A control method, related device and system for optical signal transmission

Abstract

The embodiment of the present application discloses a kind of control method of optical signal transmission, related equipment and system.It is used to accurately and timely realize protection switching.The method comprises the following steps: first, optical signal is received by electric relay equipment.Second, the electric relay equipment determines that the optical signal fails or appears quality degradation.Third, the electric relay equipment turns off the laser corresponding to the optical signal.The scheme disclosed in the present application can trigger protection switching whether the optical signal fails or appears quality degradation, thereby effectively avoiding the situation of protection switching failure.

Description

Technical Field

[0001] This application relates to the field of optical communication, and in particular to a control method, related equipment and system for optical signal transmission. Background Technology

[0002] An optical communication system includes optical transmitting equipment and optical receiving equipment. To ensure the security of optical signal transmission, a primary transmission path and a backup transmission path are connected between the optical transmitting equipment and the optical receiving equipment. The primary and backup transmission paths transmit optical signals carrying the same service. If the optical receiving equipment determines that the primary transmission path has failed, it performs protection switching to obtain the optical signal transmitted from the backup transmission path.

[0003] As the transmission distance between optical transmitting and receiving equipment increases, it is necessary to ensure transmission performance even with this increased distance. Therefore, electrical repeaters are connected to the primary and backup transmission paths. These repeaters are used to perform signal regeneration and power amplification on the optical signals from the transmitting equipment.

[0004] The primary transmission path fails, but the optical signal is regenerated by the electrical repeater, causing the repeater to continue sending the regenerated optical signal to the optical receiver. The optical receiver, by only detecting the regenerated optical signal, cannot perform protection switching. Summary of the Invention

[0005] This embodiment provides a control method, related equipment, and system for optical signal transmission. It is used to accurately and timely implement protection switching.

[0006] A first aspect of this invention provides a control method for optical signal transmission. The method includes: first, an electrical repeater receiving an optical signal; second, the electrical repeater determining that the optical signal has malfunctioned or experienced quality degradation; and third, the electrical repeater shutting off the laser corresponding to the optical signal. Based on this aspect, regardless of whether the optical signal malfunctions or experiences quality degradation, protection switching can be triggered, effectively avoiding protection switching failures.

[0007] Based on the first aspect, in one optional implementation, the electrical repeater determining that the optical signal has experienced quality degradation includes: the electrical repeater determining that the optical power of the optical signal is less than or equal to a first threshold value. Based on this implementation, protection switching is achieved when the optical power of the optical signal degrades.

[0008] Based on the first aspect, in one optional implementation, the electrical repeater determining that the optical signal has experienced quality degradation includes: the electrical repeater determining that the optical signal-to-noise ratio (OSNR) of the optical signal is greater than or equal to a second threshold value. Based on this implementation, protection switching is implemented when the OSNR of the optical signal deteriorates.

[0009] Based on the first aspect, in one optional implementation, the electrical repeater determining that the optical signal has experienced quality degradation includes: the electrical repeater determining that the bit error rate of the electrical signal corresponding to the optical signal is greater than or equal to a third threshold value. Based on this implementation, protection switching is achieved when the bit error rate of the electrical signal after photoelectric conversion of the optical signal deteriorates.

[0010] Based on the first aspect, in one optional implementation, the electrical repeater determines that the optical signal has experienced quality degradation by: the electrical repeater determines that within a time window, the number of bit errors in the electrical signal corresponding to the optical signal is greater than or equal to a fourth threshold value. Based on this implementation, protection switching is achieved when the electrical signal after photoelectric conversion of the optical signal experiences bit error degradation.

[0011] Based on the first aspect, in one optional implementation, the electrical repeater determines that the optical signal has deteriorated in quality by: first, performing forward error correction (FEC) on the electrical signal corresponding to the optical signal to obtain the forward error correction code rate; second, determining that the forward error correction code rate is greater than or equal to a fifth threshold value. Based on this implementation, protection switching is achieved when the forward error correction code rate of the electrical signal after photoelectric conversion of the optical signal deteriorates.

[0012] Based on the first aspect, in one optional implementation, the optical signal is determined to be faulty when the electrical repeater determines that the optical signal is in at least one of the following states:

[0013] Signal loss (LOS), frame loss alarm, multiframe loss alarm, alarm indication signal AIS, disconnection indication OCI, lockout indication LCK, or trace word mismatch alarm with segment inspection overhead (SM).

[0014] Based on the first aspect, in an optional implementation, after the electrical repeater determines that the optical signal has failed or experienced quality degradation, the method further includes: the electrical repeater sending a fault indication message to the network management device. The fault indication message is used to indicate that the optical signal has failed or experienced quality degradation. Based on this implementation, the network management device can improve the efficiency and accuracy of maintenance personnel in troubleshooting transmission path failures based on the fault indication message.

[0015] A second aspect of this invention provides a control method for optical signal transmission. The method is applied to an optical communication system. The optical communication system includes a first optical communication device, a first electrical relay device, and a second optical communication device. The method includes: first, the first optical communication device sends a first optical signal to the first electrical relay device. Second, the first electrical relay device receives the first optical signal. Third, the first electrical relay device determines whether the first optical signal has malfunctioned or experienced quality degradation. Fourth, if so, the first electrical relay device shuts off the laser corresponding to the first optical signal. Fifth, if not, the first electrical relay device sends a second optical signal to the second optical communication device. The second optical signal is an optical signal that has undergone signal regeneration and power amplification processing by the first electrical relay device. For an explanation of the beneficial effects of this aspect, please refer to the first aspect; specific details will not be repeated here.

[0016] Based on the second aspect, in an optional implementation, the optical communication system further includes a second electrical relay device. After the first electrical relay device shuts down the laser corresponding to the first optical signal, the method further includes: first, the second electrical relay device receives the second optical signal; second, the second electrical relay device determines that the second optical signal has failed; and third, the second electrical relay device shuts down the laser corresponding to the second optical signal. Based on this implementation, if the first electrical relay device shuts down the laser, the second electrical relay device will also shut down the laser, successfully ensuring protection switching.

