical signal and a third mode division multiplexed optical signal. The third wavelength division multiplexed optical signal includes a first optical signal of the first wavelength band. The optical signal interface 102 is further configured to transmit a first optical signal to a first wavelength processing device via the optical fiber 301. The first wavelength processing device transmits a second optical signal of the first wavelength band to the optical communication apparatus 100 according to the first optical signal. The optical signal interface 102 is further configured to receive a second optical signal from the first wavelength processing device via the optical fiber 301. The optical communication apparatus 100 uses the second optical signal as the first wavelength division multiplexed optical signal. The module 201 is further configured to obtain a first mode-division multiplexed optical signal according to the third mode-division multiplexed optical signal.
In the fourth example, the optical communication apparatus 100 may directly take the wavelength division multiplexed optical signal in the third multiplexed optical signal as the first wavelength division multiplexed optical signal. For example, fig. 5 is a schematic diagram of a fifth structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 5, the optical signal interface 102 is configured to receive a third multiplexed optical signal from a third optical communication device via the second optical fiber 202. The third multiplexed optical signal includes the first wavelength division multiplexed optical signal and a third mode division multiplexed optical signal. The band splitter 401 is configured to split the third multiplexed optical signal to obtain a first wavelength division multiplexed optical signal and a third mode division multiplexed optical signal. The module 201 is further configured to obtain a first mode-division multiplexed optical signal according to the third mode-division multiplexed optical signal. The band combiner 101 is configured to combine the first wavelength division multiplexed optical signal and the first mode division multiplexed optical signal to obtain a first multiplexed optical signal. The optical signal interface 102 is configured to transmit the first multiplexed optical signal to the second optical communication device via the first optical fiber 103.
In the fifth example, the optical communication apparatus 100 may directly take the mode-division multiplexed optical signal in the third multiplexed optical signal as the first mode-division multiplexed optical signal. For example, fig. 6 is a schematic diagram of a sixth structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 6, the optical signal interface 102 is configured to receive a third multiplexed optical signal from a third optical communication device via the second optical fiber 202. The third multiplexed optical signal includes a first wavelength division multiplexed optical signal and a first mode division multiplexed optical signal. The band splitter 401 is configured to split the third multiplexed optical signal to obtain a first wavelength division multiplexed optical signal and a first mode division multiplexed optical signal. The band combiner 101 is configured to combine the first wavelength division multiplexed optical signal and the first mode division multiplexed optical signal to obtain a first multiplexed optical signal. The optical signal interface 102 is configured to transmit the first multiplexed optical signal to the second optical communication device via the first optical fiber 103.
In a sixth example, the third wavelength division multiplexed optical signal includes optical signals of a plurality of wavelength bands. The wavelengths of the plurality of bands are greater than the cut-off wavelength of the first optical fiber 103. The optical communication apparatus 100 optically exchanges the optical signal of the partial wavelength band with the first wavelength processing device. The optical communication device 100 outputs an optical signal of the remaining portion of the wavelength band. The embodiments of the present application will be described by taking a plurality of bands including a C band and an L band as an example. For example, fig. 7 is a schematic diagram of a seventh structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 7, the optical communication apparatus 100 further includes a band splitter 701 and a band combiner 702 on the basis of fig. 4. The band splitter 701 is configured to receive the third wavelength division multiplexed optical signal from the band splitter 401. The band splitter 701 is configured to split the third wavelength division multiplexed optical signal to obtain a first optical signal in the first band and a third optical signal in the second band. The first band is the C band. The second band is the L band. The band splitter 701 is used to transmit the third optical signal to the band combiner 702. The band combiner 702 is configured to receive a second optical signal of the first band from the optical signal interface 102. The band combiner 702 is further configured to combine the second optical signal and the third optical signal to obtain a first wavelength division multiplexing optical signal.
