Optical communication method, apparatus and system

Abstract

The application provides an optical communication method applied to the field of optical communication. The optical communication method comprises the following steps: a 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 a 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 greater than the cutoff wavelength of the first optical fiber. The wavelength of the first mode division multiplexing 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

Technical Field

[0001] This application relates to the field of optical communication, and more particularly to optical communication methods, apparatus and systems. Background Technology

[0002] The replacement of copper with fiber optics is a trend in communications development. By using fiber optic communication, communication costs can be effectively reduced and communication bandwidth increased.

[0003] Optical fibers can transmit optical signals in different wavelength bands. The International Telecommunication Union (ITU) Telecommunication Standardization Department has classified the wavelength bands for optical fiber communication. These bands include the O-band, E-band, and S-band, among others. When an optical fiber transmits an optical signal longer than its cutoff wavelength, it can only transmit one mode of optical signal. For example, when the S-band wavelength is longer than the fiber's cutoff wavelength, the fiber can only transmit S-band optical signals in one mode. In this case, wavelength division multiplexing (WDM) can be used to increase the communication bandwidth.

[0004] However, with the increase in communication data, how to further improve communication bandwidth is an urgent problem to be solved. Summary of the Invention

[0005] This application provides an optical communication method, apparatus, and system that transmits mode-division multiplexed optical signals and wavelength-division multiplexed optical signals through a single optical fiber, thereby improving communication bandwidth.

[0006] This application provides an optical communication method. The optical communication method includes the following steps: a 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 signal. The first optical communication device combines the first mode-division multiplexed optical signal and the first wavelength-division multiplexed optical signal to obtain a first multiplexed optical signal. The first optical communication device transmits the first multiplexed optical signal to a second optical communication device through a first optical fiber. The first optical fiber is a multimode fiber or a few-mode 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.

[0007] In one alternative embodiment of the first aspect of this application, a first optical communication device receives a first wavelength division multiplexed optical signal from a third optical communication device via a second optical fiber. The optical communication method further includes the following steps: the first optical communication device receives a second multiplexed optical signal from a second optical communication device via the first optical fiber. The second multiplexed optical signal includes 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. By transmitting the wavelength division multiplexed optical signal bidirectionally, the utilization rate of the optical fiber can be effectively improved.

[0008] In one alternative embodiment of the first aspect of this application, the second multiplexed optical signal further includes a second mode-division multiplexed optical signal. The first optical communication device is further configured to perform wavelength division multiplexing on the second multiplexed optical signal to obtain a second mode-division multiplexed optical signal and a second wavelength division multiplexed optical signal. By bidirectionally transmitting the wavelength division multiplexed optical signal and the mode-division multiplexed optical signal, the utilization rate of the optical fiber can be effectively improved.

[0009] In an optional embodiment of the first aspect of this application, the optical communication method further includes the following steps: a first optical communication device receives a third wavelength division multiplexed optical signal from a third optical communication device via a second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal in a first wavelength band. The first optical communication device transmits the first optical signal to a first wavelength processing device. The first optical communication device receives a second optical signal in the first wavelength processing device from the first wavelength processing device. The first wavelength division multiplexed optical signal includes the second optical signal. The first optical communication device can perform optical switching with the first wavelength processing device, thereby improving the flexibility of network configuration.

[0010] In one alternative embodiment of the first aspect of this application, the first wavelength processing device is any of the following: an optical add / drop multiplexer (OADM), a reconfigurable optical add / drop multiplexer (ROADM), a multiplexer (MUX), a demultiplexer (DEMUX), or a combination of a MUX and a DEMUX. The first optical communication device can perform optical switching with existing wavelength division multiplexing networks, thereby improving networking flexibility.

[0011] In one alternative embodiment of the first aspect of this application, the third wavelength division multiplexed optical signal further includes a third optical signal in the second wavelength band. A first optical communication device combines the second and third optical signals to obtain the first wavelength division multiplexed optical signal. The first optical communication device can both enable direct transmission of the second wavelength band optical signal and perform optical switching of the first wavelength band optical signal with a first wavelength processing device. Therefore, this application can improve the flexibility of network deployment.

[0012] In one alternative embodiment of the first aspect of this application, the third wavelength division multiplexed optical signal includes a first optical supervisory channel (OSC) optical signal. The first optical communication device is further configured to generate a second OSC optical signal based on the first OSC optical signal. The first wavelength division multiplexed optical signal includes the second OSC optical signal. By adding an 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 can also be used to monitor the signal quality of the modulus-division multiplexed optical signal.

[0013] In one alternative embodiment of the first aspect of this application, the optical communication method further includes the following steps: a first optical communication device receives a fifth wavelength division multiplexed optical signal from a third optical communication device via a third optical fiber. The first optical communication device transmits the fifth wavelength division multiplexed optical signal to a second optical communication device via a fourth optical fiber. Multiple transmission optical fibers can be established between the second and third optical communication devices. The first optical fiber is used to transmit multiplexed optical signals. The multiplexed optical signals include mode division multiplexing (MDM) optical signals and wavelength division multiplexing (WDM) optical signals. The third and fourth optical fibers are used only for transmitting WDM optical signals. Therefore, this application can provide networking flexibility.

[0014] In one alternative embodiment of the first aspect of this application, the second optical fiber is a single-mode optical fiber. Multimode or few-mode optical fibers are more expensive than single-mode optical fibers. Furthermore, in this application, the second optical fiber does not need to transmit mode-division multiplexed optical signals. Therefore, by using single-mode optical fiber, the cost of optical communication can be reduced.

[0015] In one alternative embodiment of the first aspect of this application, the cutoff wavelength of the first optical fiber is between 1420 nanometers (nm) and 1500 nm. The first optical fiber in this application transmits both mode-division multiplexed (MDD) and wavelength-division multiplexed (WDM) optical signals. Furthermore, to improve network reliability, the wavelengths of both MMD and WDM signals need to be relatively stable, meaning the cutoff wavelength of the first optical fiber needs to be relatively stable. Therefore, by limiting the cutoff wavelength of the first optical fiber, network reliability can be improved.

