Optical communication system and device, and fault detection method and apparatus

Abstract

Disclosed are an optical communication system and device, and a fault detection method and apparatus, relating to the technical field of optical communications. The system comprises a first optical communication device and a second optical communication device connected via a first optical fiber link. The first optical communication device comprises a first WSS, a second WSS, and a first output unit. An input end of the second WSS is configured to receive a service optical signal output by an output end of the first WSS. The first output unit is configured to: when an output end of the second WSS outputs the service optical signal, output a first optical signal via the first optical fiber link; or, when the output end of the second WSS does not output the service optical signal, output a second optical signal via the first optical fiber link, the optical power of the second optical signal being greater than or equal to the nominal output power of a single-wavelength optical signal. The second optical communication device is configured to receive the first or second optical signal and detect the optical power of the received optical signal. The invention enables rapid detection of a fault in an OMS in which the first optical fiber link is located.

Description

Optical communication systems and equipment, fault detection methods and devices

[0001] This application claims priority to Chinese Patent Application No. 202411441980.9, filed on October 15, 2024, entitled "Optical Communication System and Equipment, Fault Detection Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical communication technology, and in particular to an optical communication system and equipment, a fault detection method and apparatus. Background Technology

[0003] With the rapid development of communication technology, optical transport network (OTN) has become the mainstream technology for transport networks due to its advantages such as the ability to flexibly schedule and manage large-capacity services.

[0004] In related technologies, an OTN-based optical communication system includes a first optical communication device and a second optical communication device. The first and second optical communication devices are connected via an optical fiber link. The first optical communication device includes a first wavelength selective switch (WSS), a second WSS, and an optical amplifier (OA). The output of the first WSS is used to output a service optical signal. The input of the second WSS is connected to the output of the first WSS and is used to receive the service optical signal output from the first WSS. When the second WSS outputs a service optical signal, the OA amplifies the service optical signal and transmits it to the second optical communication device via the optical fiber link. When the second WSS does not output a service optical signal, it does not transmit an optical signal to the second optical communication device. The second optical communication device receives the optical signal via the optical fiber link and detects the optical power of the received optical signal.

[0005] If the output of the second WSS does not output a service optical signal, or if the fiber optic link is faulty, the second optical communication device will be unable to receive optical signals normally through that fiber optic link. In this case, the second optical communication device detects extremely low optical power in the optical signal received through the fiber optic link and generates an alarm. The failure of the second WSS to output a service optical signal could be due to a fault in the second WSS or a fault in the upstream optical communication equipment of the second WSS. A fault in the fiber optic link and a fault in the second WSS indicate a fault in the optical multiplex section (OMS) where the fiber optic link resides; a fault in the upstream optical communication equipment of the second WSS indicates a fault in the upstream OMS of the OMS where the fiber optic link resides. Therefore, when the second optical communication device detects extremely low optical power in the optical signal received through the fiber optic link, it cannot directly reflect whether the OMS where the fiber optic link resides is faulty. It is necessary to collect alarm information from multiple optical communication devices related to multiple OMS segments and to use complex judgment logic to determine whether the OMS where the fiber optic link resides is faulty, which is slow and inefficient. Summary of the Invention

[0006] This application provides an optical communication system and device, a fault detection method and apparatus, which can quickly detect faults in the OMS.

[0007] In a first aspect, this application provides an optical communication system. The optical communication system includes a first optical communication device and a second optical communication device, which are connected via a first optical fiber link. The first optical communication device includes a first WSS, a second WSS, and a first output unit. The output terminal of the first WSS is used to output a service optical signal. The input terminal of the second WSS is connected to the output terminal of the first WSS and is used to receive the service optical signal output from the output terminal of the first WSS. The first output unit is connected to the output terminal of the second WSS and is used to output a first optical signal via the first optical fiber link when the output terminal of the second WSS outputs a service optical signal, the first optical signal including the service optical signal; or, when the output terminal of the second WSS does not output a service optical signal, to output a second optical signal via the first optical fiber link, the optical power of the second optical signal being greater than or equal to the nominal output power of a single-wavelength optical signal. The second optical communication device is used to receive the first optical signal or the second optical signal via the first optical fiber link, and to detect the optical power of the received first optical signal or the second optical signal.

[0008] In this application, when the second WSS outputs a service optical signal, since the service optical signal includes at least one single-wavelength optical signal, the optical power of the first optical signal transmitted by the first output unit is necessarily greater than or equal to the nominal output power of the single-wavelength optical signal. When the first output unit does not output a service optical signal at the output of the second WSS, it outputs a second optical signal through the first optical fiber link, and the optical power of the second optical signal is greater than or equal to the nominal output power of the single-wavelength optical signal. Therefore, regardless of whether the second WSS outputs a service optical signal, the optical power of the optical signal transmitted by the first output unit to the second optical communication device through the first optical fiber link is always greater than or equal to the nominal output power of the single-wavelength optical signal. Therefore, if the second optical communication device detects that the optical power of the first or second optical signal is too low, it indicates that the first OMS, where the first optical fiber link is located, is faulty. Thus, the magnitude of the optical power of the first or second optical signal detected by the second optical communication device can directly reflect the fault of the first OMS, which is beneficial to improving the fault detection speed and efficiency of the first OMS.

[0009] Optionally, the first optical communication device and the second optical communication device are reconfigurable optical add-drop multiplexers (ROADMs).

[0010] Optionally, if no service optical signal is output at the output end of the second WSS, the second optical signal can be output through the first optical fiber link in either of the following two ways.

[0011] The first type includes a first output unit (OA), whose input is connected to the output of the second WSS, and whose output is connected to a first optical fiber link. The first OA is configured to maintain an output power greater than or equal to the nominal output power.

[0012] In this first method, by configuring the first OA, the output power of the first OA is always kept greater than or equal to the nominal output power, without changing the existing structure of the first node, and the implementation method is simple.

[0013] Optionally, the first OA is configured to adjust its pump power so that its output power is greater than or equal to the nominal output power when the output power of the first OA is less than the nominal output power. Typically, the OA used in OTN is a pump OA. For a pump OA, even when the input optical power is 0, adjusting the pump power can still make the output power of the pump OA reach the nominal output power.

[0014] In the second embodiment, the first output unit includes a first OA and a light source. The input terminal of the first OA is connected to the output terminal of the second WSS, and the output terminal of the first OA is connected to the first optical fiber link. The light source is connected to the input terminal of the second WSS and is used to provide a detection optical signal to the input terminal of the second WSS, so that the output power of the first OA is greater than or equal to the nominal output power.

[0015] In this second approach, by adding a light source to the first node to provide a detection optical signal, which is directly provided to the second WSS, it can be ensured that the minimum optical power output by the second WSS to the first OA is equal to the optical power of the detection optical signal. This detection optical signal is used to make the output power of the first OA greater than or equal to the nominal output power.

[0016] Optionally, the second optical communication device is further configured to generate first indication information based on the optical power of the detected first optical signal or the second optical signal. The first indication information is used to indicate a first relationship between the optical power of the detected first optical signal or the second optical signal and a first power threshold. The first relationship is used to reflect whether there is a fault in the first OMS where the first optical fiber link is located. The first power threshold is less than the nominal output power.

[0017] The first indication information can more intuitively determine the relationship between the optical power of the first optical signal or the second optical signal and the first power threshold, thereby determining whether there is a fault in the first OMS where the first optical fiber link is located.

[0018] Optionally, the optical communication system further includes a management device for determining whether the first OMS is faulty based on the first indication information.

[0019] For example, the management device is used to determine that the first OMS is faulty when the first indication information indicates that the optical power of the detected first optical signal or the second optical signal is less than the first power threshold.

[0020] Optionally, the management device is further configured to determine whether the first OMS is faulty based on the status of the second WSS and the status of the first OA. The status of the second WSS refers to whether the input service optical signal of the second WSS is lost, and the status of the first OA refers to whether the input service optical signal of the first OA is lost. In this application, input service optical signal loss means that the optical power of the service optical signal received at the input terminal is less than a loss threshold, for example, the optical power of the service optical signal received at the input terminal is 0. Exemplarily, the management device is configured to determine that the first OMS is faulty when either the status of the second WSS or the status of the first OA indicates that the input service optical signal is lost.

[0021] In this scenario, the first OMS is divided into two segments: one within the first optical communication device and the other between the first and second optical communication devices. If the first WSS (Wideband Service Shield) or the first OA (Optical Opening Shield) is in a state of input service optical signal loss, it indicates a fault within the first optical communication device. In this case, the first OMS is faulty regardless of whether there is a fault in the segment between the first and second optical communication devices. For the segment between the first and second optical communication devices, since the first OA is configured to maintain an output power greater than or equal to the nominal output power, if the detected optical power of the first or second optical signal is less than the first power threshold, it indicates a fault in this segment. In this case, the first OMS is faulty regardless of whether there is a fault within the first optical communication device. Conversely, when both the first WSS and the first OA are in a state of no input service optical signal loss, it indicates no fault within the first optical communication device; and if the detected optical power of the first or second optical signal is greater than or equal to the first power threshold, it indicates no fault in the segment between the first and second optical communication devices. At this point, there is no fault in the first OMS.

[0022] Optionally, the first optical communication device and the second optical communication device are further connected via a second optical fiber link. When the first optical communication device and the second optical communication device are connected via the first optical fiber link and the second optical fiber link, the first optical communication device includes a first WSS, a second WSS, a first optical switch, a first output unit, and a second output unit. The input terminal of the first optical switch is connected to the output terminal of the second wavelength selective switch, one output terminal of the first optical switch is connected to the first output unit, and the other output terminal of the first optical switch is connected to the second output unit. The second output unit is used to output a third optical signal via the second optical fiber link when the service optical signal is output at the output terminal of the second wavelength selective switch, the third optical signal including the service optical signal; or, when the service optical signal is not output at the output terminal of the second wavelength selective switch, it is used to output a fourth optical signal via the second optical fiber link, the optical power of the fourth optical signal being greater than or equal to the nominal output power of the single-wavelength optical signal. The second optical communication device is also used to receive the third optical signal or the fourth optical signal via the second optical fiber link, and to detect the optical power of the received third optical signal or the fourth optical signal.