[0017] Based on the second aspect, in an optional implementation, the optical communication system further includes a second electrical relay device. After the first electrical relay device sends a second optical signal to the second optical communication device, the method further includes: first, the second electrical relay device receives the second optical signal; second, the second electrical relay device determines that the second optical signal has malfunctioned or experienced quality degradation; and third, the second electrical relay device shuts down the laser corresponding to the second optical signal.

[0018] A third aspect of this invention provides an electrical relay device. The electrical relay device includes an optoelectronic processing module, a processor, and a laser connected to each other. The optoelectronic processing module receives optical signals. The optoelectronic processing module determines that the optical signal has malfunctioned or its quality has deteriorated. The processor is used to shut down the laser corresponding to the optical signal. For an explanation of the beneficial effects of this aspect, please refer to the first aspect; specific details will not be repeated here.

[0019] Based on the third aspect, in an optional implementation, the photoelectric processing module determines that the optical signal has experienced quality degradation when it determines that the optical signal meets at least one of the following conditions: the optical power of the optical signal is less than or equal to a first threshold; the optical signal-to-noise ratio (OSNR) of the optical signal is greater than or equal to a second threshold; the bit error rate (BER) of the electrical signal corresponding to the optical signal is greater than or equal to a third threshold; the number of BER errors in the electrical signal corresponding to the optical signal is greater than or equal to a fourth threshold within a time window; or the forward error correction bit rate of the electrical signal corresponding to the optical signal is greater than or equal to a fifth threshold.

[0020] Based on the third aspect, in one optional implementation, when the photoelectric processing module determines that the optical signal has failed, it indicates that the optical signal has failed: signal loss (LOS); frame loss alarm; multiframe loss alarm; alarm indication signal (AIS); disconnection indication (OCI); lockout indication (LCK); or segment inspection overhead (SM) trace word mismatch alarm.

[0021] A fourth aspect of this invention provides an optical communication system. The optical communication system includes a first optical communication device, a first electrical relay device, and a second optical communication device connected in sequence. The first optical communication device transmits a first optical signal to the first electrical relay device. The first electrical relay device receives the first optical signal. The first electrical relay device determines whether the first optical signal has malfunctioned or experienced quality degradation. If so, the first electrical relay device shuts off the laser corresponding to the first optical signal. If not, the first electrical relay device transmits a second optical signal to the second optical communication device. The second optical signal is an optical signal processed by signal regeneration and power amplification by the first electrical relay device.

[0022] Based on the fourth aspect, in an optional implementation, the optical communication system further includes a second electrical relay device connected between the first electrical relay device and the second optical communication device. The second electrical relay device is used to: receive a second optical signal from the first electrical relay device; determine that the second optical signal has malfunctioned; and shut down the laser corresponding to the second optical signal.

[0023] Based on the fourth aspect, in an optional implementation, the optical communication system further includes a second electrical relay device connected between the first electrical relay device and the second optical communication device. The second electrical relay device is used to: receive a second optical signal from the first electrical relay device; determine if the second optical signal has malfunctioned or experienced quality degradation; and shut down the laser corresponding to the second optical signal. Attached Figure Description

[0024] Figure 1This is a first structural example diagram of the optical communication system provided in this application;

[0025] Figure 2 This is a flowchart illustrating the steps of a first optical signal transmission control method provided in an embodiment of this application.

[0026] Figure 3 A second structural example diagram of the optical communication system provided in this application;

[0027] Figure 4 This is a flowchart illustrating the steps of a third optical signal transmission control method provided in an embodiment of this application.

[0028] Figure 5 A third structural example diagram of the optical communication system provided in this application;

[0029] Figure 6 This is a flowchart illustrating the steps of the fourth optical signal transmission control method provided in this application embodiment;

[0030] Figure 7 This is a structural example diagram of the electrical relay device provided in the embodiments of this application;

[0031] Figure 8 This is a structural example diagram of the optical communication device provided in this application. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Figure 1 This is a first structural example diagram of the optical communication system provided in this application. Figure 1 The optical communication system shown includes a first optical communication device 101 and a second optical communication device 102. A primary transmission path and a backup transmission path are connected between the first optical communication device 101 and the second optical communication device 102.

[0034] The primary transmission path includes a first primary transmission path 111 and a second primary transmission path 112. The first primary transmission path 111 transmits the primary optical signal from the first optical communication device 101 to the second optical communication device 102. The second primary transmission path 112 transmits the primary optical signal from the second optical communication device 102 back to the first optical communication device 101. The backup transmission path includes a first backup transmission path 121 and a second backup transmission path 122. The first backup transmission path 121 transmits the backup optical signal from the first optical communication device 101 to the second optical communication device 102. The second backup transmission path 122 transmits the backup optical signal from the second optical communication device 102 back to the first optical communication device 101. The primary and backup optical signals carry the same service.

[0035] The second optical communication device 102 determines that the difference between the optical power of the received primary optical signal and the backup optical signal is greater than or equal to the switching threshold. Then, the second optical communication device 102 performs protection switching. When the second optical communication device 102 performs protection switching, it acquires the service carried by the backup optical signal transmitted via the first backup transmission path 121. For an explanation of how the first optical communication device 101 implements protection switching, please refer to the description of the second optical communication device 102; details will not be repeated here.

[0036] As the transmission distance between the first optical communication device 101 and the second optical communication device 102 increases, the optical signal-to-noise ratio (OSNR) of the primary optical signal transmitted along the first primary transmission path will decrease. A low OSNR can lead to bit errors in the services carried by the primary optical signal, or even failure to transmit the services successfully. To improve the OSNR, one or more electrical repeater devices are connected along the first primary transmission path. Figure 1Taking the primary transmission path shown as an example, the first primary transmission path 111 is connected to an electrical repeater 132. This electrical repeater 132 is connected to the first primary transmission path 111 and located between the first optical communication device 101 and the second optical communication device 102. The electrical repeater 132 receives the primary optical signal from the first optical communication device 101 via the first primary transmission path 111. The electrical repeater 132 performs photoelectric conversion on the primary optical signal to obtain a primary electrical signal. The electrical repeater 132 performs signal regeneration and power amplification on the primary electrical signal. The electrical repeater 132 then obtains the processed primary optical signal through electro-optical conversion. The processed primary optical signal continues to be transmitted to the second optical communication device 102 along the first primary transmission path 111. The electrical repeater on the first primary transmission path 111 compensates for the decrease in the optical signal-to-noise ratio of the primary optical signal when the distance between the first optical communication device 101 and the second optical communication device 102 is increased. To improve the OSNR of the second primary transmission path, the second primary transmission path 112 can be connected to one or more electrical repeater devices 131. For a description of electrical repeater device 131, please refer to the description of electrical repeater device 132; details will not be repeated here. Electrical repeater device 131 and electrical repeater device 132 can be two independent devices. Electrical repeater device 131 and electrical repeater device 132 can also be integrated into the same device; there is no specific limitation. For a description of connecting electrical repeater devices on the backup transmission path, please refer to the description of connecting electrical repeater devices on the primary transmission path; details will not be repeated here.