[0016] A second aspect of this application provides an optical communication device. The optical communication device includes a bandgap combiner and an optical signal interface. The bandgap combiner is used to combine a first wavelength division multiplexed (WDM) optical signal and a first mode division multiplexed (MDD) optical signal to obtain a first multiplexed optical signal. The optical signal interface is used to transmit the first multiplexed optical signal to a second optical communication device via a first optical fiber. The first optical fiber is a multimode fiber or a few-mode fiber. The wavelength of the first WDM optical signal is greater than the cutoff wavelength of the first optical fiber. The wavelength of the first MMD optical signal is less than the cutoff wavelength of the first optical fiber.

[0017] In an alternative embodiment of the second aspect of this application, the optical signal interface is further configured to receive a second multiplexed optical signal from a second optical communication device via a first optical fiber. The second multiplexed optical signal includes a second wavelength division multiplexed optical signal. The optical signal interface is also configured to transmit the second wavelength division multiplexed optical signal to a third optical communication device via a second optical fiber.

[0018] In an optional embodiment of the second aspect of this application, the second multiplexed optical signal further includes a second mode-division multiplexed optical signal. The optical communication device also includes a waveband splitter and a mode-division multiplexing processing module. The waveband splitter is used to divide the second multiplexed optical signal into two wavelengths: a second mode-division multiplexed optical signal and a second waveband multiplexed optical signal. The mode-division multiplexing processing module is used to process the second mode-division multiplexed optical signal.

[0019] In an alternative embodiment of the second aspect of this application, the optical signal interface is further configured to receive a third wavelength division multiplexed optical signal from a third optical communication device via a second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal in a 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 in a first wavelength band from the first wavelength processing device. The first wavelength division multiplexed optical signal includes the second optical signal.

[0020] In one alternative embodiment of the second aspect of this application, the first wavelength processing device is any one of the following devices: OADM, ROADM, MUX, DEMUX, or a combination of MUX and DEMUX.

[0021] In an optional embodiment of the second aspect of this application, the optical communication device further includes a band demultiplexing unit and a band multiplexing unit. The band demultiplexing unit is used to demultiplex 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 band multiplexing unit is used to combine the second optical signal and the third optical signal to obtain a first wavelength division multiplexed optical signal.

[0022] In an optional embodiment of the second aspect of this application, the optical communication device further includes an OSC processing module, an OSC wavelength division multiplexing unit, and an OSC multiplexing unit. The OSC wavelength division multiplexing unit is used to divide the third wavelength division multiplexed optical signal into a first OSC optical signal and a first optical signal. The OSC wavelength division multiplexing unit is used to transmit the first OSC optical signal to the OSC processing module. The OSC wavelength division multiplexing unit is used to transmit the first optical signal to an optical signal interface. The OSC processing module is used to generate a second OSC optical signal based on the first OSC optical signal and transmit the second OSC optical signal to the OSC multiplexing unit. The OSC multiplexing unit is used to combine the second optical signal and the second OSC optical signal to obtain a first wavelength division multiplexed optical signal.

[0023] In an alternative embodiment of the second aspect of this 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 also configured to transmit the fifth wavelength division multiplexed optical signal to a second optical communication device via a fourth optical fiber.

[0024] In one alternative embodiment of the second aspect of this application, the second optical fiber is a single-mode optical fiber.

[0025] In one alternative embodiment of the second aspect of this application, the cutoff wavelength of the first optical fiber is between 1420 nm and 1500 nm.

[0026] A third aspect of this 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 via a first optical fiber. The first optical fiber is a multimode fiber or a few-mode fiber. The first optical communication device is used to combine a first mode-division multiplexed optical signal and a first wavelength-division multiplexed optical signal to obtain a first multiplexed optical signal. The first optical communication device is used to transmit the first multiplexed optical signal to the second optical communication device through 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 used to receive the first multiplexed optical signal through the first optical fiber.

[0027] In an alternative embodiment of the third aspect of this application, the optical communication system further includes a third optical communication device. The third optical communication device and the first optical communication device are connected via a second optical fiber. The first optical communication device is also configured to receive a second multiplexed optical signal from the second optical communication device via the first optical fiber. The second multiplexed optical signal includes a second wavelength division multiplexed optical signal. The first optical communication device is also 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 via the second optical fiber.

[0028] In one alternative embodiment of the third aspect of this application, the second multiplexed optical signal further includes a second mode-division multiplexed optical signal. The first optical communication device is further configured to perform wavelength division multiplexing on the second multiplexed optical signal to obtain a second mode-division multiplexed optical signal and a wavelength division multiplexed optical signal.

[0029] In an alternative embodiment of the third aspect of this application, the optical communication system further includes a third optical communication device and a first wavelength processing device. The third optical communication device and the first optical communication device are connected via 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 via the second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal in 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 in the first wavelength band to the first optical communication device. The first optical communication device is further configured to receive the second optical signal in the first wavelength band from the first wavelength processing device. The first wavelength division multiplexed optical signal includes the second optical signal.

[0030] In one alternative embodiment of the third aspect of this application, the first wavelength processing device is any one of the following devices: OADM, ROADM, MUX, DEMUX, or a combination of MUX and DEMUX.

[0031] In one alternative embodiment of the third aspect of this application, the first wavelength division multiplexed optical signal and the second wavelength division multiplexed optical signal each include a third optical signal in a second wavelength band. The first optical communication device is further configured to combine the second optical signal and the third optical signal to obtain the first wavelength division multiplexed optical signal.

[0032] In one alternative embodiment of the third aspect of this application, the third wavelength division multiplexed optical signal includes a first OSC optical signal. The first optical communication device is further configured to generate a second OSC optical signal based on the first OSC optical signal. The first wavelength division multiplexed optical signal includes the second OSC optical signal.

[0033] In an alternative embodiment of the third aspect of this 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 a third optical fiber. The first optical communication device is also configured to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device via a fourth optical fiber.

[0034] In one alternative embodiment of the third aspect of this application, the second optical fiber is a single-mode optical fiber.