In a seventh example, to monitor the wavelength division multiplexed optical signal, the first wavelength division multiplexed optical signal may also carry an OSC optical signal. For example, fig. 8 is a schematic diagram of an eighth structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 8, the optical communication apparatus 100 further includes an OSC processing module 801, an OSC demultiplexing unit 802, and an OSC multiplexing unit 803 on the basis of fig. 7. The OSC demultiplexing unit 802 is configured to receive the third wavelength division multiplexed optical signal from the band splitter 401. The OSC demultiplexing unit 802 is configured to demultiplex the third wavelength division multiplexing optical signal to obtain a first OSC optical signal and a service optical signal. The wavelength of the first OSC optical signal is different from the wavelength of the traffic optical signal. The traffic optical signal includes a first optical signal of a first wavelength band and a third optical signal of a second wavelength band. The OSC processing module 801 is configured to receive the first OSC optical signal from the OSC demultiplexer 802, and generate a second OSC optical signal according to the first OSC optical signal. The OSC processing module 801 is further configured to transmit a second OSC optical signal to the OSC multiplexing unit 803. The OSC combiner unit 803 is configured to receive the traffic optical signal from the band combiner 702. The traffic optical signal includes a second optical signal of the first wavelength band and a third optical signal of the second wavelength band. The wavelength of the second OSC optical signal is different from the wavelength of the traffic optical signal. The OSC multiplexing unit 803 is further configured to perform multiplexing on the second OSC optical signal and the service optical signal to obtain a first wavelength division multiplexing optical signal.
It should be understood that the optical communication apparatus 100 shown in the foregoing fig. 1 to 8 is just a few examples provided in the embodiments of the present application. In practical applications, the structure of the optical communication device 100 can be adaptively changed by those skilled in the art according to requirements.
For example, in fig. 8, the optical communication apparatus 100 uses the third mode-division multiplexed optical signal as the first mode-division multiplexed optical signal. At this time, the optical communication apparatus 100 may not include the mode division multiplexing processing module.
As another example, in fig. 4, the optical communication apparatus 100 further includes an OSC processing module 801, an OSC demultiplexing unit 802, and an OSC multiplexing unit 803. The OSC demultiplexing unit 802 is configured to demultiplex the third wavelength division multiplexed optical signal to obtain a first OSC optical signal and a first optical signal. The OSC processing module 801 is configured to generate a second OSC optical signal according to the first OSC optical signal. The OSC multiplexing unit 803 is configured to perform multiplexing on the second optical signal and the second OSC optical signal to obtain a first wavelength division multiplexing optical signal.
For another example, the functions of any two or three devices of the band combiner 101, the OSC combining unit 803, and the band combiner 702 may be performed by one device. For example, in fig. 7, the functions of the band combiner 101 and the band combiner 702 may be performed by one device. At this time, the device receives the second optical signal, the first optical signal, and the first mode division multiplexed optical signal. The device outputs a first multiplexed optical signal. For example, in fig. 8, the band combiner 101, the OSC combiner unit 803, and the band combiner 702 may be the same device. At this time, the device receives the first optical signal, the second OSC optical signal, and the first mode division multiplexed optical signal. The device outputs a first multiplexed optical signal. Similarly, the functions of any two or three devices of the band splitter 401, the OSC branching unit 802, and the band splitter 701 may be performed by one device.
For another example, the optical communication apparatus 100 may demultiplex and multiplex the wavelength division multiplexed signal to obtain a new wavelength division multiplexed optical signal. For example, in fig. 7, the optical communication apparatus 100 further includes a demultiplexer and a multiplexer. The demultiplexer is used for demultiplexing the third optical signal of the second wave band to obtain a plurality of sub optical signals with different wavelengths. The optical communication apparatus 100 performs down-wave on a part of the plurality of sub-optical signals. The demultiplexer outputs a remaining part of the plurality of sub-optical signals. The optical communication device 100 receives another portion of the sub-optical signal. The multiplexer is used for multiplexing the rest part of the sub-optical signals and the other part of the sub-optical signals to obtain a multiplexed third optical signal. The band combiner 702 is configured to combine the multiplexed third optical signal and second optical signal to obtain a first wavelength division multiplexed optical signal.
In the foregoing fig. 1 to 8, the optical communication apparatus 100 transmits the first multiplexed optical signal to the second optical communication device through the first optical fiber 103. It should be understood that in practical applications, the optical communication apparatus 100 may also receive the second multiplexed optical signal from the second optical communication device. The following describes an example of the optical communication apparatus 100 shown in fig. 2 and 8.
