N-transmitting n-receiving optical multiplexing segment, optical channel, subnet connection protection system and related method

Abstract

The embodiment of the invention provides an n-transmitting and n-receiving optical multiplexing segment protection system, an optical channel protection system, a subnet connection protection system and related methods. Priority classification is carried out on optical signals for an n-transmitting and n-receiving optical transmission system, on one hand, under the condition that n optical cables are normal optical cables, n paths of optical signals with different priorities are transmitted through the n optical cables, bandwidth resources of the optical cables cannot be wasted, and the resource utilization rate of the optical transmission system is improved; on the other hand, under the condition that the faulted optical cable exists in the n optical cables, if the priority of the optical signal transmitted before the faulted optical cable breaks down is higher than the priority of the optical signal transmitted by the normal optical cable, the optical signal transmitted before the faulted optical cable breaks down is transmitted by the normal optical cable through protection switching; in other words, the normal optical cable for transmitting the optical signal with the low priority is preempted to transmit the optical signal with the high priority transmitted by the fault optical cable, so that the optical signal with the high priority is effectively protected, and the reliability of the optical transmission system is ensured.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an n-transmit-n-receive optical multiplexing section, an optical channel, a subnet connection protection system and related methods. Background Art

[0002] With the development of cloud computing, dense wavelength division multiplexing (DWDM) optical transmission systems, with their high-capacity communication capabilities, have been widely used in data center networks. As transmission capacity continues to increase, the reliability of optical transmission systems is also becoming increasingly important.

[0003] Currently, the optical transmission system for Optical Multiplex Section Protection (OMSP) uses a dual-transmit selective reception method for protection. This means that the OMSP system's transmitter simultaneously sends two identical optical signals, which are then transmitted via two different optical cables (a primary optical cable and a backup optical cable). Under normal circumstances, the OMSP system's receiver receives the optical signal transmitted from the primary optical cable. When the primary optical cable fails, the OMSP system's receiver receives the optical signal transmitted from the backup optical cable, thereby providing protection and ensuring the reliability of the OMSP system. However, this dual-transmit selective reception method wastes the bandwidth resources of one optical cable, doubling the bandwidth transmission cost of the entire OMSP system. Summary of the Invention

[0004] Various aspects of the present application provide an n-transmit-n-receive optical multiplex section protection system, an optical channel protection system, a subnet connection protection system, and related methods to improve resource utilization and reliability of an optical transmission system.

[0005] The embodiment of the present application provides an n-transmit, n-receive optical multiplex section protection system, comprising: a first device and a second device; the first device and the second device both comprise a plurality of optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the optical transceiver is connected to the input port of the first optical switch via the combiner, and the output port of the second optical switch is connected to the optical transceiver via the demultiplexer; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables, and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; one of the first device and the second device is a transmitting end, and the other is a receiving end; the transmitting end is used to transmit a plurality of optical signals to the optical switch via the first optical cable; An optical transceiver receives multiple optical signals of different priorities, combines the multiple optical signals of different priorities into n optical signals of different priorities through n combiners, and transmits the n optical signals of different priorities to n optical cables through a first optical switch in a transmitting end. The receiving end is configured to receive n optical signals from the n optical cables through a second optical switch in the receiving end, split the n optical signals of different priorities into multiple optical signals through n splitters, and output the multiple optical signals through multiple optical transceivers. Fault detection is performed on the n optical cables. If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end and the second optical switch in the receiving end are controlled to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0006] An embodiment of the present application further provides an n-transmit and n-receive optical channel protection system, comprising: a first device and a second device; the first device and the second device both comprise n optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the optical transceiver is connected to the input port of the first optical switch, and the output port of the second optical switch is connected to the optical transceiver; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables, and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; a combiner is further provided between the output port of the first optical switch in the first device and the first optical cable, and a demultiplexer is further provided between the first optical cable and the input port of the second optical switch in the second device; the output port of the first optical switch in the second device is connected to the n input ports of the second optical switch A combiner is further provided between the second optical cables, and a demultiplexer is further provided between the second optical cable and the input port of the second optical switch in the second device; one of the first device and the second device is a transmitting end, and the other is a receiving end; the transmitting end is used to receive n optical signals of different priorities through n optical transceivers, and to send the n optical signals of different priorities to n optical cables respectively through the first optical switch in the transmitting end and the n combiners; the receiving end is used to receive n optical signals from the n optical cables through the n demultiplexers and the second optical switch in the receiving end, and to output the n optical signals to the outside through the n optical transceivers; fault detection is performed on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end and the second optical switch in the receiving end are controlled to perform optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0007] An embodiment of the present application also provides an n-transmit and n-receive subnet connection protection system, comprising: a first device and a second device; the first device and the second device both comprise a switch, n combiners, n splitters, and an optical receiver, where n is a positive integer greater than 1, and the optical receiver comprises a client-side port and a line-side port; the switch and the client-side port of the optical receiver are connected, the n line-side first ports of the optical receiver in the first device are connected to the n line-side second ports of the optical receiver in the second device via n first optical cables, and the n line-side first ports of the optical receiver in the second device are connected to the n line-side second ports of the optical receiver in the first device via n second optical cables; one of the first and second devices comprises a first optical cable; and the second optical cable comprises a second optical cable. One is a transmitting end and the other is a receiving end; the transmitting end is used to receive n optical signals of different priorities through a switch, and send the n optical signals of different priorities to n optical cables respectively through an optical receiver in the transmitter and n combiners; the receiving end is used to receive n optical signals from n optical cables through n splitters and an optical receiver in the receiving end, and output the n optical signals to the outside through the switch; fault detection is performed on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the optical receiver in the transmitting end and the optical receiver in the receiving end are controlled to perform an electrical cross-link operation, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0008] An embodiment of the present application further provides an n-transmit and n-receive client-side protection optical transmission system, comprising: a first device and a second device; the first device and the second device both comprise n switches, n optical transceivers, n combiners, n wave splitters, n×n first optical switches, and n×n second optical switches, where n is a positive integer greater than 1; the switches are connected to the first optical switch and the second optical switch, respectively; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables; the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; the output ports of the first optical switch are connected to the optical cables via the optical transceiver and the wave splitter, and the optical cables are connected to the input ports of the second optical switch via the wave splitter and the optical transceiver; One of the first device and the second device is a transmitting end, and the other is a receiving end; the transmitting end is used to receive n optical signals of different priorities through a switch, and send the n optical signals of different priorities to n optical cables through a first optical switch, n optical transceivers, and n combiners in the transmitting end; the receiving end is used to receive n optical signals from n optical cables through n wave splitters, n optical receivers, and a second optical switch in the receiving end, and output the n optical signals to the outside through the switch; fault detection is performed on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end and the second optical switch in the receiving end are controlled to switch the optical paths so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0009] An embodiment of the present application also provides an optical signal transmission method, which is applied to a transmitting end. The method includes: receiving multiple optical signals of different priorities through multiple optical transceivers in the transmitting end, and combining the multiple optical signals of different priorities into n optical signals of different priorities through n combiners, and sending the n optical signals of different priorities to n optical cables respectively through a first optical switch in the transmitting end; in response to a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the first optical switch in the transmitting end to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0010] An embodiment of the present application also provides an optical signal transmission method, which is applied to a receiving end. The method includes: receiving n optical signals from n optical cables through a second optical switch in the receiving end, and dividing the n optical signals of different priorities into multiple optical signals through n splitters, and outputting the multiple optical signals to the outside through multiple optical transceivers; performing fault detection on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the second optical switch in the receiving end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0011] An embodiment of the present application also provides an optical signal transmission method, which is applied to a transmitting end. The method includes: receiving n optical signals of different priorities through n optical transceivers in the transmitting end, and sending the n optical signals of different priorities to n optical cables respectively through a first optical switch and n combiners in the transmitting end; in response to a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the first optical switch in the transmitting end to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0012] An embodiment of the present application also provides an optical signal transmission method, which is applied to a receiving end. The method includes: receiving n optical signals from n optical cables through n wave splitters and a second optical switch in the receiving end, and outputting the n optical signals to the outside through n optical transceivers; performing fault detection on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the second optical switch in the receiving end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0013] An embodiment of the present application also provides an optical signal transmission method, which is applied to a transmitting end. The method includes: receiving n optical signals of different priorities through a switch in the transmitter, and sending the n optical signals of different priorities to n optical cables respectively through an optical receiver and n combiners in the transmitter; in response to the occurrence of a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the optical receiver in the transmitting end to perform an electrical cross-operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0014] An embodiment of the present application also provides an optical signal transmission method, which is applied to a receiving end. The method includes: receiving n optical signals from n optical cables through n splitters and an optical receiver in the receiving end, and outputting the n optical signals to the outside through a switch; performing fault detection on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the optical receiver in the receiving end to perform an electrical cross-link operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0015] An embodiment of the present application also provides an optical signal transmission method, which is applied to a transmitting end. The method includes: receiving n optical signals of different priorities through a switch, and sending the n optical signals of different priorities to n optical cables respectively through a first optical switch, n optical transceivers, and n combiners in the transmitting end; in response to the occurrence of a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the first optical switch in the transmitting end to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0016] An embodiment of the present application also provides an optical signal transmission method, which is applied to a receiving end. The method includes: receiving n optical signals from n optical cables through n splitters, n optical receivers, and a second optical switch in the receiving end, and outputting the n optical signals to the outside through the switch; performing fault detection on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, controlling the second optical switch in the receiving end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0017] An embodiment of the present application also provides an embodiment of the present application also provides a computer device, including: a memory and a processor; the memory is used to store a computer program; the processor is coupled to the memory, and is used to execute the computer program to perform the steps in the above-mentioned optical signal transmission method.

[0018] An embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor is enabled to implement the steps in the above-mentioned optical signal transmission method.

[0019] An embodiment of the present application further provides a computer program product, including a computer program / instruction. When the computer program / instruction is executed by a processor, the processor is enabled to implement the steps in the above-mentioned optical signal transmission method.

[0020] The n-transmitter, n-receiver optical transmission system provided in the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, that is, under non-fault conditions, n optical signals of different priorities are transmitted through the n optical cables, thereby avoiding wasting the bandwidth resources of the optical cables, fully utilizing the bandwidth resources of the optical transmission system, and improving the resource utilization of the optical transmission system. On the other hand, when a faulty optical cable occurs among the n optical cables, that is, under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, protection switching is performed so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. In other words, the normal optical cable transmitting the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable, thereby effectively protecting the high-priority optical signal and ensuring the reliability of the optical transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is an architectural diagram of the existing optical multiplex section protection system;

[0023] Figure 2a An architecture diagram of an n-transmit n-receive optical multiplex section protection system provided in an embodiment of the present application;

[0024] Figure 2b An architecture diagram of another n-transmit n-receive optical multiplex section protection system provided in an embodiment of the present application;

[0025] Figure 2c Provided in the embodiments of this application Figure 2a The architecture diagram of the optical multiplex section protection system when a faulty optical cable occurs is shown;

[0026] Figure 3 This is an architectural diagram of the existing optical channel protection system;

[0027] Figure 4a This is an architecture diagram of an n-transmit n-receive optical channel protection system provided in an embodiment of the present application;

[0028] Figure 4b Provided in the embodiments of this application Figure 4a The architecture diagram of the optical channel protection system shown in FIG. 1 is a diagram showing a faulty optical cable;

[0029] Figure 4c This is an architecture diagram of another n-transmit n-receive optical channel protection system provided in an embodiment of the present application;

[0030] Figure 5 Provide an architectural diagram of the protection system for existing subnet connections;

[0031] Figure 6a An architecture diagram of an n-transmit n-receive subnet connection protection system provided in an embodiment of the present application;

[0032] Figure 6b Provided in the embodiments of this application Figure 6a The architecture diagram of the subnet connection protection system when a faulty optical cable occurs;

[0033] Figure 6c An architectural diagram of another n-transmit n-receive subnet connection protection system provided in an embodiment of the present application;

[0034] Figure 7a An architectural diagram of another n-transmit and n-receive client-side protection optical transmission system provided in an embodiment of the present application;

[0035] Figure 7b Provided in the embodiments of this application Figure 7a The architecture diagram of the client-side protection optical transmission system when a faulty optical cable occurs is shown;

[0036] Figure 7c An architectural diagram of another n-transmit and n-receive client-side protection optical transmission system provided in an embodiment of the present application;

[0037] Figure 8a A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0038] Figure 8b A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0039] Figure 8c A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0040] Figure 8d A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0041] Figure 8e A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0042] Figure 8f A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0043] Figure 8g A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0044] Figure 8h A flowchart of an optical signal transmission method provided in an embodiment of the present application;

[0045] Figure 9 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the access relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of the present application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship. In addition, in the embodiments of the present application, "first", "second", "third", etc. are only used to distinguish the contents of different objects and have no other special meanings.

