Optical transmission system, switching method, optical amplifier board, medium, and electronic device

Abstract

The present disclosure relates to the field of optical communication, and relates to an optical transmission system, a switching method, an optical amplifier board, a medium, and an electronic device, which are able to avoid switching failure of OMSP protection. The switching method is a switching method for redundancy protection of an optical transmission system. The optical transmission system comprises a main optical channel and a standby optical channel. The switching method comprises: acquiring a received optical power of an amplifier in an optical channel among the main optical channel and the standby optical channel through which an optical signal is currently being transmitted; comparing the received optical power with a threshold value, the threshold value being associated with a reference value and a relative threshold, and the relative threshold being associated with an optical fiber characteristic of a span in which the amplifier is located; if the received optical power is lower than the threshold value, turning off light output of the amplifier; and in response to turning off the light output of the amplifier, switching the transmission of the optical signal to the optical channel among the main optical channel and the standby optical channel through which the optical signal is not currently being transmitted.

Description

Optical transmission system and switching method, optical amplifier board, medium and electronic equipment

[0001] This application claims priority to Chinese Patent Application No. 202311397801.1 filed on October 25, 2023, and the contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as a part of this application. Technical Field

[0002] The present disclosure relates to an optical transmission system and switching method, an optical amplifier board, a medium and an electronic device. Background Art

[0003] Optical transmission systems, as the underlying platform for network communications, typically utilize physical routing redundancy for protection. For optical transmission systems such as Synchronous Digital Hierarchy (SDH), Dense Wavelength Division Multiplexing (DWDM), and Optical Transport Network (OTN), Optical Multiplex Section Protection (OMSP) is the most common point-to-point networking method that provides dual-routing redundant protection for optical cables. However, OMSP protection switching often fails.

[0004] Summary of the Invention

[0005] This section is provided to briefly introduce the concepts that will be described in detail in the detailed description below. This section is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] In a first aspect, the present disclosure provides a switching method for redundant protection of an optical transmission system, wherein the optical transmission system includes a main optical channel and a backup optical channel, and the switching method includes: obtaining the received optical power of the amplifier in the optical channel that is currently transmitting an optical signal in the main optical channel and the backup optical channel; comparing the received optical power with a threshold value, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span in which the amplifier is located; if the received optical power is lower than the threshold value, shutting off the light output of the amplifier; in response to shutting off the light output of the amplifier, switching the transmission of the optical signal to the optical channel that is currently not transmitting the optical signal in the main optical channel and the backup optical channel.

[0007] In a second aspect, the present disclosure provides an optical amplifier board, comprising: a first detection module, used to detect the received light power of the amplifier in the main optical channel and the backup optical channel of the optical transmission system, and in the optical channel currently transmitting the optical signal; a processor, used to compare the received light power with a threshold value, and if the received light power is lower than the threshold value, shutting off the light output of the amplifier, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span in which the amplifier is located.

[0008] In a third aspect, the present disclosure provides an optical transmission system comprising the optical amplifier board according to any one of the second aspects.

[0009] In a fourth aspect, the present disclosure provides a computer-readable medium having a computer program stored thereon, which, when executed by a processing device, implements the steps of any one of the methods described in the first aspect.

[0010] In a fifth aspect, the present disclosure provides an electronic device comprising: a storage device storing at least one computer program; and at least one processing device for executing the at least one computer program in the storage device to implement the steps of any one of the methods described in the first aspect.

[0011] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the originals and elements are not necessarily drawn to scale. In the drawings:

[0013] Figure 1 shows the change in amplifier output power of a certain manufacturer's EDFA after degradation under single-wavelength, single-span conditions and different span losses.

[0014] Figure 2 shows the change in amplifier output power of a certain manufacturer's EDFA in a single-span segment with a span loss of 20 dB, after degradation in scenarios with 1, 2, 4, and 8 service channels.

[0015] FIG3 is a flow chart of a switching method for redundant protection of an optical transmission system according to an embodiment of the present disclosure.

[0016] FIG4 shows a schematic diagram of switching of an optical transmission system according to an embodiment of the present disclosure.

[0017] FIG5 is a flowchart of ALS recovery according to an embodiment of the present disclosure.

[0018] FIG6 shows a schematic diagram of a low-frequency top modulation signal according to an embodiment of the present disclosure.

[0019] FIG7 is a schematic diagram of a frame format of optical transmission system ID information according to an embodiment of the present disclosure.

[0020] FIG8 is a schematic block diagram of an optical amplifier board according to an embodiment of the present disclosure.

[0021] FIG9 is another schematic block diagram of an optical amplifier board according to an embodiment of the present disclosure.

[0022] FIG10 is another schematic block diagram of an optical amplifier board according to an embodiment of the present disclosure.

[0023] FIG11 is another schematic block diagram of an optical amplifier board according to an embodiment of the present disclosure.

[0024] FIG12 shows a schematic structural diagram of an electronic device suitable for implementing the embodiments of the present disclosure. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present disclosure in more detail with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0026] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0027] As used herein, the term "including" and its variations are open-ended, i.e., "including but not limited to." The term "based on" means "based, at least in part, on." The term "one embodiment" means "at least one embodiment," the term "another embodiment" means "at least one additional embodiment," and the term "some embodiments" means "at least some embodiments." Other terms are defined in the following description.

[0028] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0029] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0030] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0031] All actions of acquiring signals, information or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0032] It is understandable that before using the technical solutions disclosed in the various embodiments of this disclosure, the type, scope of use, usage scenarios, etc. of the personal information involved in this disclosure should be informed to the user and the user's authorization should be obtained in an appropriate manner in accordance with relevant laws and regulations.

[0033] For example, in response to a user's active request, a prompt message is sent to the user to clearly inform the user that the operation requested will require the acquisition and use of the user's personal information. This allows the user to independently choose whether to provide personal information to the electronic device, application, server, storage medium, or other software or hardware that performs the operations of the disclosed technical solution based on the prompt message.