[0023] Optionally, if the second output unit does not output the service optical signal at the output terminal of the second WSS, the way it outputs the fourth optical signal can be the same as the way the first output unit outputs the second optical signal.

[0024] In some examples, the second output unit includes a second OA, the input of which is connected to the output of the second WSS via a first optical switch, and the output of the second OA is connected to a second optical fiber link. The second OA is configured to maintain an output power greater than or equal to the nominal output power.

[0025] In other examples, the second output unit includes a second OA and a light source. The input of the second OA is connected to the output of the second WSS via a first optical switch, and the output of the second OA is connected to the first optical fiber link. The light source is connected to the input of the second WSS to provide a detection optical signal to the input of the second WSS, so that the output power of the second OA is greater than or equal to the nominal output power.

[0026] Optionally, the second output unit can share a light source with the first output unit to simplify the device structure and save costs.

[0027] Optionally, the second optical communication device is further configured to generate second indication information based on the detected optical power of the third optical signal or the fourth optical signal. The second indication information is used to indicate a second relationship between the detected optical power of the third optical signal or the fourth optical signal and a second power threshold. The second relationship is used to reflect whether there is a fault in the second optical multiplexing section where the second optical fiber link is located, wherein the second power threshold is less than the nominal output power.

[0028] When the first optical communication device sends an optical signal to the second optical communication device through the second optical fiber link, by ensuring that the optical power of the optical signal sent by the first optical communication device is always greater than or equal to the nominal output power, it is possible to determine whether there is a fault in the second OMS where the second optical fiber link is located by using the optical power of the third or fourth optical signal detected by the second optical communication device. This helps to improve the fault detection speed and efficiency of the second OMS.

[0029] Optionally, the management device is further configured to instruct the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and to instruct the second optical communication device to receive an optical signal via the second optical fiber link. For example, the management device is configured to instruct the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and to instruct the second optical communication device to receive an optical signal via the second optical fiber link when the first OMS fails.

[0030] Optionally, the management device is configured to, when the state of the second WSS is that the input service optical signal has not been lost, the state of the second OA is that the input service optical signal has not been lost, and the optical power of the first optical signal or the second optical signal detected by the first indication information is less than the first power threshold, instruct the first optical communication device to send an optical signal to the second optical communication device through the second optical fiber link, and instruct the second optical communication device to receive an optical signal through the second optical fiber link.

[0031] Before switching to transmit optical signals via the second fiber optic link, the status of the second WSS and the second OA should be determined. If the status of the second WSS and the second OA are both confirmed to be that the input service optical signal has not been lost, then the transmission of optical signals can be switched to the second fiber optic link. This can reduce the possibility of discovering a fault in the second OMS after the switch and further improve the transmission performance of the optical communication system.

[0032] Secondly, an optical communication device is also provided, the structure of which is the same as that of the aforementioned first optical communication device.

[0033] Thirdly, a fault detection method is also provided. This fault detection method is implemented based on the aforementioned optical communication system and can be executed by a second optical communication device. The fault detection method includes: detecting the optical power of a first optical signal or a second optical signal received through a first optical fiber link; generating first indication information based on the detected optical power of the first optical signal or the second optical signal, wherein the first indication information is used to indicate a first relationship between the detected optical power of the first optical signal or the second optical signal and a first power threshold, wherein the first relationship is used to reflect whether a fault exists in the first OMS where the first optical fiber link is located, and the first power threshold is less than the nominal output power.

[0034] Optionally, when the first optical communication device and the second optical communication device are also connected via a second optical fiber link, the fault detection method further includes: detecting the optical power of a third optical signal or a fourth optical signal received through the second optical fiber link; generating second indication information based on the detected optical power of the third optical signal or the fourth optical signal, the second indication information being used to indicate a second relationship between the detected optical power of the third optical signal or the fourth optical signal and a second power threshold, the second relationship being used to reflect whether there is a fault in the second OMS where the second optical fiber link is located, and the second power threshold being less than the nominal output power.

[0035] Fourthly, a fault detection device is also provided, which is implemented based on the aforementioned optical communication system. The fault detection device includes a detection module and a generation module. The detection module is used to detect the optical power of a first optical signal or a second optical signal received through a first optical fiber link; the generation module is used to generate first indication information based on the detected optical power of the first optical signal or the second optical signal. The first indication information indicates a first relationship between the detected optical power of the first optical signal or the second optical signal and a first power threshold. The first relationship reflects whether a fault exists in the first optical multiplexing section where the first optical fiber link is located, and the first power threshold is less than the nominal output power.

[0036] Optionally, when the first optical communication device and the second optical communication device are also connected via a second optical fiber link, the detection module is further configured to detect the optical power of a third or fourth optical signal received via the second optical fiber link, and the generation module is further configured to generate second indication information based on the detected optical power of the third or fourth optical signal. The second indication information is used to indicate a second relationship between the detected optical power of the third or fourth optical signal and a second power threshold. The second relationship is used to reflect whether there is a fault in the second OMS where the second optical fiber link is located, and the second power threshold is less than the nominal output power.

[0037] Fifthly, a fault detection method is also provided, which is implemented based on the aforementioned optical communication system and can be executed by a management device. The fault detection method includes: receiving first indication information sent by a second optical communication device, the first indication information indicating a first relationship between the optical power of a first optical signal or a second optical signal detected by the second optical communication device and a first power threshold, the first optical signal and the second optical signal being transmitted through a first optical fiber link, the first relationship reflecting whether a fault exists in a first OMS where the first optical fiber link is located, and the first power threshold being less than the nominal output power; and determining whether a fault exists in the first OMS based on the first indication information.

[0038] Optionally, determining whether the first OMS is faulty based on the first indication information includes: determining that the first OMS is faulty when the first indication information indicates that the optical power of the first optical signal or the second optical signal detected by the second optical communication device is less than the first power threshold.

[0039] Optionally, the first optical communication device and the second optical communication device are further connected via a second optical fiber link. The fault detection method further includes: instructing the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and instructing the second optical communication device to receive an optical signal via the second optical fiber link; receiving second indication information sent by the second optical communication device, the second indication information indicating a second relationship between the optical power of a third or fourth optical signal detected by the second optical communication device and a second power threshold, the third and fourth optical signals being transmitted via the second optical fiber link, the second relationship reflecting whether a fault exists in the second OMS where the second optical fiber link is located; and determining whether a fault exists in the second OMS based on the second indication information.

[0040] Optionally, instructing the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and instructing the second optical communication device to receive an optical signal via the second optical fiber link includes: when the state of the second WSS is that the input service optical signal has not been lost, the state of the second OA is that the input service optical signal has not been lost, and the optical power of the first optical signal or the second optical signal detected by the first indication information is less than the first power threshold, instructing the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and instructing the second optical communication device to receive the optical signal via the second optical fiber link.

[0041] Sixthly, a fault detection device is also provided, which is implemented based on the aforementioned optical communication system. The fault detection device includes a receiving module and a determining module. The receiving module is used to receive first indication information sent by a second optical communication device. The first indication information indicates a first relationship between the optical power of a first optical signal or a second optical signal detected by the second optical communication device and a first power threshold. The first optical signal and the second optical signal are transmitted through a first optical fiber link. The first relationship reflects whether a fault exists in a first OMS where the first optical fiber link is located. The first power threshold is less than the nominal output power. The determining module is used to determine whether a fault exists in the first OMS based on the first indication information.

[0042] Optionally, the determining module is configured to determine that the first OMS is faulty when the first indication information indicates that the optical power of the first optical signal or the second optical signal detected by the second optical communication device is less than the first power threshold.

[0043] Optionally, the first optical communication device and the second optical communication device are further connected via a second optical fiber link. The device also includes an indication module. The indication module is used to instruct the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and to instruct the second optical communication device to receive an optical signal via the second optical fiber link. The receiving module is further used to receive second indication information sent by the second optical communication device. The second indication information indicates a second relationship between the optical power of a third or fourth optical signal detected by the second optical communication device and a second power threshold. The third and fourth optical signals are transmitted via the second optical fiber link, and the second relationship reflects whether a fault exists in the second OMS where the second optical fiber link is located. The determining module is further used to determine whether a fault exists in the second OMS based on the second indication information.

[0044] Optionally, the indication module is configured to, when the state of the second WSS is that the input service optical signal has not been lost, the state of the second OA is that the input service optical signal has not been lost, and the optical power of the first optical signal or the second optical signal detected by the first indication information is less than the first power threshold, instruct the first optical communication device to send an optical signal to the second optical communication device through the second optical fiber link, and instruct the second optical communication device to receive the optical signal through the second optical fiber link.

[0045] In a seventh aspect, a fault detection device for an OMS is provided, comprising a processor and a memory; the memory is used to store software programs, and the processor implements any of the methods provided in the third or fifth aspect by running or executing the software programs stored in the memory.

[0046] Eighthly, a computer-readable storage medium is provided for storing program code executed by a processor, the program code including instructions for implementing any one of the methods provided in the third or fifth aspects above.

[0047] Ninthly, a computer program product is provided that, when run on a computer, causes the computer to perform any of the methods provided in the third or fifth aspects described above. Attached Figure Description

[0048] Figure 1 is a schematic diagram of the structure of an optical communication system provided in an embodiment of this application;

[0049] Figure 2 is a schematic diagram of the structure of a ROADM provided in an embodiment of this application;

[0050] Figure 3 is a schematic diagram of another optical communication system provided in an embodiment of this application;

[0051] Figure 4 is a schematic diagram showing the relationship between the input power and output power of the first OA;

[0052] Figure 5 is a schematic diagram of another optical communication system provided in an embodiment of this application;

[0053] Figure 6 is a schematic diagram of another optical communication system provided in an embodiment of this application;

[0054] Figure 7 is a flowchart illustrating a fault detection method provided in an embodiment of this application;

[0055] Figure 8 is a flowchart illustrating another fault detection method provided in an embodiment of this application;

[0056] Figure 9 is a schematic diagram of a fault detection device provided in an embodiment of this application;

[0057] Figure 10 is a schematic diagram of another fault detection device provided in an embodiment of this application;

[0058] Figure 11 is a schematic diagram of another fault detection device provided in an embodiment of this application. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0060] This application provides an optical communication system. Figure 1 is a schematic diagram of the structure of the optical communication system provided in this application. As shown in Figure 1, the optical communication system includes a first optical communication device 11 and a second optical communication device 12, which are connected by a first optical fiber link 10a.