[0048] Depending on the different positions of optical switches in the optical transmission system, common optical transmission systems may include: Optical Multiplex Section Protection (OMSP) system, Optical Channel Protection (OCHP) system, Sub-Network Connection Protection (SNCP) system, etc.

[0049] First, combine Figure 1 The existing Optical Multiplex Section Protection (OMSP) system is introduced. Figure 1 The following is the architecture diagram of the existing optical multiplex section protection system. Figure 1 The optical multiplex section protection system includes a local end and a peer end. A primary optical cable and a backup optical cable connect the local end and the peer end. The primary and backup optical cables can be dual-core fiber cables. The optical signals of the two single-core fiber cables in a dual-core fiber cable are transmitted in different directions. Figure 1 The transmission direction of the optical signal of the single-core optical fiber cable represented by the solid line of the main optical cable is that the optical signal is sent from the local end to the remote end; Figure 1The transmission direction of the optical signal of the single-core optical fiber cable represented by the dotted line of the main optical cable is that the optical signal is sent from the opposite end to the local end; Figure 1 The transmission direction of the optical signal of the single-core optical fiber cable represented by the solid line of the spare optical cable is that the optical signal is sent from the local end to the opposite end; Figure 1 The single-core fiber optic cable, represented by the dotted line of the backup cable, transmits optical signals from the remote end to the local end. When transmitting in a single-core fiber optic cable, an optical signal passes through a booster amplifier (BA), a line amplifier (LA), and a pre-amplifier (PA) in sequence. The booster amplifier increases the optical power at the fiber input. The optical power at the fiber input refers to the power of the optical signal entering the fiber.

[0050] Both the local end and the remote end can serve as the transmitting end or the receiving end. Taking the local end as the transmitting end and the remote end as the receiving end as an example, at the transmitting end, multiple optical signals sent by multiple optical transponders (OTs) are aggregated (i.e., combined) by an optical multiplexer / demultiplexer (OMD). The combined optical signals are then split into two identical optical signals by a 1×2 optical splitter in the optical line protection (OLP) device. One optical signal is transmitted to the receiving end via a primary optical cable, and the other optical signal is transmitted to the receiving end via a backup optical cable. Under normal circumstances, the receiving end selects the optical path through the 2×1 optical switch (Optical Switch) in the OLP, selects the main optical cable from the main optical cable and the backup optical cable, and receives the optical signal transmitted by the main optical cable. The received optical signal is divided into multiple optical signals through the OMD (Optical Multiplexer / Demultiplexer, wavelength division multiplexing / demultiplexing device), and the multiple optical signals are output to the outside through the optical transceiver.

[0051] Existing OMSP systems use a dual-transmit selective-receive method for protection. This means that the OMSP system's transmitter simultaneously sends two identical optical signals, which are transmitted via two different optical cables (a primary cable and a backup cable). Under normal circumstances, the OMSP system's receiver receives the optical signal from the primary cable. If the primary cable fails, the OMSP system's receiver receives the optical signal from the backup cable, thus providing protection and ensuring the reliability of the OMSP system. However, this dual-transmit selective-receive method wastes the bandwidth resources of one optical cable, doubling the bandwidth transmission costs of the entire OMSP system.

[0052] Figure 2aThis is an architecture diagram of an n-transmit n-receive optical multiplex section protection system provided in an embodiment of the present application. Figure 2a The n-transmit, n-receive OMSP system includes: a first device and a second device; the first device and the second device each include multiple optical transceivers, n combiners, n splitters, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the optical transceivers are connected to the input port of the first optical switch via the combiner, and the output port of the second optical switch is connected to the optical transceiver via the splitter; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables, and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables.

[0053] In this embodiment, the combiner provided between the optical transceiver and the input port of the first optical switch can be any combiner, and the demultiplexer provided between the optical transceiver and the output port of the second optical switch can be any demultiplexer. For example, the combiner can be a multiplexer in an OMD, and the demultiplexer can be a demultiplexer in an OMD. Figure 2a In the figure, the combiner provided between the optical transceiver and the input port of the first optical switch is shown as OMD, and the demultiplexer provided between the optical transceiver and the output port of the second optical switch is shown as OMD. Figure 2a The OMD shown is just an example.

[0054] In this embodiment, n first optical cables and second optical cables are connected between the first device and the second device. The first optical cables and the second optical cables can be any optical fiber cables and are not limited thereto. Figure 2a In the embodiment, n dual-core optical fiber cables are connected between the first device and the second device, each dual-core optical fiber cable includes two single-core optical fiber cables, one of which is used as the first optical cable and the other is used as the second optical cable. Figure 2a The dual-core optical fiber cable shown is only an example. Optionally, when the optical signal is transmitted in the first optical cable or the second optical cable, it may pass through the BA, LA, and PA in sequence.

[0055] In this embodiment, the first optical switch and the second optical switch are both n×n optical switches, that is, they have n input ports and n output ports. Figure 2a For example, the n input ports of the first optical switch are denoted as a1, a2, ..., an; the n input ports of the first optical switch are denoted as b1, b2, ..., bn; the n input ports of the second optical switch are denoted as c1, c2, ..., cn; and the n input ports of the second optical switch are denoted as d1, d2, ..., dn.

[0056] In this embodiment, the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables. Thus, when the first device functions as a transmitter and the second device functions as a receiver, the first device transmits n optical signals to the second device via the n first optical cables.

[0057] In this embodiment, the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables. Thus, when the first device functions as a receiving end and the second device functions as a transmitting end, the second device transmits n optical signals to the first device via the n second optical cables.

[0058] In this embodiment, each combiner disposed between the optical transceiver and the first optical switch is configured to receive optical signals of different wavelengths transmitted by multiple optical transceivers and combine the multiple optical signals of different wavelengths to produce a combined optical signal (which can be understood as a combined optical signal). The combined optical signal is transmitted via the first optical switch to an optical cable, which is then transmitted to the second optical switch. Each demultiplexer disposed between the optical transceiver and the second optical switch is configured to demultiplex the combined optical signal received from the optical cable to produce multiple demultiplexed optical signals of different wavelengths. These demultiplexed optical signals of different wavelengths are then output via multiple optical transceivers connected to the demultiplexer.

[0059] In this embodiment, each combiner disposed between the optical transceiver and the first optical switch is connected to an input interface of the first optical switch, and the n combiners are respectively connected to the n input interfaces of the first optical switch. Each demultiplexer disposed between the optical transceiver and the second optical switch is connected to an output interface of the second optical switch, and the n demultiplexers are respectively connected to the n output interfaces of the second optical switch.

[0060] In this embodiment, one of the first device and the second device is a transmitter, and the other is a receiver. The transmitter is configured to receive multiple optical signals of different priorities via multiple optical transceivers, combine the multiple optical signals of different priorities into n optical signals of different priorities via n combiners, and transmit the n optical signals of different priorities to n optical cables via a first optical switch in the transmitter.

[0061] In various embodiments of the present application, there is no restriction on the method for determining the priority of the optical signal. For example, the priority of the optical signal can be divided according to the Service Level Agreement (SLA) level. The higher the SLA level, the higher the priority. The high-priority optical signal is preferentially placed on the link with the high SLA level. The high-priority optical signal can also preempt other links with low SLA levels in the event of a link failure. For another example, the optical signal is divided based on the link availability requirements. The greater the required link availability, the higher the priority of the optical signal. The high-priority optical signal is preferentially placed on the link with high availability. The high-priority optical signal can also preempt other links with low link availability in the event of a link failure. For another example, the optical signal is divided based on the transmission link delay requirements. The lower the required link transmission delay, the higher the priority of the optical signal. The high-priority optical signal is preferentially placed on the link with lower delay. The high-priority optical signal can also preempt other links with low delay in the event of a link failure. In other words, the high-priority optical signal is preferentially placed on the high-priority link. The high-priority optical signal can also preempt other links with low priority in the event of a link failure.

[0062] In various embodiments of the present application, the optical signal carries service data, and the service data includes, but is not limited to, video data, call voice data, image data, or text data.

[0063] Specifically, at least one optical signal received by each combiner is an optical signal of the same priority, and different combiners receive optical signals of different priorities. For example, the priorities, in descending order, are SLA1, SLA2, and SLA3. Combiner 1 combines multiple SLA1 optical signals to obtain a combined SLA1 optical signal; combiner 2 combines multiple SLA2 optical signals to obtain a combined SLA2 optical signal; and combiner 3 combines multiple SLA3 optical signals to obtain a combined SLA3 optical signal. N optical signals of different priorities are sent through the first optical switch to n optical cables, with each optical cable transmitting one optical signal, and the n optical cables transmitting n optical signals. If the transmitting end is the first device, the n optical cables are n first optical cables; if the transmitting end is the second device, the n optical cables are n second optical cables.

[0064] In this embodiment, the receiving end is configured to receive n optical signals from n optical cables via a second optical switch in the receiving end, split the n optical signals of different priorities into multiple optical signals via n wave splitters, and output the multiple optical signals via multiple optical transceivers; perform fault detection on the n optical cables; and if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0065] In this embodiment, each splitter splits the combined optical signal into one or more optical signals with different wavelengths, and transmits the one or more optical signals with different wavelengths through one or more optical transceivers connected to the splitter.

[0066] In this embodiment, the receiving end not only receives n optical signals sent by the transmitting end through n optical cables, but also performs fault detection on the n optical cables.

[0067] As an example, when the receiving end performs fault detection, it is specifically used to: detect the received optical power of n input ports of the second optical switch of the receiving end; if there is a target input port in the second optical switch of the receiving end whose received optical power does not meet the requirements, then determine the optical cable connected to the target input port as a faulty optical cable.

[0068] For example, if the received optical power of the input port of the second optical switch at the receiving end is less than a set power threshold, then the input port is a target input port whose received optical power does not meet the requirement; if the received optical power of the input port of the second optical switch at the receiving end is greater than or equal to the set power threshold, then the input port is an input port whose received optical power meets the requirement. For another example, if the received optical power of the input port of the second optical switch at the receiving end does not fall within a set power range, then the input port is a target input port whose received optical power does not meet the requirement; if the received optical power of the input port of the second optical switch at the receiving end falls within the set power range, then the input port is an input port whose received optical power meets the requirement.

[0069] In some optional embodiments, see Figure 2b , the first device and the second device also include n transmitters and n receivers, the n transmitters in the first device are connected to the n receivers in the second device through n first optical cables, and the n transmitters in the second device are connected to the n receivers in the first device through n second optical cables.