[0034] As an optional but non-limiting implementation, in response to receiving a user's active request, the prompt information may be sent to the user in the form of a pop-up window, in which the prompt information may be presented in text form. Furthermore, the pop-up window may also contain a selection control for the user to select "agree" or "disagree" to provide personal information to the electronic device.

[0035] It is understandable that the above notification and user authorization process are merely illustrative and do not limit the implementation of the present disclosure. Other methods that comply with relevant laws and regulations may also be applied to the implementation of the present disclosure.

[0036] At the same time, it is understandable that the data involved in this technical solution (including but not limited to the data itself, the acquisition or use of the data) must comply with the requirements of relevant laws, regulations and relevant provisions.

[0037] In some embodiments, the OMSP protection method is implemented by placing an optical protection (OP) board between the combiner (MUX) / demultiplexer (DEMUX) and the optical amplifier (OP) board. The transmitting end of the OP protection board is a splitter, which sends the power of the main optical channel of the combined service to the two optical cable routes in a concurrent splitting manner, and then amplifies it by the booster amplifier (BA), line amplifier (LA), and receiving end pre-amplifier (PA) of the primary and backup routes, and reaches the OP protection board at the end. The receiving end of the end OP protection board uses an optical switch, which monitors the photoelectric detection power of the receiving end of the primary and backup routes and selects the route of the optical switch.

[0038] In traditional OMSP protection switching systems, an absolute power threshold Pt or a relative threshold ΔPt is typically set on the end-point OP protection board. In absolute power threshold mode, if the received optical power on either primary or backup route falls below Pt, the optical switch switches to the other route. In relative threshold mode, the relative powers of the primary and backup routes are compared. When the absolute power difference between the primary and backup routes exceeds ΔPt, the optical switch switches to the higher-power route.

[0039] In the traditional OMSP protection mode, the main optical power (including all service optical channels) is monitored and switched. In the traditional OMSP protection mode, whether it is a single-span metropolitan area network or a multi-span long-haul network, the OP protection board configuration method is the same.

[0040] Furthermore, the automatic line shutdown (ALS) function of traditional erbium-doped fiber amplifiers (EDFAs) is triggered by a loss of light (LOS) alarm at the amplifier input or the optical supervisory channel (OSC) input on the optical amplifier card. When the received optical power at the amplifier input falls below a threshold, an alarm is reported to the main control card, which then shuts down the amplifier, typically by disabling the amplifier's pump. This method requires the main control card to be involved, so if the optical cable is disconnected or the main control card fails, the ALS will not be triggered.

[0041] In addition, some manufacturers' ALS automatic shutdown is not determined and triggered by the network element itself, but by a centralized controller that determines and issues the ALS command to the network element. If the management network is interrupted when the optical cable failure occurs or recovers, the ALS cannot be triggered or recovered.

[0042] Moreover, the aforementioned LOS threshold value of the amplifier is usually hard-coded by the manufacturer at the factory, and is set based on factors such as saturated output power, minimum number of channels (i.e., 1 channel), maximum amplifier gain, and reserved margin. Furthermore, the LOS threshold values ​​for different optical amplifier models are not uniform. This LOS threshold value is usually a very low value. For example, for a C96 band amplifier with a gain range of 15-25dB and a saturated output of 22dBm, the LOS threshold value may be -35 to -40dBm. In a low-wavelength scenario, if the amplifier's received optical power does not fall below the LOS threshold value due to line degradation, the ALS cannot be triggered. Therefore, it is possible that the line degradation is not low enough to trigger the ALS, and the OP board does not perform switching due to cascading, but the optical signal-to-noise ratio (OSNR) performance at the end is already insufficient.

[0043] Traditional OMSP protection employs a universal configuration, regardless of the number of service optical channels loaded in the optical transmission system—for example, a full-wavelength system with 96 C-band channels or a system with only 1 or 2 channels. This configuration relies on power monitoring at the receiving end of the OP protection board for triggering. When the optical transmission system has only a few service optical channels (for example, fewer than 5 channels), switching failures may occur. This is briefly analyzed below.

[0044] The output noise of EDFA can be calculated by the following formula:

[0045] Among them, P ASE is the output noise of the amplifier; G is the target gain of the amplifier; h is Planck's constant (h = 6.626e-34 J·s); v is the optical channel frequency (for example, the C96 band is 196~191.2 THz); B is the noise equivalent bandwidth, usually 12.5 GHz; NF is the noise factor; P sSE is the Gaussian noise of the input amplifier at the noise equivalent bandwidth. ASE It consists of two parts: the Gaussian white noise introduced by the amplifier at this stage (that is, The Gaussian white noise accumulated by the pre-amplifier (i.e., G·P SSE ).

[0046] There are two concepts about amplifier gain. One is target gain and the other is actual gain. linear It is the amplification factor of the single-channel signal power, which is the power compensation of the signal light expected by the system. The target gain is also the signal gain, and the target gain is applicable to a single channel. Target Gain dB =10·lg(target gain linear )

[0047] Among them, the target gain dB is the target gain in dB, P SIGNAL-OUT is the total output power of the signal in the entire band, P SIGNAL-IN is the total input power of the signal in the entire band, G SIGNAL is the signal gain.

[0048] Actual Gain Actual Gain linear The calculation is the total output power and input power ratio of the entire band (for example, the C96 band 196 ~ 191.2THz). For the C band, it includes all signal power and the 4.8T noise power of the entire C band. In the following formula, P NOISE-OUT is the output noise power, P NOISE-IN is the input noise power, G SIGNAL+NOISE Indicates the gain obtained by taking into account noise and signal. The actual gain dB is the actual gain in dB. Actual gain dB =10·lg(actual gain linear ) Gain difference ΔG dB = Actual gain dB -Target Gain dB (3)

[0049] When the optical cable degrades, the power P entering the amplifier of the nth optical channel SIGNAL-IN and P SSE At the same time, the noise introduced by the amplifier at this stage is reduced. In fact, it does not change. When input P SIGNAL-IN and P SSE The lower the P ASE middle The larger the proportion of ASE / P SSE Therefore, for a single optical channel, the actual gain will increase, and the actual gain > target gain.