[0061] The first optical communication device 11 includes a first WSS 111, a second WSS 112, and a first output unit 113. The output terminal of the first WSS 111 is used to output a service optical signal. The input terminal of the second WSS 112 is connected to the output terminal of the first WSS 111 and is used to receive the service optical signal output from the output terminal of the first WSS 111. The first output unit 113 is connected to the output terminal of the second WSS 112. The first output unit 113 is used to output a first optical signal, including the service optical signal, through the first optical fiber link 10a when the output terminal of the second WSS 112 outputs a service optical signal; or, when the output terminal of the second WSS 112 does not output a service optical signal, it is used to output a second optical signal, the optical power of which is greater than or equal to the nominal output power of a single-wavelength optical signal, through the first optical fiber link 10a. Here, the first output unit 113 can output different optical signals (i.e., a first optical signal including the service optical signal or a second optical signal not including the service optical signal) through the first optical fiber link 10a under different conditions or at different time periods. The second optical communication device 12 is used to receive a first optical signal or a second optical signal through the first optical fiber link 10a, and to detect the optical power of the received first optical signal or second optical signal.

[0062] In this embodiment, the segment starting from the input end of the second WSS112, passing through the first optical fiber link 10a, and ending at the output end of the receiving WSS connected to the first optical fiber link 10a in the second optical communication device 12 is called the first OMS. The first OMS carries multiple optical channels (OCHs), each OCH used to transmit an optical signal of one wavelength, and different OCHs used to transmit optical signals of different wavelengths. Each wavelength optical signal is a single-wavelength optical signal. This embodiment does not limit the number of OCHs carried by the first OMS or the wavelengths corresponding to the OCHs.

[0063] In this embodiment, the output of the second WSS (Software Suppressor) outputs a service optical signal, indicating that the second WSS is not faulty and its input service optical signal has not been lost. In this case, the first output unit sends a first optical signal to the second optical communication device through the first optical fiber link, and this first optical signal includes the service optical signal. Since the service optical signal includes at least one single-wavelength optical signal, the optical power of the first optical signal output by the first output unit must be greater than or equal to the nominal output power of the single-wavelength optical signal. If the first optical fiber link is normal, the second optical communication device can receive the first optical signal normally, and the optical power of the first optical signal detected by the second optical communication device is relatively high; if the first optical fiber link is faulty, the second optical communication device cannot receive the second optical signal normally, and the optical power of the first optical signal detected by the second optical communication device will be extremely low.

[0064] If the second WSS does not output a service optical signal, it indicates that the second WSS is faulty or its input service optical signal is lost. In this case, the first output unit outputs a second optical signal through the first optical fiber link, and the optical power of the second optical signal is greater than or equal to the nominal output power of the single-wavelength optical signal. If the first optical fiber link is normal, the second optical communication device can receive the second optical signal normally, and the optical power of the second optical signal detected by the second optical communication device is relatively high; if the first optical fiber link is faulty, the second optical communication device cannot receive the second optical signal normally, and the optical power of the second optical signal detected by the second optical communication device will be extremely low.

[0065] Therefore, the magnitude of the optical power of the second optical signal detected by the second optical communication device can reflect whether there is a fault in the first optical fiber link. If the first optical fiber link is faulty, then the first OMS where the first optical fiber link is located must also be faulty, thus the fault of the first OMS can be quickly determined, which is beneficial to improving the fault detection speed of the first OMS and improving the fault detection efficiency.

[0066] In this embodiment of the application, the loss of the input service optical signal of a certain device means that the optical power of the service optical signal received at the input end of the device is less than the loss threshold.

[0067] In this embodiment, the first optical fiber link 10a includes at least an optical fiber and a connector. In some examples, the first optical fiber link 10a may also include multiple other optical communication devices located between the first optical communication device and the second optical communication device, such as an optical line amplifier (OLA). A fault in the first optical fiber link 10a can be an optical fiber fault (e.g., a break), a connector fault, or a fault in other optical communication devices.

[0068] In this embodiment, the nominal output power of the single-wavelength optical signal can be set according to system performance. It is necessary to ensure that, under fault-free conditions of the first optical communication device (OMS), the first optical communication device 11 can transmit any single-wavelength optical signal at this nominal output power. After the single-wavelength optical signal is transmitted to the second optical communication device 12 via the first optical fiber link 10a, the second optical communication device 12 can normally identify the single-wavelength optical signal. For example, the nominal output power can be from 5dBm to -5dBm; for instance, for a wavelength with a bandwidth of 50G, the nominal output power is 1.7dBm.

[0069] Optionally, the second optical communication device 12 is further configured to generate first indication information based on the optical power of the detected first optical signal or second optical signal. The first indication information is used to indicate a first relationship between the optical power of the detected first optical signal or second optical signal and a first power threshold. The first relationship is used to reflect whether the first OMS is faulty, and the first power threshold is less than the nominal output power.

[0070] The first power threshold is used to measure whether the optical signal sent by the first optical communication device 11 can be normally transmitted to the second optical communication device 12 through the first optical fiber link 10a. The first power threshold can be set according to system performance, for example, according to the attenuation of the optical signal by the first optical fiber link 10a. If the first optical fiber link 10a is fault-free, the optical signal power will decrease during transmission. Therefore, when the optical signal reaches the second optical communication device 12, the optical power detected by the second optical communication device 12 will usually be less than the output optical power of the first optical communication device 11 for the optical signal. However, the received optical power of the second optical communication device 12 will be large enough to properly identify the optical signal and obtain the information carried by the optical signal. If the first optical fiber link 10a is faulty, the optical signal cannot reach the second optical communication device 12 normally, and the optical power of the optical signal detected by the second optical communication device 12 will be very small. Therefore, the first power threshold needs to be less than the nominal output power and needs to be small enough to determine whether the optical signal output by the first optical communication device 11 can be normally transmitted to the second optical communication device 12 through the first optical fiber link 10a.

[0071] For example, the first power threshold can be from 3dBm to -35dBm, such as -20dBm or -30dBm, but the first power threshold must be less than the nominal output power.

[0072] In this embodiment, the optical communication device is also referred to as a site, network element, network device, or node, etc., and can flexibly schedule optical signals in all directions. For example, the optical communication device can be a device such as a ROADM that can flexibly schedule optical signals.

[0073] Optionally, the optical communication system further includes a management device 13, which is communicatively connected to the first optical communication device 11 and the second optical communication device 12, respectively, to monitor and manage the first optical communication device 11 and the second optical communication device 12. The communication connection can be wired, wireless, or network-based.

[0074] In some embodiments, the second optical communication device 12 is further configured to send first indication information to the management device 13 so that the management device 13 can determine whether the first OMS is faulty based on the first indication information.

[0075] In other embodiments, the second optical communication device 12 outputs the first indication information through a display device, so that staff can determine whether the first OMS is faulty based on the first indication information. Here, the display device can be built into the second optical communication device 12; or it can be set separately from the second optical communication device 12 and communicate with the second optical communication device 12 through wired or wireless means.

[0076] The first indication information can more intuitively determine the relationship between the optical power of the first optical signal or the second optical signal and the first power threshold, thereby determining whether there is a fault in the first OMS where the first optical fiber link is located.

[0077] The following will use ROADM as an example to describe the embodiments of this application in detail. To facilitate understanding of the embodiments of this application, the structure and working principle of ROADM will be introduced first with reference to Figure 2.

[0078] As shown in Figure 2, the ROADM 20 includes add / drop units 21 and multiple scheduling units 22. Each scheduling unit 22 corresponds to a dimension (also known as a line direction) and is used to receive service optical signals from other optical communication devices connected in that dimension and / or send service optical signals to other optical communication devices connected in that dimension. The add / drop unit 21 is connected to the scheduling unit 22 of each dimension. The add / drop unit 21 is used to add local wavelengths and transmit the added wavelengths to the scheduling unit 22 on the connected line side; and to de-drop at least a portion of the wavelengths from the scheduling unit 22 on the connected line side. Here, the wavelength refers to the aforementioned single-wavelength optical signal.

[0079] Each scheduling unit 22 includes a transmitting subunit and a receiving subunit. The transmitting subunit includes a transmitting WSS221a and a transmitting OA 222a. The transmitting WSS221a is used to receive the wavelengths of the local optical signal and service optical signals from other dimensions, and to combine the received optical signals before outputting them to the transmitting OA 222a. After amplification by the transmitting OA 222a, the signals are transmitted through a fiber interface unit (FIU) (not shown) into the long fiber for transmission. The receiving subunit includes a receiving WSS221b and a receiving OA 222b. The receiving OA 222b is used to receive the service optical signals output from the long fiber in its current dimension through the FIU (not shown), amplify the received service optical signals, and output them to the receiving WSS221b. The receiving WSS221b outputs the optical signals of each wavelength in the service optical signal to the transmitting WSS221a or the add / drop unit 21 in the scheduling unit 22 of the corresponding dimension.

[0080] Optionally, to detect whether the input service optical signal of the transmitting WSS221a is lost, the transmitting subunit further includes a first optical splitter 223a and a first photodetector 224a. The input of the first optical splitter 223a is connected to the output of the transmitting WSS221a, and it splits the multiplexed signal output by the transmitting WSS221a into two paths: one path is output to the transmitting OA222a, and the other path is output to the first photodetector 224a. The first photodetector 224a is used to separate the received optical signal according to wavelength and detect the separated wavelength optical signals to determine whether the input service optical signal of the transmitting WSS221a is lost.