[0070] Optional, see Figure 2bThe output port of the first optical switch in the first device is connected to the optical cable inlet of the first optical cable through a combiner. The combiner to which the output port of the first optical switch in the first device is connected is also connected to a transmitter. The optical cable outlet of the first optical cable is connected to the input port of the second optical switch in the second device through a splitter. The splitter to which the input port of the second optical switch in the first device is connected is also connected to a receiver.

[0071] Optional, see Figure 2b The output port of the first optical switch in the second device is connected to the optical cable inlet of the second optical cable through a combiner. The combiner to which the output port of the first optical switch in the second device is connected is also connected to a transmitter. The optical cable outlet of the second optical cable is connected to the input port of the second optical switch in the first device through a splitter. The splitter to which the input port of the second optical switch in the second device is connected is also connected to a receiver.

[0072] As another example, when the receiving end performs fault detection, it is specifically used to: detect the received optical power of n receivers in the receiving end; if there is a target receiver among the n receivers in the receiving end whose received optical power does not meet the requirements, then the optical cable connected to the target receiver is determined to be a faulty optical cable.

[0073] For example, if the received optical power of a receiver in a receiving end is less than a set power threshold, the receiver is considered a target receiver whose received optical power does not meet the requirements; if the received optical power of a receiver in a receiving end is greater than or equal to the set power threshold, the receiver is considered a receiver whose received optical power meets the requirements. For another example, if the received optical power of a receiver in a receiving end does not fall within a set power range, the receiver is considered a target receiver whose received optical power does not meet the requirements; if the received optical power of a receiver in a receiving end falls within the set power range, the receiver in the receiving end is considered a receiver whose received optical power meets the requirements.

[0074] As another example, when the receiving end performs fault detection, it is specifically used to: control the n receivers of the receiving end to respectively perform handshake connections with the n transmitters of the sending end; if there is a target receiver among the n receivers in the receiving end that fails the handshake, the optical cable connected to the target receiver is determined to be a faulty optical cable.

[0075] Specifically, for a receiver and transmitter connected to the same optical cable, the receiver at the receiving end is controlled to send a handshake connection request to the transmitter at the sending end. If the handshake between the receiver at the receiving end and the transmitter at the sending end is successful, the optical cable connected to the receiver at the receiving end is normal. If the handshake between the receiver at the receiving end and the transmitter at the sending end fails, the optical cable connected to the receiver at the receiving end is faulty.

[0076] In this embodiment, if the receiving end detects a faulty optical cable and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end and the second optical switch in the receiving end are controlled to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0077] In actual applications, if multiple normal optical cables have lower priorities than the faulty optical cable, then one of the normal optical cables is selected to replace the faulty cable and transmit the optical signal that was transmitted by the faulty cable before the fault. Alternatively, the normal optical cable with the lowest or highest priority can be selected from the normal optical cables to replace the faulty cable and transmit the optical signal that was transmitted by the faulty cable before the fault. There is no restriction on this.

[0078] Optionally, when the receiving end controls the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching, the control is specifically used to: control the output port connected to the input port connected to the faulty optical cable and the input port connected to the normal optical cable in the second optical switch of the receiving end to switch, and send a switching instruction to the transmitting end; wherein, the switching instruction is used to control the output port connected to the output port connected to the faulty optical cable and the output port connected to the normal optical cable in the first optical switch of the transmitting end to switch.

[0079] For example, if the transmitting end is the first device, the receiving end is the second device, and n is 3, the priorities of the optical signals from high to low are: dual-core fiber cable 1, dual-core fiber cable 2, and dual-core fiber cable 3. Figure 2a The following table shows the connectivity between the input and output ports of the first optical switch at the transmitting end and the second optical switch at the receiving end of optical cable n under normal conditions. The a1 input port and the b1 output port of the first optical switch at the transmitting end are connected, the a2 input port and the b2 output port of the first optical switch at the transmitting end are connected, and the a3 input port and the b3 output port of the first optical switch at the transmitting end are connected. The c1 input port and the d1 output port of the second optical switch at the receiving end are connected, the c2 input port and the d2 output port of the second optical switch at the receiving end are connected, and the c3 input port and the d3 output port of the second optical switch at the receiving end are connected.

[0080] Figure 2cThe connectivity between the input and output ports of the first optical switch at the transmitting end and the second optical switch at the receiving end, when a faulty optical cable is present in n optical cables. Specifically, the first optical cable in dual-core fiber cable 1 is faulty, the first optical cable in dual-core fiber cable 2 is not faulty (i.e., operating normally), and the first optical cable in dual-core fiber cable 3 is not faulty (i.e., operating normally). The b1 output port of the first optical switch at the transmitting end switches from being connected to the a1 input port to being connected to the a2 output port. The b2 output port of the first optical switch at the transmitting end switches from being connected to the a2 input port to being connected to the a1 input port. The a3 input port of the first optical switch at the transmitting end is connected to the b3 output port. The c1 input port of the second optical switch at the receiving end switches from being connected to the d1 output port to being connected to the d2 output port. The c2 input port of the second optical switch at the receiving end switches from being connected to the d2 output port to being connected to the d1 output port. The c3 input port of the second optical switch at the receiving end is connected to the d3 output port.

[0081] In this embodiment, when all n optical cables are normal, i.e., under normal conditions, optical signals are prioritized and transmitted through the n optical cables, each with different priorities. This eliminates the waste of cable bandwidth resources, fully utilizes the bandwidth resources of the OMSP system, and improves resource utilization. If a faulty optical cable occurs among the n optical cables, i.e., under normal conditions, and the priority of the optical signals transmitted by the faulty optical cable before the fault is higher than the priority of the optical signals transmitted by the normal optical cables, protection switching is triggered through optical path switching. The protection switching time remains on the order of milliseconds, allowing the optical signals transmitted by the faulty optical cable before the fault to be transmitted by the normal optical cables, effectively protecting the high-priority optical signals.

[0082] In this embodiment, for any optical cable, the output port of the first optical switch at the transmitting end to which the optical cable is connected and the input port of the first optical switch at the transmitting end to which the output port of the first optical switch at the transmitting end is connected are determined; the input port of the second optical switch at the receiving end to which the optical cable is connected and the output port of the second optical switch at the receiving end to which the input port of the second optical switch at the receiving end is connected are determined; and a correspondence is established between the port identifier of the input port of the first optical switch at the transmitting end, the port identifier of the output port of the first optical switch at the transmitting end, the optical cable identifier, the port identifier of the input port of the second optical switch at the receiving end, and the port identifier of the output port of the second optical switch at the receiving end.

[0083] It is understood that after the receiving and transmitting ends switch optical paths, the above correspondence is updated based on the latest port connection status of the optical cable. If the above correspondence is not updated after the receiving and transmitting ends switch optical paths, a return switching method can be used. That is, the optical signal transmitted by the faulty optical cable before the fault continues to be transmitted by the faulty optical cable, and the normal optical cable continues to transmit the previous optical signal, and the optical signal transmitted by the faulty optical cable and the optical signal transmitted by the normal optical cable are not switched.

[0084] In this embodiment, the switching instruction may be sent to the receiver at the transmitting end through the transmitter at the receiving end, but the present invention is not limited thereto.

[0085] In this embodiment, there is no restriction on the timing of optical path switching between the receiving end and the transmitting end. The following introduces several timing design methods for optical path switching:

[0086] (1) The receiving end first performs unidirectional switching and then notifies the transmitting end to perform unidirectional switching. Specifically, the receiving end first controls the second optical switch in the receiving end to switch the optical path, and then sends a switching instruction to the transmitting end to trigger the first optical switch in the transmitting end to switch the optical path. After the transmitting end completes the unidirectional switching, it can send a message to the receiving end confirming the completion of the unidirectional switching, so that the receiving end can confirm that the dual-end linkage switching has been completed.

[0087] (2) The transmitter first performs unidirectional switching and then notifies the receiver to perform unidirectional switching. Specifically, the receiver sends a switching instruction to the transmitter to trigger the first optical switch in the transmitter to switch the optical path. After the transmitter completes the unidirectional switching, it can send a message to the receiver to confirm the completion of the unidirectional switching. Then, the receiver controls the second optical switch in the receiver to switch the optical path, completing the dual-end linkage switching.

[0088] (3) The receiving end switches the input port connected to the faulty optical cable and the input port connected to the normal optical cable in the second optical switch of the receiving end to neutral or blocked. The receiving end sends a switching instruction to the transmitting end to trigger the first optical switch in the transmitting end to switch the optical path. After the transmitting end completes the unidirectional switching, it can send a message to the receiving end confirming the completion of the unidirectional switching. Then, the receiving end controls the second optical switch in the receiving end to switch the optical path to complete the dual-end linkage switching.

[0089] (4) The receiving end does not perform unidirectional switching, but notifies the transmitting end to perform unidirectional switching. Specifically, the receiving end sends a switching instruction to the transmitting end to trigger the first optical switch in the transmitting end to switch the optical path. After the transmitting end completes the unidirectional switching, it can send a message to the receiving end confirming the completion of the unidirectional switching, so that the receiving end can confirm that the switching has been completed. This switching method will cause the interconnection topology to change.

[0090] (5) The receiving end first performs bidirectional switching and then notifies the transmitting end to perform bidirectional switching. Specifically, the receiving end and the transmitting end are connected via n dual-core optical fiber cables. The receiving end first controls the second optical switch and the first optical switch in the receiving end to switch the optical paths, and then sends a switching instruction to the transmitting end to trigger the first and second optical switches in the transmitting end to switch the optical paths. After the transmitting end completes the bidirectional switching, it can send a message to the receiving end confirming the completion of the bidirectional switching, so that the receiving end can confirm that the bidirectional linkage switching has been completed.

[0091] It is worth noting that when any single-core optical fiber cable in a dual-core optical fiber cable fails, the dual-core optical fiber cable is regarded as a faulty dual-core optical fiber cable, and the output port connected to the input port connected to the normal dual-core optical fiber cable in the second optical switch at the receiving end is switched, and the output port connected to the input port connected to the faulty dual-core optical fiber cable in the first optical switch at the receiving end is switched, that is, the receiving end performs bidirectional switching.

[0092] The input ports connected to the output port of the first optical switch at the transmitting end connected to the faulty dual-core optical fiber cable and the output port connected to the normal dual-core optical fiber cable are switched, and the input ports connected to the output port of the second optical switch at the transmitting end connected to the faulty dual-core optical fiber cable and the output port connected to the normal dual-core optical fiber cable are switched, that is, the transmitting end performs bidirectional switching.

[0093] (6) The transmitter first performs bidirectional switching and then notifies the receiver to perform bidirectional switching. Specifically, the receiver and transmitter are connected via n dual-core optical fiber cables. The receiver sends a switching instruction to the transmitter to trigger the first and second optical switches in the transmitter to switch optical paths. After the transmitter completes the bidirectional switching, it can send a message to the receiver to confirm the completion of the bidirectional switching. The receiver then controls the second and first optical switches in the transmitter to switch optical paths, completing the bidirectional switching.

[0094] (7) The receiving end does not perform bidirectional switching and notifies the transmitting end to perform bidirectional switching. Specifically, the receiving end sends a switching instruction to the transmitting end to trigger the first optical switch and the second optical switch in the transmitting end to switch the optical path. After the transmitting end completes the bidirectional switching, it can send a message to the receiving end confirming the completion of the bidirectional switching. This switching method will cause the interconnection topology to change.

[0095] In this embodiment, if the dual-end linkage switching is not confirmed to be completed, the current switching status may be checked. If it is an unexpected status or the two ends are disconnected, an alarm is reported.

[0096] In this embodiment, the receiving end is further configured to prohibit controlling the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable.

[0097] It can be understood that if the priority of the optical signal transmitted by the faulty optical cable before the failure is lower than the priority of the optical signal transmitted by the normal optical cable, no optical path switching will be performed, that is, protection switching will not be triggered, and the optical signal with low priority will not be protected, thereby effectively avoiding the situation where the optical cable transmitting the optical signal with low priority fails and the optical cable transmitting the optical signal with high priority is preempted by protection switching, thereby effectively protecting the optical signal with high priority.