[0050] For the scenario with few waves (for example, only 1 to 2 waves), the P in Formula 2 is used for the actual gain calculation. SIGNAL-OUT is the total signal power of 1 to 2 waves, and P NOISE-OUT is the total noise power of the entire band (for example, the 4.8 THz range of the C96 band), so the gain difference ΔG in the low-wave scenario will be significantly greater than the gain difference ΔG in the full-wave scenario.

[0051] A large gain difference ΔG will cause the amplifier output power drop value of the degradation section to be smaller than the input drop value (the amplifier input drop value is the attenuation (Att), and the amplifier output power drop value is Att-ΔG). This phenomenon is more obvious when there are multiple spans. The actual drop value of the output power of the Nth level amplifier subsequent to the degradation section is Att-ΔG1-ΔG2-...-ΔG n . Therefore, the received optical power drop entering the receiving end of the OP board will be much lower than Att. Figure 1 shows the change in amplifier output (OUT) power of a certain manufacturer's EDFA after degradation in a single-wavelength, single-span segment, and different span losses. Figure 2 shows the change in amplifier output (OUT) power of a certain manufacturer's EDFA after degradation in a single-wavelength, single-span segment with a span loss of 20dB, and in 1, 2, 4, and 8 service channel scenarios. In general, in a low-wavelength scenario, when the line is degraded, the power drop value of the receiving end amplifier is inconsistent with the line degradation drop value, and there is the following rule:

[0052] ——The fewer the waves, the more obvious the inconsistency;

[0053] The lower the single-wavelength input optical power, the more obvious the inconsistency.

[0054] ——The more spans there are, the more obvious the inconsistency is (due to the multiple spans ΔG1, ΔG2, ... ΔG n accumulation of );

[0055] The larger the noise figure (NF) of the optical amplifier, the more obvious the inconsistency.

[0056] Therefore, in low-wavelength scenarios, no matter how the line degrades (or even breaks), the power drop entering the OP section is very limited (the noise of each optical amplifier cannot be eliminated). Therefore, in low-wavelength scenarios, traditional OMSP methods are prone to switching failure.

[0057] FIG3 is a flow chart of a switching method for redundant protection of an optical transmission system according to an embodiment of the present disclosure. The optical transmission system includes a primary optical channel and a backup optical channel. As shown in FIG3 , the switching method according to an embodiment of the present disclosure includes the following steps S31 to S34.

[0058] In step S31, the received optical power of the amplifier in the optical channel currently transmitting the optical signal in the main optical channel and the backup optical channel is obtained.

[0059] In some embodiments, some optical signals may be branched off from an optical channel currently transmitting optical signals, and a photodetector may be used to perform photoelectric detection on the branched optical signals to obtain the received optical power of the amplifier in the optical channel currently transmitting optical signals.

[0060] In step S32, the received optical power is compared with a threshold value, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span where the amplifier is located.

[0061] In some embodiments, the threshold value may be set to the base value minus the relative threshold value.

[0062] In some embodiments, the reference value is the amplifier input power set when the optical transmission system is commissioned. For example, the reference value should be set based on the number of channels in the optical transmission system and the actual number of service channels and span loss in the optical transmission system. This ensures that in low-bandwidth scenarios, even if the total received optical power of the amplifier (e.g., EDFA) is low, the ALS can still be triggered by the relative threshold. This allows for independent setting of the corresponding reference value for each span.

[0063] In some embodiments, the fiber characteristics may include at least one of the following: optical signal-to-noise ratio margin, fiber jitter characteristics. Since the relative threshold is associated with the fiber characteristics of the span where the amplifier is located, the corresponding relative threshold can be independently set for each span.

[0064] In some embodiments, the reference value and relative threshold value can be written into the main control board when the optical transmission system is turned on (applicable to scenarios where the main control board participates in ALS shutdown and inter-board communication); or a memory can be set in the optical amplifier board, and the reference value and relative threshold value can be written into the memory in the optical amplifier board (applicable to scenarios where communication only occurs within the optical amplifier board).

[0065] In step S33, if the received light power is lower than the threshold value, the light output of the amplifier is turned off.

[0066] In some embodiments, if the received light power is higher than a threshold value, the amplifier continues to output light.

[0067] In some embodiments, in order to avoid misjudgment, the light output of the amplifier may be turned off only when it is determined that the received light power is lower than a threshold value for N consecutive times.

[0068] In step S34, in response to turning off the light output of the amplifier, the transmission of the optical signal is switched to an optical channel that is not currently transmitting an optical signal among the main optical channel and the backup optical channel.

[0069] By adopting the above technical solution, the amplifier's received optical power can be compared with a threshold value. The threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the fiber characteristics of the span in which the amplifier is located. If the received optical power falls below the threshold value, the amplifier's light output is shut down. In response to the shutting down of the amplifier's light output, the transmission of the optical signal is switched to an optical channel, one of the main and backup optical channels, that is, one that is not currently transmitting an optical signal. Therefore, by adopting a relative threshold value associated with the fiber characteristics of the span, the threshold value can be set based on the fiber characteristics of the span in which the amplifier is located. That is, each span is set with an independent reference power based on the actual attenuation of the fiber, and the relative threshold value can also be set independently. This ensures that the ALS is effectively triggered, thereby ensuring effective switching and avoiding switching failures. Moreover, for spans with large attenuation that have the most significant impact on the OSNR performance of the optical transmission system, the relative threshold value can be set to a smaller value, making the ALS of that span more sensitive. The switching method according to the embodiment of the present disclosure is applicable to all redundant protection scenarios (e.g., OMSP scenarios) of point-to-point networking of optical transmission systems, such as single-span metropolitan area, multi-span metropolitan area, multi-span long-haul area, pure C-band, C+L-band, full-band scenarios, and low-band scenarios, and is particularly applicable to low-band scenarios. Typically, in the early stages of an optical transmission system's commissioning, when service bandwidth requirements are low and there are few channels, the switching method according to the embodiment of the present disclosure can solve the problem of optical cable degradation failing to trigger OP switching in low-band scenarios.