[0035] In one alternative embodiment of the third aspect of this application, the cutoff wavelength of the first optical fiber is between 1420 nm and 1500 nm. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the first optical communication device provided in the embodiments of this application;

[0037] Figure 2 This is a second structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0038] Figure 3This is a third structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0039] Figure 4 This is a fourth structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0040] Figure 5 This is the fifth structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0041] Figure 6 This is a sixth structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0042] Figure 7 This is the seventh structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0043] Figure 8 This is the eighth structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0044] Figure 9 This is the ninth structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0045] Figure 10 This is the tenth structural schematic diagram of the optical communication device provided in the embodiments of this application;

[0046] Figure 11 This is a first flowchart illustrating the optical communication method provided in the embodiments of this application;

[0047] Figure 12 This is a second flowchart illustrating the optical communication method provided in the embodiments of this application;

[0048] Figure 13 This is a first structural schematic diagram of the optical communication system provided in the embodiments of this application;

[0049] Figure 14 This is a second structural schematic diagram of the optical communication system provided in the embodiments of this application;

[0050] Figure 15 This is a third structural schematic diagram of the optical communication system provided in the embodiments of this application. Detailed Implementation

[0051] It should be understood that the terms "first," "second," etc., used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or order. Furthermore, for the sake of brevity and clarity, reference numerals and / or letters are repeated in several figures of this application. This repetition does not indicate a strict limiting relationship between the various embodiments and / or configurations.

[0052] The optical communication device in this application is applied to the field of optical communication. In the field of optical communication, when transmitting optical signals with wavelengths longer than the cutoff wavelength through optical fibers, wavelength division multiplexing (WDM) can be used to increase the communication bandwidth. However, with the increase in communication data, how to further improve the communication bandwidth is an urgent problem to be solved.

[0053] Therefore, embodiments of this application provide an optical communication device. The optical communication device is also referred to as a first optical communication equipment. Figure 1 This is a schematic diagram of the first optical communication device provided in the embodiments of this application. Figure 1 As shown, the optical communication device 100 includes a band combiner 101 and an optical signal interface 102. The band combiner 101 is used to combine a first wavelength division multiplexed (WDM) optical signal and a first mode division multiplexed (MDD) optical signal to obtain a first multiplexed optical signal. The optical signal interface 102 is also called an optical fiber interface. The optical signal interface 102 is used to transmit the first multiplexed optical signal to a second optical communication device through a first optical fiber 103. The first optical fiber is a multimode fiber or a few-mode fiber. The wavelength of each optical signal in the first WDM optical signal is greater than the cutoff wavelength of the first optical fiber. The first WDM optical signal includes optical signals in one or more wavelength bands. The wavelength of the one or more wavelength bands of optical signals is greater than the cutoff wavelength of the first optical fiber. For example, the cutoff wavelength of the first optical fiber is 1420 nm. The first WDM 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 1530 nm and 1565 nm. The wavelength of each optical signal in the first MMD optical signal is less than the cutoff wavelength of the first optical fiber. For example, the first mode-division multiplexed optical signal is an O-band optical signal. The wavelength range of the O-band is between 1260 nm and 1380 nm. The first mode-division multiplexed optical signal may include one or more modes of optical signal. For example, the first mode-division multiplexed optical signal includes a fundamental mode optical signal and a second-order mode optical signal.

[0054] In this embodiment, transmitting mode-division multiplexed and wavelength-division multiplexed optical signals through a single optical fiber can improve communication bandwidth. It should be understood that in this application, a single optical fiber is equivalent to a single fiber core. A multi-core optical fiber is equivalent to multiple optical fibers.

[0055] In practical applications, when the first mode-division multiplexed optical signal includes multiple modes of optical signals, the optical communication device may also include a mode-division multiplexing (MDM) coupling unit. The MDM coupling unit is used to combine multiple modes of optical signals. For example, the MDM coupling unit is used to combine a fundamental mode optical signal and a second-order mode optical signal to obtain the first mode-division multiplexed optical signal. It should be understood that the MDM coupling unit can 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 waveband combiner 101 is used to combine the first mode-division multiplexed optical signal and the first wavelength division multiplexed optical signal to obtain the first multiplexed optical signal. The MDM coupling unit is used to combine the first multiplexed optical signal and the second-order mode optical signal to obtain the multiplexed optical signal to be transmitted.

[0056] It should be understood that in this application, the descriptions of waveband optical combiners, waveband demultiplexers, etc., are merely for distinguishing purposes. For example, a waveband optical combiner is used to combine optical signals of different wavelengths (a first wavelength division multiplexed optical signal and a first mode division multiplexed optical signal). Therefore, a waveband optical combiner can also be called a waveband demultiplexer. As another example, a waveband optical combiner is used to multiplex a first wavelength division multiplexed optical signal and a first mode division multiplexed optical signal. Therefore, a waveband optical combiner can also be called a multiplexer. As yet another example, in subsequent examples, a waveband optical combiner can also be used to split or demultiplex a second multiplexed optical signal. Therefore, a waveband optical combiner can also be called a waveband demultiplexer or a waveband demultiplexer. Alternatively, a waveband optical combiner can also be called a first optical combiner or a first waveband demultiplexer. Therefore, in this application, beam combining can also be called wave combining, multiplexing, etc. Beam splitting can also be called wave splitting, demultiplexing, etc.

[0057] In the embodiments of this application, the optical communication device 100 can acquire the first wavelength division multiplexing optical signal or the first mode division multiplexing optical signal in various ways. These are described below.

[0058] In the first example, optical communication device 100 receives a first wavelength division multiplexed optical signal from a third optical communication device. For example, Figure 2 This is a second structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 2 As shown, in Figure 1 Based on this, the optical communication device 100 also includes a mode-division multiplexing processing module 201. The mode-division multiplexing processing module 201 is used to acquire the first mode-division multiplexed optical signal.

[0059] The mode-division multiplexing (MDD) processing module 201 can be an MDM coupling unit, an MDM coherent transmitter, or a combination of both. When the MDM processing module 201 is an MDM coupling unit, it can receive multiple modes of optical signals from another device. The MDM coupling unit combines the multiple modes of optical signals to obtain a first MDM optical signal. When the MDM processing module 201 is an MDM coherent transmitter, it generates the first MDM optical signal based on an electrical signal. For example, the MDM coherent transmitter obtains the first MDM optical signal by coherently modulating an optical signal. When the MDM processing module 201 is a combination of an MDM coupling unit and an MDM coherent transmitter, the MDM coherent transmitter generates multiple modes of optical signals. The MDM coupling unit combines the multiple modes of optical signals to obtain the first MDM optical signal.