[0098] Specifically, n optical cables transmit n optical signals of different priorities, each with a different priority. The higher the priority, the lower the probability of the corresponding optical cable being preempted, while the lower the priority, the greater the probability of the corresponding optical cable being preempted. For example, assume that there are four optical cables. Suppose that optical cable 1 transmits an optical signal of priority 1, optical cable 2 transmits an optical signal of priority 2, optical cable 3 transmits an optical signal of priority 3, and optical cable 4 transmits an optical signal of priority 4. Assuming that the cables are sorted in descending order of priority, namely priority 1, priority 2, priority 3, and priority 4, then, in descending order of priority, the order of preemption for the optical cables is cable 1, cable 2, cable 3, and cable 4.

[0099] If optical cable 1 fails, optical cables 2, 3, and 4 can be used to transmit the optical signal of priority 1 transmitted by optical cable 1 before the failure. If optical cable 2 fails, optical cables 3 and 4 can be used to transmit the optical signal of priority 2 transmitted by optical cable 2 before the failure. If optical cable 3 fails, optical cable 4 can be used to transmit the optical signal of priority 3 transmitted by optical cable 3 before the failure. If optical cable 4 fails, other optical cables cannot be used to transmit the optical signal of priority 4 transmitted by optical cable 4 before the failure. The n-transmit-n-receive optical multiplex section protection system provided in the embodiment of the present application classifies the optical signals by priority. On the one hand, when all n optical cables are normal, that is, under non-fault conditions, n optical signals of different priorities are transmitted through n optical cables, and the bandwidth resources of the optical cables will not be wasted. The bandwidth resources of the OMSP system are fully utilized, and the resource utilization rate of the OMSP system is improved. On the other hand, when a faulty optical cable appears among the n optical cables, that is, under a fault condition, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the protection switching is triggered by optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. In other words, the normal optical cable that transmits the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable, thereby achieving effective protection of the high-priority optical signal and ensuring the reliability of the OMSP system.

[0100] Figure 3 This is the architecture diagram of the existing optical channel protection system. Figure 3 The optical channel protection system includes a local end and a peer end. A primary optical cable and a backup optical cable are used between the local end and the peer end. The primary and backup optical cables can be dual-core fiber cables. The optical signals of the two single-core fiber cables in a dual-core fiber cable are transmitted in different directions. Figure 3 The transmission direction of the optical signal of the single-core optical fiber cable represented by the solid line of the main optical cable is that the optical signal is sent from the local end to the remote end; Figure 3 The transmission direction of the optical signal of the single-core optical fiber cable represented by the dotted line of the main optical cable is that the optical signal is sent from the opposite end to the local end; Figure 3 The transmission direction of the optical signal of the single-core optical fiber cable represented by the solid line of the spare optical cable is that the optical signal is sent from the local end to the opposite end; Figure 3 The single-core fiber optic cable represented by the dotted line of the backup cable transmits the optical signal from the remote end to the local end. When the optical signal is transmitted in the single-core fiber optic cable, it can pass through the BA, LA, and PA in sequence.

[0101] See also Figure 3 Unlike the OMSP system, the OLP device in the OCHP system is located between the OT and the OMD, enabling channel-level protection. Both the local and remote ends can function as transmitters or receivers. For example, assuming the local end is the transmitter and the remote end is the receiver, at the transmitter, the optical signal sent by the optical transceiver is split by a 1×2 optical splitter within the OLP device, splitting it into two identical optical signals. One optical signal is first wavelength-aggregated by the OMD before being transmitted via the primary optical cable to the receiver. The other optical signal is first wavelength-aggregated by the OMD before being transmitted via the backup optical cable to the receiver. Under normal circumstances, at the receiver, the optical signals transmitted by both the primary and backup optical cables are wavelength-demultiplexed by the OMD. The 2×1 optical switch within the OLP device then selects the primary optical cable from the two cables, receiving the optical signal transmitted by the primary cable and outputting it via the optical transceiver.

[0102] Existing OCHP systems use a dual-transmit selective-receive method for protection. This means that the OCHP system's transmitter simultaneously sends two identical optical signals, which are transmitted via two different optical cables (a primary cable and a backup cable). Under normal circumstances, the OCHP system's receiver receives the optical signal from the primary cable. If the primary cable fails, the receiver receives the optical signal from the backup cable, thus providing protection and ensuring the reliability of the OCHP system. However, this dual-transmit selective-receive method wastes the bandwidth resources of one optical cable, doubling the bandwidth transmission cost of the entire OCHP system.

[0103] Figure 4a This is an architecture diagram of an n-transmit n-receive optical channel protection system provided in an embodiment of the present application. Figure 4a The n-transmit, n-receive optical channel protection system includes: a first device and a second device; the first device and the second device each include n optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the optical transceiver is connected to the input port of the first optical switch, and the output port of the second optical switch is connected to the optical transceiver; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables, and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; a combiner is further provided between the output port of the first optical switch in the first device and the first optical cable, and a demultiplexer is further provided between the first optical cable and the input port of the second optical switch in the second device; a combiner is further provided between the output port of the first optical switch in the second device and the second optical cable, and a demultiplexer is further provided between the second optical cable and the input port of the second optical switch in the second device;

[0104] In this embodiment, the combiner may be any combiner, and the demultiplexer may be any demultiplexer. For example, the combiner may be a multiplexer in an OMD, and the demultiplexer may be a demultiplexer in the OMD. Figure 4a The combiner is shown as OMD, the splitter is shown as OMD, and of course, Figure 4a The OMD shown is only an example. It is understandable that n OMDs are equivalent to n combiners and n splitters.

[0105] In this embodiment, n first optical cables and second optical cables are connected between the first device and the second device. The first optical cables and the second optical cables can be any optical fiber cables and are not limited thereto. Figure 4a In the embodiment, n dual-core optical fiber cables are connected between the first device and the second device, each dual-core optical fiber cable includes two single-core optical fiber cables, one of which is used as the first optical cable and the other is used as the second optical cable. Figure 4a The dual-core optical fiber cable shown is only an example. Optionally, when the optical signal is transmitted in the first optical cable or the second optical cable, it may pass through the BA, LA, and PA in sequence.

[0106] In this embodiment, the first optical switch and the second optical switch are both n×n optical switches, that is, they have n input ports and n output ports. Figure 4aFor example, the n input ports of the first optical switch are denoted as a1, a2, ..., an; the n input ports of the first optical switch are denoted as b1, b2, ..., bn; the n input ports of the second optical switch are denoted as c1, c2, ..., cn; and the n input ports of the second optical switch are denoted as d1, d2, ..., dn.

[0107] In this embodiment, the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables. Thus, when the first device functions as a transmitter and the second device functions as a receiver, the first device transmits n optical signals to the second device via the n first optical cables.

[0108] In this embodiment, the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables. Thus, when the first device functions as a receiving end and the second device functions as a transmitting end, the second device transmits n optical signals to the first device via the n second optical cables.

[0109] In this embodiment, the first optical switch is located between the optical transceiver and the combiner, and the second optical switch is located between the optical transceiver and the demultiplexer. The optical signal received by the optical transceiver is input to an input port of the first optical switch. The optical signal output from the output port of the first optical switch is connected to the optical cable via the combiner. The optical signal output from the optical cable is input to the input port of the second optical switch via the demultiplexer. The optical signal output from the output port of the second optical switch is transmitted by the optical transceiver.

[0110] In this embodiment, one of the first device and the second device is a transmitter, and the other is a receiver. The transmitter is configured to receive n optical signals of different priorities via n optical transceivers, and to transmit the n optical signals of different priorities to n optical cables via a first optical switch and n combiners in the transmitter.

[0111] Specifically, each optical transceiver connected to the input port of the first optical switch at the transmitting end receives at least one optical signal of the same priority, and the n optical transceivers receive n optical signals of different priorities. For example, the priorities are, in descending order, priority 1, priority 2, and priority 3. Optical transceiver 1 receives at least one optical signal of priority 1, optical transceiver 2 receives at least one optical signal of priority 2, and optical transceiver 3 receives at least one optical signal of priority 3. The optical signals output by the n output ports of the first optical switch are respectively input into n combiners, each combiner outputting an optical signal of one priority. The n combiners output n optical signals of different priorities. The n optical signals of different priorities output by the n combiners are transmitted to the receiving end via n optical cables. If the transmitting end is the first device, the n optical cables are n first optical cables; if the transmitting end is the second device, the n optical cables are n second optical cables.

[0112] In this embodiment, the receiving end is configured to receive n optical signals from n optical cables via n wave splitters and a second optical switch in the receiving end, and output the n optical signals externally via n optical transceivers; perform fault detection on the n optical cables; and if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0113] Specifically, n optical signals output by n optical cables are respectively input into n wave splitters, each wave splitter outputs a split optical signal, and the optical signal output by the wave splitter is input into an input port of a second optical switch at the receiving end. The n optical signals output by the n output ports of the second optical switch at the receiving end are transmitted through n optical transceivers.

[0114] In this embodiment, the receiving end also performs fault detection on n optical cables. Several exemplary fault detection methods are given below.

[0115] Method 1: Detecting the received optical powers of n input ports of the second optical switch at the receiving end; if there is a target input port in the second optical switch at the receiving end whose received optical power does not meet the requirement, determining the optical cable connected to the target input port as a faulty optical cable.

[0116] Method 2: Detect the received optical power of n optical cables, wherein the received optical power of the optical cable refers to the received optical power of the optical transceiver at the receiving end connected to the optical cable via the second optical switch; if there is an optical cable with a received optical power that does not meet the requirement among the n optical cables, the optical cable with the received optical power that does not meet the requirement is determined to be a faulty optical cable. Figure 4a Taking the second device in the example as a receiving end, the optical transceiver in the receiving end connected to the optical cable via the second optical switch is the OT connected to the output port of the second optical switch in the second device.

[0117] For example, if the received optical power of an optical cable is less than the set power threshold, the cable is considered a faulty cable, with the received optical power not meeting the requirements. If the received optical power of an optical cable is greater than or equal to the set power threshold, the cable is considered a normal cable, with the received optical power meeting the requirements. For another example, if the received optical power of an optical cable does not fall within the set power range, the cable is considered a faulty cable, with the received optical power not meeting the requirements. If the received optical power of an optical cable falls within the set power range, the cable is considered a normal cable, with the received optical power meeting the requirements.

[0118] Method 3: Detecting the bit error rate of n optical cables, where the bit error rate of the optical cable refers to the bit error rate of the optical transceiver at the receiving end connected to the optical cable via the second optical switch; if any of the n optical cables has a bit error rate that does not meet the requirement, the optical cable with the unsatisfactory bit error rate is determined to be a faulty optical cable.

[0119] For example, if the bit error rate of an optical cable is less than a set bit error rate threshold, the optical cable is considered a faulty optical cable with a bit error rate that does not meet the requirements; if the bit error rate of an optical cable is greater than or equal to the set bit error rate threshold, the optical cable is considered a normal optical cable with a bit error rate that meets the requirements. For another example, if the bit error rate of an optical cable does not fall within the set bit error rate range, the optical cable is considered a faulty optical cable with a bit error rate that does not meet the requirements; if the bit error rate of an optical cable falls within the set bit error rate range, the optical cable is considered a normal optical cable with a bit error rate that meets the requirements.

[0120] Method 4: Detecting whether maintenance signals indicating a fault are present on n optical cables, and identifying the optical cable displaying the maintenance signal as a faulty optical cable. The maintenance signal indicating a fault on the optical cable refers to a maintenance signal indicating a fault on the optical transceiver at the receiving end connected to the optical cable via the second optical switch. Examples of maintenance signals include, but are not limited to, Loss of Signal (LOS), Loss of Frame (LOF), and Out of Frame (OOF).