[0070] Figure 4 shows a schematic diagram of switching of an optical transmission system according to an embodiment of the present disclosure. In Figure 4, OUT represents an optical conversion unit.

[0071] For the optical transmission system shown in Figure 4, if the traditional amplifier ALS shutdown function is used (that is, the manufacturer provides a fixed LOS threshold value, and the threshold value varies for different optical amplifier models), the degradation of the optical cable is unpredictable. Therefore, in the low-wave scenario, the total noise power (P noise ) in the total power (P signal +P noise ) accounts for a large proportion, and the output power drop value ΔP of the first-stage optical amplifier following the degradation span LA1 <Optical cable degradation value A span1 ; The output power drop value of subsequent optical amplifier ΔP LA2 <ΔP LA1 Similarly, ΔP PA1 <ΔP LA2 <ΔP LA1 Therefore, the power drop value ΔP to the input of the OP card is R1 Already much smaller than ΔP LA1 . ΔP may appear R1 The OP board switching threshold has not been reached, but A span1The signal optical OSNR has reached an unusable state. In other words, in low-wavelength scenarios, the cascaded optical amplifier signal will cause the optical amplifier power to drop gradually from span to span, eventually leading to switching failure.

[0072] In contrast, the embodiment of the present disclosure triggers ALS based on a threshold value associated with a reference value and a relative threshold value. That is, for an end-to-end line from end A to end Z, if the optical cable between end A and the main routing relay station 1 is interrupted (indicated by "×" in FIG4 ) or degrades below the ALS threshold value (that is, "reference value minus relative threshold value"), the amplifier LA1 of the main routing relay station 1 will be triggered to perform ALS shutdown (indicated by "×" in FIG4 ); thus, the downstream LA2 will also receive no light, thereby triggering LA2 to perform ALS shutdown; similarly, the Z-end PA1 will also trigger ALS; therefore, ultimately at the Z-end OP board main routing R1 will receive no light, thereby triggering OP to switch to the backup routing; the main routing becomes unavailable. That is, the present disclosure utilizes ALS cascading to trigger OP switching. Similarly, when the optical cable from BA1 to LA1 is restored and meets the preset recovery conditions (the preset recovery conditions will be described below), LA1 performs ALS recovery and the laser is turned back on; then the downstream LA2 performs ALS recovery and the laser is turned back on; similarly, PA1 is also turned back on; the main router R1 of the OP board at the Z end receives light, and the main router is restored to an available state.

[0073] Therefore, in the present disclosure, as long as any span meets the degraded ALS condition (i.e., triggering the ALS), the ALS of that span will not emit light, which will trigger the downstream ALS. In other words, the ALS mode can ensure that all optical amplifiers downstream of the degraded section are shut down one after another, so that the OP board card has no light and triggers switching. There will be no switching failure caused by the power drop decreasing due to the cascading of multiple spans in the low-wave scenario. In other words, the present disclosure can ensure effective switching in the low-wave scenario with multiple spans cascaded, and there will be no power drop decreasing from span to span, which will cause switching failure.

[0074] In some embodiments, an optical switch or optical shutter is provided at the output of the amplifier. Shutting down the amplifier's light output in step S33 can be accomplished by shutting down the optical switch or optical shutter at the amplifier's output. In some embodiments, shutting down the amplifier's light output by shutting down the amplifier's pump typically takes hundreds of milliseconds. However, the shut-down method according to the present disclosure typically takes only a few milliseconds, enabling faster shut-down of the amplifier's light output and, consequently, faster shut-down of the light output of the optical channel currently transmitting the optical signal.

[0075] Figure 5 is a flowchart of ALS recovery according to an embodiment of the present disclosure. This ALS recovery process is applicable to restoring the output light of an amplifier after an optical cable line fault in an optical transmission system has been repaired. This recovery process is actually a switching process. As shown in Figure 5, the ALS recovery process includes the following steps S51 to S52.

[0076] In step S51 , the received optical power of the amplifier, the received optical power of the optical supervisory channel in the optical transmission system, and whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself are detected.

[0077] In some embodiments, detecting whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself can be achieved in the following manner.

[0078] First, in step S511, a low-frequency modulated signal is demodulated from the optical signal transmitted to the amplifier. The low-frequency modulated signal carries the optical transmission system ID information. For example, the optical signal transmitted to the amplifier can be split, the split signal obtained can be photoelectrically converted, and the photoelectrically converted signal can be A / D converted to thereby demodulate the low-frequency modulated signal.

[0079] The low-frequency modulation signal can be a low-frequency top-modulated signal. FIG6 shows a schematic diagram of a low-frequency top-modulated signal according to an embodiment of the present disclosure. In the figure, the sinusoidal signal between two horizontal dashed lines is the low-frequency top-modulated signal, and the signal below the sinusoidal signal is the optical amplification service signal.

[0080] The optical transmission system ID information can use the frame format shown in Figure 7, which may include fields such as a frame header tag (e.g., 01010101-01010101), a frame length (Frame Length), a vendor ID (Vendor ID), and an optical transmission system ID (e.g., an optical transmission system ID value or a description of the optical transmission system). The length of each field can be set as needed. For example, the frame header tag field can be 2 bytes long, the frame length field can be 2 bytes long, the vendor ID field can be 2 bytes long, and the optical transmission system ID field can be equal to the frame length minus 6 bytes. With this frame format, even if multiple optical transmission systems from the same equipment manufacturer exist in the same span, they can still be distinguished and identified using the optical transmission system ID field.