[0037] However, the electrical repeater 132 has the capability to regenerate and amplify optical signals. Therefore, even if a fiber break occurs between the electrical repeater 132 and the first optical communication device 101, the electrical repeater 132 can still transmit the processed primary optical signal to the second optical communication device 102. The second optical communication device 102 cannot perform protection switching in the event of a fiber break simply by relying on the magnitude of the optical power of the processed primary optical signal.

[0038] The second optical communication device 102 performs photoelectric conversion on the primary optical signal to obtain a primary electrical signal. The second optical communication device 102 can detect this primary electrical signal to determine if a fiber break has occurred. The second optical communication device 102 switches to the first backup transmission path 121 to obtain a backup optical signal. However, if the fiber break between the electrical repeater 132 and the first optical communication device 101 has been resolved (i.e., the first optical communication device 101 can successfully transmit the primary optical signal to the electrical repeater 132), the second optical communication device 102 cannot switch back to the first primary transmission path 111. Furthermore, determining whether to perform protection switching by detecting the primary electrical signal requires photoelectric conversion before detection, increasing the delay in detecting protection switching.

[0039] Therefore, this application provides a control method for optical signal transmission. This method enables timely protection switching, effectively preventing protection switching failures that could lead to the inability to successfully acquire the service carried by the optical signal, thus ensuring successful service transmission. For the method provided in this embodiment, please refer to [link to relevant documentation]. Figure 2 As shown. Among them, Figure 2 This is a flowchart illustrating the steps of a first optical signal transmission control method provided in an embodiment of this application. The method shown in this embodiment is based on... Figure 1 The optical communication system shown is executed. Among them, Figure 2 The example shown is a first optical communication device sending a primary optical signal to a second optical communication device based on a first primary transmission path.

[0040] Step 201: The first optical communication device sends the primary optical signal to the electrical relay device.

[0041] The first optical communication device transmits the primary optical signal to the electrical relay device via the optical fiber between the first optical communication device and the electrical relay device.

[0042] Step 202: The electrical relay equipment determines whether the primary optical signal has experienced a first switching trigger event. If not, proceed to step 203; if yes, proceed to step 204.

[0043] The first switching trigger event shown in this embodiment refers to a failure or quality degradation of the primary optical signal. The optional process for the electrical repeater to determine that the primary optical signal has experienced quality degradation is described below.

[0044] Optional procedure 1: The electrical repeater determines whether the optical power of the primary optical signal is less than or equal to a first threshold value. If the electrical repeater determines that the optical power of the primary optical signal is less than or equal to the first threshold value, the electrical repeater determines that the primary optical signal has experienced quality degradation.

[0045] Optionally, if the electrical repeater determines that the optical power of the primary optical signal is less than or equal to the first threshold value, the electrical repeater may first send an adjustment instruction message to the first optical communication device. This adjustment instruction message instructs the first optical communication device to increase the optical power of the primary optical signal. If, after sending the adjustment instruction message to the first optical communication device, the electrical repeater further determines that the optical power of the primary optical signal is less than or equal to the first threshold value, the electrical repeater determines that the primary optical signal has experienced quality degradation.

[0046] Optional procedure 2: The electrical repeater determines whether the OSNR of the primary optical signal is greater than or equal to the second threshold value. If the electrical repeater determines that the OSNR of the primary optical signal is greater than or equal to the second threshold value, the electrical repeater determines that the primary optical signal has degraded.

[0047] This embodiment does not limit the specific values ​​of the first and second thresholds mentioned above. If the primary optical signal satisfies optional process 1 and / or optional process 2, it indicates that the loss during transmission of the primary optical signal from the first optical communication device to the electrical repeater is too high. This results in the loss of the service carried by the primary optical signal or a reduction in the accuracy of decoding the service from the primary optical signal.

[0048] When an electrical repeater determines that the primary optical signal has lost signal (LOS), it indicates a fault in the primary optical signal. LOS refers to a situation where the electrical repeater continuously determines that the optical power of the optical signal is less than or equal to a fault threshold.

[0049] Optionally, the electrical repeater device shown in this embodiment can have a first anti-shake duration preset. When the electrical repeater device determines that a first switching trigger event has occurred, the timing of this first anti-shake duration is started. During the duration of this first anti-shake duration, if the primary optical signal continuously experiences the first switching trigger event, step 203 is then executed. This effectively avoids protection switching due to false detection, improving the accuracy of protection switching. For example, the first anti-shake duration can be 1 millisecond.

[0050] Step 203: The electrical relay device determines whether a second switching trigger event has occurred in the main power signal. If yes, proceed to step 204; otherwise, proceed to step 205.

[0051] The electrical repeater performs photoelectric conversion on the primary optical signal to obtain the primary electrical signal. The electrical repeater then performs signal regeneration and power amplification on this primary electrical signal. Upon acquiring the primary electrical signal, the electrical repeater determines whether a second switching trigger event has occurred. In this embodiment, the second switching trigger event refers to a failure or quality degradation of the primary electrical signal. The optional process by which the electrical repeater determines that the primary electrical signal has experienced quality degradation is described below.

[0052] Optional procedure 1: The electrical relay device determines whether the bit error rate of the primary electrical signal is greater than or equal to the third threshold. If the electrical relay device determines that the bit error rate of the primary electrical signal is greater than or equal to the third threshold, the electrical relay device determines that a second switching trigger event has occurred for the primary electrical signal.