Fig. 9 is a schematic diagram of a ninth configuration of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 9, the optical communication apparatus 100 includes a band combiner 101, an optical signal interface 102, and a mode division multiplexing processing module 201. The optical signal interface 102 is connected to the second optical communication device via a first optical fiber 103. The optical signal interface 102 is configured to receive a second multiplexed optical signal from a second optical communication device via the first optical fiber 103. The second multiplexed optical signal includes a second mode division multiplexed optical signal and a second wavelength division multiplexed optical signal. The band combiner 101 is configured to split the second multiplexed optical signal to obtain a second mode division multiplexed optical signal and a second wavelength division multiplexed optical signal. The module 201 is configured to process the second mode-division multiplexed optical signal. For example, the mode division multiplexing processing module 201 is configured to convert the second mode division multiplexed optical signal into an electrical signal. For another example, the mode division multiplexing processing module 201 is configured to transmit the second mode division multiplexed optical signal to another device. The optical signal interface 102 is connected to a third optical communication device via a second optical fiber 202. The optical signal interface 102 is further configured to transmit a second wavelength division multiplexed optical signal to a third optical communication device via a second optical fiber 202.
Fig. 10 is a schematic view of a tenth structure of an optical communication apparatus according to an embodiment of the present application. As shown in fig. 9, the optical communication apparatus 100 includes a band combiner 101, an optical signal interface 102, a mode division multiplexing processing module 201, a band combiner 401, a band splitter 701, a band combiner 702, an OSC processing module 801, an OSC splitting unit 802, and an OSC combining unit 803.
Wherein the optical signal interface 102 is connected to the second optical communication device through a first optical fiber 103. The optical signal interface 102 is configured to receive a second multiplexed optical signal from a second optical communication device via the first optical fiber 103. The band combiner 101 is configured to split the second multiplexed optical signal to obtain a second mode division multiplexed optical signal and a second wavelength division multiplexed optical signal. The mode division multiplexing processing module 201 is configured to obtain a fourth mode division multiplexing optical signal according to the second mode division multiplexing optical signal, and transmit the fourth mode division multiplexing optical signal to the band combiner 401. The band combiner 101 is also configured to transmit the second wavelength division multiplexed optical signal to the OSC combining unit 803. The OSC multiplexing unit 803 is configured to perform demultiplexing on the second wavelength division multiplexing optical signal, to obtain a third OSC optical signal and a service optical signal. The traffic optical signals include a fourth optical signal of the first wavelength band and a sixth optical signal of the second wavelength band. The OSC multiplexing unit 803 is configured to transmit a third OSC optical signal to the OSC processing module 801. The OSC processing module 801 is configured to generate a fourth OSC optical signal according to the third OSC optical signal. The OSC processing module 801 is further configured to transmit a fourth OSC optical signal to the OSC demultiplexing unit 802. The OSC combiner unit 803 is further configured to transmit the traffic optical signal to the band combiner 702. The band combiner 702 is configured to split the service optical signal to obtain a fourth optical signal in the first band and a sixth optical signal in the second band. The band combiner 702 is further configured to transmit a fourth optical signal to the optical signal interface 102. The band combiner 702 is further configured to transmit the sixth optical signal to the band splitter 701.
The optical signal interface 102 is connected to the first wavelength processing device by an optical fiber 301. The optical signal interface 102 is configured to receive a fifth optical signal of the first wavelength band from the first wavelength processing device through the optical fiber 301. The optical signal interface 102 is further configured to transmit a fifth optical signal to the band demultiplexer 701. The band splitter 701 is configured to combine the fifth optical signal and the sixth optical signal to obtain a service optical signal. The band demultiplexer 701 is also used to transmit traffic optical signals to the OSC demultiplexing unit 802. The OSC demultiplexing unit 802 is configured to perform multiplexing on the service optical signal and the fourth OSC optical signal to obtain a fourth wavelength division multiplexing optical signal. The OSC branching unit 802 is also configured to transmit the fourth wavelength division multiplexed optical signal to the band combiner 401. The band combiner 401 is configured to combine the fourth wavelength division multiplexed optical signal and the fourth mode division multiplexed optical signal to obtain a fourth multiplexed optical signal. The optical signal interface 102 is connected to a third optical communication device by a second optical fiber 202. The optical signal interface 102 is further configured to transmit a fourth multiplexed optical signal to a third optical communication device via the second optical fiber 202.