[0081] The optical transmission system ID information can be modulated onto the optical amplifier service signal in the following manner: The optical transmission system ID information is digitally encoded, using a NRZ encoding method, for example; the encoded information is then converted into a low-frequency analog signal through D / A modulation, using frequency modulation or phase modulation (e.g., PSK modulation); the low-frequency analog signal is then connected to the amplifier's pump bias circuit to modulate the pump power, thereby changing the optical amplifier gain and achieving low-frequency modulation of the main optical power signal of the optical amplifier, thereby modulating the optical transmission system ID information onto the optical amplifier service signal. This low-frequency modulation of the main optical power signal of the optical amplifier can be achieved using a top-modulation method with a small modulation depth (e.g., 0.5-1 dB), ensuring that service channel performance is largely unaffected.

[0082] Then, in step S512, after the low-frequency modulation signal is demodulated, the low-frequency modulation signal is analyzed to obtain the optical transmission system ID information.

[0083] Then, in step S513, the parsed optical transmission system ID information is compared with the optical transmission system's own ID information to determine whether the optical signal transmitted to the amplifier is the optical transmission system's own optical signal. If the parsed optical transmission system ID information matches the optical transmission system's own ID information, the received optical signal is considered to be a signal from the same manufacturer's optical amplifier. If the parsed optical transmission system ID information does not match the optical transmission system's own ID information, or if the optical transmission system ID signal cannot be parsed, the received optical signal is considered to be a signal from a different manufacturer's optical amplifier.

[0084] By detecting whether the optical signal transmitted to the amplifier is the optical transmission system's own optical signal, it is possible to avoid the problem of optical signals from other optical transmission systems being mistakenly connected due to mis-melting or mis-connecting of fiber cores during optical cable troubleshooting. For example, Site A and Site B both have equipment from System A and System B; System A uses 1 / 2 cores, and System B uses 3 / 4 cores. If the optical cable between end A and end Z is broken, repair personnel may fuse the 1 / 2 core in the A direction and the 3 / 4 core in the Z direction together at the breakpoint, and then fuse the 3 / 4 core in the A direction and the 1 / 2 core in the Z direction together. In this way, Systems A and B will transmit and receive signals to each other, and the board power is normal, but communication is impossible. However, the detection method according to the embodiment of the present disclosure can detect that the optical signal transmitted to the amplifier is not the optical transmission system's own optical signal. In addition, the optical transmission system ID information identification method according to the embodiment of the present disclosure is achieved by generating the optical transmission system ID signal through low-frequency modulation within the optical amplifier board. This is independent of the electrical layer board and OSC communication, and can operate in hybrid optical-to-electrical decoupling networking scenarios of different manufacturers. The identification of optical transmission system ID information does not require communication between main control boards of network elements or the participation of controllers. Low-frequency modulation signals are generated / terminated span by span without affecting the electrical layer service channel signals.

[0085] In step S52, if it is detected that the received optical power of the amplifier is greater than the threshold value, the received optical power of the optical supervisory channel is greater than the preset threshold value, and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself, the light output of the amplifier is restored.

[0086] In some embodiments, in order to avoid misjudgment, the received light power of the amplifier may be considered to be greater than the threshold value only when the received light power of the amplifier is detected to be greater than the threshold value N times in a row.

[0087] In some embodiments, to avoid misjudgment, the received optical power of the optical supervisory channel may be considered to be greater than the preset threshold only when the received optical power of the optical supervisory channel is detected to be greater than the preset threshold N times in a row.

[0088] In some embodiments, the amplifier's light output can be restored by reopening an optical switch at the amplifier's output. In the present disclosure, the amplifier's light output is restored by opening the optical switch at the amplifier's output and shut off by shutting it off, rather than by turning the amplifier's pump on or off. This allows for faster restoration and shutoff of the amplifier's light output.

[0089] By adopting the above technical solution, the amplifier's light output will be restored only when it is detected that the amplifier's received light power is greater than the threshold value, the optical monitoring channel's received light power is greater than the preset threshold value, and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself. Therefore, even if the optical fiber is mis-fused or mis-connected when the optical cable service provider repairs the optical cable fault, and external strong light enters the amplifier's received light, the amplifier's light output will not be restored, and the end OP board will not receive strong light. Therefore, there will be no erroneous switching caused by, for example, third-party optical amplifier signals or optical time domain reflectometer (OTDR) optical access during optical cable repair, and ALS erroneous recovery caused by mis-fusion or mis-connection of the fiber core can be avoided.

[0090] In some embodiments, the switching method according to the embodiment of the present disclosure may further include: controlling the light output of the amplifier by a processor located in the same board as the amplifier, where the controller may be, for example, a microcontroller unit (MCU) or a field programmable gate array (FPGA). For example, the processor controls the optical switch located at the output end of the amplifier to turn off, thereby turning off the light output of the amplifier, and the processor controls the optical switch located at the output end of the amplifier to turn on, thereby restoring the light output of the amplifier. In this way, there is no need to go through the main control board, thereby improving the speed of shutdown and recovery. Moreover, since the main control board does not need to be involved in shutdown and recovery, ALS shutdown and ALS recovery can still be achieved in the event of network element disconnection or main control failure.

[0091] Figure 8 is a schematic block diagram of an optical amplifier board according to an embodiment of the present disclosure. As shown in Figure 8, the optical amplifier board includes: a first detection module 81 for detecting the received optical power of the amplifier in the main and backup optical channels of the optical transmission system, and in the optical channel currently transmitting an optical signal; and a processor 82 for comparing the received optical power with a threshold value. If the received optical power is lower than the threshold value, the amplifier's optical output is shut off. The threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the fiber characteristics of the span in which the amplifier is located.