[0060] The mode-division multiplexing (MDD) processing module 201 can also be a combination of MDM coupling units and MDM decoupling units. For example, the MDM decoupling unit is used to receive a third-mode multiplexed optical signal. The MDM decoupling unit is used to split the third-mode multiplexed optical signal to obtain multiple-mode optical signals. The MDM decoupling unit is used to transmit multiple-mode optical signals to another device. The MDM coupling unit is used to receive multiple-mode optical signals from another device. The MDM coupling unit is used to combine the multiple-mode optical signals to obtain a first-mode multiplexed optical signal.

[0061] 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 also used to receive a first wavelength division multiplexed optical signal from the third optical communication device via the second optical fiber 202. It should be understood that the optical communication device 100 can also directly receive a first mode division multiplexed optical signal from another device.

[0062] In the second example, the optical communication device 100 obtains the first wavelength division multiplexed optical signal through optical exchange with a wavelength processing device. For example, Figure 3 This is a third structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 3 As shown, in Figure 2Based on this, the optical signal interface 102 is also connected to the first wavelength processing device via optical fiber 301. The optical signal interface 102 is used to receive a 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 in a first band. The wavelength of the first band is greater than the cutoff wavelength of the first optical fiber. For example, the first band can be an S-band, C-band, or L-band. In subsequent examples, the first band will be described as a C-band. The optical signal interface 102 is also used to transmit the first optical signal to the first wavelength processing device via optical fiber 301. The first wavelength processing device can be any of the following devices: an optical add / drop multiplexer (OADM), a reconfigurable optical add / drop multiplexer (ROADM), a multiplexer (MUX), a demultiplexer (DEMUX), or a combination of MUX and DEMUX. The first wavelength processing device transmits a second optical signal in the first band to the optical communication device 100 according to the first optical signal. The optical signal interface 102 is also used to receive a second optical signal from the first wavelength processing device via optical fiber 301. The optical communication device 100 uses the second optical signal as the first wavelength division multiplexing optical signal.

[0063] It should be understood that although the wavelengths of the first and second optical signals are both within the first wavelength band, their wavelengths may differ. For example, the wavelength of the first optical signal is 1529.16 nm, and the wavelength of the second optical signal is 1529.55 nm. The wavelength interval between the first and second optical signals is 50 gigahertz (GHz).

[0064] In the third example, the optical communication device 100 obtains the first wavelength division multiplexed optical signal from the third multiplexed optical signal received from the third optical communication device. For example, Figure 4 This is a fourth structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 4 As shown, in Figure 3Based on this, the optical communication device 100 further includes a band splitter 401. An optical signal interface 102 is used to receive a third multiplexed optical signal from a third optical communication device via a second optical fiber 202. The third multiplexed optical signal includes a third wavelength division multiplexing (WDM) optical signal and a third mode division multiplexing (MDD) optical signal. The band splitter 401 is used to split the third multiplexed optical signal to obtain a third WDM optical signal and a third MMD optical signal. The third WDM optical signal includes a first optical signal in a first wavelength band. The optical signal interface 102 is also used to transmit the first optical signal to a first wavelength processing device via an optical fiber 301. The first wavelength processing device transmits a second optical signal in the first wavelength band to the optical communication device 100 based on the first optical signal. The optical signal interface 102 is also used to receive the second optical signal from the first wavelength processing device via an optical fiber 301. The optical communication device 100 uses the second optical signal as the first WDM optical signal. The MMD processing module 201 is also used to obtain the first MMD optical signal based on the third MMD optical signal.

[0065] In the fourth example, the optical communication device 100 can directly use the wavelength division multiplexing optical signal in the third multiplexed optical signal as the first wavelength division multiplexing optical signal. For example, Figure 5 This is the fifth structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 5 As shown, the optical signal interface 102 is used to receive a third multiplexed optical signal from the third optical communication device via the second optical fiber 202. The third multiplexed optical signal includes a first wavelength division multiplexing (WDM) optical signal and a third mode division multiplexing (MDD) optical signal. The waveband splitter 401 is used to split the third multiplexed optical signal to obtain the first WDM optical signal and the third MMD optical signal. The MMD processing module 201 is also used to obtain the first MMD optical signal based on the third MMD optical signal. The waveband combiner 101 is used to combine the first WDM optical signal and the first MMD optical signal to obtain the first multiplexed optical signal. The optical signal interface 102 is used to transmit the first multiplexed optical signal to the second optical communication device via the first optical fiber 103.

[0066] In the fifth example, the optical communication device 100 can directly use the modulus-division multiplexed optical signal in the third multiplexed optical signal as the first modulus-division multiplexed optical signal. For example, Figure 6 This is the sixth structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 6As shown, the optical signal interface 102 is used to receive a third multiplexed optical signal from the third optical communication device via the second optical fiber 202. The third multiplexed optical signal includes a first wavelength division multiplexing (WDM) optical signal and a first mode division multiplexing (MDD) optical signal. The waveband splitter 401 is used to split the third multiplexed optical signal to obtain the first WDM optical signal and the first MMD optical signal. The waveband combiner 101 is used to combine the first WDM optical signal and the first MMD optical signal to obtain the first multiplexed optical signal. The optical signal interface 102 is used to transmit the first multiplexed optical signal to the second optical communication device via the first optical fiber 103.

[0067] In the sixth example, the third wavelength division multiplexed optical signal includes optical signals of multiple wavelength bands. The wavelengths of these multiple wavelength bands are greater than the cutoff wavelength of the first optical fiber 103. The optical communication device 100 performs optical exchange between a portion of the optical signals and the first wavelength processing device. The optical communication device 100 outputs the remaining portion of the optical signals. This application embodiment will be described using the example of multiple wavelength bands including C-band and L-band. For example, Figure 7 This is the seventh structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 7 As shown, in Figure 4 Based on this, the optical communication device 100 further includes a band demultiplexer 701 and a band multiplexer 702. The band demultiplexer 701 receives a third wavelength division multiplexed optical signal from the band demultiplexer 401. The band demultiplexer 701 demultiplexes the third wavelength division multiplexed optical signal to obtain a first optical signal in a first band and a third optical signal in a second band. The first band is the C-band. The second band is the L-band. The band demultiplexer 701 transmits the third optical signal to the band multiplexer 702. The band multiplexer 702 receives a second optical signal in the first band from the optical signal interface 102. The band multiplexer 702 also combines the second and third optical signals to obtain a first wavelength division multiplexed optical signal.