In the aforementioned optical communication apparatus 100 of fig. 1 to 10, the first optical fiber 102 connected to the optical signal interface 102 is used to transmit the multiplexed optical signal. The multiplexed optical signals include a mode division multiplexed optical signal and a wavelength division multiplexed optical signal. Thus, the first optical fiber 102 is a multimode optical fiber or a few-mode optical fiber. In the foregoing fig. 2 and 3, the second optical fiber 302 connected to the optical signal interface 102 is used to transmit the wavelength division multiplexed optical signal. At this time, in order to reduce the cost of optical communication, the second optical fiber 302 may be a single mode optical fiber.
In an embodiment of the present application, the first optical fiber 102 is used for transmitting multiplexed optical signals. In order to improve the reliability of networking, the wavelengths of the mode division multiplexing optical signal and the wavelength division multiplexing optical signal need to be stable, that is, the cut-off wavelength of the first optical fiber 102 needs to be stable. Thus, the cut-off wavelength of the first optical fiber 102 may be controlled by quality monitoring during manufacturing. In one example, the cutoff wavelength of the first optical fiber 102 is between 1420nm and 1500 nm. In another example, the cutoff wavelength of the first optical fiber 102 is between 1440nm and 1480 nm.
In practical applications, the optical signal interface 102 may also be connected to a third optical communication device through a third optical fiber. The optical signal interface 102 is further configured to fifth wavelength division multiplex an optical signal from the third optical communication device through the third optical fiber. The optical signal interface 102 may also be connected from the second optical communication device via a fourth optical fiber. The optical signal interface 102 is further configured to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device via the fourth optical fiber. In practical applications, the optical communication device 100 may further include a memory. The memory may be used to store electrical signals when the MDM transmitter in the optical communication device 100 generates a first analog-to-digital multiplexed optical signal from the electrical signals. The memory may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an erasable ROM (EPROM), a flash memory, or the like. The volatile memory may be random access memory (random access memory, RAM).
In practical applications, the optical communication device may further comprise a processor. The MDM transmitter in the optical communication device 100 may generate a first mode division multiplexed optical signal from the electrical signal transmitted by the processor. The processor may be a central processor (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP. The processor may further comprise a hardware chip or other general purpose processor. The hardware chip may be an application specific integrated circuit (application specific integrated circuit, ASIC), a programmable logic device (programmable logic device, PLD), or a combination thereof.
The description has been made of the optical communication device provided in the embodiment of the present application. The following describes an optical communication method provided in the embodiment of the present application. Fig. 11 is a schematic diagram of a first flow of an optical communication method according to an embodiment of the present application. As shown in fig. 11, the optical communication method includes the following steps.
In step 1101, the first optical communication apparatus acquires a first mode division multiplexed optical signal and a first wavelength division multiplexed optical signal. The first optical communication apparatus may acquire the first wavelength division multiplexed optical signal or the first mode division multiplexed optical signal in various ways. For example, the first optical communication device receives the first wavelength division multiplexed optical signal from the third optical communication device. The first optical communication device generates a first mode division multiplexed optical signal from the electrical signal. For another example, the first optical communication device receives the first wavelength division multiplexed optical signal from the third optical communication device. The first optical communication device receives a first mode division multiplexed optical signal from another device.
In step 1102, the first optical communication apparatus performs beam combination on the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexed optical signal.
In step 1103, the first optical communication device transmits the first multiplexed optical signal to the second optical communication device over the first optical fiber. The first optical communication device and the second optical communication device are connected by a first optical fiber. The first optical fiber is a multimode optical fiber or a few-mode optical fiber. The wavelength of the first wavelength division multiplexed optical signal is greater than the cutoff wavelength of the first optical fiber. The first wavelength division multiplexed optical signal includes optical signals in one or more wavelength bands. For example, the cut-off wavelength of the first optical fiber is 1420nm. The first wavelength division multiplexed optical signal includes one or more wavelength signals in the C-band. The first mode-division multiplexed optical signal may include one or more modes of optical signals. For example, the first mode division multiplexed optical signal includes a fundamental mode optical signal and a second order mode optical signal.
It should be understood that, regarding the description of the optical communication method in the embodiment of the present application, reference may be made to the foregoing description of the optical communication apparatus 100. For example, fig. 12 is a second flowchart of an optical communication method according to an embodiment of the present application. In a modified example of the optical communication apparatus 100 shown in fig. 4, as shown in fig. 12, the optical communication method includes the following steps.