[0092] By adopting the above technical solution, since the received optical power of the amplifier can be compared with the threshold value, the threshold value is associated with the reference value and the relative threshold value, and the relative threshold value is associated with the fiber characteristics of the span in which the amplifier is located, then if the received optical power is lower than the threshold value, the light output of the amplifier is shut down. Therefore, by adopting the relative threshold value associated with the fiber characteristics of the span, the threshold value can be set according to the fiber characteristics of the span in which the amplifier is located, that is, each span is set with an independent reference power according to the actual attenuation of the fiber, and the relative threshold value can also be set independently, so that the ALS can be effectively triggered, thereby ensuring effective switching and avoiding switching failure. Moreover, for the span with large attenuation and the most significant impact on the OSNR performance of the optical transmission system, the relative threshold value can be set to a smaller value, making the ALS of the span more sensitive. According to the embodiment of the present disclosure, the optical amplifier card is applicable to all redundant protection scenarios (such as OMSP scenarios) of point-to-point networking of optical transmission systems, such as single-span in metropolitan areas, multi-span in metropolitan areas, multi-span in long-haul areas, pure C band, C+L band, full-wave scenarios, and low-wave scenarios, and is particularly applicable to low-wave scenarios. Typically, in the early stages of an optical transmission system, when the service bandwidth demand is small and there are fewer channels, the use of an optical amplifier board according to an embodiment of the present disclosure can solve the problem that optical cable degradation cannot trigger OP switching in low-channel scenarios.

[0093] Figure 9 is another schematic block diagram of an optical amplifier card according to an embodiment of the present disclosure. As shown in Figure 9, the optical amplifier card also includes an optical switch 83. The processor 82 is further configured to shut off the output light of the amplifier by turning off the optical switch 83 if the received optical power is lower than a threshold value.

[0094] With further reference to FIG9 , the optical amplifier board also includes an identification module 84 and a second detection module 85 , wherein: the identification module 84 is used to identify whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself; the second detection module 85 is used to detect the received optical power of the optical monitoring channel in the optical transmission system; and the processor 82 is further used to restore the optical output of the amplifier after the optical cable line fault of the optical transmission system is restored, if it is detected that the received optical power of the amplifier is greater than a threshold value, the received optical power of the optical monitoring channel is greater than a preset threshold value, and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself.

[0095] Figure 10 is another schematic block diagram of an optical amplifier card according to an embodiment of the present disclosure. The amplifier card is suitable for deployment in a relay station of an optical transmission system. The optical amplifier card is bidirectionally amplified, with both ends connected to line optical cables.

[0096] As shown in Figure 10, the input port of the optical amplifier card features a splitter for the main optical channel and the OSC monitoring channel, separating the main optical channel spectrum from the OSC spectrum. A combiner is located at the output port of the optical amplifier card, combining the main optical channel and the OSC monitoring channel. Optical splitter taps and photodetectors (PDs) are provided at the amplifier's input (VGA-in) and output (VGA-out), as well as the OSC input (OSC-in) and output (OSC-out), for monitoring optical power. In Figure 10, the amplifier is schematically represented as a variable-gain amplifier (VGA), but those skilled in the art will appreciate that other types of amplifiers are also feasible.

[0097] The identification module in Figure 10 corresponds to the identification module 84 in Figure 9. In this identification module, the photoelectric converter is used to perform photoelectric conversion to obtain a full-frequency analog signal, the filter is used to filter the full-frequency analog signal to obtain a low-frequency analog signal, the A / D converter is used to convert the low-frequency analog signal into a digital signal, and the analysis module is used to analyze the digital signal to obtain the optical transmission system ID information.

[0098] An optional variable optical attenuator (VOA) is provided at the output end of the VGA to adjust the output signal of the VGA.

[0099] The output of the VOA is equipped with an optical switch. When the switch is open, it restores the VGA's light output; when the switch is closed, it shuts off the VGA's light output. The processor controls the opening and closing of the optical switch based on the logic described above, thereby controlling the amplifier's light output. The memory can store the threshold values ​​described above, the optical transmission system's own ID information, and other information.

[0100] This optical amplifier card implements the ALS shutdown and ALS restoration described above. For example, if the received optical power at the amplifier input VGA-in is less than the threshold, the processor controls the optical switch to shut down, thereby shutting off the amplifier's light output. After the optical cable fault is restored, if the received optical power at the amplifier input VGA-in is greater than the threshold, the received optical power of the OSC is greater than a preset threshold, and the identification module detects that the optical signal transmitted to the amplifier is the optical transmission system's own signal, the processor controls the optical switch to open, restoring the amplifier's light output.

[0101] Figure 11 is another schematic block diagram of an optical amplifier card according to an embodiment of the present disclosure. The optical amplifier card can be deployed at an end station of an optical transmission system. The optical amplifier card is bidirectionally amplified, with one end connected to a local terminal and the other end connected to a line optical cable.

[0102] The difference between the optical amplifier board at the end station in Figure 11 and the optical amplifier board at the relay station in Figure 10 is that a modulation module is provided in the direction of the transmitting amplifier in the end station to modulate the ID information of the optical transmission system onto the optical amplifier service signal. For example, the ID signal generation module in the modulation module can digitally encode the ID information of the optical transmission system, and the D / A converter in the modulation module can convert the encoded information into a low-frequency analog signal. This low-frequency analog signal is then connected to the bias circuit of the amplifier pump to achieve low-frequency modulation of the optical amplifier service signal, thereby modulating the ID information of the optical transmission system onto the optical amplifier service signal. The implementation method of modulation has been described in detail above and will not be repeated here.

[0103] In FIG11 , an identification module is provided in the receiving amplifier direction of the optical amplifier board at the terminal station for parsing the optical transmission system ID information in the optical signal. Its function is the same as that of the identification module in FIG10 and will not be repeated here.

[0104] Therefore, in a route of an optical transmission system, the optical transmission system ID signal is generated at the transmitting amplifier of the end station. The optical amplifier board in the downstream line relay station and the receiving optical amplifier board only parse the optical transmission system ID signal to determine whether the received optical signal is the optical amplifier signal of this manufacturer and this system. The optical amplifier board in each downstream relay station and the processor in the receiving optical amplifier board mark the system they are in. In this way, only when the parsed and received optical transmission system ID information is consistent with the ID information of the optical transmission system of this station itself, the optical switch will be opened and the ALS will be restored.

[0105] The present disclosure also provides an optical transmission system, comprising any optical amplifier board in the present disclosure.

[0106] The optical transmission system according to the embodiment of the present disclosure further includes a switching module for switching the transmission of the optical signal to an optical channel that is not currently transmitting an optical signal among the main optical channel and the backup optical channel in response to shutting down the output light of the amplifier.