[0121] In practical applications, one or more of the methods 1 to 4 may be used simultaneously for fault detection, and there is no limitation on this.

[0122] In this embodiment, if the receiving end detects a faulty optical cable and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end and the second optical switch in the receiving end are controlled to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0123] Optionally, when the receiving end controls the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching, the control is specifically used to: control the output port connected to the input port connected to the faulty optical cable and the input port connected to the normal optical cable in the second optical switch of the receiving end to switch, and send a switching instruction to the transmitting end; wherein, the switching instruction is used to control the output port connected to the output port connected to the faulty optical cable and the output port connected to the normal optical cable in the first optical switch of the transmitting end to switch.

[0124] For example, if the transmitting end is the first device, the receiving end is the second device, and n is 3, the priorities of the optical signals from high to low are: dual-core fiber cable 1, dual-core fiber cable 2, and dual-core fiber cable 3. Figure 4aThis figure shows the connectivity between the input and output ports of the first optical switch at the transmitting end and the second optical switch at the receiving end of optical cable n under normal conditions. Input port a1 and output port b1 of the first optical switch at the transmitting end are connected, input port a2 and output port b2 of the first optical switch at the transmitting end are connected, and input port a3 and output port b3 of the first optical switch at the transmitting end are connected. Input port c1 and output port d1 of the second optical switch at the receiving end are connected, input port c2 and output port d2 of the second optical switch at the receiving end are connected, and input port c3 and output port d3 of the second optical switch at the receiving end are connected.

[0125] Figure 4b The figure shows the connectivity between the input and output ports of the first optical switch at the transmitting end and the second optical switch at the receiving end in the case of a faulty optical cable in n optical cables. Specifically, the first optical cable in dual-core fiber cable 1 is faulty, the first optical cable in dual-core fiber cable 2 is not faulty (i.e., operating normally), and the first optical cable in dual-core fiber cable 3 is not faulty (i.e., operating normally). The b1 output port in the first optical switch at the transmitting end switches from connecting to the a1 input port to connecting to the a2 output port. The b2 output port in the first optical switch at the transmitting end switches from connecting to the a2 input port to connecting to the a1 input port. The a3 input port in the first optical switch at the transmitting end is connected to the b3 output port. The c1 input port in the second optical switch at the receiving end switches from connecting to the d1 output port to connecting to the d2 output port. The c2 input port in the second optical switch at the receiving end switches from connecting to the d2 output port to connecting to the d1 output port. The c3 input port in the second optical switch at the receiving end is connected to the d3 output port.

[0126] In this embodiment, when all n optical cables are functioning normally (i.e., under normal conditions), optical signals are prioritized and transmitted through the n optical cables, each with different priorities. This eliminates the waste of cable bandwidth resources, fully utilizes the bandwidth resources of the OCHP system, and improves resource utilization. If a faulty optical cable occurs among the n optical cables (i.e., under fault conditions), and the priority of the optical signals transmitted by the faulty optical cable before the fault is higher than that of the optical signals transmitted by the normal optical cables, protection switching is triggered by optical path switching. The protection switching time remains on the order of milliseconds, ensuring that the optical signals transmitted by the faulty optical cable before the fault are transmitted by the normal optical cables, effectively protecting the high-priority optical signals.

[0127] In this embodiment, for any optical cable, the output port of the first optical switch at the transmitting end to which the optical cable is connected and the input port of the first optical switch at the transmitting end to which the output port of the first optical switch at the transmitting end is connected are determined; the input port of the second optical switch at the receiving end to which the optical cable is connected and the output port of the second optical switch at the receiving end to which the input port of the second optical switch at the receiving end is connected are determined; and a correspondence is established between the port identifier of the input port of the first optical switch at the transmitting end, the port identifier of the output port of the first optical switch at the transmitting end, the optical cable identifier, the port identifier of the input port of the second optical switch at the receiving end, and the port identifier of the output port of the second optical switch at the receiving end.

[0128] It is understood that after the receiving and transmitting ends switch optical paths, the above correspondence is updated based on the latest port connection status of the optical cable. If the above correspondence is not updated after the receiving and transmitting ends switch optical paths, a return switching method can be used. That is, the optical signal transmitted by the faulty optical cable before the fault continues to be transmitted by the faulty optical cable, and the normal optical cable continues to transmit the previous optical signal, and the optical signal transmitted by the faulty optical cable and the optical signal transmitted by the normal optical cable are not switched.

[0129] In this embodiment, there is no restriction on the timing of switching the optical paths between the receiving end and the transmitting end. For the timing design of switching the optical paths between the receiving end and the transmitting end, please refer to the relevant introduction of the above embodiment.

[0130] In this embodiment, the receiving end is further configured to prohibit controlling the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable.

[0131] It can be understood that if the priority of the optical signal transmitted by the faulty optical cable before the failure is lower than the priority of the optical signal transmitted by the normal optical cable, no optical path switching will be performed, that is, protection switching will not be triggered, and the optical signal with low priority will not be protected, thereby effectively avoiding the situation where the optical cable transmitting the optical signal with low priority fails and the optical cable transmitting the optical signal with high priority is preempted by protection switching, thereby effectively protecting the optical signal with high priority.

[0132] The n-transmit, n-receive optical channel protection system provided in the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, i.e., under normal conditions, n optical signals with different priorities are transmitted through the n optical cables, eliminating waste in terms of optical cable bandwidth resources. The bandwidth resources of the OCHP system are fully utilized, thereby improving resource utilization. On the other hand, when a faulty optical cable occurs among the n optical cables, i.e., under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than that of the optical signal transmitted by the normal optical cable, protection switching is triggered through optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. This means that the normal optical cable transmitting the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable. This effectively protects the high-priority optical signal and ensures the reliability of the OCHP system.

[0133] Figure 4c This is an architecture diagram of another n-transmit n-receive optical channel protection system provided in an embodiment of the present application. Figure 4c The OCHP system shown is similar to Figure 4a The structure of the OCHP system shown is similar, except that Figure 4c The optical cable connecting the first device and the second device in the OCHP system shown is segmented, and two adjacent segments of the optical cable are connected via an optical receiver. Figure 4c The OCHP system shown can be called an n-transmit n-receive OCHP system with live relay. In practice, each optical cable can be divided into multiple sections, and there is no restriction on this. Figure 4c The OCHP system shown has two sections for each optical cable, which is just an example. Figure 4c In the diagram, duplex fiber optic cable 1 is divided into duplex fiber optic cable 1-1 and duplex fiber optic cable 1-2; duplex fiber optic cable 2 is divided into duplex fiber optic cable 2-1 and duplex fiber optic cable 2-2; and duplex fiber optic cable n is divided into duplex fiber optic cable n-1 and duplex fiber optic cable n-2.

[0134] For ease of explanation, for each optical cable connecting the first device and the second device, if the optical cable consists of multiple segments, each segment of the optical cable is referred to as an optical cable segment, that is, an optical cable includes multiple segments, and optical transceivers are set between adjacent segments. Figure 4c For two adjacent optical cable segments, the optical cable outlet of the previous optical cable segment is connected to the receiving port of the optical transceiver through a combiner, and the transmitting port of the optical transceiver is connected to the optical cable outlet of the next optical cable segment through a splitter. The combiner can be the multiplexer in the OMD, and the splitter can be the demultiplexer in the OMD. Figure 4c In the figure, the combiner between adjacent cable segments is shown as OMD, and the splitter between adjacent cable segments is shown as OMD. Figure 4c The OMD shown is just an example.

[0135] For an n-transmitter-n-receiver OCHP system with live relay, when the receiving end performs fault detection on n optical cables, the fault detection method of the OCHP system shown in 4a can be used.

[0136] Further optionally, for an n-transmitter-n-receiver OCHP system with powered relay, when the receiving end performs fault detection on n optical cables, the following exemplary fault detection methods may be used.

[0137] Method 1: Detect the received optical power of each optical cable segment in n optical cables, and determine the optical cable segment where the received optical power does not meet the requirement as the faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of the optical transceiver connected to the optical cable segment, and the optical transceiver connected to the optical cable segment is an optical transceiver set in the optical cable to divide the optical cable into segments, Figure 4c For example, the optical transceiver between the dual-core optical fiber cable 1-1 and the dual-core optical fiber cable 1-2 is the optical transceiver connecting the optical cable segments, and the optical transceiver between the dual-core optical fiber cable 2-1 and the dual-core optical fiber cable 2-2 is the optical transceiver connecting the optical cable segments.

[0138] If the received optical power of a cable segment is less than the set power threshold, the received optical power of that cable segment does not meet the requirement. If the received optical power of a cable segment is greater than or equal to the set power threshold, the received optical power of that cable segment meets the requirement. For another example, if the received optical power of a cable segment does not fall within the set power range, the received optical power of that cable segment does not meet the requirement. If the received optical power of a cable segment falls within the set power range, the received optical power of that cable segment meets the requirement.

[0139] Method 2: Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment.

[0140] For example, if the bit error rate of a fiber optic cable segment is less than a set bit error rate threshold, the bit error rate of the fiber optic cable segment does not meet the requirement; if the bit error rate of the fiber optic cable segment is greater than or equal to the set bit error rate threshold, the bit error rate of the fiber optic cable segment meets the requirement. For another example, if the bit error rate of the fiber optic cable segment does not fall within the set bit error rate range, the bit error rate of the fiber optic cable segment does not meet the requirement; if the bit error rate of the fiber optic cable segment falls within the set bit error rate range, the bit error rate of the fiber optic cable segment meets the requirement.

[0141] Method 3: Detect whether a maintenance signal reflecting a fault appears in each optical cable segment of n optical cables, and determine the optical cable where the optical cable segment with the maintenance signal appears is a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that the optical transceiver connected to the optical cable segment has a maintenance signal reflecting the fault.

[0142] In practical applications, one or more of the methods 1 to 3 may be used simultaneously for fault detection, and there is no limitation on this.

[0143] The n-transmit, n-receive optical channel protection system provided in the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, i.e., under non-fault conditions, the optical signals are prioritized and transmitted through the n optical cables, with n optical signals of different priorities. This eliminates the waste of optical cable bandwidth resources, fully utilizes the bandwidth resources of the OCHP system, and improves resource utilization of the OCHP system. On the other hand, when a faulty optical cable occurs among the n optical cables, i.e., under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, protection switching is triggered through optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. This means that the normal optical cable, which was transmitting the lower-priority optical signal, is preempted to transmit the higher-priority optical signal transmitted by the faulty optical cable. This effectively protects the higher-priority optical signal and ensures the reliability of the OCHP system.

[0144] Figure 5 The architecture diagram of the protection system for connecting existing subnets. Figure 5 The subnet connection protection system includes a local end and a peer end. A primary optical cable and a backup optical cable are used between the local end and the peer end. The primary and backup optical cables can be dual-core fiber cables. The optical signals of the two single-core fiber cables in a dual-core fiber cable are transmitted in different directions. Figure 5 The transmission direction of the optical signal of the single-core optical fiber cable represented by the solid line of the main optical cable is that the optical signal is sent from the local end to the remote end; Figure 5 The transmission direction of the optical signal of the single-core optical fiber cable represented by the dotted line of the main optical cable is that the optical signal is sent from the opposite end to the local end; Figure 5 The transmission direction of the optical signal of the single-core optical fiber cable represented by the solid line of the spare optical cable is that the optical signal is sent from the local end to the opposite end; Figure 5 The single-core fiber optic cable represented by the dotted line of the backup cable transmits the optical signal from the remote end to the local end. When the optical signal is transmitted in the single-core fiber optic cable, it can pass through the BA, LA, and PA in sequence.