[0053] Optional step 2: The electrical relay equipment determines whether the number of bit errors in the primary power signal within the time window is greater than or equal to the fourth threshold. For example, the bit error could be a bit interpolation check code (e.g., BIP-8). If the electrical relay equipment determines that the number of bit errors in the primary power signal within the time window is greater than or equal to the fourth threshold, it determines that the primary power signal has experienced quality degradation. This embodiment does not limit the duration of the time window. For example, the duration of the time window could be 10 milliseconds (ms).

[0054] Option 3 involves the following steps: First, the electrical relay device performs forward error correction (FEC) on the primary power signal to obtain the forward error correction code rate. Second, the electrical relay device determines whether the forward error correction code rate is greater than or equal to the fifth threshold. If the electrical relay device determines that the forward error correction code rate is greater than or equal to the fifth threshold, it determines that a second switching trigger event has occurred for the primary power signal.

[0055] This embodiment does not limit the specific values ​​of the third to fifth thresholds. For explanations of the third, fourth, and fifth thresholds, please refer to the above explanations of the first and second thresholds, which will not be repeated here.

[0056] The electrical relay equipment determines that the primary power signal has failed if it detects at least one of the following states: frame loss alarm, multiframe loss alarm, alarm indication signal (AIS), open connection indication (OCI), lockout indication (LCK), or trace word mismatch alarm with section monitoring overhead (SM).

[0057] A frame loss alarm occurs when a relay device fails to determine the frame delimiter byte for N consecutive transmitted frames. The frame delimiter byte indicates the start and end positions of a transmitted frame. A multiframe loss alarm occurs when a relay device fails to determine the multiframe delimiter byte for M consecutive transmitted frames. The multiframe delimiter byte indicates the start and end positions of a multiframe. M and N are both positive integers greater than 1; this embodiment uses a value of 5 for both M and N as an example. When the relay device determines that the primary power signal carries the AIS, it determines that a fault has occurred in the upstream transmission of the primary power signal. For example... Figure 1In the example shown, if the electrical repeater determines that the primary electrical signal carries the AIS, it indicates that the fault point is located on the optical fiber between the first optical communication device 101 and the electrical repeater 132. And / or the fault point is located inside the first optical communication device 101. A fault point occurs in the upstream transmission of the electrical repeater 132, causing the primary electrical signal acquired by the electrical repeater to carry the AIS. If the electrical repeater determines that the primary electrical signal carries an OCI, it indicates that the upstream device is not configured with a board for transmitting the primary optical signal or that the board is faulty. If the electrical repeater determines that the primary electrical signal carries an LCK, it indicates that the primary transmission path for transmitting the primary optical signal has been locked. That is, the primary transmission path is no longer transmitting the primary optical signal. If the electrical repeater determines that the SM trace word mismatch alarm can be caused by the fact that the trail trace identifier (TTI) carried by the primary electrical signal is inconsistent with the TTI stored by the electrical repeater. This indicates that there is an error in the transmission path of the primary optical signal.

[0058] Optionally, the electrical repeater device shown in this embodiment can have a second anti-jitter duration preset. When the electrical repeater device determines that a second switching trigger event has occurred, the timing of this second anti-jitter duration is started. During the duration of this second anti-jitter duration, if the primary optical signal continuously experiences the second switching trigger event, step 204 is then executed. This effectively avoids protection switching due to false detection, improving the accuracy of protection switching.

[0059] Step 204: The electrical relay equipment shuts off the target laser.

[0060] It can be seen that the electrical repeater determines that a first switching trigger event has occurred in the primary optical signal via step 202, or determines that a second switching trigger event has occurred in the primary electrical signal via step 203. Therefore, the electrical repeater executes this step.

[0061] The electrical relay device shown in this embodiment includes one or more lasers. Each laser is used to send an optical signal to the next-hop device. This embodiment uses... Figure 1 As shown in the example, the next-hop device is a second optical communication device. If the method shown in this embodiment is applied to other network scenarios, the next-hop device can be another electrical relay device connected to the electrical relay device.

[0062] The target laser shown in this embodiment is one of the lasers included in the electrical relay, and this target laser corresponds to the main optical signal. The electrical relay device performs photoelectric conversion on the main optical signal to obtain a main electrical signal. The electrical relay device then performs signal regeneration and power amplification on the main electrical signal. The electrical relay device modulates the processed main electrical signal onto the optical signal from the target laser, performs electro-optical conversion, and obtains the processed main optical signal. The electrical relay device then transmits the processed main optical signal to the next hop device.

[0063] In this embodiment, the electrical repeater determines that either the first switching trigger event shown in step 202 or the second switching trigger event shown in step 203 has occurred in the primary optical signal. In this case, the electrical repeater shuts down the target laser. When the target laser is shut down, it will not send optical signals to the next-hop device.

[0064] When the electrical relay equipment shuts down the target laser, the second optical communication device cannot receive the optical signal via the primary transmission path. Therefore, the second optical communication device directly performs protection switching. It is evident that either a first switching trigger event occurs in the primary optical signal, or a second switching trigger event occurs in the primary electrical signal, both of which can trigger the protection switching of the second optical communication device. Furthermore, the second optical communication device performs protection switching even when the electrical relay equipment has shut down the target laser. The second optical communication device can perform protection switching without detecting the photoelectric converted electrical signal, thus improving the timeliness of protection switching.

[0065] Step 205: The electrical relay equipment sends the processed master optical signal to the second optical communication equipment.

[0066] Following step 203, the first electrical repeater determines that no second switching trigger event has occurred in the primary power signal. This indicates that the primary power signal is in a normal state, and the second optical communication device does not need to perform protection switching for the first primary transmission path used to transmit this primary power signal. The electrical repeater then sends the primary optical signal, after signal regeneration and power amplification, to the second optical communication device.

[0067] Step 206: The second optical communication device acquires services.

[0068] The second optical communication device receives the primary optical signal. The second optical communication device performs photoelectric conversion, demapping, decoding and other processing on the primary optical signal to obtain the service carried by the primary optical signal.