[0068] In the seventh example, to monitor the wavelength division multiplexed optical signal, the first wavelength division multiplexed optical signal can also carry an OSC optical signal. For example, Figure 8 This is the eighth structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 8 As shown, in Figure 7Based on this, the optical communication device 100 further includes an OSC processing module 801, an OSC wavelength division multiplexing unit 802, and an OSC multiplexing unit 803. The OSC wavelength division multiplexing unit 802 receives a third wavelength division multiplexed optical signal from the bandgap splitter 401. The OSC wavelength division multiplexing unit 802 performs wavelength division multiplexing on the third wavelength division multiplexed 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 service optical signal. The service optical signal includes a first optical signal in a first band and a third optical signal in a second band. The OSC processing module 801 receives the first OSC optical signal from the OSC wavelength division multiplexing unit 802 and generates a second OSC optical signal based on the first OSC optical signal. The OSC processing module 801 also transmits the second OSC optical signal to the OSC multiplexing unit 803. The OSC multiplexing unit 803 receives the service optical signal from the bandgap multiplexer 702. The service optical signal includes a second optical signal in a first band and a third optical signal in a second band. The wavelength of the second OSC optical signal is different from that of the service optical signal. The OSC multiplexing unit 803 is also used to multiplex the second OSC optical signal and the service optical signal to obtain the first wavelength division multiplexing optical signal.

[0069] It should be understood that the aforementioned Figures 1 to 8 The optical communication device 100 shown is only one example provided in the embodiments of this application. In practical applications, those skilled in the art can make adaptive changes to the structure of the optical communication device 100 according to their needs.

[0070] For example, in Figure 8 In this case, the optical communication device 100 uses the third mode-division multiplexed optical signal as the first mode-division multiplexed optical signal. At this time, the optical communication device 100 may not include a mode-division multiplexing processing module.

[0071] For example, in Figure 4 In the optical communication device 100, there are also OSC processing module 801, OSC wavelength division multiplexing unit 802, and OSC multiplexing unit 803. OSC wavelength division multiplexing unit 802 is used to divide the third wavelength division multiplexed optical signal into a first OSC optical signal and a second OSC optical signal. OSC processing module 801 is used to generate a second OSC optical signal based on the first OSC optical signal. OSC multiplexing unit 803 is used to combine the second optical signal and the second OSC optical signal to obtain a first wavelength division multiplexed optical signal.

[0072] For example, the functions of any two or three devices in the zone combiner 101, OSC combiner unit 803, and zone combiner 702 can be performed by a single device. For example, in Figure 7 In this configuration, the functions of waveband combiner 101 and waveband combiner 702 can be performed by a single 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 the first multiplexed optical signal. For example, in... Figure 8 In this configuration, the waveband multiplexer 101, OSC multiplexing unit 803, and waveband multiplexer 702 can function as a single device. In this case, the device receives a first optical signal, a second optical signal, a second OSC optical signal, and a first mode-division multiplexed optical signal. The device outputs the first multiplexed optical signal. Similarly, the functions of any two or three of the waveband splitter 401, OSC demultiplexer unit 802, and waveband demultiplexer 701 can be performed by a single device.

[0073] For example, the optical communication device 100 can also demultiplex and multiplex wavelength division multiplexed signals to obtain new wavelength division multiplexed optical signals. For example, in Figure 7 In this optical communication device 100, a demultiplexer and a multiplexer are also included. The demultiplexer demultiplexes the third optical signal in the second band to obtain multiple sub-optical signals of different wavelengths. The optical communication device 100 performs down-wavelength division multiplexing on a portion of the multiple sub-optical signals. The demultiplexer outputs the remaining portion of the multiple sub-optical signals. The optical communication device 100 receives another portion of the sub-optical signals. The multiplexer multiplexes the remaining portion of the sub-optical signals and another portion of the sub-optical signals to obtain the multiplexed third optical signal. The bandgap multiplexer 702 combines the multiplexed third optical signal and the second optical signal to obtain the first wavelength division multiplexed optical signal.

[0074] In the foregoing Figures 1 to 8 In this process, the optical communication device 100 transmits a first multiplexed optical signal to the second optical communication device via the first optical fiber 103. It should be understood that in practical applications, the optical communication device 100 can also receive a second multiplexed optical signal from the second optical communication device. The following section uses... Figure 2 and Figure 8 The optical communication device 100 shown is described as an example.

[0075] Figure 9 This is the ninth structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 9As shown, the optical communication device 100 includes a bandgap combiner 101, an optical signal interface 102, and a mode-division multiplexing (MDD) processing module 201. The optical signal interface 102 is connected to a second optical communication device via a first optical fiber 103. The optical signal interface 102 is used to receive a second multiplexed optical signal from the 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 bandgap combiner 101 is used 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 MMD processing module 201 is used to process the second mode-division multiplexed optical signal. For example, the MMD processing module 201 is used to convert the second mode-division multiplexed optical signal into an electrical signal. Alternatively, the MMD processing module 201 is used 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 also used to transmit a second wavelength division multiplexed optical signal to a third optical communication device via the second optical fiber 202.

[0076] Figure 10 This is the tenth structural schematic diagram of the optical communication device provided in the embodiments of this application. For example... Figure 9 As shown, the optical communication device 100 includes a band beam combiner 101, an optical signal interface 102, a mode division multiplexing processing module 201, a band beam combiner 401, a band demultiplexer 701, a band beam combiner 702, an OSC processing module 801, an OSC demultiplexer unit 802, and an OSC multiplexing unit 803.

[0077] The optical signal interface 102 is connected to the second optical communication device via the first optical fiber 103. The optical signal interface 102 receives a second multiplexed optical signal from the second optical communication device via the first optical fiber 103. The waveband combiner 101 splits 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 obtains a fourth mode-division multiplexed optical signal based on the second mode-division multiplexed optical signal and transmits the fourth mode-division multiplexed optical signal to the waveband combiner 401. The waveband combiner 101 also transmits the second wavelength-division multiplexed optical signal to the OSC multiplexing unit 803. The OSC multiplexing unit 803 splits the second wavelength-division multiplexed optical signal to obtain a third OSC optical signal and a service optical signal. The service optical signal includes a fourth optical signal in the first band and a sixth optical signal in the second band. The OSC multiplexing unit 803 transmits the third OSC optical signal to the OSC processing module 801. OSC processing module 801 is used to generate a fourth OSC optical signal based on the third OSC optical signal. OSC processing module 801 is also used to transmit the fourth OSC optical signal to OSC demultiplexing unit 802. OSC multiplexing unit 803 is also used to transmit service optical signals to waveband multiplexer 702. Waveband multiplexer 702 is used to demultiplex the service optical signal to obtain a fourth optical signal in the first band and a sixth optical signal in the second band. Waveband multiplexer 702 is also used to transmit the fourth optical signal to optical signal interface 102. Waveband multiplexer 702 is also used to transmit the sixth optical signal to waveband demultiplexer 701.