[0081] Optionally, to detect whether the input service optical signal of the transmitting OA 222a is lost, the transmitting subunit further includes a second optical splitter 225a and a second optical detector 226a. The input end of the second optical splitter 225a is connected to the optical fiber between the transmitting WSS 221a and the transmitting OA 222a, and is positioned close to the input end of the transmitting OA 222a. It splits the combined signal transmitted in the optical fiber between the transmitting WSS 221a and the transmitting OA 222a into two paths: one path is output to the transmitting OA 222a, and the other path is output to the second optical detector 226a. The second optical detector 226a is used to detect the optical power of the received optical signal, thereby determining whether the input service optical signal of the transmitting OA 222a is lost.

[0082] Optionally, to detect whether the input service optical signal received by WSS221b has been lost, the receiving subunit further includes a third optical splitter 223b and a third optical detector 224b. The input end of the third optical splitter 223b is connected to the optical fiber between the receiving WSS221b and the receiving OA 222b, and is positioned close to the input end of the receiving WSS221b. It splits the optical signal output by the receiving OA 222b into two paths: one path is output to the receiving WSS 221b, and the other path is output to the third optical detector 224b. The third optical detector 224b is used to detect the optical power of the received optical signal, thereby determining whether the input service optical signal received by WSS221b has been lost.

[0083] Optionally, to detect whether the input service optical signal of the receiving OA 222b is lost, the receiving subunit further includes a fourth optical splitter 225b and a fourth optical detector 226b. The input of the fourth optical splitter 225b is connected to the output of the FIU (not shown) and is positioned close to the input of the receiving OA 222b. It splits the optical signal output by the FIU into two paths: one path is output to the receiving OA 222b, and the other path is output to the second optical detector 226b. The second optical detector 226b is used to detect the optical power of the received optical signal, thereby determining whether the input service optical signal of the receiving OA 222b is lost.

[0084] It should be noted that, for ease of illustration, only the structure of the topmost scheduling unit 22 for detecting whether the input service optical signal of each optical device is lost is shown in Figure 2. This application is not limited to this, and the same structure can be arranged in other scheduling units 22.

[0085] This application does not limit the splitting ratio of each beam splitter, and it can be set according to actual needs. For example, it can be 0.5:99.5 or 1:99, etc. The lower-power output is sent to the corresponding photodetector.

[0086] Figure 3 is a schematic diagram of an optical communication system provided in an embodiment of this application. As shown in Figure 3, the optical communication system includes a first optical communication device 11, a second optical communication device 12, and a management device 13. The first optical communication device 11 and the second optical communication device 12 are connected via a first optical fiber link 10a. The management device 13 is communicatively connected to both the first optical communication device 11 and the second optical communication device 12.

[0087] The first optical communication device 11 includes a first WSS 111, a second WSS 112, and a first output unit 113. The output terminal of the first WSS 111 is used to output service optical signals. The input terminal of the second WSS 112 is connected to the output terminal of the first WSS 111 and is used to receive the service optical signals output by the output terminal of the first WSS 111.

[0088] The first output unit 113 includes a first OA 1131, the input terminal of which is connected to the output terminal of the second WSS 112. In the embodiment shown in FIG3, the input terminal of the first OA 1131 and the output terminal of the second WSS 112 can be directly connected via a pigtail (referring to a short optical fiber). In other embodiments, the input terminal of the first OA 1131 and the output terminal of the second WSS 112 can be indirectly connected via other optical devices, and this application embodiment does not limit this.

[0089] The output of the first OA 1131 is connected to one end of the first optical fiber link 10a. The first OA 1131 is configured to maintain an output power greater than or equal to the nominal output power, so that the output optical power of the first optical communication device 11 in the first OMS is greater than or equal to the nominal output power of the single-wavelength optical signal.

[0090] In some examples, the first OA 1131 is configured to adjust its pump power until the output power of the first OA 1131 is greater than or equal to the nominal output power when the output power of the first OA 1131 is less than the nominal output power. Typically, the OAs used in OTN are pump OAs. For pump OAs, even when the input optical power is low, such as essentially zero, adjusting the pump power can still make the output power of the pump OA reach or exceed the nominal output power.

[0091] Figure 4 is a schematic diagram illustrating the relationship between the input power and output power of the first optical amplifier (OA). As shown in Figure 4, in related technologies, when the input optical power of the first OA is low, the first OA still operates in gain-locked mode or automatic gain control (AGC) mode, outputting the signal after normal gain adjustment. Under normal gain, the output power will be lower than the nominal output power, as shown by the portion of the ellipse in Figure 4 representing the output power under normal gain. However, in this embodiment, when the input optical power of the first OA is high, the first OA operates in gain-locked mode; and when the input optical power of the first OA is low, the first OA operates in power-locked mode, and the output power of the first OA is locked at the nominal output power of the single-wavelength optical signal. In other embodiments, the output power of the first OA can also be locked at a set power value greater than the nominal output power of the single-wavelength optical signal. That is, the output power of the first OA is always maintained at or above the nominal output power.

[0092] The second optical communication device 12 includes a third WSS 121 and a third OA 122. The input of the third OA 122 is connected to the other end of the first optical fiber link 10a. The output of the third OA 122 is connected to the input of the third WSS 121. The output of the third WSS 121 is connected to other scheduling units or add / drop units in the second optical communication device 12. The third OA 122 is the receiving OA in Figure 2, and the third WSS 121 is the receiving WSS in Figure 2. The optical power obtained by the second optical communication device 12 from the optical signal received through the first optical fiber link 10a can be called the received optical power of the second optical communication device 12 in the first OMS. This received optical power can be the optical power at the input of the third OA 122 or the optical power at the input of the second WSS 121.

[0093] Optionally, the second optical communication device 12 is further configured to generate first indication information based on the optical power of the detected first optical signal or second optical signal and to send the first indication information to the management device 13. The first indication information is used to indicate a first relationship between the optical power of the detected first optical signal or second optical signal and a first power threshold, the first relationship being used to reflect whether the first OMS is faulty, and the first power threshold being less than the nominal output power.

[0094] In some examples, the second optical communication device 12 generates the first indication information only when the optical power of the detected first optical signal or the second optical signal is less than the first power threshold. In this case, the first indication information is essentially an alarm message.

[0095] In this embodiment, the management device 13 is used to determine whether the first OMS is faulty based on at least one of the status of the second WSS112, the status of the first OA 1131, and the first indication information. The status of the second WSS112 refers to whether the input service optical signal of the first WSS111 is lost, and the status of the first OA 1131 refers to whether the input service optical signal of the first OA 1131 is lost.

[0096] For example, the management device 13 determines whether the first OMS is faulty in the following ways: when the state of the second WSS112 is that the input service optical signal is lost or the state of the first OA 1131 is that the input service optical signal is lost, the first OMS is determined to be faulty; or, when the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than the first power threshold, the first OMS is determined to be faulty.

[0097] In this scenario, the first OMS is divided into two segments: one within the first optical communication device 11, and the other between the first optical communication device 11 and the second optical communication device 12. If the second WSS 112 or the first OA 1131 is in a state of input service optical signal loss, it indicates a fault within the segment of the first optical communication device 11. In this case, regardless of whether there is a fault in the segment between the first optical communication device 11 and the second optical communication device 12, the first OMS is faulty. For the segment between the first optical communication device 11 and the second optical communication device 12, since the first OA 1131 is configured to maintain an output power greater than or equal to the nominal output power, if the optical power of the optical signal received through the first optical fiber link 10a detected by the second optical communication device 12 is less than a first power threshold, it indicates a fault in this segment. In this case, regardless of whether there is a fault within the first optical communication device 11, the first OMS is faulty. When the second WSS112 and the first OA1131 are both in a state where the input service optical signal is not lost, it indicates that there is no fault in this segment within the first optical communication device 11. Simultaneously, if the optical power of the optical signal received through the first optical fiber link 10a detected by the second optical communication device 12 is greater than or equal to the first power threshold, it indicates that there is no fault in the segment between the first optical communication device 11 and the second optical communication device 12. In this case, the first OMS is fault-free.

[0098] In implementation, the status of the second WSS112 and the status of the first OA 1131 can be monitored by the first optical communication device 11 and reported to the management device 13. Here, the second WSS112 is the transmitting WSS in one dimension of the scheduling unit of the first optical communication device 11, the first OA 1131 is the transmitting OA in the same dimension of the scheduling unit of the first optical communication device 11, and the first WSS111 is the receiving WSS in another dimension of the scheduling unit of the first optical communication device 11. Therefore, the detection methods for whether the input service optical signal of the first WSS111 is lost and whether the input service optical signal of the first OA 1131 is lost can be found in the relevant content in Figure 2, and will not be repeated here.

[0099] In one possible implementation, when the second WSS 112 is in a state of input service optical signal loss, the first optical communication device 11 sends a first alarm message to the management device 13. This first alarm message notifies the management device 13 that the input service optical signal of the second WSS 112 has been lost. When the first OA 1131 is in a state of input service optical signal loss, the first optical communication device 11 sends a second alarm message to the management device 13. This second alarm message notifies the management device 13 that the input service optical signal of the first OA 1131 has been lost. In this case, when the management device 13 receives the first alarm message, it determines that the input service optical signal of the second WSS 112 has been lost based on the first alarm message. If the management device 13 does not receive the first alarm message, it assumes that the input service optical signal of the second WSS 112 has not been lost. Similarly, when the management device 13 receives the second alarm information, it determines that the input service optical signal of the first OA 1131 is lost based on the second alarm information. When the management device 13 does not receive the second alarm information, it assumes that the input service optical signal of the first OA 1131 is not lost.

[0100] In another possible implementation, the first optical communication device 11 periodically sends a first status indication message and a second status indication message to the management device 13. The first status indication message indicates whether the input service optical signal of the second WSS 112 has been lost, and the second status indication message indicates whether the input service optical signal of the first OA 1131 has been lost. For example, when the first status indication message is a first value, it indicates that the input service optical signal of the second WSS 112 has been lost; when the first status indication message is a second value, it indicates that the input service optical signal of the second WSS 112 has not been lost. When the second status indication message is a first value, it indicates that the input service optical signal of the first OA 1131 has been lost; when the second status indication message is a second value, it indicates that the input service optical signal of the first OA 1131 has not been lost. Optionally, the first value is 0 and the second value is 1; or, the first value is 1 and the second value is 0.