[0069] The electrical relay equipment included in the second primary transmission path determines that the primary optical signal has failed or deteriorated in quality, triggering the first optical communication equipment to perform a protection switching process. Please refer to [link to relevant documentation]. Figure 2 As shown, details will not be elaborated further. For the process by which the electrical repeater equipment on the backup path determines if the backup optical signal has failed or deteriorated, please refer to [link to relevant documentation]. Figure 2 The process of determining whether the primary optical signal has failed or deteriorated is shown, but the details are not elaborated here.

[0070] Taking the first backup transmission path as an example, if the electrical repeater equipment included in the first backup transmission path determines that the backup optical signal has failed or experienced quality degradation, then the second optical communication equipment records the event of the failure in the first backup transmission path. This ensures that maintenance personnel can accurately determine when a failure has occurred in the first backup transmission path, improving the efficiency and accuracy of locating the fault within the first backup transmission path.

[0071] Using the method shown in this embodiment, the electrical repeater has the ability to detect whether the primary optical signal has failed or deteriorated in quality. Therefore, if the electrical repeater determines that the primary optical signal has failed or deteriorated in quality, it can shut down the laser corresponding to that primary optical signal. If the electrical repeater will not transmit an optical signal to the second optical communication device through that laser, it can trigger the second optical communication device to perform protection switching. Regardless of whether the optical signal fails or deteriorates in quality, the second optical communication device can be triggered to perform protection switching, effectively avoiding protection switching failure.

[0072] The optical communication system provided in this application can also be found in [reference 1]. Figure 3 As shown. Among them, Figure 3 This is a second structural example diagram of the optical communication system provided in this application. Figure 3 Corresponding optical communication systems and Figure 1 The difference between the corresponding optical communication systems is that, Figure 3 In the corresponding optical communication system, the first primary transmission path includes two electrical repeater devices. Specifically, the first primary transmission path 321 includes a first electrical repeater device 311 and a second electrical repeater device 312. Furthermore, the first optical communication device 301, the first electrical repeater device 311, the second electrical repeater device 312, and the second optical communication device 302 are connected sequentially. For a detailed description of the first optical communication device 301 and the second optical communication device 302, please refer to [link to relevant documentation]. Figure 1 The corresponding explanations will not be elaborated upon here.

[0073] based on Figure 3 The corresponding optical communication system is described below. Figure 4 The execution process of the method provided in the embodiments of this application is illustrated below. Wherein, Figure 4 This is a flowchart illustrating the steps of a third optical signal transmission control method provided in an embodiment of this application.

[0074] Step 401: The first optical communication device sends the first primary optical signal to the first electrical relay device.

[0075] Step 402: The first electrical relay device determines whether the first primary optical signal has a first switching trigger event. If not, proceed to step 403; if yes, proceed to step 404.

[0076] Step 403: The first electrical relay device determines whether the first main power signal has a second switching trigger event. If yes, proceed to step 404; otherwise, proceed to step 406.

[0077] For the execution process of steps 401-403, please refer to [link / reference]. Figure 2 The corresponding steps 201-203 are shown below, and will not be elaborated further.

[0078] Step 404: The first electrical relay device shuts off the first target laser.

[0079] The first target laser is the laser in the first electrical relay device that corresponds to the first primary optical signal. For a description of the first target laser, see [link to documentation]. Figure 2 The description of the target laser shown in step 204 will not be repeated here.

[0080] Step 405: The second electrical relay device shuts off the second target laser.

[0081] In this embodiment, via step 404, the first electrical repeater has turned off the first target laser. Therefore, the second electrical repeater cannot successfully receive the optical signal from the first electrical repeater. Since the second electrical repeater cannot receive the optical signal from the first electrical repeater, it determines that the primary optical signal has failed. For an explanation of how the second electrical repeater determines that the primary optical signal has failed, please refer to [link to relevant documentation]. Figure 2 The corresponding step 202, which describes the electrical relay equipment determining that the primary optical signal has failed, will not be elaborated further.

[0082] If the second electrical relay device shuts down the second target laser, the second optical communication device will be unable to receive optical signals via the first primary transmission path. Therefore, the second optical communication device will directly perform protection switching. It is evident that if the first electrical relay device shuts down the first target laser, the second electrical relay device will also shut down the second target laser. This successfully ensures the protection switching of the second optical communication device.

[0083] Step 406: The first electrical relay device sends a second primary optical signal to the second electrical relay device.

[0084] Following step 403, the first electrical repeater determines that no second switching trigger event has occurred for the first primary optical signal. This indicates that the transmission of the primary optical signal before the first electrical repeater has been normal. After processing the first primary electrical signal, the first electrical repeater sends the processed second primary optical signal to the second electrical repeater. For an explanation of the process by which the first electrical repeater processes the first primary electrical signal, please refer to [link to relevant documentation]. Figure 2 The specific instructions for the corresponding electrical relay equipment in processing the main electrical signals are not detailed here.

[0085] Step 407: The second electrical relay device determines whether the second primary optical signal has a first switching trigger event. If not, proceed to step 408; if yes, proceed to step 409.

[0086] Step 408: The second electrical relay device determines whether the second main power signal has a second switching trigger event. If yes, proceed to step 409; otherwise, proceed to step 410.

[0087] Step 409: The second electrical relay device shuts off the second target laser.

[0088] Step 410: The second electrical relay device sends the third primary optical signal to the second optical communication device.

[0089] Step 411: The second optical communication device acquires services.

[0090] For steps 407-411, please refer to [link / reference]. Figure 2 The corresponding steps 202-206 will not be described in detail.

[0091] The description of the number of electrical relay devices included in the first primary transmission path in this embodiment is an optional example. In other embodiments, the primary transmission path may also include two or more electrical relay devices. For the specific execution process, please refer to the example shown in this embodiment, which will not be elaborated upon here.

[0092] The first backup transmission path, the second primary transmission path, and the second backup transmission path each connect to two or more electrical repeater devices. For the process of each electrical repeater device detecting optical signal failures or quality degradation, please refer to [link to documentation / reference]. Figure 4 As shown, the specifics will not be elaborated further.