[0078] Optical signal interface 102 is connected to the first wavelength processing device via optical fiber 301. Optical signal interface 102 is used to receive the fifth optical signal of the first wavelength band from the first wavelength processing device via optical fiber 301. Optical signal interface 102 is also used to transmit the fifth optical signal to a band demultiplexer 701. Band demultiplexer 701 is used to combine the fifth and sixth optical signals to obtain a service optical signal. Band demultiplexer 701 is also used to transmit the service optical signal to an OSC demultiplexer unit 802. OSC demultiplexer 802 is used to combine the service optical signal and a fourth OSC optical signal to obtain a fourth wavelength division multiplexed optical signal. OSC demultiplexer 802 is also used to transmit the fourth wavelength division multiplexed optical signal to a band combiner 401. Band combiner 401 is used to combine the fourth wavelength division multiplexed optical signal and a fourth mode division multiplexed optical signal to obtain a fourth multiplexed optical signal. Optical signal interface 102 is connected to the third optical communication device via a second optical fiber 202. The optical signal interface 102 is also used to transmit a fourth multiplexed optical signal to a third optical communication device via the second optical fiber 202.

[0079] In the foregoing Figures 1 to 10In the optical communication device 100, a first optical fiber 102 connected to an optical signal interface 102 is used to transmit multiplexed optical signals. The multiplexed optical signals include mode-division multiplexed optical signals and wavelength-division multiplexed optical signals. Therefore, the first optical fiber 102 is a multimode fiber or a few-mode fiber. (As mentioned above...) Figure 2 and Figure 3 In this configuration, the second optical fiber 302, connected to the optical signal interface 102, is used to transmit wavelength division multiplexed optical signals. To reduce the cost of optical communication, the second optical fiber 302 can be a single-mode optical fiber.

[0080] In this embodiment, the first optical fiber 102 is used to transmit multiplexed optical signals. To improve network reliability, the wavelengths of the mode-division multiplexed and wavelength-division multiplexed optical signals need to be relatively stable, meaning the cutoff wavelength of the first optical fiber 102 needs to be relatively stable. Therefore, the cutoff wavelength of the first optical fiber 102 can be controlled through quality monitoring during the manufacturing process. In one example, the cutoff wavelength of the first optical fiber 102 is between 1420 nm and 1500 nm. In another example, the cutoff wavelength of the first optical fiber 102 is between 1440 nm and 1480 nm.

[0081] In practical applications, the optical signal interface 102 can also be connected to a third optical communication device via a third optical fiber. The optical signal interface 102 is also used to transmit a fifth wavelength division multiplexed optical signal from the third optical communication device via the third optical fiber. The optical signal interface 102 can also be connected to a second optical communication device via a fourth optical fiber. The optical signal interface 102 is also used to transmit a 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 also include a memory. When the MDM transmitter in the optical communication device 100 generates a first mode division multiplexed optical signal based on an electrical signal, the memory can be used to store the electrical signal. The memory can be volatile memory or non-volatile memory, or may include both. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), or flash memory, etc. The volatile memory can be random access memory (RAM).

[0082] In practical applications, optical communication devices may also include a processor. The MDM transmitter in the optical communication device 100 can generate a first mode-division multiplexed optical signal based on the electrical signal transmitted by the processor. The processor may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor may further include a hardware chip or other general-purpose processor. The aforementioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.

[0083] The optical communication apparatus provided in the embodiments of this application has been described above. The optical communication method provided in the embodiments of this application is described below. Figure 11 This is a schematic diagram of the first process of the optical communication method provided in the embodiments of this application. Figure 11 As shown, the optical communication method includes the following steps.

[0084] In step 1101, the first optical communication device acquires a first mode-division multiplexed optical signal and a first wavelength-division multiplexed optical signal. The first optical communication device can 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 a third optical communication device. The first optical communication device generates the first mode-division multiplexed optical signal based on an electrical signal. Another example is that the first optical communication device receives the first wavelength-division multiplexed optical signal from a third optical communication device. The first optical communication device receives the first mode-division multiplexed optical signal from another device.

[0085] In step 1102, the first optical communication device combines the first mode-division multiplexed optical signal and the first wavelength-division multiplexed optical signal to obtain the first multiplexed optical signal.

[0086] In step 1103, the first optical communication device transmits a first multiplexed optical signal to the second optical communication device via a first optical fiber. The first and second optical communication devices are connected via the first optical fiber. The first optical fiber is a multimode or few-mode 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 cutoff wavelength of the first optical fiber is 1420 nm. 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 signal. For example, the first mode division multiplexed optical signal includes a fundamental mode optical signal and a second-order mode optical signal.

[0087] It should be understood that the description of the optical communication method in the embodiments of this application can be referred to the description of the aforementioned optical communication device 100. For example, Figure 12 This is a second flowchart illustrating the optical communication method provided in this application embodiment. Figure 4 In a modified example of the optical communication device 100 shown, such as Figure 12 As shown, the optical communication method includes the following steps.

[0088] In step 1201, the first optical communication device receives a third multiplexed optical signal from the third optical communication device. The first optical communication device can be connected to the third optical communication device via a second optical fiber. The third multiplexed optical signal includes a third wavelength division multiplexing optical signal and a first mode division multiplexing optical signal.

[0089] In step 1202, the first optical communication device splits the third multiplexed optical signal to obtain a third wavelength division multiplexed optical signal and a first mode division multiplexed optical signal. The first optical communication device may include a band beamsplitter. The first optical communication device splits the third multiplexed optical signal using the band beamsplitter. The third wavelength division multiplexed optical signal includes a first optical signal in a first band. The first band can be C-band, L-band, or S-band, etc.