[0145] Both the local and remote ends can function as transmitters or receivers. For example, the local end acts as the transmitter and the remote end acts as the receiver. At the transmitter, an optical signal is sent from the switch to the client port of the OT. Inside the OT on the transmitter side, the optical signal received at the client port is replicated into two identical optical signals. One optical signal is first wavelength-aggregated by the OMD before being transmitted via the primary optical cable to the receiver. The other optical signal is first wavelength-aggregated by the OMD before being transmitted via the backup optical cable to the receiver. Under normal circumstances, at the receiver side, the optical signals transmitted by the primary and backup optical cables are wavelength-demultiplexed by the OMD before arriving at the two line-side ports of the OT. Inside the OT on the receiver side, one optical signal is selected from the two received line-side ports and sent to the client port of the OT. The optical signal received by the client port of the OT is ultimately sent to the switch.

[0146] Existing SNCP systems employ a dual-transmit selective-receive approach for protection. This means that the SNCP system's transmitter simultaneously transmits two identical optical signals, each transmitted via two different optical cables (a primary and a backup). Under normal circumstances, the SNCP system's receiver receives the optical signal from the primary cable. If the primary cable fails, the receiver receives the optical signal from the backup cable, thus providing protection and ensuring the reliability of the SNCP system. However, this dual-transmit selective-receive approach wastes the bandwidth resources of one optical cable, doubling the bandwidth transmission costs of the entire SNCP system.

[0147] Figure 6a This is an architecture diagram of an n-send n-receive subnet connection protection system provided in an embodiment of the present application. Figure 6a The n-transmit, n-receive subnet connection protection system includes: a first device and a second device; the first device and the second device each include a switch, n combiners, n splitters, and an optical receiver, where n is a positive integer greater than 1, and the optical receiver includes a client-side port and a line-side port; the switch and the client-side port of the optical receiver are connected, the n line-side first ports of the optical receiver in the first device are connected to the n line-side second ports of the optical receiver in the second device via n first optical cables, and the n line-side first ports of the optical receiver in the second device are connected to the n line-side second ports of the optical receiver in the first device via n second optical cables;

[0148] In this embodiment, the combiner may be any combiner, and the demultiplexer may be any demultiplexer. For example, the combiner may be a multiplexer in an OMD, and the demultiplexer may be a demultiplexer in the OMD. Figure 6a The combiner is shown as OMD, the splitter is shown as OMD, and of course, Figure 6aThe OMD shown is only an example. It is understandable that n OMDs are equivalent to n combiners and n splitters.

[0149] In this embodiment, n first optical cables and second optical cables are connected between the first device and the second device. The first optical cables and the second optical cables can be any optical fiber cables and are not limited thereto. Figure 6a In the embodiment, n dual-core optical fiber cables are connected between the first device and the second device, each dual-core optical fiber cable includes two single-core optical fiber cables, one of which is used as the first optical cable ( Figure 6a The solid line in the middle), another single-core optical fiber cable as the second optical cable ( Figure 6a Of course, Figure 6a The dual-core optical fiber cable shown is only an example. Optionally, when the optical signal is transmitted in the first optical cable or the second optical cable, it may pass through the BA, LA, and PA in sequence.

[0150] In this embodiment, protection switching for an nxn optical switch is implemented within the optical receiver using an on-board electrical cross-connect. The optical receiver includes client-side ports and line-side ports. The client-side ports include n first ports and n second ports, while the line-side ports include n first ports and n second ports. Each client-side port can transmit at least one optical signal to a line-side port. It is understood that each client-side port can include multiple sub-ports, each of which receives multiple optical signals.

[0151] The n first ports on the client side can be connected to the n first ports on the line side, and the n second ports on the client side can be connected to the n second ports on the line side. The optical signal is input into the optical cable from the first port on the line side, and the optical signal transmitted by the optical cable is input into the second port on the line side.

[0152] In this embodiment, one of the first device and the second device is a transmitter, and the other is a receiver. The transmitter is configured to receive n optical signals of different priorities through a switch, and transmit the n optical signals of different priorities to n optical cables through an optical receiver and n combiners in the transmitter.

[0153] Specifically, the switch inputs n optical signals of different priorities into the first ports of n client sides of the optical transceiver in the transmitting end, where the priorities are priority 1, priority 2, and priority 3 in descending order. The first first port on the client side of the optical transceiver in the transmitting end receives at least one optical signal of priority 1 sent by the switch, the second first port on the client side of the optical transceiver in the transmitting end receives at least one optical signal of priority 2 sent by the switch, and the third first port on the client side of the optical transceiver in the transmitting end receives at least one optical signal of priority 3 sent by the switch.

[0154] The optical signals output by the first ports of the n line sides of the optical transceiver at the transmitting end are respectively input into n combiners. Each combiner outputs one optical signal of a certain priority. The n combiners output n optical signals of different priorities. These n optical signals of different priorities output by the n combiners are transmitted to the receiving end via n optical cables. If the transmitting end is the first device, the n optical cables are n first optical cables; if the transmitting end is the second device, the n optical cables are n second optical cables.

[0155] The receiving end is configured to receive n optical signals from n optical cables via n wave splitters and an optical receiver in the receiving end, and output the n optical signals externally via a switch; perform fault detection on the n optical cables; and if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the optical receiver in the transmitting end and the optical receiver in the receiving end to perform an electrical cross-link operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0156] Specifically, the n optical signals output by n optical cables are respectively input into n wave splitters, each wave splitter outputs the splitted optical signal, and the optical signal output by the wave splitter is input into the second port on the line side of the optical transceiver at the receiving end. The n optical signals output by the second ports on the n client sides of the optical transceiver at the receiving end are transmitted through the switch.

[0157] In this embodiment, the receiving end also performs fault detection on n optical cables. Several exemplary fault detection methods are given below.

[0158] Method 1: Detecting the received optical power of the second port on the line side of the optical receiver in the receiving end; if there is a second port on the line side of the second port on the line side whose received optical power does not meet the requirement, the optical cable connected to the second port on the line side whose received optical power does not meet the requirement is determined to be a faulty optical cable.

[0159] For example, if the received optical power of the second port on the line side is less than the set power threshold, the received optical power of the second port on the line side does not meet the requirement. If the received optical power of the second port on the line side is greater than or equal to the set power threshold, the received optical power of the second port on the line side meets the requirement. For another example, if the received optical power of the second port on the line side does not fall within the set power range, the received optical power of the second port on the line side does not meet the requirement. If the received optical power of the second port on the line side falls within the set power range, the received optical power of the second port on the line side meets the requirement.

[0160] Method 2: Detecting the bit error rate of the second port on the line side of the optical receiver in the receiving end; if there is a second port on the line side of the optical receiver whose bit error rate does not meet the requirement, the optical cable connected to the second port on the line side with the bit error rate that does not meet the requirement is determined to be a faulty optical cable.

[0161] For example, if the bit error rate of the second port on the line side of the optical receiver is less than a set bit error rate threshold, the bit error rate of the second port on the line side does not meet the requirement; if the bit error rate of the second port on the line side of the optical receiver is greater than or equal to the set bit error rate threshold, the bit error rate of the second port on the line side meets the requirement. For another example, if the bit error rate of the second port on the line side of the optical receiver does not fall within a set bit error rate range, the bit error rate of the second port on the line side does not meet the requirement; if the bit error rate of the second port on the line side of the optical receiver falls within the set bit error rate range, the bit error rate of the second port on the line side meets the requirement.

[0162] Method 3: Detect whether a maintenance signal indicating a fault is present at the second port on the line side of the optical receiver at the receiving end, and determine that the optical cable connected to the second port on the line side where the maintenance signal is present is the faulty optical cable. Examples of maintenance signals include, but are not limited to, Loss of Signal (LOS), Loss of Frame (LOF), and Out of Frame (OOF).

[0163] Mode 4: Detect whether a maintenance signal indicating a fault appears on the first port on the client side of the optical receiver in the transmitting end, and determine the optical cable connected to the first port on the client side where the maintenance signal appears as the faulty optical cable.

[0164] In practical applications, one or more of the methods 1 to 4 may be used simultaneously for fault detection, and there is no limitation on this.

[0165] In this embodiment, if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the optical receiver in the transmitting end and the optical receiver in the receiving end are controlled to perform an electrical cross-operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0166] Optionally, when the receiving end controls the optical receiver in the transmitting end and the optical receiver in the receiving end to perform electrical cross-operation, it is specifically used to: control the second port on the client side connected between the second port on the line side connected to the faulty optical cable and the second port on the line side connected to the normal optical cable in the optical receiver at the receiving end, and send a switching instruction to the transmitting end; wherein the switching instruction is used to control the first port on the client side connected between the first port on the line side connected to the faulty optical cable and the first port on the line side connected to the normal optical cable in the optical receiver at the transmitting end.

[0167] For example, if the transmitting end is the first device, the receiving end is the second device, and n is 3, the priorities of the optical signals from high to low are: dual-core fiber cable 1, dual-core fiber cable 2, and dual-core fiber cable 3. Figure 6a The figure shows the port connectivity between the optical transceiver in the transmitting end and the optical transceiver in the receiving end of the optical fiber cable under normal conditions. Figure 6b The figure shows the port connectivity between the optical transceiver at the transmitting end and the optical transceiver at the receiving end when there is a fault in one of the n optical cables. Figure 6a and Figure 6b It can be seen that the first optical cable in dual-core fiber cable 1 is faulty, the first optical cable in dual-core fiber cable 2 is not faulty (i.e., normal), and the first optical cable in dual-core fiber cable 3 is not faulty (i.e., normal). The first client-side first port of the optical transceiver in the transmitting end switches from being connected to the first line-side first port of the optical transceiver in the transmitting end to being connected to the second line-side first port of the optical transceiver in the transmitting end. The first client-side first port of the optical transceiver in the transmitting end switches from being connected to the second line-side first port of the optical transceiver in the transmitting end to being connected to the first line-side first port of the optical transceiver in the transmitting end. The second line-side second port of the optical transceiver in the receiving end switches from being connected to the first client-side second port of the optical transceiver in the receiving end to being connected to the second client-side second port of the optical transceiver in the receiving end. The second line-side second port of the optical transceiver in the receiving end is switched from being connected to the second client-side second port of the optical transceiver in the receiving end to being connected to the first client-side second port of the optical transceiver in the receiving end.

[0168] Optionally, bidirectional switching can be performed when one of the two-fiber cables fails. Figure 6bIt can be seen that the second port on the first client side of the optical transceiver in the transmitting end is switched from being connected to the second port on the first line side of the optical transceiver in the transmitting end to being connected to the second port on the second line side of the optical transceiver in the transmitting end. The second port on the second client side of the optical transceiver in the transmitting end is switched from being connected to the second port on the second line side of the optical transceiver in the transmitting end to being connected to the second port on the first line side of the optical transceiver in the transmitting end. The first port on the first line side of the optical transceiver in the receiving end is switched from being connected to the first port on the first client side of the optical transceiver in the receiving end to being connected to the first port on the second client side of the optical transceiver in the receiving end. The first port on the second line side of the optical transceiver in the receiving end is switched from being connected to the first port on the second client side of the optical transceiver in the receiving end to being connected to the first port on the first client side of the optical transceiver in the receiving end.

[0169] In this embodiment, when all n optical cables are functioning normally (i.e., under normal conditions), optical signals are prioritized and n optical signals of different priorities are transmitted through the n optical cables. This eliminates the waste of cable bandwidth resources, fully utilizes the bandwidth resources of the SNCP system, and improves resource utilization of the SNCP system. If a faulty optical cable occurs among the n optical cables (i.e., under fault conditions), and the priority of the optical signals transmitted by the faulty optical cable before the fault is higher than the priority of the optical signals transmitted by the normal optical cables, protection switching is triggered through electrical cross-connection operations at the optical receiver. The protection switching time remains on the order of milliseconds, allowing the optical signals transmitted by the faulty optical cable before the fault to be transmitted by the normal optical cables, effectively protecting the high-priority optical signals.