[0093] Using the method shown in this embodiment, multiple electrical repeater devices are connected on the first primary transmission path. These repeater devices have the ability to detect whether the primary optical signal has malfunctioned or experienced quality degradation. Therefore, if an electrical repeater device determines that the primary optical signal has malfunctioned or experienced quality degradation, it can shut down the laser corresponding to that primary optical signal. Furthermore, the shutdown of the target laser in the upstream repeater device directly leads to the shutdown of the target laser in the downstream repeater device. It is understood that when the upstream repeater device determines that the optical signal has malfunctioned or experienced quality degradation, it will transmit this information to the downstream repeater device by shutting down the laser, causing the downstream repeater device to shut down the target laser. This ensures that the second optical communication device successfully performs protection switching, effectively avoiding protection switching failures. Moreover, when the upstream repeater device shuts down the target laser, the downstream repeater device does not need to detect the electrical signal after photoelectric conversion to directly shut down the target laser, improving the timeliness of protection switching.

[0094] The optical communication system provided in this application can also be found in [reference 1]. Figure 5 As shown. Among them, Figure 5 This is a third structural example diagram of the optical communication system provided in this application. Figure 5 The corresponding optical communication system includes a first optical communication device 501 and a second optical communication device 502. This optical communication system also includes electrical repeater equipment connected to the primary transmission path and electrical repeater equipment connected to the backup transmission path. For details, please refer to [link to relevant documentation]. Figure 1 The corresponding explanations are not detailed here. The optical communication system shown in this example also includes a network management device 500. This network management device 500 is connected to the first optical communication device 501, the second optical communication device 502, and each electrical repeater device. Figure 5 The illustration shows an example where each transmission path connects to one electrical repeater device. For example, one electrical repeater device 511 is connected to the first primary transmission path. In other examples, each transmission path may connect to two or more electrical repeater devices; please refer to [link to relevant documentation] for details. Figure 3 The corresponding explanations will not be elaborated upon here.

[0095] based on Figure 5 The corresponding optical communication system is described below. Figure 6 The execution process of the method provided in the embodiments of this application is illustrated below. Wherein, Figure 6 This is a flowchart illustrating the steps of a fourth optical signal transmission control method provided in an embodiment of this application.

[0096] Step 601: The first optical communication device sends a service identifier to the network management device.

[0097] If the first optical communication device needs to send a service to the second optical communication device, then the first optical communication device sends the service identifier to the network management device. This embodiment does not limit the type of service identifier, as long as the service identifier has a one-to-one correspondence with the service.

[0098] The network management device pre-creates a service transmission list. This service transmission list includes the correspondence between service identifiers and the identifiers of each transmission node. For example, in... Figure 5 In the corresponding example, the service transmission list includes the identifier of the first optical communication device 501, the identifier of the electrical relay device 511, and the identifier of the second optical communication device 502. Based on this service transmission list, the network management device 500 determines that the transmission of the service sequentially passes through the first optical communication device 501, the electrical relay device 511, and the second optical communication device 502.

[0099] Step 602: The first optical communication device sends the primary optical signal to the electrical relay device.

[0100] Step 603: The electrical relay equipment determines whether the primary optical signal has experienced a first switching trigger event. If not, proceed to step 604; if yes, proceed to step 605.

[0101] Step 604: The electrical relay device determines whether a second switching trigger event has occurred in the main power signal. If yes, proceed to step 605; otherwise, proceed to step 607.

[0102] Step 605: The electrical relay equipment shuts off the target laser.

[0103] For the execution process of steps 602-605, please refer to [link / reference]. Figure 2 The corresponding steps 201-204 are shown below, and will not be elaborated further.

[0104] Step 606: The electrical relay equipment sends a fault indication message to the network management equipment.

[0105] In this embodiment, when the electrical relay device determines that a first switching trigger event or a second switching trigger event has occurred, the electrical relay device sends a fault indication message to the network management device. This fault indication message carries the identifier of the electrical relay device and a message indicating the first or second switching trigger event.

[0106] It can be seen that if the network management equipment determines that the fault indication message indicates the first switchover trigger event, it can determine that the primary optical signal has failed or its quality has deteriorated. The network management equipment displays or sends a first prompt message to the terminal carried by the maintenance personnel. This first prompt message includes a service transmission list, the identifier of the electrical repeater, and a message indicating the first switchover trigger event. Based on this first prompt message, the maintenance personnel can determine that a fault has occurred at the electrical repeater during the transmission of the primary optical signal, and that the fault type is the first switchover trigger event. This improves the efficiency and accuracy of maintenance personnel in troubleshooting the first switchover trigger event.

[0107] Similarly, if the network management device determines that the fault indication message indicates a second switchover trigger event, it can confirm that a fault or quality degradation has occurred in the primary power signal. The network management device displays or sends this second prompt information to the terminal carried by the maintenance personnel. This second prompt information includes a service transmission list, the identifier of the electrical relay device, and a message indicating the second switchover trigger event. Based on this second prompt information, the maintenance personnel can determine that a fault has occurred at the electrical relay device during the transmission of the primary power signal, and that the fault type is a second switchover trigger event. This improves the efficiency and accuracy of maintenance personnel in troubleshooting second switchover trigger events.

[0108] It should be clarified that the description of how the network management device notifies the maintenance personnel of the first and second switchover trigger events in this embodiment is optional and not specifically limited. It is sufficient that the maintenance personnel can promptly and accurately determine whether the primary optical transmission signal has experienced a first or second switchover trigger event at the electrical repeater.

[0109] Step 607: The electrical relay equipment sends the processed master optical signal to the second optical communication equipment.

[0110] Step 608: The second optical communication device acquires services.

[0111] For the execution process of steps 607-608, please refer to [link / reference]. Figure 2 The corresponding steps 205-206 are shown below, and will not be elaborated further.

[0112] Using the method shown in this embodiment, the network management device can promptly determine whether a first switching trigger event or a second switching trigger event has occurred in the primary optical signal. This improves the efficiency of maintenance personnel in repairing the primary transmission path. After a protection switching event occurs in the primary transmission path, the fault point of the primary transmission path can be identified in a timely manner.

[0113] Figure 7 This is a structural example diagram of an electrical repeater device provided in an embodiment of this application. The electrical repeater device shown in this embodiment includes a photoelectric processing module 701 and a laser 703 connected in sequence. The electrical repeater device also includes a processor 702 connected to both the photoelectric processing module 701 and the laser 703. The photoelectric processing module 701 includes a receiver optical subassembly (ROSA) for photoelectric conversion and a transmitter optical subassembly (TOSA) for electro-optical conversion.