[0090] In step 1203, the first optical communication device transmits a third wavelength division multiplexed optical signal to the first wavelength processing device. The first optical communication device transmits a first optical signal of the first wavelength band to the first wavelength processing device. The first wavelength processing device can be any of the following devices: OADM, ROADM, MUX, DEMUX, or a combination of MUX and DEMUX.

[0091] In step 1204, the first optical communication device receives a first wavelength division multiplexed optical signal from the first wavelength processing device. The first wavelength division multiplexed optical signal includes a second optical signal in a first wavelength band. The wavelengths of the second optical signal and the first optical signal both belong to the first wavelength band. The wavelengths of the second optical signal and the first optical signal may be different or the same.

[0092] In step 1205, the first optical communication device combines the first mode-division multiplexed optical signal and the first wavelength-division multiplexed optical signal to obtain the first multiplexed optical signal.

[0093] In step 1206, the first optical communication device transmits the first multiplexed optical signal to the second optical communication device through the first optical fiber. For a description of step 1206, please refer to the foregoing. Figure 11 Description of step 1103.

[0094] The optical communication method provided in the embodiments of this application has been described above. The optical communication system provided in the embodiments of this application is described below. Figure 13 This is a first structural schematic diagram of the optical communication system provided in the embodiments of this application. For example... Figure 13 As shown, the optical communication system includes a first optical communication device 100 and a second optical communication device 1302. The first optical communication device 100 and the second optical communication device 1302 are connected via a first optical fiber 103. The first optical fiber 103 is a multimode fiber or a few-mode fiber. The first optical communication device 100 is used to combine a first mode-division multiplexed optical signal and a first wavelength-division multiplexed optical signal to obtain a first multiplexed optical signal. The first optical communication device 100 is also used to transmit the first multiplexed optical signal to the second optical communication device 1302 through the first optical fiber 103. 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 1302 is used to receive the first multiplexed optical signal through the first optical fiber.

[0095] It should be understood that the description of the optical communication system in the embodiments of this application can be referenced to the description of the aforementioned optical communication device 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. As another example, the optical communication system also includes a third optical communication device. The first optical communication device 100 is further configured to receive a third multiplexed optical signal from the 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 multiplexing optical signal and a first mode division multiplexing optical signal.

[0096] Figure 14 This is a second structural schematic diagram of the optical communication system provided in the embodiments of this application. For example... Figure 14 As shown, in Figure 13 Based on this, the optical communication system also includes a third optical communication device 1401 and a fourth optical communication device 1402. The third optical communication device 1401 and the fourth optical communication device 1402 are connected via optical fiber 1403. The third optical communication device 1401 and the first optical communication device 100 are connected via a second optical fiber 202. Figure 14 In this configuration, the second optical fiber 202 is used to transmit wavelength division multiplexed optical signals. The first optical fiber 103 and optical fiber 1403 are used to transmit multiplexed optical signals. The multiplexed optical signals include wavelength division multiplexed optical signals and mode division multiplexed optical signals.

[0097] In one example, such as Figure 14As shown, the second optical communication device 1302 is connected to WDM coherent transceiver 1409 and MDM coherent transceiver 1405. The first optical communication device 100 is connected to MDM coherent transceiver 1406. The third optical communication device 1401 is connected to MDM coherent transceiver 1407. The fourth optical communication device 1402 is connected to WDM coherent transceiver 1404 and MDM coherent transceiver 1408. The first optical fiber 103 is used to transmit mode-division multiplexed optical signals between MDM coherent transceiver 1405 and MDM coherent transceiver 1406. Optical fiber 1403 is used to transmit mode-division multiplexed optical signals 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 WDM coherent transceiver 1409 and WDM coherent transceiver 1404.

[0098] It should be understood that, Figure 14 In this context, coherent transceivers can be integrated into optical communication equipment. For example, WDM coherent transceiver 1409 and / or MDM coherent transceiver 1405 are integrated into the second optical communication equipment 1302. As another example, MDM coherent transceiver 1406 is integrated into the first optical communication equipment 100.

[0099] Figure 15 This is a third structural schematic diagram of the optical communication system provided in the embodiments of this application. For example... Figure 15 As shown, in Figure 14 Based on this, the first optical communication device 100 and the second optical communication device 1302 are also connected via a fourth optical fiber 1501. The first optical communication device 100 and the third optical communication device 1401 are also connected via a third optical fiber 1502. The third optical communication device 1401 and the fourth optical communication device 1402 are also connected via 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, the third optical fiber 1502, the fourth optical fiber 1501, and the optical fiber 1503 are used to transmit wavelength division multiplexed optical signals between the second optical communication device 1302 and the fourth optical communication device 1402.

[0100] It should be understood that, Figures 13 to 15 In this system, one or more intermediate devices may be included between any two optical communication devices. For example, intermediate devices A and B may be included between the first optical communication device 100 and the third optical communication device 1401. The intermediate devices can be used to amplify the optical signal to compensate for the loss of the optical signal during transmission. For example, the intermediate devices may be optical line amplifier (OLA) nodes or electrical regenerator (REG) nodes.

[0101] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. An optical communication method, characterized in that, include: The first optical communication device acquires the first mode-division multiplexed optical signal and the first wavelength-division multiplexed optical signal; The first optical communication device combines the first mode-division multiplexed optical signal and the first wavelength-division multiplexed optical signal to obtain a first multiplexed optical signal. The first optical communication device transmits the first multiplexed optical signal to the second optical communication device through 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, and the wavelength of the first mode division multiplexed optical signal is less than the cutoff wavelength of the first optical fiber.

2. The optical communication method according to claim 1, characterized in that, The method further includes: The first optical communication device receives a third wavelength division multiplexed optical signal from the third optical communication device through a second optical fiber. The third wavelength division multiplexed optical signal includes a first optical signal in the first wavelength band. The first optical communication device transmits the first optical signal to the first wavelength processing device; The first optical communication device acquires the first wavelength division multiplexed optical signal by receiving 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, characterized in that, The third wavelength division multiplexed optical signal also includes a third optical signal in the second wavelength band; The first optical communication device acquires the first wavelength division multiplexed optical signal by: combining the second optical signal and the third optical signal to obtain the first wavelength division multiplexed optical signal.