In step 1201, the first optical communication device receives a third multiplexed optical signal from a third optical communication device. The first optical communication device may be connected to the third optical communication device via a second optical fiber. The third multiplexed optical signal comprises a third wavelength division multiplexed optical signal first mode division multiplexed optical signal.
In step 1202, the first optical communication apparatus splits the third multiplexed optical signal to obtain a third wavelength division multiplexed optical signal and a first mode division multiplexed optical signal. A wavelength band splitter may be included in the first optical communication device. The first optical communication device splits the third multiplexed optical signal by a band splitter. The third wavelength division multiplexed optical signal includes a first optical signal of the first wavelength band. The first band may be a C band, an L band, an S band, and the like.
In step 1203, the first optical communication apparatus transmits the third wavelength division multiplexed optical signal to the first wavelength processing apparatus. The first optical communication device transmits a first optical signal of a first wavelength band to the first wavelength processing device. The first wavelength processing device may be any one of the following: OADM, ROADM, MUX, DEMUX, MUX and DEMUX.
In step 1204, the first optical communication device receives a first wavelength division multiplexed optical signal from a first wavelength processing device. The first wavelength division multiplexed optical signal includes a second optical signal of the first wavelength band. The wavelength of the second optical signal and the wavelength of the first optical signal belong to a first band. The wavelength of the second optical signal may be different from or the same as the wavelength of the first optical signal.
In step 1205, the first optical communication device performs beam combination on the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexed optical signal.
In step 1206, the first optical communication device transmits the first multiplexed optical signal over the first optical fiber to the second optical communication device. For the description of step 1206, reference may be made to the description of step 1103 in fig. 11 described above.
The foregoing describes an optical communication method provided in the embodiment of the present application. The following describes an optical communication system provided in an embodiment of the present application. Fig. 13 is a schematic diagram of a first configuration of an optical communication system according to an embodiment of the present application. As shown in fig. 13, the optical communication system includes a first optical communication apparatus 100 and a second optical communication apparatus 1302. The first optical communication device 100 and the second optical communication device 1302 are connected by a first optical fiber 103. The first optical fiber 103 is a multimode optical fiber or a few-mode optical fiber. The first optical communication device 100 is configured to combine the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexed optical signal. The first optical communication device 100 is further configured to transmit the first multiplexed optical signal to the second optical communication device 1302 via 103 the first optical fiber. The wavelength of the first wavelength division multiplexed optical signal is greater than the cutoff wavelength of the first optical fiber. The wavelength of the first mode division multiplexed optical signal is less than the cut-off wavelength of the first optical fiber. The second optical communication device 1302 is configured to receive the first multiplexed optical signal over a first optical fiber.
It should be understood that, for the description of the optical communication system in the embodiment of the present application, reference may be made to the foregoing description of the optical communication apparatus 100. For example, the first optical communication device 100 is further configured to receive a second multiplexed optical signal from the second optical communication device 1302 via the first optical fiber 103. For another example, the optical communication system further includes a third optical communication device. The first optical communication device 100 is further configured to receive a third multiplexed optical signal from a third optical communication device. The first optical communication device 100 is further configured to split the third multiplexed optical signal to obtain a first wavelength division multiplexed optical signal and a first mode division multiplexed optical signal.
Fig. 14 is a schematic diagram of a second configuration of an optical communication system according to an embodiment of the present application. As shown in fig. 14, the optical communication system further includes a third optical communication 1401 and a fourth optical communication device 1402 on the basis of fig. 13. Third optical communication 1401 and fourth optical communication device 1402 are coupled by optical fiber 1403. The third optical communication 1401 and the first optical communication device 100 are connected by the second optical fiber 202. In fig. 14, a second optical fiber 202 is used to transmit the wavelength division multiplexed optical signal. The first optical fiber 103 and the optical fiber 1403 are used for transmitting multiplexed optical signals. The multiplexed optical signals include wavelength division multiplexed optical signals and mode division multiplexed optical signals.