[0114] The processor 702 shown in this embodiment can be one or more field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), system-on-chips (SoCs), central processors (CPUs), network processors (NPs), digital signal processors (DSPs), microcontrollers (MCUs), programmable logic devices (PLDs), or other integrated chips, or any combination of the above chips or processors.

[0115] If the electrical relay device shown in this embodiment is used to perform... Figure 2 The illustrated embodiment. The photoelectric processing module 701 executes steps 202 and 203. If the photoelectric processing module 701 determines via step 202 that a first switching trigger event has occurred in the primary optical signal, or via step 203 that a second switching trigger event has occurred in the primary electrical signal, the photoelectric processing module 701 sends a switching instruction to the processor 703. The processor 703 sends a shutdown instruction to the laser 703 according to the switching instruction to execute step 204. That is, the laser is shut down according to the shutdown instruction from the processor 703. If the photoelectric processing module 701 determines via step 202 that the first switching trigger event has not occurred in the primary optical signal and via step 203 that the second switching trigger event has not occurred in the primary electrical signal, the photoelectric processing module 701 receives the optical signal from the laser 702 and modulates the primary electrical signal onto the optical signal to achieve electro-optical conversion and obtain the processed primary optical signal. The photoelectric processing module 701 executes step 205.

[0116] The electrical relay device shown in this embodiment is a first electrical relay device, and is used to perform... Figure 4In the illustrated embodiment, the photoelectric processing module 701 executes steps 402 and 403. If the photoelectric processing module 701 determines via step 402 that a first switching trigger event has occurred in the first primary optical signal, or if the photoelectric processing module 701 determines via step 403 that a second switching trigger event has occurred in the first primary electrical signal, the photoelectric processing module 701 sends a switching instruction to the processor 703. The processor 703 sends a shutdown instruction to the laser 703 according to the switching instruction to execute step 404. That is, the laser is shut down according to the shutdown instruction from the processor 703. If the photoelectric processing module 701 determines via step 402 that a first switching trigger event has not occurred in the first primary optical signal and via step 403 that a second switching trigger event has not occurred in the first primary electrical signal, the photoelectric processing module 701 receives the optical signal from the laser 702 and modulates the first primary electrical signal onto the optical signal to achieve electro-optical conversion to obtain the second primary optical signal. The photoelectric processing module 701 executes step 406.

[0117] The electrical relay device shown in this embodiment is a second electrical relay device, and is used to perform... Figure 4 In the illustrated embodiment, the photoelectric processing module 701 executes steps 407 and 408. If the photoelectric processing module 701 determines via step 407 that a first switching trigger event has occurred in the second primary optical signal, or if the photoelectric processing module 701 determines via step 408 that a second switching trigger event has occurred in the primary electrical signal, the photoelectric processing module 701 sends a switching instruction to the processor 703. The processor 703 sends a shutdown instruction to the laser 703 according to the switching instruction to execute step 409. That is, the laser is shut down according to the shutdown instruction from the processor 703. If the photoelectric processing module 701 determines via step 407 that a first switching trigger event has not occurred in the primary optical signal and via step 408 that a second switching trigger event has not occurred in the primary electrical signal, the photoelectric processing module 701 receives the optical signal from the laser 702 and modulates the primary electrical signal onto the optical signal to achieve electro-optical conversion to obtain a third primary optical signal. The photoelectric processing module 701 executes step 410.

[0118] The electrical relay device shown in this embodiment is used to perform Figure 6In the illustrated embodiment, the photoelectric processing module 701 is used to execute steps 604 and 605. If the photoelectric processing module 701 determines via step 603 that a first switching trigger event has occurred in the primary optical signal, or the photoelectric processing module 701 determines via step 604 that a second switching trigger event has occurred in the primary electrical signal, the photoelectric processing module 701 sends a switching instruction to the processor 703. The processor 703 sends a shutdown instruction to the laser 703 according to the switching instruction to execute step 605. That is, the laser is shut down according to the shutdown instruction from the processor 703. If the photoelectric processing module 701 determines via step 603 that the first switching trigger event has not occurred in the primary optical signal and via step 604 that the second switching trigger event has not occurred in the primary electrical signal, the photoelectric processing module 701 receives the optical signal from the laser 702 and modulates the primary electrical signal onto the optical signal to achieve electro-optical conversion and obtain the processed primary optical signal. The photoelectric processing module 701 executes step 606. The photoelectric processing module 701 is also used to execute step 606.

[0119] Combination Figure 8 The above-described method embodiments provided in this application demonstrate that they can ensure timely protection switching of optical communication equipment. Figure 8 This is a structural example diagram of the optical communication equipment provided in this application. The optical communication equipment includes an optical fiber line auto switch protection device (OLP) 801 and an optical transport unit (OTU) 802 connected to the OLP 801. Taking the optical communication equipment shown in this example as the second optical communication equipment described in the above embodiment, the OLP 801 is used to detect whether protection switching needs to be performed based on the primary optical signal and the backup optical signal. If the OLP 801 determines that protection switching needs to be performed, the OLP 801 sends the backup optical signal to the OTU 802. If the OLP 801 determines that protection switching does not need to be performed, the OLP 801 sends the primary optical signal to the OTU 802. After obtaining the optical signal from the OLP 801, the OTU 802 obtains the service carried by the optical signal through photoelectric conversion, demapping, decoding, etc.

[0120] In this embodiment, the OLP801 detects whether protection switching has been performed. If the electrical repeater shuts down the laser, the OLP801 can detect a fault or quality degradation in the optical signal by detecting the optical signal from the repeater. This eliminates the need for the OTU802 to detect protection switching, ensuring the timely execution of protection switching by the optical communication equipment.

[0121] This application also provides an optical communication system. The optical communication system shown in this embodiment can be found in [reference needed]. Figure 1 , Figure 3 or Figure 5 As shown, specific details will not be elaborated further. This embodiment does not limit the type of optical communication system. For example, the optical communication system can be an optical transport network (OTN), a passive optical network (PON), a data center network, or a wavelength division multiplexing network, etc.