4. The optical communication method according to claim 2 or 3, characterized in that, The third wavelength division multiplexed optical signal includes the first optical monitoring channel (OSC) optical signal; The first optical communication device is further configured to generate a second OSC optical signal based on the first OSC optical signal, wherein the first wavelength division multiplexing optical signal includes the second OSC optical signal.

5. The optical communication method according to claim 1, characterized in that, The first optical communication device acquires the first wavelength division multiplexed optical signal by: the first optical communication device receiving the first wavelength division multiplexed optical signal from the third optical communication device through the second optical fiber; The method further includes: 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 including 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 according to claim 5, characterized in that, The second multiplexed optical signal also includes a second mode-division multiplexed optical signal; The first optical communication device is further configured to perform 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 optical communication method according to claim 2 or 3, characterized in that, The method further includes: The first optical communication device receives the fifth wavelength division multiplexed optical signal from the third optical communication device through 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.

8. The optical communication method according to claim 2 or 3, characterized in that, The second optical fiber is a single-mode optical fiber.

9. The optical communication method according to claim 2 or 3, characterized in that, The cutoff wavelength of the first optical fiber is between 1420nm and 1500nm.

10. An optical communication device, characterized in that, Includes a zone combiner and an optical signal interface, wherein: The band combiner is used to combine the first wavelength division multiplexed optical signal and the first mode division multiplexed optical signal to obtain the first multiplexed optical signal; The optical signal interface is used to transmit the first multiplexed optical signal to the second optical communication device through 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, and the wavelength of the first mode division multiplexed optical signal is less than the cutoff wavelength of the first optical fiber.

11. The optical communication device according to claim 10, characterized in that, The optical signal interface is also used to receive a third wavelength division multiplexed optical signal from a third optical communication device via a second optical fiber, the third wavelength division multiplexed optical signal including a first optical signal of a first wavelength band; The optical signal interface is also used to transmit the first optical signal to the first wavelength processing device; The optical signal interface is also used 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 according to claim 11, characterized in that, The device also includes a band demultiplexing unit and a band multiplexing unit; The wavelength division unit is used to divide the third wavelength division multiplexed optical signal to obtain the first optical signal of the first wavelength band and the third optical signal of the second wavelength band. The band multiplexing unit is used to multiplex the second optical signal and the third optical signal to obtain the first wavelength division multiplexed optical signal.

13. The optical communication device according to claim 12, characterized in that, The device also includes an optical monitoring channel OSC processing module, an OSC demultiplexing unit, and an OSC multiplexing unit; The OSC wavelength division unit is used to divide the third wavelength division multiplexed optical signal to obtain a first OSC optical signal and a 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 used to generate a second OSC optical signal based on the first OSC optical signal and transmit the second OSC optical signal to the OSC multiplexing unit. The OSC multiplexing unit is used to multiplex the second optical signal and the second OSC optical signal to obtain the first wavelength division multiplexed optical signal.

14. The optical communication device according to claim 10, characterized in that, The optical signal interface is also used 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 optical signal interface is also used to transmit the second wavelength division multiplexed optical signal to a third optical communication device via a second optical fiber.

15. The optical communication device according to claim 14, characterized in that, The second multiplexed optical signal also includes a second mode-division multiplexed optical signal, and the device further includes a mode-division multiplexing processing module; The bandgap combiner is used to demultiplex the second multiplexed optical signal to obtain the second mode-division multiplexed optical signal and the second wavelength-division multiplexed optical signal; The mode-division multiplexing processing module is used to process the second mode-division multiplexed optical signal.

16. The optical communication device according to any one of claims 11 to 15, characterized in that, The optical signal interface is also used to receive a fifth wavelength division multiplexed optical signal from the third optical communication device via a third optical fiber; The optical signal interface is also used to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device via the fourth optical fiber.

17. The optical communication device according to any one of claims 11 to 15, characterized in that, The second optical fiber is a single-mode optical fiber.

18. The optical communication device according to any one of claims 10 to 15, characterized in that, The cutoff wavelength of the first optical fiber is between 1420nm and 1500nm.

19. An optical communication system, characterized in that, It includes a first optical communication device and a second optical communication device, which are connected by a first optical fiber, which is a multimode fiber or a few-mode fiber, wherein: The first optical communication device is used to combine the first mode-division multiplexed optical signal and the first wavelength-division multiplexed optical signal to obtain the first multiplexed optical signal; The first optical communication device is used to transmit the first multiplexed optical signal to the second optical communication device through 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, and 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 used to receive the first multiplexed optical signal through the first optical fiber.

20. The optical communication system according to claim 19, characterized in that, The optical communication system further includes a third optical communication device and a first wavelength processing device, wherein 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 the third optical communication device via the second optical fiber, the third wavelength division multiplexed optical signal including a first optical signal of the first wavelength band; The first optical communication device is also used to transmit the first optical signal to the first wavelength processing device; The first wavelength processing device is also used 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 according to claim 20, characterized in that, The first wavelength division multiplexed optical signal and the third wavelength division multiplexed optical signal each include a third optical signal in the second wavelength band; The first optical communication device is also used to combine the second optical signal and the third optical signal to obtain the first wavelength division multiplexed optical signal.

22. The optical communication system according to claim 20 or 21, characterized in that, The third wavelength division multiplexed optical signal includes the first optical monitoring channel (OSC) optical signal; The first optical communication device is further configured to generate a second OSC optical signal based on the first OSC optical signal, wherein the first wavelength division multiplexing optical signal includes the second OSC optical signal.

23. The optical communication system according to claim 19, characterized in that, The optical communication system further includes a third optical communication device, which is connected to the first optical communication device via 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 via the first optical fiber, the second multiplexed optical signal including a second wavelength division multiplexed optical signal; The first optical communication device is also used 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 used to receive the second wavelength division multiplexed optical signal through the second optical fiber.

24. The optical communication system according to claim 23, characterized in that, The second multiplexed optical signal also includes a second mode-division multiplexed optical signal; The first optical communication device is further configured to perform 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. The optical communication system according to claim 20 or 21, characterized in that, The first optical communication device is also used 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 also used to transmit the fifth wavelength division multiplexed optical signal to the second optical communication device via the fourth optical fiber.

26. The optical communication system according to claim 20 or 21, characterized in that, The second optical fiber is a single-mode optical fiber.

27. The optical communication system according to claim 20 or 21, characterized in that, The cutoff wavelength of the first optical fiber is between 1420nm and 1500nm.

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