[0101] In another possible implementation, the first optical communication device 11 periodically sends a third status indication message to the management device 13. This third status indication message is used to simultaneously indicate the status of the second WSS 112 and the status of the first OA 1131. For example, the third status indication message includes two bits, and different values ​​of the two bits correspond to different combinations of the statuses of the second WSS 112 and the first OA 1131. For instance, 00 indicates that the input service optical signals of both the second WSS 112 and the first OA 1131 are not lost; 01 indicates that the input service optical signal of the second WSS 112 is lost but the input service optical signal of the first OA 1131 is not lost; 10 indicates that the input service optical signal of the second WSS 112 is not lost but the input service optical signal of the first OA 1131 is lost; and 11 indicates that the input service optical signals of both the second WSS 112 and the first OA 1131 are lost.

[0102] In a first possible implementation, the second optical communication device 12 generates a first indication message only when the optical power of the detected first or second optical signal is less than a first power threshold, and sends the first indication message to the management device 13; when the optical power of the detected first or second optical signal is greater than or equal to the first power threshold, it does not generate the first indication message. The management device 13 can determine that the first OMS is faulty upon receiving the first indication message. If the management device 13 does not receive the first indication message, it considers that the optical power of the first or second optical signal detected by the second optical communication device 12 is greater than the first power threshold, and that there is no fault in the segment between the first optical communication device 11 and the second optical communication device 12 in the first OMS. In this example, the first indication message is equivalent to an alarm message. By sending the first indication message to the management device 13 only when the optical power of the first or second optical signal detected by the second optical communication device 12 is less than the first power threshold, resources can be saved.

[0103] In a second possible implementation, the second optical communication device 12 can periodically send first indication information to the management device 13. When the first indication information is a third value, it indicates that the optical power of the first or second optical signal detected by the second optical communication device 12 is less than a first power threshold; when the first indication information is a fourth value, it indicates that the optical power of the first or second optical signal detected by the second optical communication device 12 is greater than or equal to the first power threshold. Optionally, the third value is 0 and the fourth value is 1; or, the third value is 1 and the fourth value is 0. The period at which the second optical communication device sends the first indication information can be set according to actual needs, and this application embodiment does not limit this. For example, the period at which the second optical communication device 12 sends the first indication information can be the same as or different from the period at which the first optical communication device 11 sends status indication information (e.g., first status indication information, second status indication information, or third status indication information).

[0104] In a third possible implementation, the second optical communication device 12 can send first indication information to the management device 13 according to the instructions of the management device 13. For example, when the management device 13 receives a first alarm message or a second alarm message, it sends a query request to the second optical communication device 12; the second optical communication device 12 sends the first indication information to the management device according to the query request. When the first indication information is a third value, it indicates that the optical power of the first or second optical signal detected by the second optical communication device 12 is less than a first power threshold; when the first indication information is a fourth value, it indicates that the optical power of the first or second optical signal detected by the second optical communication device 12 is greater than or equal to the first power threshold. Optionally, the third value is 0 and the fourth value is 1; or, the third value is 1 and the fourth value is 0.

[0105] In the second and third embodiments, the management device 13 determines whether the first OMS is faulty based on the value of the received first instruction information.

[0106] As can be seen, in this embodiment of the application, the management device 13 can obtain the information required for fault detection from the first optical communication device 11 and the second optical communication device 12. Moreover, this information is directly obtained by the first optical communication device 11 and the second optical communication device 12 without the need to collect information from other optical communication devices, thereby reducing the time spent waiting for other optical communication devices to transmit information and thus improving the fault detection efficiency of OMS.

[0107] Optionally, since the distance between the first optical communication device 11 and the second optical communication device 13 is relatively large, the optical communication system further includes at least one OLA. This at least one OLA is disposed in the first optical fiber link 10a and is used to amplify the optical power of the optical signal in the first optical fiber link 10a, so that the optical signal can be transmitted to the second optical communication device 12. The number of OLAs in the first optical fiber link 10a can be determined comprehensively based on the distance between the first optical communication device 11 and the second optical communication device 12, the capability of the OLAs, etc., and this embodiment does not impose any limitations on this.

[0108] For example, each OLA includes one OA and two FIUs. The input of one FIU is connected to an upstream optical communication device, and its output is connected to the input of the OA. The output of the OA is connected to the input of the other FIU, and the output of the other FIU is connected to a downstream optical communication device. Here, the upstream optical communication device refers to the first optical communication device in the opposite direction of the optical signal transmission direction, and the downstream optical communication device refers to the first optical communication device in the direction of the optical signal transmission direction.

[0109] For example, in the first fiber optic link 10a in Figure 3, there are two OLAs, namely OLA 14 and OLA 15.

[0110] As shown in Figure 3, OLA 14 includes two FIUs 141a and 141b and OA 142. The input terminal of FIU 141a is connected to the first optical communication device 11, the output terminal of FIU 141a is connected to the input terminal of OA 142, the output terminal of OA 142 is connected to the input terminal of FIU 141b, and the output terminal of FIU 141b is connected to OLA 15.

[0111] OLA 15 includes two FIUs 151a and 151b and OA 152. The input of FIU 151a is connected to OLA 14, the output of FIU 151a is connected to the input of OA 152, the output of OA 152 is connected to the input of FIU 151b, and the output of FIU 151b is connected to the second optical communication device 12.

[0112] In this embodiment of the application, other OAs (e.g., OA 142, 152) in the first OMS, except for the first OA 1131, can operate in AGC mode.

[0113] In this embodiment, each optical communication device is equipped with an FIU, and each FIU corresponds to an optical supervisory channel (OSC) unit to facilitate further fault location. For example, it determines which fiber segment between two adjacent optical communication devices the fault originates. For instance, in OLA 14, the monitoring signal provided by OSC4 is combined with the service optical signal output from OA 142 via FIU 141b and sent to OLA 15 via a long fiber; in OLA 15, FIU 151a separates the monitoring signal and sends it to OSC5. If the fiber segment between OLA 14 and OLA 15 is faulty, OSC5 will not receive the monitoring signal. If the fiber segment between OLA 14 and OLA 15 is not faulty, OSC5 can receive the monitoring signal normally. Therefore, OSC5 can determine whether the fiber segment between OLA 14 and OLA 15 is faulty based on the received optical signal. If monitoring faults in fiber segments between adjacent optical communication devices is not required, an OSC unit is not necessary.

[0114] In related technologies, if a certain FIU of an intermediate optical communication device between the first and second optical communication devices detects a loss of monitoring signal or a loss of input service optical signal of an optical device, an alarm message will be generated. To save network costs, the intermediate optical communication device and the management device 13 typically cannot communicate directly. Therefore, the intermediate optical communication device cannot directly report the alarm message to the management device 13, resulting in a longer time for the management device 13 to collect the alarm message. However, in this embodiment, the first indication information is generated by the second optical communication device 12, and the status of the second WSS 112 and the first OA 1131 is detected by the first optical communication device 11. Therefore, the corresponding information can be directly sent to the management device 13, effectively saving the time for the management device 13 to obtain the alarm message.

[0115] Suppose that an alarm is generated due to the loss of the input service optical signal of OA 152 in OLA 15 in Figure 3. This alarm may be caused by a fault in OA 152. However, due to the problem of fault pass-through between OMSs, the cause of this alarm could also be a fault in OA 142 in OLA 14, a fault in the second WSS 112 of the first optical communication device 11, or even a fault in the optical communication device in the upstream OMS of the second WSS 112. Therefore, even if this type of alarm is reported to the management device 13 in a timely manner, the management device 13 cannot quickly determine whether the first OMS is faulty.

[0116] In this embodiment, regardless of whether the output end of the second WSS outputs a service optical signal, the optical power of the optical signal sent by the first output unit to the second optical communication device through the first optical fiber link is greater than or equal to the nominal output power of the single-wavelength optical signal. Therefore, if the second optical communication device detects that the optical power of the first or second optical signal is too low, it indicates that the first OMS is faulty. There is no need to collect alarm information from various optical communication devices related to the first OMS before determining whether the first OMS is faulty; the fault can be detected quickly when the first OMS is faulty, improving the fault detection speed of the first OMS. Furthermore, the first relationship between the detected optical power of the first or second optical signal and the first power threshold can directly reflect whether the first OMS is faulty, simplifying the judgment logic for whether the first OMS is faulty and improving the efficiency of determining whether the first OMS is faulty.

[0117] Furthermore, in this embodiment, by configuring the first OA, the optical power of the optical signal output by the first optical communication device on the first optical fiber link is always greater than or equal to the nominal output power of the single-wavelength optical signal. This requires no changes to the existing structure of the first optical communication device, making the implementation simple.

[0118] Figure 5 is a schematic diagram of another optical communication system provided in an embodiment of this application. As shown in Figure 5, the difference between this optical communication system and the optical communication system shown in Figure 3 lies in the different structure of the first output unit 113.

[0119] As shown in Figure 5, the first optical communication device 11 includes a first WSS 111, a second WSS 112, and a first output unit 113. The output terminal of the first WSS 111 is used to output service optical signals. The input terminal of the second WSS 112 is connected to the output terminal of the first WSS 111 and is used to receive the service optical signals output by the output terminal of the first WSS 111.

[0120] The first output unit 113 includes a first OA 1131 and a light source 1130. The input terminal of the first OA 1131 is connected to the output terminal of the second WSS 112. The output terminal of the first OA 1131 is connected to one end of the first optical fiber link 10a. The light source 1130 is connected to the input terminal of the second WSS 112 and is used to provide a detection optical signal to the input terminal of the second WSS 112 so that the output optical power of the first OA 1131 is greater than or equal to the nominal output power.