[0122] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for optical signal transmission, characterized in that, The method includes: Electrical relay equipment receives optical signals; The electrical relay equipment determines that the optical signal has malfunctioned or deteriorated in quality; The electrical relay device shuts off the laser corresponding to the optical signal.

2. The method according to claim 1, characterized in that, The electrical relay device determines that the optical signal has deteriorated in quality by determining that the optical power of the optical signal is less than or equal to a first threshold value.

3. The method according to claim 1 or 2, characterized in that, The electrical relay device determines that the optical signal has deteriorated in quality by: the electrical relay device determining that the optical signal-to-noise ratio (OSNR) of the optical signal is greater than or equal to a second threshold value.

4. The method according to any one of claims 1 to 3, characterized in that, The electrical relay device determines that the optical signal has deteriorated in quality by determining that the bit error rate of the electrical signal corresponding to the optical signal is greater than or equal to a third threshold value.

5. The method according to any one of claims 1 to 4, characterized in that, The electrical relay device determines that the optical signal has deteriorated in quality by: the electrical relay device determining that within a time window, the number of bit errors in the electrical signal corresponding to the optical signal is greater than or equal to a fourth threshold value.

6. The method according to any one of claims 1 to 5, characterized in that, The electrical repeater determines that the optical signal has deteriorated in quality by including: The electrical repeater performs forward error correction (FEC) on the electrical signal corresponding to the optical signal to obtain the forward error correction code rate. The electrical relay device determines that the forward error correction code rate is greater than or equal to the fifth threshold value.

7. The method according to any one of claims 1 to 6, characterized in that, The electrical relay device determines that the optical signal has malfunctioned when it determines that the optical signal is in at least one of the following states: Signal loss (LOS), frame loss alarm, multiframe loss alarm, alarm indication signal AIS, disconnection indication signal OCI, lockout indication signal LCK, or segment view overhead (SM) trace word mismatch alarm.

8. The method according to any one of claims 1 to 7, characterized in that, After the electrical relay equipment determines that the optical signal has malfunctioned or deteriorated, the method further includes: The electrical relay device sends a fault indication message to the network management device, the fault indication message being used to indicate that the optical signal has malfunctioned or its quality has deteriorated.

9. A control method for optical signal transmission, characterized in that, The method is applied to an optical communication system, the optical communication system including a first optical communication device, a first electrical relay device, and a second optical communication device, the method comprising: The first optical communication device sends a first optical signal to the first electrical relay device; The first electrical relay device receives the first optical signal; The first electrical relay device determines whether the first optical signal has malfunctioned or deteriorated in quality; If so, the first electrical relay device shuts off the laser corresponding to the first optical signal; If not, the first electrical relay device sends a second optical signal to the second optical communication device. The second optical signal is an optical signal that has been processed by signal regeneration and power amplification by the first electrical relay device.

10. The method according to claim 9, characterized in that, The optical communication system further includes a second electrical relay device. After the first electrical relay device shuts off the laser corresponding to the first optical signal, the method further includes: The second electrical relay device receives the second optical signal; The second electrical relay device determines that the second optical signal has malfunctioned; The second electrical relay device shuts off the laser corresponding to the second optical signal.

11. The method according to claim 9, characterized in that, The optical communication system further includes a second electrical relay device. After the first electrical relay device sends a second optical signal to the second optical communication device, the method further includes: The second electrical relay device receives the second optical signal; The second electrical relay device determines that the second optical signal has malfunctioned or deteriorated in quality; The second electrical relay device shuts off the laser corresponding to the second optical signal.

12. An electrical relay device, characterized in that, The electrical relay equipment includes interconnected optoelectronic processing modules, a processor, and a laser, wherein: The photoelectric processing module is used to receive optical signals; The photoelectric processing module determines that the optical signal has malfunctioned or deteriorated in quality, and the processor is used to shut down the laser corresponding to the optical signal.

13. The electrical relay equipment according to claim 12, characterized in that, When the photoelectric processing module determines that the optical signal has experienced quality degradation, it determines that the optical signal has experienced at least one of the following conditions: The optical power of the optical signal is less than or equal to a first threshold, the optical signal-to-noise ratio (OSNR) of the optical signal is greater than or equal to a second threshold, the bit error rate of the electrical signal corresponding to the optical signal is greater than or equal to a third threshold, the number of bit errors in the electrical signal corresponding to the optical signal within a time window is greater than or equal to a fourth threshold, or the forward error correction bit rate of the electrical signal corresponding to the optical signal is greater than or equal to a fifth threshold.

14. The electrical relay equipment according to claim 12 or 13, characterized in that, When the photoelectric processing module determines that the optical signal has malfunctioned, it determines that the optical signal has malfunctioned. Signal loss (LOS), frame loss alarm, multiframe loss alarm, alarm indication signal AIS, disconnection indication signal OCI, lockout indication signal LCK, or segment view overhead (SM) trace word mismatch alarm.

15. An optical communication system, characterized in that, It includes a first optical communication device, a first electrical relay device, and a second optical communication device connected in sequence. The first optical communication device is used to send a first optical signal to the first electrical relay device; The first electrical relay device is used to receive the first optical signal; The first electrical relay device is used to determine whether the first optical signal has malfunctioned or deteriorated in quality; If so, the first electrical relay device is used to turn off the laser corresponding to the first optical signal; If not, the first electrical relay device is used to send a second optical signal to the second optical communication device, the second optical signal being an optical signal after signal regeneration and power amplification by the first electrical relay device.

16. The optical communication system according to claim 15, characterized in that, The optical communication system further includes a second electrical relay device connected between the first electrical relay device and the second optical communication device, the second electrical relay device being used for: Receive a second optical signal from the first electrical relay device; It has been determined that the second optical signal has malfunctioned; Turn off the laser corresponding to the second optical signal.

17. The optical communication system according to claim 15, characterized in that, The optical communication system further includes a second electrical relay device connected between the first electrical relay device and the second optical communication device, the second electrical relay device being used for: Receive a second optical signal from the first electrical relay device; Determine that the second optical signal has malfunctioned or deteriorated in quality; Turn off the laser corresponding to the second optical signal.

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