[0170] In this embodiment, there is no restriction on the timing of the electrical crossover operation between the receiving end and the transmitting end. The following introduces several timing design methods for the electrical crossover operation:

[0171] (1) The receiving end first performs unidirectional switching and then notifies the transmitting end to perform unidirectional switching. Specifically, the receiving end first controls the optical transceiver in the receiving end to perform electrical cross-connection operation, and then sends a switching instruction to the transmitting end to trigger the optical transceiver in the transmitting end to perform electrical cross-connection operation. After the transmitting end completes the unidirectional switching, it can send a message to the receiving end to confirm the completion of the unidirectional switching, so that the receiving end can confirm that the dual-end linkage switching has been completed.

[0172] (2) The transmitter first performs unidirectional switching and then notifies the receiver to perform unidirectional switching. Specifically, the receiver sends a switching instruction to the transmitter to trigger the optical transceiver in the transmitter to perform an electrical cross-connection operation. After the transmitter completes the unidirectional switching, it can send a message to the receiver to confirm the completion of the unidirectional switching. Then, the receiver controls the optical transceiver in the receiver to perform an electrical cross-connection operation to complete the dual-end linkage switching.

[0173] (3) The receiving end switches the optical transceiver in the receiving end to the second port on the line side connected to the faulty optical cable and the second port on the line side connected to the normal optical cable to neutral or blocked positions, and sends a switching instruction to the transmitting end to trigger the optical transceiver in the transmitting end to perform an electrical cross-connection operation. After the transmitting end completes the unidirectional switching, it can send a message to the receiving end confirming the completion of the unidirectional switching. Then, the receiving end controls the optical transceiver in the receiving end to perform an electrical cross-connection operation to complete the dual-end linkage switching.

[0174] (4) The receiving end does not perform unidirectional switching, but notifies the transmitting end to perform unidirectional switching. Specifically, the receiving end sends a switching instruction to the transmitting end to trigger the optical transceiver in the transmitting end to perform electrical cross-connection operation. After the transmitting end completes the unidirectional switching, it can send a message confirming the completion of the unidirectional switching to the receiving end, so that the receiving end can confirm that the switching has been completed. This switching method will cause the interconnection topology to change.

[0175] (5) The receiving end first performs bidirectional switching and then notifies the transmitting end to perform bidirectional switching. Specifically, the receiving end and the transmitting end are connected via n dual-core optical fiber cables. The receiving end first controls the optical transceiver in the receiving end to perform electrical cross-connection operation, and then sends a switching instruction to the transmitting end to trigger the optical transceiver in the transmitting end to perform electrical cross-connection operation. After the transmitting end completes the bidirectional switching, it can send a message to the receiving end confirming the completion of the bidirectional switching, so that the receiving end can confirm that the bidirectional linkage switching has been completed.

[0176] In bidirectional switching, when one single-core fiber cable in a dual-core fiber cable fails, the other single-core fiber cable in the dual-core fiber cable is considered to be faulty as well.

[0177] For the bidirectional switching at the receiving end, the second port of the client side connected to the second port of the line side connected to the faulty optical cable in the optical receiver at the receiving end is switched, and the first port of the client side connected to the first port of the line side connected to the faulty optical cable in the optical receiver at the receiving end is switched.

[0178] For the bidirectional switching at the transmitting end, the first port of the client side connected to the first port on the line side connected to the faulty optical cable in the optical receiver at the transmitting end is switched with the first port on the line side connected to the normal optical cable; the second port of the client side connected to the second port on the line side connected to the faulty optical cable in the optical receiver at the transmitting end is switched with the second port on the line side connected to the normal optical cable.

[0179] (6) The transmitter first performs bidirectional switching and then notifies the receiver to perform bidirectional switching. Specifically, the receiver and transmitter are connected via n dual-core optical fiber cables. The receiver sends a switching instruction to the transmitter to trigger the optical transceiver in the transmitter to perform an electrical cross-connection operation. After the transmitter completes the bidirectional switching, it can send a message to the receiver to confirm the completion of the bidirectional switching. The receiver controls the optical transceiver in the receiver to perform an electrical cross-connection operation to complete the bidirectional switching.

[0180] (7) The receiving end does not perform bidirectional switching and notifies the transmitting end to perform bidirectional switching. Specifically, the receiving end sends a switching instruction to the transmitting end to trigger the optical transceiver in the transmitting end to perform electrical cross-connection operation. After the transmitting end completes the bidirectional switching, it can send a message to the receiving end to confirm the completion of the bidirectional switching. This switching method will cause the interconnection topology to change.

[0181] Optionally, the receiving end is further configured to prohibit controlling the optical receiver in the transmitting end and the optical receiver in the receiving end from performing electrical cross-operation if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable.

[0182] It can be understood that if the priority of the optical signal transmitted by the faulty optical cable before the failure is lower than the priority of the optical signal transmitted by the normal optical cable, no optical path switching will be performed, that is, protection switching will not be triggered, and the optical signal with low priority will not be protected, thereby effectively avoiding the situation where the optical cable transmitting the optical signal with low priority fails and the optical cable transmitting the optical signal with high priority is preempted by protection switching, thereby effectively protecting the optical signal with high priority.

[0183] The n-transmit-n-receive subnet connection protection system provided by the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, i.e., under non-fault conditions, n optical signals with different priorities are transmitted through the n optical cables, thereby avoiding wasting optical cable bandwidth resources. The bandwidth resources of the SNCP system are fully utilized, thereby improving resource utilization of the SNCP system. On the other hand, when a faulty optical cable occurs among the n optical cables, i.e., under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, protection switching is triggered through electrical cross-connection operation of the optical receiver, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. In other words, the normal optical cable transmitting the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable. This effectively protects the high-priority optical signal and ensures the reliability of the SNCP system.

[0184] Figure 6c This is an architectural diagram of another n-transmit n-receive subnet connection protection system provided in an embodiment of the present application. Figure 6c The SNCP system shown is similar to Figure 6aThe structure of the SNCP system shown is similar, except that Figure 6c The optical cable connecting the first device and the second device in the SNCP system shown is segmented, and two adjacent segments of the optical cable are connected via an optical receiver. Figure 6c The SNCP system shown can be called an n-transmit n-receive SNCP system with live relay. In practice, each optical cable can be divided into multiple sections, and there is no restriction on this. Figure 6c The SNCP system shown here has two sections for each optical cable, which is just an example. Figure 6c In the diagram, duplex fiber optic cable 1 is divided into duplex fiber optic cable 1-1 and duplex fiber optic cable 1-2; duplex fiber optic cable 2 is divided into duplex fiber optic cable 2-1 and duplex fiber optic cable 2-2; and duplex fiber optic cable n is divided into duplex fiber optic cable n-1 and duplex fiber optic cable n-2.

[0185] For ease of explanation, for each optical cable connecting the first device and the second device, if the optical cable consists of multiple segments, each segment of the optical cable is referred to as an optical cable segment, that is, an optical cable includes multiple segments, and optical transceivers are set between adjacent segments. Figure 6c For two adjacent optical cable segments, the optical cable outlet of the previous optical cable segment is connected to the receiving port of the optical transceiver through a combiner, and the transmitting port of the optical transceiver is connected to the optical cable outlet of the next optical cable segment through a splitter. The combiner can be the multiplexer in the OMD, and the splitter can be the demultiplexer in the OMD. Figure 6c In the figure, the combiner between adjacent cable segments is shown as OMD, and the splitter between adjacent cable segments is shown as OMD. Figure 6c The OMD shown is just an example.

[0186] For an SNCP system with n transmitters and n receivers and powered relays, the receiving end can use the fault detection method of the OCHP system shown in Figure 6a when performing fault detection on n optical cables.

[0187] Further optionally, for an n-transmitter-n-receiver SNCP system with powered relay, when the receiving end performs fault detection on n optical cables, the following exemplary fault detection methods may be used.

[0188] Method 1: Detect the received optical power of each optical cable segment among n optical cables, and determine the optical cable segment with a received optical power that does not meet the requirement as a faulty optical cable. The received optical power of the optical cable segment refers to the received optical power of the optical transceiver connected to the optical cable segment.

[0189] If the received optical power of a cable segment is less than the set power threshold, the received optical power of that cable segment does not meet the requirement. If the received optical power of a cable segment is greater than or equal to the set power threshold, the received optical power of that cable segment meets the requirement. For another example, if the received optical power of a cable segment does not fall within the set power range, the received optical power of that cable segment does not meet the requirement. If the received optical power of a cable segment falls within the set power range, the received optical power of that cable segment meets the requirement.

[0190] Method 2: Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment.

[0191] For example, if the bit error rate of a fiber optic cable segment is less than a set bit error rate threshold, the bit error rate of the fiber optic cable segment does not meet the requirement; if the bit error rate of the fiber optic cable segment is greater than or equal to the set bit error rate threshold, the bit error rate of the fiber optic cable segment meets the requirement. For another example, if the bit error rate of the fiber optic cable segment does not fall within the set bit error rate range, the bit error rate of the fiber optic cable segment does not meet the requirement; if the bit error rate of the fiber optic cable segment falls within the set bit error rate range, the bit error rate of the fiber optic cable segment meets the requirement.

[0192] Method 3: Detect whether a maintenance signal reflecting a fault appears in each optical cable segment of n optical cables, and determine the optical cable where the optical cable segment with the maintenance signal appears is a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that the optical transceiver connected to the optical cable segment has a maintenance signal reflecting the fault.

[0193] In practical applications, one or more of the methods 1 to 3 may be used simultaneously for fault detection, and there is no limitation on this.

[0194] The n-transmit-n-receive subnet connection protection system provided by the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, i.e., under non-fault conditions, n optical signals with different priorities are transmitted through the n optical cables, eliminating the waste of cable bandwidth resources. The bandwidth resources of the SNCP system are fully utilized, thereby improving the resource utilization of the SNCP system. On the other hand, when a faulty optical cable occurs among the n optical cables, i.e., under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, protection switching is triggered through electrical cross-talk at the optical receiver, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. In other words, the normal optical cable transmitting the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable. This effectively protects the high-priority optical signal and ensures the reliability of the SNCP system.

[0195] Currently, the dual-transmit and selective-receive method of existing optical transmission systems wastes the bandwidth resources of an optical cable, doubling the bandwidth transmission cost of the entire optical transmission system. To this end, the embodiments of the present application provide a new optical transmission system, which can be called an n-transmit and n-receive client-side protection optical transmission system.

[0196] Figure 7a This is an architecture diagram of an n-transmit n-receive client-side protection optical transmission system provided in an embodiment of the present application. Figure 7a The n-transmit, n-receive client-side protection optical transmission system includes: a first device and a second device; the first device and the second device each include n switches, n optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the switches are connected to the first optical switch and the second optical switch, respectively; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables; the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; the output ports of the first optical switch are connected to the optical cables via the optical transceiver and the combiner, and the optical cables are connected to the input ports of the second optical switch via the demultiplexer and the optical transceiver;

[0197] In this embodiment, the combiner can be any combiner, and the demultiplexer can be any demultiplexer. For example, the combiner can be a multiplexer in an OMD, and the demultiplexer can be a demultiplexer in an OMD. Figure 7a In the figure, the combiner is shown as OMD and the demultiplexer is shown as OMD. Of course, Figure 7a The OMD shown is just an example.