[0107] The specific implementation manner in which each module in the optical transmission system and the optical amplifier board according to the embodiment of the present disclosure performs operations has been described in detail in the relevant methods and will not be repeated here.

[0108] The present disclosure also provides a computer-readable medium having a computer program stored thereon, which implements the steps of any method in the present disclosure when the program is executed by a processing device.

[0109] The present disclosure discloses an electronic device, comprising: a storage device storing at least one computer program; and at least one processing device configured to execute the at least one computer program in the storage device to implement the steps of any one of the methods disclosed herein.

[0110] Reference is now made to FIG12, which illustrates a schematic diagram of the structure of an electronic device 600 suitable for implementing embodiments of the present disclosure. Terminal devices in embodiments of the present disclosure may include, but are not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. The electronic device illustrated in FIG12 is merely an example and should not limit the functionality or scope of use of embodiments of the present disclosure.

[0111] As shown in Figure 12, the electronic device 600 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 into a random access memory (RAM) 603. Various programs and data required for the operation of the electronic device 600 are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0112] Typically, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 608 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 609. The communication device 609 may allow the electronic device 600 to communicate with other devices wirelessly or by wire to exchange data. Although FIG12 shows the electronic device 600 with various devices, it should be understood that it is not required to implement or have all of the devices shown. More or fewer devices may be implemented or have alternatively.

[0113] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 609, or installed from the storage device 608, or installed from the ROM 602. When the computer program is executed by the processing device 601, the above-mentioned functions defined in the method of the embodiment of the present disclosure are performed.

[0114] It should be noted that the computer-readable medium mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or component. In the present disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof.

[0115] In some embodiments, the client and server can communicate using any currently known or later developed network protocol, such as HTTP (HyperText Transfer Protocol), and can be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or later developed network.

[0116] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0117] The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device is caused to: obtain the received optical power of the amplifier in the main optical channel and the backup optical channel that is currently transmitting the optical signal; compare the received optical power with a threshold value, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span in which the amplifier is located; if the received optical power is lower than the threshold value, shut off the light output of the amplifier; in response to shutting off the light output of the amplifier, switch the transmission of the optical signal to the optical channel in the main optical channel and the backup optical channel that is not currently transmitting the optical signal.

[0118] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including, but not limited to, object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0119] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0120] The modules described in the embodiments of the present disclosure may be implemented via software or hardware. In some cases, the name of a module does not limit the module itself. For example, the first detection module may also be described as "a module for detecting the received optical power of an amplifier in a main optical channel and a backup optical channel of an optical transmission system, which is currently transmitting an optical signal."

[0121] The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, and without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0122] In the context of the present disclosure, a machine-readable medium can be a tangible medium that can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0123] According to one or more embodiments of the present disclosure, Example 1 provides a switching method for redundant protection of an optical transmission system, wherein the optical transmission system includes a main optical channel and a backup optical channel, and the switching method includes: obtaining the received optical power of the amplifier in the optical channel that is currently transmitting the optical signal in the main optical channel and the backup optical channel; comparing the received optical power with a threshold value, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span in which the amplifier is located; if the received optical power is lower than the threshold value, shutting off the light output of the amplifier; in response to shutting off the light output of the amplifier, switching the transmission of the optical signal to the optical channel that is currently not transmitting the optical signal in the main optical channel and the backup optical channel.

[0124] According to one or more embodiments of the present disclosure, Example 2 provides the switching method of Example 1, wherein the reference value is the input power of the amplifier set when the optical transmission system is turned on.

[0125] According to one or more embodiments of the present disclosure, Example 3 provides the switching method of Example 1, wherein the fiber characteristic includes at least one of the following: optical signal-to-noise ratio margin, and fiber jitter characteristics.

[0126] According to one or more embodiments of the present disclosure, Example 4 provides the switching method of Example 1, wherein shutting off the light output of the amplifier includes shutting off the light output of the amplifier by shutting off an optical switch located at the output end of the amplifier.

[0127] According to one or more embodiments of the present disclosure, Example 5 provides the switching method of Example 1, wherein, after the optical cable line fault of the optical transmission system is restored, the switching method further includes: detecting the received optical power of the amplifier, the received optical power of the optical monitoring channel in the optical transmission system, and whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself; if it is detected that the received optical power of the amplifier is greater than the threshold value, the received optical power of the optical monitoring channel is greater than the preset threshold value and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself, then restoring the light output of the amplifier.

[0128] According to one or more embodiments of the present disclosure, Example 6 provides the switching method of Example 5, wherein the detecting whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself includes: demodulating a low-frequency modulated signal from the optical signal transmitted to the amplifier, the low-frequency modulated signal carrying optical transmission system ID information; parsing the low-frequency modulated signal to obtain the optical transmission system ID information; and comparing the optical transmission system ID information with the ID information of the optical transmission system itself to determine whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself.

[0129] According to one or more embodiments of the present disclosure, Example 7 provides the switching method of Example 1, wherein the optical transmission system ID information includes a frame header tag field, a frame length field, a vendor ID field, and an optical transmission system ID field.

[0130] According to one or more embodiments of the present disclosure, Example 8 provides the switching method of any one of Examples 1 to 7, wherein the switching method further includes: controlling the light output of the amplifier by a processor located in the same board as the amplifier.

[0131] According to one or more embodiments of the present disclosure, Example 9 provides an optical amplifier board, comprising: a first detection module, used to detect the received light power of the amplifier in the main optical channel and the backup optical channel of the optical transmission system, and in the optical channel currently transmitting the optical signal; a processor, used to compare the received light power with a threshold value, and if the received light power is lower than the threshold value, shutting off the light output of the amplifier, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span in which the amplifier is located.

[0132] According to one or more embodiments of the present disclosure, Example 10 provides the optical amplifier board of Example 9, wherein the optical amplifier board also includes an optical switch; and the processor is further configured to shut off the output light of the amplifier by turning off the optical switch if the received light power is lower than the threshold value.