In one example, as shown in fig. 14, the second optical communication device 1302 is coupled to a WDM coherent transceiver 1409 and an MDM coherent transceiver 1405. The first optical communication device 100 is coupled to an MDM coherent transceiver 1406. The third optical communication 1401 is coupled to the MDM coherent transceiver 1407. The fourth optical communication device 1402 is connected to a WDM coherent transceiver 1404 and an MDM coherent transceiver 1408. The first optical fiber 103 is used to transmit a mode division multiplexed optical signal between the MDM coherent transceiver 1405 and the MDM coherent transceiver 1406. Fiber 1403 is used to transmit a mode division multiplexed optical signal between MDM coherent transceiver 1407 and MDM coherent transceiver 1408. The first optical fiber 103, the second optical fiber 202, and the optical fiber 1403 are used to transmit wavelength division multiplexed optical signals between the WDM coherent transceiver 1409 and the WDM coherent transceiver 1404.
It should be appreciated that in fig. 14, the coherent transceiver may be integrated in an optical communication device. For example, WDM coherent transceiver 1409 and/or MDM coherent transceiver 1405 are integrated in the second optical communication device 1302. As another example, the MDM coherent transceiver 1406 is integrated in the first optical communication device 100.
Fig. 15 is a schematic diagram of a third configuration of an optical communication system according to an embodiment of the present application. As shown in fig. 15, on the basis of fig. 14, the first optical communication apparatus 100 and the second optical communication apparatus 1302 are further connected by a fourth optical fiber 1501. The first optical communication device 100 and the third optical communication device 1401 are further connected to each other by a third optical fiber 1502. The third optical communication device 1401 and the fourth optical communication device 1402 are further connected by an optical fiber 1503. The third optical fiber 1502, the fourth optical fiber 1501 and the optical fiber 1503 are used only for transmitting wavelength division multiplexed optical signals. In one example, third optical fiber 1502, fourth optical fiber 1501, and optical fiber 1503 are used to transmit wavelength division multiplexed optical signals between second optical communication device 1302 and fourth optical communication device 1402.
It should be understood that in fig. 13 to 15, one or more intermediate devices may be further included between any two optical communication devices. For example, an intermediate device a and an intermediate device B are also included between the first optical communication device 100 and the third optical communication device 1401. The intermediate device may be used to amplify the optical signal to compensate for losses in the optical signal during transmission. For example, the intermediate device may be an optical line amplification node (optical line amplifier, OLA) node or an electrical Relay (REG) node.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered.

Claims (27)

1. An optical communication method, comprising:
the first optical communication device acquires a first mode division multiplexing optical signal and a first wavelength division multiplexing optical signal;
the first optical communication device performs beam combination on the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexing optical signal;
the first optical communication device transmits the first multiplexing optical signal to the second optical communication device through a first optical fiber, the first optical fiber is a multimode optical fiber or a few-mode optical fiber, the wavelength of the first wavelength division multiplexing optical signal is larger than the cut-off wavelength of the first optical fiber, and the wavelength of the first mode division multiplexing optical signal is smaller than the cut-off wavelength of the first optical fiber.
2. The method of optical communication of claim 1, wherein the method further comprises:
the first optical communication device receives a third wavelength division multiplexing optical signal from a third optical communication device through a second optical fiber, wherein the third wavelength division multiplexing optical signal comprises a first optical signal of a first wave band;
the first optical communication device transmits the first optical signal to a first wavelength processing device;
the first optical communication device acquiring a first wavelength division multiplexing optical signal includes: the first optical communication device receives a second optical signal of the first wavelength band from the first wavelength processing device, wherein the first wavelength division multiplexed optical signal includes the second optical signal.
3. The optical communication method according to claim 2, wherein the third wavelength division multiplexed optical signal further comprises a third optical signal of a second wavelength band;
the first optical communication device acquiring a first wavelength division multiplexing optical signal includes: and the first optical communication equipment performs wave combination on the second optical signal and the third optical signal to obtain the first wavelength division multiplexing optical signal.
4. The optical communication method according to claim 2 or 3, wherein the third wavelength division multiplexed optical signal comprises a first optical supervisory channel OSC optical signal;
The first optical communication device is further configured to generate a second OSC optical signal from the first OSC optical signal, and the first wavelength division multiplexed optical signal includes the second OSC optical signal.