[0121] In this embodiment, by adding a light source to the first optical communication device 11 to provide a detection optical signal, and the detection optical signal is directly provided to the second WSS 112, it can be ensured that the minimum optical power output by the second WSS 112 to the first OA 1131 is the optical power of the detection optical signal. The detection optical signal is used to ensure that the output power of the first OA 1131 is always greater than or equal to the nominal output power.

[0122] To avoid interference with the service optical signal, the detection optical signal is an out-of-band optical signal. That is, the wavelength of the detection optical signal is outside the band where the service optical signal is located. For example, assuming the service optical signal is located in the C band, the wavelength of the detection optical signal is outside the C band; or, assuming the service optical signal is located in both the C and L bands, the wavelength of the detection optical signal is outside both the C and L bands.

[0123] In one possible implementation, the optical power of the detection optical signal is a fixed value, meaning that the light source 1130 outputs the detection optical signal with a fixed output optical power. This fixed value can be determined based on the gain and nominal output power of the first OA 1131. For example, after the detection optical signal is amplified by the first OA 1131, the sum of the fixed value and the gain of the first OA 1131 equals the nominal output power.

[0124] In another possible implementation, the optical power of the detection optical signal is variable. The optical power of the detection optical signal can be adjusted according to the current gain value of the first OA 1131, so that after the detection optical signal is amplified by the first OA 1131, the output optical power is equal to the nominal output power.

[0125] The embodiments of this application do not limit the type of the light source 1130, such as a laser.

[0126] In this embodiment, the management device 13 is used to determine whether the first OMS is faulty in the following manner: when the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than a first power threshold, or when the state of the second WSS112 is that the input service signal is lost, the first OMS is determined to be faulty. When the first indication information indicates that the optical power of the detected first optical signal or second optical signal is greater than or equal to the first power threshold, and the state of the second WSS112 is that the input service signal is not lost, the first OMS is determined not to be faulty.

[0127] In this embodiment, since the detection optical signal is directly provided to the second WSS112 and the transmission path of the detection optical signal is from the second WSS112 to the second optical communication device 12, the first indication information can reflect whether the part of the first OMS located between the second WSS112 and the second optical communication device 12 is faulty. The first OA 1131 is located in this part, so there is no need to detect the status of the first OA 1131 separately. This further reduces the information that the management device 13 depends on to determine whether the first OMS is faulty, simplifies the judgment logic, and helps to further improve the efficiency of determining whether the first OMS is faulty.

[0128] Figure 6 is a schematic diagram of another optical communication system provided in an embodiment of this application. As shown in Figure 6, the difference from the optical communication system shown in Figure 4 is that in this optical communication system, the first optical communication device 11 and the second optical communication device 12 are simultaneously connected via a first optical fiber link 10a and a second optical fiber link 10b. Details regarding the first optical fiber link 10a can be found in the foregoing embodiments, and are omitted here in detail. The second optical fiber link 10b includes at least an optical fiber and a connector. In some examples, the second optical fiber link 10b may also include multiple other optical communication devices located between the first and second optical communication devices, such as optical line amplifiers (OLAs).

[0129] In this embodiment, the segment starting from the input of the second WSS112, passing through the second optical fiber link 10b, and ending at the output of the receiving WSS in the second optical communication device 12 connected to the first optical fiber link 10a is called the second OMS. This second OMS can serve as a backup OMS for the first OMS; in the event of a failure of the first OMS, the system can preferentially switch to the second OMS for optical signal transmission. If both the first and second OMS fail, rerouting is then performed.

[0130] In practice, the second optical fiber link 10b can have the same structure as the first optical fiber link 10a, for example, both include two OLAs, so that the transmission performance of the first optical fiber link 10a and the second optical fiber link 10b is comparable.

[0131] As shown in Figure 6, the first optical communication device 11 includes a first WSS 111, a second WSS 112, a first output unit 113, a first optical switch 114, and a second output unit 115. The output terminal of the first WSS 111 is used to output service optical signals. The input terminal of the second WSS 112 is connected to the output terminal of the first WSS 111 and is used to receive the service optical signals output by the output terminal of the first WSS 111. The input terminal of the first optical switch 114 is connected to the output terminal of the second WSS 112, one output terminal of the first optical switch 114 is connected to the input terminal of the first output unit 113, and the other output terminal of the first optical switch 114 is connected to the input terminal of the second output unit 115.

[0132] The second output unit 115 is used to output a third optical signal, including the service optical signal, through the second optical fiber link 10b when a service optical signal is output at the output end of the second WSS112; or, when no service optical signal is output at the output end of the second WSS112, to output a fourth optical signal through the second optical fiber link 10b, the optical power of the fourth optical signal being greater than or equal to the nominal output power of the single-wavelength optical signal. The second optical communication device 12 is also used to receive the third or fourth optical signal through the second optical fiber link 10b, and to detect the optical power of the received third or fourth optical signal.

[0133] In some embodiments, the third optical signal is the same as the first optical signal, but is transmitted through a different optical fiber link; the second optical signal is the same as the fourth optical signal, but is transmitted through a different optical fiber link.

[0134] The first output unit 113 includes a first OA 1131. The second output unit 115 includes a second OA 1151. The input terminal of the first optical switch 114 is connected to the output terminal of the second WSS 112, one output terminal of the first optical switch 114 is connected to the input terminal of the first OA 1131, the other output terminal of the first optical switch 114 is connected to the input terminal of the second OA 1151, and the output terminal of the second OA 1151 is connected to the second optical fiber link 10b.

[0135] In this embodiment, the second OA 1151 is configured to maintain an output power greater than or equal to the nominal output power, as described in the configuration of the first OA. In other embodiments, the second output unit 115 can provide a detection optical signal to the input of the second WSS via a light source, so that the output power of the second OA is greater than or equal to the nominal output power. Optionally, the second output unit can share a light source with the first output unit to simplify the device structure and save costs. Alternatively, the second output unit and the first output unit can each use a separate light source to improve the reliability of the detection optical signal.

[0136] Optionally, the second optical communication device 12 is further configured to generate second indication information based on the optical power of the detected third or fourth optical signal. This second indication information indicates a second relationship between the optical power of the detected third or fourth optical signal and a second power threshold. The second relationship reflects whether a fault exists in the second OMS. The second power threshold is less than the nominal output power.

[0137] Optionally, the second power threshold may be equal to or unequal to the first power threshold. Specifically, it can be set according to the transmission performance of the first OMS and the second OMS. If the transmission performance of the first OMS and the second OMS is comparable, then the second power threshold may be equal to the first power threshold.

[0138] The second optical communication device 12 includes a second optical switch 124 and a third WSS 121. The second optical switch 124 includes a first channel and a second channel. The outputs of both the first and second channels are connected to the second WSS 121, the input of the first channel is connected to the first optical fiber link 10a, and the input of the second channel is connected to the second optical fiber link 10b. When the first OMS fails, the first optical communication device 11 controls the first optical switch 114 to connect the second WSS 112 to the second OA 1151, and the second optical communication device 12 controls the second optical switch 124 to connect the second channel, thus enabling a switch from the first OMS to the second OMS. Switching from the first OMS to the second OMS can be achieved by controlling both the first and second optical switches, resulting in high switching efficiency.

[0139] Optionally, the second optical communication device 12 further includes a third OA 122 and a fourth OA 123. The input of the third OA 122 is connected to the other end of the first optical fiber link 10a, and the output of the third OA 122 is connected to the input of the first channel of the second optical switch 124. That is, the input of the first channel of the second optical switch 124 is connected to the first optical fiber link 10a via the third OA 122. The input of the fourth OA 123 is connected to the other end of the second optical fiber link 10b, and the output of the fourth OA 123 is connected to the input of the second channel of the second optical switch 124. That is, the input of the second channel of the second optical switch 124 is connected to the second optical fiber link 10b via the fourth OA 123.

[0140] In this embodiment, the management device 13 is further configured to instruct the first optical communication device 11 to send an optical signal to the second optical communication device 12 via the second optical fiber link 10b, and to instruct the second optical communication device 12 to receive an optical signal via the second optical fiber link 10b. For example, when the first OMS fails, the management device 13 is configured to instruct the first optical communication device 11 to send an optical signal to the second optical communication device 12 via the second optical fiber link 10b and to instruct the second optical communication device 12 to receive an optical signal via the second optical fiber link 10b.

[0141] The management device 13 is configured to, when the state of the second WSS112 is that the input service optical signal has not been lost, the state of the second OA 1151 is that the input service optical signal has not been lost, and the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than the first power threshold, instruct the first optical communication device 11 to send an optical signal to the second optical communication device 12 through the second optical fiber link 10b, and instruct the second optical communication device 12 to receive an optical signal through the second optical fiber link 10b.

[0142] Before switching to transmit optical signals via the second fiber optic link 10b, the states of the second WSS 112 and the second OA 1151 are determined. If the state of the second WSS 112 is that the input service optical signal has not been lost and the state of the second OA 1151 is that the input service optical signal has not been lost, then the transmission of optical signals is switched to the second fiber optic link 10b. This can reduce the possibility of discovering a fault in the second OMS where the second fiber optic link 10b is located after the switch, and further improve the transmission performance of the optical communication system.

[0143] Optionally, the management device 13 is also used to reroute the optical signal carried by the first OMS in the event that both the first OMS and the second OMS fail.

[0144] Figure 7 is a schematic flowchart of a fault detection method provided in an embodiment of this application. This fault detection method can be executed by a second optical communication device in the aforementioned optical communication system. As shown in Figure 7, the method includes the following steps.

[0145] In 701, the optical power of the first optical signal or the second optical signal received through the first optical fiber link is detected;

[0146] In 702, a first indication message is generated based on the optical power of the detected first or second optical signal.

[0147] The first indication information is used to indicate a first relationship between the optical power of the detected first or second optical signal and a first power threshold. This first relationship reflects whether there is a fault in the first OMS where the first optical fiber link is located. The first power threshold is less than the nominal output power.

[0148] When this method is applied to the optical communication system shown in Figure 3 or Figure 5, S701 includes: determining whether the first OMS is faulty based on at least one of the state of the second WSS, the state of the first OA, and the first indication information. The state of the second WSS refers to whether the input service optical signal of the second WSS is lost, and the state of the first OA refers to whether the input service optical signal of the first OA is lost.