[0133] According to one or more embodiments of the present disclosure, Example 11 provides the optical amplifier board of Example 9, wherein the optical amplifier board also includes an identification module and a second detection module, wherein: the identification module is used to identify whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself; the second detection module is used to detect the received optical power of the optical monitoring channel in the optical transmission system; the processor is also used to restore the optical output of the amplifier after the optical cable line fault of the optical transmission system is restored, if it is detected that the received optical power of the amplifier is greater than the threshold value, the received optical power of the optical monitoring channel is greater than the preset threshold value, and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself.

[0134] According to one or more embodiments of the present disclosure, Example 12 provides an optical transmission system comprising the optical amplifier board of any one of Examples 9 to 11.

[0135] According to one or more embodiments of the present disclosure, Example 13 provides the optical transmission system of Example 12, wherein the optical transmission system further includes a switching module for switching the transmission of the optical signal to an optical channel between the main optical channel and the backup optical channel that is not currently transmitting the optical signal in response to shutting off the light output of the amplifier.

[0136] According to one or more embodiments of the present disclosure, Example 14 provides a computer-readable medium having a computer program stored thereon, which implements the steps of the method described in any one of Examples 1-8 when executed by a processing device.

[0137] According to one or more embodiments of the present disclosure, Example 15 provides an electronic device, comprising: a storage device on which at least one computer program is stored; and at least one processing device for executing the at least one computer program in the storage device to implement the steps of the method described in any one of Examples 1-8.

[0138] The above description is merely a preferred embodiment of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this disclosure.

[0139] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details have been included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0140] Although the subject matter has been described using language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims. Regarding the apparatus in the above-described embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method and will not be elaborated upon here.

Claims

1. A switching method for redundant protection of an optical transmission system, wherein the optical transmission system comprises a main optical channel and a backup optical channel, wherein: The switching method comprises: Acquire the received optical power of the amplifier in the optical channel currently transmitting the optical signal in the main optical channel and the standby optical channel; Comparing the received optical power with a threshold value, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristic of the span where the amplifier is located; If the received light power is lower than the threshold value, shutting down the light output of the amplifier; In response to shutting off the light output of the amplifier, the transmission of the optical signal is switched to an optical channel that is not currently transmitting the optical signal among the main optical channel and the backup optical channel.

2. The switching method according to claim 1, wherein: The reference value is the input power of the amplifier set when the optical transmission system is turned on.

3. The switching method according to claim 1 or 2, wherein: The optical fiber characteristic includes at least one of the following: optical signal-to-noise ratio margin, optical fiber jitter characteristics.

4. The switching method according to any one of claims 1 to 3, wherein: The step of shutting off the light output of the amplifier comprises: The light output of the amplifier is turned off by turning off the optical switch located at the output end of the amplifier.

5. The switching method according to any one of claims 1 to 4, wherein: After the optical cable line fault of the optical transmission system is restored, the switching method further comprises: Detecting the received optical power of the amplifier, the received optical power of the optical monitoring channel in the optical transmission system, and whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself; If it is detected that the received optical power of the amplifier is greater than the threshold value, the received optical power of the optical monitoring channel is greater than a preset threshold value, and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself, the light output of the amplifier is restored.

6. The switching method according to claim 5, wherein: The detecting whether the optical signal transmitted to the amplifier is an optical signal of the optical transmission system itself comprises: demodulating a low-frequency modulation signal from the optical signal transmitted to the amplifier, wherein the low-frequency modulation signal carries the optical transmission system ID information; Parsing the low-frequency modulation signal to obtain the optical transmission system ID information; The optical transmission system ID information is compared with the ID information of the optical transmission system itself to determine whether the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself.

7. The switching method according to claim 6, wherein: The optical transmission system ID information includes a frame header tag field, a frame length field, a manufacturer ID field, and an optical transmission system ID field.

8. The switching method according to any one of claims 1 to 7, further comprising: The light output of the amplifier is controlled by a processor located in the same board as the amplifier.

9. An optical amplifier board, comprising: A first detection module is configured to detect the received optical power of the amplifier in the main optical channel and the standby optical channel of the optical transmission system and in the optical channel currently transmitting the optical signal; The processor is configured to compare the received light power with a threshold value, and if the received light power is lower than the threshold value, shut down the light output of the amplifier, wherein the threshold value is associated with a reference value and a relative threshold value, and the relative threshold value is associated with the optical fiber characteristics of the span where the amplifier is located.

10. The optical amplifier card according to claim 9, wherein: The optical amplifier board also includes an optical switch; The processor is further configured to shut off the light output of the amplifier by turning off the optical switch if the received light power is lower than the threshold value.

11. The optical amplifier card according to claim 9 or 10, wherein: The optical amplifier board also includes an identification module and a second detection module, wherein: The identification module is configured to identify whether the optical signal transmitted to the amplifier is an optical signal of the optical transmission system itself; The second detection module is configured to detect the received optical power of the optical monitoring channel in the optical transmission system; The processor is further configured to restore the light output of the amplifier after the optical cable line fault of the optical transmission system is restored, if it is detected that the received light power of the amplifier is greater than the threshold value, the received light power of the optical monitoring channel is greater than a preset threshold value, and the optical signal transmitted to the amplifier is the optical signal of the optical transmission system itself.

12. An optical transmission system, comprising the optical amplifier board according to any one of claims 9 to 11.

13. The optical transmission system according to claim 12, wherein: The optical transmission system further includes a switching module configured to switch the transmission of the optical signal to an optical channel that is not currently transmitting the optical signal between the main optical channel and the backup optical channel in response to shutting off the light output of the amplifier.

14. A computer readable medium having a computer program stored thereon, wherein: When the program is executed by a processing device, the steps of the method according to any one of claims 1 to 8 are implemented.

15. An electronic device, comprising: a storage device having at least one computer program stored thereon; At least one processing device is configured to execute the at least one computer program in the storage device to implement the steps of the method according to any one of claims 1 to 8.

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