5. The optical communication method according to claim 1, wherein the first optical communication device acquiring the first wavelength division multiplexed optical signal comprises: the first optical communication device receives the first wavelength division multiplexing optical signal from a third optical communication device through a second optical fiber;
the method further comprises the steps of:
the first optical communication device receives a second multiplexed optical signal from the second optical communication device through the first optical fiber, the second multiplexed optical signal comprising a second wavelength division multiplexed optical signal;
the first optical communication device transmits the second wavelength division multiplexed optical signal to the third optical communication device through the second optical fiber.
6. The optical communication method of claim 5, wherein the second multiplexed optical signal further comprises a second mode division multiplexed optical signal;
the first optical communication device is further configured to perform a wavelength division multiplexing on the second multiplexed optical signal to obtain the second mode division multiplexed optical signal and the second wavelength division multiplexed optical signal.
7. The method of optical communication according to any one of claims 2 to 6, wherein,
The method further comprises the steps of:
the first optical communication device receives a fifth wavelength division multiplexed optical signal from a third optical communication device through a third optical fiber;
the first optical communication device transmits the fifth wavelength division multiplexing optical signal to the second optical communication device through a fourth optical fiber.
8. The method of any one of claims 2 to 7, wherein the second optical fiber is a single mode optical fiber.
9. The method of any one of claims 1 to 8, wherein the first optical fiber has a cut-off wavelength between 1420nm and 1500 nm.
10. An optical communication device, comprising a band combiner and an optical signal interface, wherein:
the band combiner is used for combining the first wavelength division multiplexing optical signal and the first mode division multiplexing optical signal to obtain a first multiplexing optical signal;
the optical signal interface is used for transmitting the first multiplexing optical signal to the second optical communication equipment through a first optical fiber, the first optical fiber is a multimode optical fiber or a few-mode optical fiber, the wavelength of the first wavelength division multiplexing optical signal is larger than the cut-off wavelength of the first optical fiber, and the wavelength of the first mode division multiplexing optical signal is smaller than the cut-off wavelength of the first optical fiber.
11. The optical communication device according to claim 10, wherein,
the optical signal interface is further configured to receive a third wavelength division multiplexing optical signal from a third optical communication device through a second optical fiber, where the third wavelength division multiplexing optical signal includes a first optical signal of the first wavelength band;
the optical signal interface is further configured to transmit the first optical signal to a first wavelength processing device;
the optical signal interface is further configured to receive a second optical signal of the first wavelength band from the first wavelength processing device, wherein the first wavelength division multiplexed optical signal includes the second optical signal.
12. The optical communication device of claim 11, wherein the device further comprises a band splitting unit and a wave Duan Gebo unit;
the band branching unit is used for branching the third wavelength division multiplexing optical signal to obtain the first optical signal of the first band and a third optical signal of the second band;
the wave band wave combination unit is used for combining the second optical signal and the third optical signal to obtain the first wavelength division multiplexing optical signal.
13. The optical communication device according to claim 12, further comprising an optical supervisory channel OSC processing module, an OSC demultiplexing unit, and an OSC multiplexing unit;
The OSC demultiplexing unit is configured to demultiplex the third wavelength division multiplexing optical signal to obtain a first OSC optical signal and the first optical signal, transmit the first OSC optical signal to the OSC processing module, and transmit the first optical signal to the optical signal interface;
the OSC processing module is configured to generate a second OSC optical signal according to the first OSC optical signal, and transmit the second OSC optical signal to the OSC multiplexing unit;
the OSC multiplexing unit is configured to perform multiplexing on the second optical signal and the second OSC optical signal to obtain the first wavelength division multiplexing optical signal.
14. The optical communication device according to claim 10, wherein,
the optical signal interface is further configured to receive a second multiplexed optical signal from the second optical communication device through the first optical fiber, where the second multiplexed optical signal includes a second wavelength division multiplexed optical signal;
the optical signal interface is further configured to transmit the second wavelength division multiplexed optical signal to a third optical communication device through a second optical fiber.
15. The optical communication device of claim 14, wherein the second multiplexed optical signal further comprises a second mode division multiplexed optical signal, the device further comprising a mode division multiplexing processing module;
The band combiner is configured to split the second multiplexed optical signal to obtain the second mode division multiplexed optical signal and the second wavelength division multiplexed optical signal;
the module for processing the second module for multiplexing optical signal.