[0149] Optionally, determining whether the first OMS is faulty based on at least one of the states of the second WSS, the first OA, and the first indication information includes: determining that the first OMS is faulty when the state of the second WSS is that the input service optical signal is lost or the state of the first OA is that the input service optical signal is lost; or determining that the first OMS is faulty when the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than a first power threshold.

[0150] Optionally, when the method is applied to the optical communication system shown in Figure 6, the method further includes:

[0151] In 703, the optical power of the third or fourth optical signal received through the second optical fiber link is detected;

[0152] In step 704, a second indication is generated based on the optical power of the detected third or fourth optical signal.

[0153] The second indication information is used to indicate a second relationship between the optical power of the detected third or fourth optical signal and a second power threshold. The second relationship is used to reflect whether there is a fault in the second OMS, wherein the second power threshold is less than the nominal output power.

[0154] Figure 8 is a schematic flowchart of a fault detection method provided in an embodiment of this application. This fault detection method can be executed by a management device in the aforementioned optical communication system. As shown in Figure 8, the method includes the following steps.

[0155] In step 801, the first instruction information sent by the second optical communication device is received.

[0156] The first indication information is used to indicate a first relationship between the optical power of the first or second optical signal detected by the second optical communication device and a first power threshold. The first and second optical signals pass through a first optical fiber link. The first relationship is used to reflect whether there is a fault in the first OMS where the first optical fiber link is located, and the first power threshold is less than the nominal output power.

[0157] In step 802, based on the first indication information, it is determined whether the first OMS is faulty.

[0158] Optionally, determining whether the first OMS is faulty based on the first indication information includes: determining whether the first OMS is faulty based on at least one of the status of the second WSS, the status of the first OA, and the first indication information. Wherein, the status of the second WSS refers to whether the input service optical signal of the second WSS is lost, and the status of the first OA refers to whether the input service optical signal of the first OA is lost.

[0159] In some examples, when the state of the second WSS is that the input service optical signal is lost or the state of the first OA is that the input service optical signal is lost, it is determined that the first OMS is faulty; or, when the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than the first power threshold, it is determined that the first OMS is faulty.

[0160] In other examples, when the state of the second WSS is that the input service optical signal is lost, the state of the first OA is that the input service optical signal is lost, and the first indication information indicates that the optical power of the detected first optical signal or second optical signal is greater than or equal to the first power threshold, it is determined that the first OMS is not faulty.

[0161] Optionally, the first optical communication device and the second optical communication device are also connected via a second optical fiber link. That is, when this method is applied to the optical communication system shown in Figure 6, the method further includes:

[0162] In 803, the first optical communication device is instructed to send an optical signal to the second optical communication device through the second optical fiber link, and the second optical communication device is instructed to receive an optical signal through the second optical fiber link.

[0163] Optionally, 803 includes: when the state of the second WSS is that the input service optical signal has not been lost, the state of the second OA is that the input service optical signal has not been lost, and the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than the first power threshold, instructing the first optical communication device to send an optical signal to the second optical communication device through the second optical fiber link, and instructing the second optical communication device to receive the optical signal through the second optical fiber link.

[0164] In step 804, the second instruction information sent by the second optical communication device is received.

[0165] The second indication information is used to indicate a second relationship between the optical power of the third or fourth optical signal detected by the second optical communication device and the second power threshold. The third and fourth optical signals are transmitted through the second optical fiber link. The second relationship is used to reflect whether there is a fault in the second OMS where the second optical fiber link is located. The second power threshold is less than the nominal output power.

[0166] In step 805, the presence of a fault in the second OMS is determined based on the second indication information.

[0167] The method for determining whether the second OMS is faulty based on the second indication information is the same as the method for determining whether the first OMS is faulty based on the first indication information, and will not be described further here.

[0168] Figure 9 is a schematic diagram of a fault detection device provided in an embodiment of this application. This fault detection device can be implemented as part of a second optical communication device through hardware, software, or a combination of both. As shown in Figure 9, the fault detection device 900 includes a detection module 901 and a generation module 902. The detection module 901 is used to detect the optical power of a first optical signal or a second optical signal received through a first optical fiber link; the generation module 902 is used to generate first indication information based on the detected optical power of the first optical signal or the second optical signal. The first indication information indicates a first relationship between the detected optical power of the first optical signal or the second optical signal and a first power threshold. The first relationship reflects whether a fault exists in the first optical multiplexing section where the first optical fiber link is located, and the first power threshold is less than the nominal output power.

[0169] Optionally, the first optical communication device and the second optical communication device are also connected via a second optical fiber link. The detection module 901 is further configured to detect the optical power of a third or fourth optical signal received via the second optical fiber link, and the generation module 902 is further configured to generate second indication information based on the detected optical power of the third or fourth optical signal. The second indication information indicates a second relationship between the detected optical power of the third or fourth optical signal and a second power threshold. This second relationship reflects whether a fault exists in the second OMS where the second optical fiber link is located, and the second power threshold is less than the nominal output power.

[0170] Figure 10 is a schematic diagram of a fault detection device provided in an embodiment of this application. This fault detection device can be implemented as all or part of a management device through hardware, software, or a combination of both. As shown in Figure 10, the fault detection device 1000 includes a receiving module 1001 and a determining module 1002. The receiving module 1001 is used to receive first indication information sent by a second optical communication device. The first indication information indicates a first relationship between the optical power of a first optical signal or a second optical signal detected by the second optical communication device and a first power threshold. The first optical signal and the second optical signal are transmitted through a first optical fiber link. The first relationship reflects whether a fault exists in the first OMS where the first optical fiber link is located. The first power threshold is less than the nominal output power. The determining module 1002 is used to determine whether a fault exists in the first OMS based on the first indication information.

[0171] Optionally, the determining module 1002 is used to determine that the first OMS is faulty when the first indication information indicates that the optical power of the first optical signal or the second optical signal detected by the second optical communication device is less than the first power threshold.

[0172] Optionally, the first optical communication device and the second optical communication device are further connected via a second optical fiber link. The fault detection device also includes an indication module 1003. The indication module 1003 is used to instruct the first optical communication device to send an optical signal to the second optical communication device via the second optical fiber link and to instruct the second optical communication device to receive an optical signal via the second optical fiber link. The receiving module 1001 is further used to receive second indication information sent by the second optical communication device. The second indication information indicates a second relationship between the optical power of a third or fourth optical signal detected by the second optical communication device and a second power threshold. The third and fourth optical signals are transmitted via the second optical fiber link, and the second relationship reflects whether a fault exists in the second OMS where the second optical fiber link is located. The determining module 1002 is further used to determine whether a fault exists in the second OMS based on the second indication information.

[0173] Optionally, the indication module 1003 is configured to, when the state of the second WSS is that the input service optical signal has not been lost, the state of the second OA is that the input service optical signal has not been lost, and the first indication information indicates that the optical power of the detected first optical signal or second optical signal is less than the first power threshold, instruct the first optical communication device to send an optical signal to the second optical communication device through the second optical fiber link, and instruct the second optical communication device to receive an optical signal through the second optical fiber link.

[0174] The module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods are possible. Furthermore, the functional modules in each embodiment of this application can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0175] It should be noted that the fault detection device provided in the above embodiments, when detecting whether the first OMS is faulty, is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the fault detection device, fault detection method, and optical communication system embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method and system embodiments, which will not be repeated here.

[0176] Figure 11 is a schematic diagram of another fault detection device for OMS provided in an embodiment of this application. This fault detection device is a computer device. Figure 11 provides an exemplary possible architecture diagram of the computer device 1100.

[0177] As shown in Figure 11, the computer device 1100 includes a memory 1101, a processor 1102, a communication port 1103, and a bus 1104. The memory 1101, processor 1102, and communication port 1103 are interconnected via the bus 1104.

[0178] The memory 1101 can be a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 1101 can store programs, and when the program stored in the memory 1101 is executed by the processor 1102, the processor 1102 and the communication port 1103 are used to execute a fault detection method. The memory 1101 can also store data sets.

[0179] The processor 1102 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), a graphics processing unit (GPU), or one or more integrated circuits.

[0180] The processor 1102 can also be an integrated circuit chip with signal processing capabilities. In implementation, some or all functions of the device for identifying vehicle operation behavior in this application can be accomplished through integrated logic circuits in the hardware of the processor 1102 or through software instructions. The processor 1102 described above can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods disclosed in the above embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 1101. Processor 1102 reads the information in memory 1101 and, in conjunction with its hardware, completes part of the functions of the fault detection device in this application embodiment.

[0181] Communication port 1103 uses a transceiver module, such as, but not limited to, a transceiver, to enable communication between computer device 1100 and other devices or communication networks. For example, network characteristics can be obtained through communication port 1103.

[0182] Bus 1104 may include a pathway for transmitting information between various components of computer device 1100 (e.g., memory 1101, processor 1102, communication port 1103).

[0183] In this embodiment of the application, a computer-readable storage medium is also provided, which stores computer instructions. When the computer instructions stored in the computer-readable storage medium are executed by a computer device, the computer device performs the fault detection method provided above.

[0184] In this embodiment of the application, a computer program product containing instructions is also provided, which, when run on a computer device, causes the computer device to execute the fault detection method provided above.

[0185] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a server or terminal, they generate all or part of the processes or functions described in the embodiments of this application. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic cable, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to the server or terminal, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, and magnetic tape), an optical medium (e.g., digital video disk (DVD), etc.), or a semiconductor medium (e.g., solid-state drive, etc.).

[0186] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The “multiple” mentioned in the embodiments of this application refers to two or more. A and / or B indicate three possibilities: A; B; and A and B.