16. An optical communication apparatus according to any one of claims 11 to 15, wherein,
the optical signal interface is further configured to receive a fifth wavelength division multiplexed optical signal from the third optical communication device through a third optical fiber;
the optical signal interface is further configured to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device through a fourth optical fiber.
17. The optical communication device according to any one of claims 11 to 16, wherein the second optical fiber is a single mode optical fiber.
18. The optical communication device according to any one of claims 10 to 17, wherein the cut-off wavelength of the first optical fiber is between 1420nm and 1500 nm.
19. An optical communication system, comprising a first optical communication device and a second optical communication device, wherein the first optical communication device and the second optical communication device are connected through a first optical fiber, and the first optical fiber is a multimode optical fiber or a few-mode optical fiber, wherein:
The first optical communication device is used for combining the first mode division multiplexing optical signal and the first wavelength division multiplexing optical signal to obtain a first multiplexing optical signal;
the first optical communication device is configured to transmit the first multiplexed optical signal to the second optical communication device through the first optical fiber, where a wavelength of the first wavelength division multiplexed optical signal is greater than a cut-off wavelength of the first optical fiber, and a wavelength of the first mode division multiplexed optical signal is less than the cut-off wavelength of the first optical fiber;
the second optical communication device is configured to receive the first multiplexed optical signal through the first optical fiber.
20. The optical communication system of claim 19, further comprising a third optical communication device and a first wavelength processing device, the third optical communication device and the first optical communication device being connected by a second optical fiber;
the first optical communication device is further configured to receive a third wavelength division multiplexed optical signal from the third optical communication device through the second optical fiber, the third wavelength division multiplexed optical signal including a first optical signal of a first wavelength band;
the first optical communication device is further configured to transmit the first optical signal to the first wavelength processing device;
The first wavelength processing device is further configured to transmit a second optical signal of the first wavelength band to the first optical communication device;
the first optical communication device is further configured to receive a second optical signal of the first wavelength band from the first wavelength processing device, wherein the first wavelength division multiplexed optical signal includes the second optical signal.
21. The optical communication system of claim 20, wherein the first and second wavelength division multiplexed optical signals each comprise a third optical signal of a second wavelength band;
the first optical communication device is further configured to perform wave combination on the second optical signal and the third optical signal, so as to obtain the first wavelength division multiplexing optical signal.
22. The optical communication system according to claim 20 or 21, wherein the third wavelength division multiplexed optical signal comprises a first optical supervisory channel OSC optical signal;
the first optical communication device is further configured to generate a second OSC optical signal from the first OSC optical signal, and the first wavelength division multiplexed optical signal includes the second OSC optical signal.
23. The optical communication system of claim 19, further comprising a third optical communication device, the third optical communication device and the first optical communication device being connected by a second optical fiber;
The first optical communication device is further configured to receive a second multiplexed optical signal from the second optical communication device through the first optical fiber, the second multiplexed optical signal including a second wavelength division multiplexed optical signal;
the first optical communication device is further configured to transmit the second wavelength division multiplexed optical signal to the third optical communication device through the second optical fiber;
the third optical communication device is configured to receive the second wavelength division multiplexed optical signal through the second optical fiber.
24. The optical communication system of claim 23, wherein the second multiplexed optical signal further comprises a second mode division multiplexed optical signal;
the first optical communication device is further configured to perform a wavelength division multiplexing on the second multiplexed optical signal to obtain the second mode division multiplexed optical signal and the second wavelength division multiplexed optical signal.
25. An optical communication system according to any one of claims 20 to 24, wherein,
the first optical communication device is further configured to receive a fifth wavelength division multiplexed optical signal from the third optical communication device via a third optical fiber;
the first optical communication device is further configured to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device through a fourth optical fiber.
26. The optical communication system according to any one of claims 20 to 25, wherein the second optical fiber is a single mode optical fiber.
27. The optical communication system according to any one of claims 19 to 26, wherein the cut-off wavelength of the first optical fiber is between 1420nm and 1500 nm.
CN202210193220.5A 2022-02-28 2022-02-28 Optical communication method, device and system Pending CN116707697A (en)

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CN103152099B (en) * 2013-01-31 2016-05-25 华中科技大学 Divide multiplexing single fiber bi-directional transmission system based on mould
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