[0187] The above is merely one embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical communication system, characterized in that, include: A first optical communication device and a second optical communication device are connected by a first optical fiber link. The first optical communication device includes a first wavelength selection switch, a second wavelength selection switch, and a first output unit. The output of the first wavelength selection switch is used to output service optical signals; The input terminal of the second wavelength selection switch is connected to the output terminal of the first wavelength selection switch and is used to receive the service optical signal; The first output unit is connected to the output terminal of the second wavelength selection switch. The first output unit is used to output a first optical signal through the first optical fiber link when the service optical signal is output at the output terminal of the second wavelength selection switch, and the first optical signal includes the service optical signal; or, when the service optical signal is not output at the output terminal of the second wavelength selection switch, the first output unit is used to output a second optical signal through the first optical fiber link, and the optical power of the second optical signal is greater than or equal to the nominal output power of the single-wavelength optical signal. The second optical communication device is used to receive the first optical signal or the second optical signal through the first optical fiber link, and to detect the optical power of the received first optical signal or the second optical signal.

2. The optical communication system according to claim 1, characterized in that, The first output unit includes a first optical amplifier, the input terminal of which is connected to the output terminal of the second wavelength selection switch, and the output terminal of the first optical amplifier is connected to the first optical fiber link. The first optical amplifier is configured to maintain an output power greater than or equal to the nominal output power.

3. The optical communication system according to claim 2, characterized in that, The first optical amplifier is configured to adjust the pump power of the first optical amplifier when the output power of the first optical amplifier is less than the nominal output power, so that the output power of the first optical amplifier is greater than or equal to the nominal output power.

4. The optical communication system according to claim 1, characterized in that, The first output unit includes a first optical amplifier and a light source. The input terminal of the first optical amplifier is connected to the output terminal of the second wavelength selection switch, and the output terminal of the first optical amplifier is connected to the first optical fiber link; The light source is connected to the input terminal of the second wavelength selection switch to provide a detection light signal to the input terminal of the second wavelength selection switch, so that the output power of the first optical amplifier is greater than or equal to the nominal output power.

5. The optical communication system according to any one of claims 1 to 4, characterized in that, The second optical communication device is further configured to generate first indication information based on the detected optical power of the first optical signal or the second optical signal. The first indication information is used to indicate a first relationship between the detected optical power of the first optical signal or the second optical signal and a first power threshold. The first relationship is used to reflect whether there is a fault in the first optical multiplexing section where the first optical fiber link is located. The first power threshold is less than the nominal output power.

6. The optical communication system according to claim 5, characterized in that, The optical communication system further includes a management device, which is used to determine whether there is a fault in the first optical multiplex segment where the first optical fiber link is located, based on the first indication information.

7. The optical communication system according to claim 6, characterized in that, The management device is used to determine that the first optical multiplexing segment is faulty when the first indication information indicates that the optical power of the detected first optical signal or the second optical signal is less than the first power threshold.

8. The optical communication system according to claim 6 or 7, characterized in that, The first optical communication device and the second optical communication device are also connected via a second optical fiber link. The first optical communication device further includes a first optical switch and a second output unit. The input terminal of the first optical switch is connected to the output terminal of the second wavelength selection switch. One output terminal of the first optical switch is connected to the first output unit, and the other output terminal of the first optical switch is connected to the second output unit. The second output unit is configured to output a third optical signal via the second optical fiber link when the service optical signal is output at the output terminal of the second wavelength selection switch, the third optical signal including the service optical signal; or, when the service optical signal is not output at the output terminal of the second wavelength selection switch, it is configured to output a fourth optical signal via the second optical fiber link, the optical power of the fourth optical signal being greater than or equal to the nominal output power of the single-wavelength optical signal. The second optical communication device is also used to receive the third optical signal or the fourth optical signal through the second optical fiber link, and to detect the optical power of the received third optical signal or the fourth optical signal.

9. The optical communication system according to claim 8, characterized in that, The second optical communication device is further configured to generate second indication information based on the detected optical power of the third optical signal or the fourth optical signal. The second indication information is used to indicate a second relationship between the detected optical power of the third optical signal or the fourth optical signal and a second power threshold. The second relationship is used to reflect whether there is a fault in the second optical multiplexing section where the second optical fiber link is located. The second power threshold is less than the nominal output power.

10. The optical communication system according to claim 8 or 9, characterized in that, The second output unit includes a second optical amplifier, and the output end of the second optical amplifier is connected to the second optical fiber link; The management device is further configured to, when the state of the second wavelength selection switch is that the input service optical signal has not been lost, the state of the second optical amplifier is that the input service optical signal has not been lost, and the optical power of the first optical signal or the second optical signal detected by the first indication information is less than the first power threshold, instruct the first optical communication device to send an optical signal to the second optical communication device through the second optical fiber link, and instruct the second optical communication device to receive an optical signal through the second optical fiber link.

11. An optical communication device, characterized in that, include: The system comprises a first wavelength selection switch, a second wavelength selection switch, and a first output unit. The output of the first wavelength selection switch is used to output service optical signals; The input terminal of the second wavelength selection switch is connected to the output terminal of the first wavelength selection switch and is used to receive the service optical signal; The first output unit is connected to the output terminal of the second wavelength selection switch. The first output unit is used to output a first optical signal through the first optical fiber link when the service optical signal is output at the output terminal of the second wavelength selection switch, and the first optical signal includes the service optical signal; or, when the service optical signal is not output at the output terminal of the second wavelength selection switch, the first output unit is used to output a second optical signal through the first optical fiber link, and the optical power of the second optical signal is greater than or equal to the nominal output power of the single-wavelength optical signal.

12. The optical communication device according to claim 11, characterized in that, The first output unit includes a first optical amplifier, the input terminal of which is connected to the output terminal of the second wavelength selection switch, and the output terminal of the first optical amplifier is connected to the first optical fiber link. The first optical amplifier is configured to maintain an output power greater than or equal to the nominal output power.

13. The optical communication device according to claim 12, characterized in that, The first optical amplifier is configured to adjust the pump power of the first optical amplifier when the output power of the first optical amplifier is less than the nominal output power, so that the output power of the first optical amplifier is greater than or equal to the nominal output power.

14. The optical communication device according to claim 11, characterized in that, The first output unit includes a first optical amplifier and a light source. The input terminal of the first optical amplifier is connected to the output terminal of the second wavelength selection switch, and the output terminal of the first optical amplifier is connected to the first optical fiber link; The light source is connected to the input terminal of the second wavelength selection switch to provide a detection light signal to the input terminal of the second wavelength selection switch, so that the output power of the first optical amplifier is greater than or equal to the nominal output power.

15. The optical communication device according to any one of claims 11 to 14, characterized in that, The optical communication device further includes a first optical switch and a second output unit. The input terminal of the first optical switch is connected to the output terminal of the second wavelength selection switch. One output terminal of the first optical switch is connected to the first output unit, and the other output terminal of the first optical switch is connected to the second output unit. The second output unit is configured to output a third optical signal via a second optical fiber link when the service optical signal is output at the output terminal of the second wavelength selection switch, the third optical signal including the service optical signal; or, when the service optical signal is not output at the output terminal of the second wavelength selection switch, it is configured to output a fourth optical signal via the second optical fiber link, the optical power of the fourth optical signal being greater than or equal to the nominal output power of the single-wavelength optical signal.

16. A fault detection method, characterized in that, The method is applied to the optical communication system as described in any one of claims 1 to 10; The fault detection method includes: Detect the optical power of the first or second optical signal received through the first optical fiber link; Based on the detected optical power of the first optical signal or the second optical signal, a first indication information is generated. The first indication information is used to indicate a first relationship between the detected optical power of the first optical signal or the second optical signal and a first power threshold. The first relationship is used to reflect whether there is a fault in the first optical multiplexing section where the first optical fiber link is located. The first power threshold is less than the nominal output power.

17. A fault detection device, characterized in that, The device is applied to the optical communication system as described in any one of claims 1 to 10, and is used to detect whether there is a fault in the first optical multiplex segment where the first optical fiber link is located; The fault detection device includes: The detection module is used to detect the optical power of the first optical signal or the second optical signal received through the first optical fiber link; The generation module is used to generate first indication information based on the detected optical power of the first optical signal or the second optical signal. The first indication information is used to indicate a first relationship between the detected optical power of the first optical signal or the second optical signal and a first power threshold. The first relationship is used to reflect whether there is a fault in the first optical multiplexing section where the first optical fiber link is located. The first power threshold is less than the nominal output power.

18. A fault detection method, characterized in that, The method is applied to the optical communication system as described in any one of claims 1 to 10; The fault detection method includes: The device receives first indication information sent by a second optical communication device. The first indication information is used to indicate a first relationship between the optical power of a first optical signal or a second optical signal detected by the second optical communication device and a first power threshold. The first optical signal and the second optical signal are transmitted through a first optical fiber link. The first relationship is used to reflect whether there is a fault in the first optical multiplexing section where the first optical fiber link is located. The first power threshold is less than the nominal output power. Determine whether the first optical multiplexer segment is faulty based on the first indication information.

19. The method according to claim 18, characterized in that, Determining whether the first optical multiplexer segment is faulty based on the first indication information includes: When the first indication information indicates that the optical power of the first optical signal or the second optical signal detected by the second optical communication device is less than the first power threshold, it is determined that there is a fault in the first optical multiplexing section.

20. A fault detection device, characterized in that, The device is applied to the optical communication system as described in any one of claims 1 to 10; The fault detection device includes: The receiving module is configured to receive first indication information sent by the second optical communication device. The first indication information is configured to indicate a first relationship between the optical power of the first optical signal or the second optical signal detected by the second optical communication device and a first power threshold. The first optical signal and the second optical signal are transmitted through a first optical fiber link. The first relationship is configured to reflect whether there is a fault in the first optical multiplexing section where the first optical fiber link is located. The first power threshold is less than the nominal output power. The determination module is used to determine whether there is a fault in the first optical multiplexer section based on the first indication information.

21. The apparatus according to claim 20, characterized in that, The determining module is used to determine that the first optical multiplexing segment has a fault when the first indication information indicates that the optical power of the first optical signal or the second optical signal detected by the second optical communication device is less than the first power threshold.

22. A fault detection device, characterized in that, It includes a processor and a memory; the memory is used to store software programs, and the processor implements the method of claim 16 or the method of claim 18 or 19 by running or executing the software programs stored in the memory.

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