[0198] In this embodiment, n first optical cables and second optical cables are connected between the first device and the second device. The first optical cables and the second optical cables can be any optical fiber cables and are not limited thereto. Figure 7a In the embodiment, n dual-core optical fiber cables are connected between the first device and the second device, each dual-core optical fiber cable includes two single-core optical fiber cables, one of which is used as the first optical cable and the other is used as the second optical cable. Figure 7a The dual-core optical fiber cable shown is only an example. Optionally, when the optical signal is transmitted in the first optical cable or the second optical cable, it may pass through the BA, LA, and PA in sequence.

[0199] In this embodiment, the first optical switch and the second optical switch are both n×n optical switches, that is, they have n input ports and n output ports. Figure 7aFor example, the n input ports of the first optical switch are denoted as a1, a2, ..., an; the n input ports of the first optical switch are denoted as b1, b2, ..., bn; the n input ports of the second optical switch are denoted as c1, c2, ..., cn; and the n input ports of the second optical switch are denoted as d1, d2, ..., dn.

[0200] In this embodiment, one of the first device and the second device serves as a transmitting end, and the other serves as a receiving end.

[0201] In this embodiment, the transmitting end is used to receive n optical signals of different priorities through a switch, and send the n optical signals of different priorities to n optical cables respectively through the first optical switch, n optical transceivers, and n combiners in the transmitting end.

[0202] The receiving end is configured to receive n optical signals from n optical cables via n wave splitters, n optical receivers, and a second optical switch in the receiving end, and output the n optical signals externally via the switch; perform fault detection on the n optical cables; and if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the first optical switch in the transmitting end and the second optical switch in the receiving end to perform optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0203] In this embodiment, n optical signals output by the switch are input to n input ports of a first optical switch at the transmitting end. The n output ports of the first optical switch at the transmitting end are input to n combiners via n optical receivers. The n optical signals output by the n combiners are respectively sent to n optical cables. The n optical signals output by the n optical cables are input to n splitters. The n optical signals output by the n splitters are input to n optical receivers. The n optical signals output by the n optical receivers are input to n input ports of a second optical switch at the receiving end. The n optical signals output by the n output ports of the second optical switch at the receiving end are transmitted through the switch.

[0204] In this embodiment, the receiving end not only receives n optical signals sent by the transmitting end through n optical cables, but also performs fault detection on the n optical cables. For details on the fault detection method, please refer to the fault detection method of the n-transmitter-n-receiver optical multiplex section protection system, which will not be repeated here.

[0205] Optionally, when the receiving end controls the first optical switch in the transmitting end and the second optical switch in the receiving end to switch the optical path, it is specifically used to: control the output port connected to the input port connected to the faulty optical cable and the input port connected to the normal optical cable in the second optical switch of the receiving end to switch, and send a switching instruction to the transmitting end; wherein, the switching instruction is used to control the output port connected to the output port connected to the faulty optical cable and the output port connected to the normal optical cable in the first optical switch of the transmitting end to switch.

[0206] For the optical path switching method, please refer to the optical path switching method of the n-transmit n-receive optical multiplex section protection system, which will not be repeated here.

[0207] For example, if the transmitting end is the first device, the receiving end is the second device, and n is 3, the priorities of the optical signals from high to low are: dual-core fiber cable 1, dual-core fiber cable 2, and dual-core fiber cable 3. Figure 7a This figure shows the connectivity between the input and output ports of the first optical switch at the transmitting end and the second optical switch at the receiving end of optical cable n under normal conditions. Input port a1 and output port b1 of the first optical switch at the transmitting end are connected, input port a2 and output port b2 of the first optical switch at the transmitting end are connected, and input port a3 and output port b3 of the first optical switch at the transmitting end are connected. Input port c1 and output port d1 of the second optical switch at the receiving end are connected, input port c2 and output port d2 of the second optical switch at the receiving end are connected, and input port c3 and output port d3 of the second optical switch at the receiving end are connected.

[0208] Figure 7b The figure shows the connectivity between the input and output ports of the first optical switch at the transmitting end and the second optical switch at the receiving end in the case of a faulty optical cable in n optical cables. Specifically, the first optical cable in dual-core fiber cable 1 is faulty, the first optical cable in dual-core fiber cable 2 is not faulty (i.e., operating normally), and the first optical cable in dual-core fiber cable 3 is not faulty (i.e., operating normally). The b1 output port in the first optical switch at the transmitting end switches from connecting to the a1 input port to connecting to the a2 output port. The b2 output port in the first optical switch at the transmitting end switches from connecting to the a2 input port to connecting to the a1 input port. The a3 input port in the first optical switch at the transmitting end is connected to the b3 output port. The c1 input port in the second optical switch at the receiving end switches from connecting to the d1 output port to connecting to the d2 output port. The c2 input port in the second optical switch at the receiving end switches from connecting to the d2 output port to connecting to the d1 output port. The c3 input port in the second optical switch at the receiving end is connected to the d3 output port.

[0209] Optionally, the receiving end is further configured to prohibit controlling the first optical switch in the transmitting end and the second optical switch in the receiving end to switch optical paths if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable.

[0210] It can be understood that if the priority of the optical signal transmitted by the faulty optical cable before the failure is lower than the priority of the optical signal transmitted by the normal optical cable, no optical path switching will be performed, that is, protection switching will not be triggered, and the optical signal with low priority will not be protected, thereby effectively avoiding the situation where the optical cable transmitting the optical signal with low priority fails and the optical cable transmitting the optical signal with high priority is preempted by protection switching, thereby effectively protecting the optical signal with high priority.

[0211] The n-transmit, n-receive client-side protection optical transmission system provided in the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, i.e., under non-fault conditions, n optical signals of different priorities are transmitted through the n optical cables, thereby avoiding wasting cable bandwidth resources. The bandwidth resources of the client-side protection optical transmission system are fully utilized, thereby improving resource utilization of the client-side protection optical transmission system. On the other hand, when a faulty optical cable occurs among the n optical cables, i.e., under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, protection switching is triggered through optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. In other words, the normal optical cable transmitting the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable, thereby effectively protecting the high-priority optical signal and ensuring the reliability of the client-side protection optical transmission system.

[0212] Figure 7c This is an architecture diagram of another n-transmit and n-receive client-side protection optical transmission system provided in an embodiment of the present application. Figure 7c The SNCP system shown is similar to Figure 7a The structure of the client side protection optical transmission system shown is similar, except that: Figure 7c The optical cable connecting the first device and the second device in the client-side protection optical transmission system shown is segmented, and two adjacent segments of the optical cable are connected via an optical receiver. Figure 7c The client side protection optical transmission system shown can be called an n-transmit n-receive client side protection optical transmission system with powered relay. In practice, each optical cable can be divided into multiple sections, and there is no restriction on this. Figure 7c In the client-side protection optical transmission system shown, each optical cable is divided into two sections, which is only an example. Figure 7cIn the diagram, duplex fiber optic cable 1 is divided into duplex fiber optic cable 1-1 and duplex fiber optic cable 1-2; duplex fiber optic cable 2 is divided into duplex fiber optic cable 2-1 and duplex fiber optic cable 2-2; and duplex fiber optic cable n is divided into duplex fiber optic cable n-1 and duplex fiber optic cable n-2.

[0213] For ease of explanation, for each optical cable connecting the first device and the second device, if the optical cable consists of multiple segments, each segment of the optical cable is referred to as an optical cable segment, that is, an optical cable includes multiple segments, and optical transceivers are set between adjacent segments. Figure 7c For two adjacent optical cable segments, the optical cable outlet of the previous optical cable segment is connected to the receiving port of the optical transceiver through a combiner, and the transmitting port of the optical transceiver is connected to the optical cable outlet of the next optical cable segment through a splitter. The combiner can be the multiplexer in the OMD, and the splitter can be the demultiplexer in the OMD. Figure 7c In the figure, the combiner between adjacent cable segments is shown as OMD, and the splitter between adjacent cable segments is shown as OMD. Figure 7c The OMD shown is just an example.

[0214] For the client-side protection optical transmission system with n-transmit and n-receive transmission and powered relay, when the receiving end detects faults on n optical cables, the fault detection method of the n-transmit and n-receive optical multiplex section protection system can be adopted.

[0215] Further optionally, for a client-side protection optical transmission system with n transmitters and n receivers and powered relays, when the receiving end performs fault detection on n optical cables, the following exemplary fault detection methods may be used.

[0216] Method 1: Detect the received optical power of each optical cable segment among n optical cables, and determine the optical cable segment with a received optical power that does not meet the requirement as a faulty optical cable. The received optical power of the optical cable segment refers to the received optical power of the optical transceiver connected to the optical cable segment.

[0217] Method 2: Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment.

[0218] Method 3: Detect whether a maintenance signal reflecting a fault appears in each optical cable segment of n optical cables, and determine the optical cable where the optical cable segment with the maintenance signal appears is a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that the optical transceiver connected to the optical cable segment has a maintenance signal reflecting the fault.

[0219] In practical applications, one or more of the methods 1 to 3 may be used simultaneously for fault detection, and there is no limitation on this.

[0220] The n-transmit, n-receive client-side protection optical transmission system provided in the embodiments of the present application prioritizes optical signals. On the one hand, when all n optical cables are normal, i.e., under non-fault conditions, n optical signals of different priorities are transmitted through the n optical cables, thereby avoiding wasting cable bandwidth resources. The bandwidth resources of the client-side protection optical transmission system are fully utilized, thereby improving resource utilization of the client-side protection optical transmission system. On the other hand, when a faulty optical cable occurs among the n optical cables, i.e., under fault conditions, if the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, protection switching is triggered through optical path switching, so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable. In other words, the normal optical cable transmitting the low-priority optical signal is preempted to transmit the high-priority optical signal transmitted by the faulty optical cable, thereby effectively protecting the high-priority optical signal and ensuring the reliability of the client-side protection optical transmission system.

[0221] An embodiment of the present application further provides an optical signal transmission method for an n-transmitter, n-receiver client-side protection optical transmission system, the system comprising: a first device and a second device; the first device and the second device both comprising n switches, n optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the switches are connected to the first optical switch and the second optical switch, respectively; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables; the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; the output ports of the first optical switch are connected to the optical cables via the optical transceiver and the combiner, and the optical cables are connected to the input ports of the second optical switch via the demultiplexer and the optical transceiver; one of the first device and the second device is a transmitting end, and the other is a receiving end; the method comprising the following steps:

[0222] S1. The transmitter receives n optical signals of different priorities through a switch, and sends the n optical signals of different priorities to n optical cables through the first optical switch, n optical transceivers, and n combiners in the transmitter.

[0223] S2. The receiving end receives n optical signals from n optical cables through n wave splitters, n optical receivers, and a second optical switch in the receiving end, and outputs the n optical signals through the switch; fault detection is performed on the n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end and the second optical switch in the receiving end are controlled to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0224] For detailed contents and technical effects of each step in the above method embodiment, please refer to the relevant description of the above embodiment.

[0225] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0226] Figure 8a This is a flow chart of an optical signal transmission method provided in an embodiment of the present application. This method is applied to the transmitting end, see Figure 8b ,The method comprises the following steps:

[0227] 101. Receive multiple optical signals of different priorities through multiple optical transceivers in the transmitting end, combine the multiple optical signals of different priorities into n optical signals of different priorities through n combiners, and respectively send the n optical signals of different priorities to n optical cables through a first optical switch in the transmitting end;

[0228] 102. In response to a faulty optical cable occurring among the n optical cables, and the priority of an optical signal transmitted by the faulty optical cable before the fault is higher than the priority of an optical signal transmitted by a normal optical cable, controlling the first optical switch in the transmitting end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0229] In practical applications, the transmitting end can perform optical path switching upon notification from the receiving end. Optionally, controlling the first optical switch in the transmitting end to perform optical path switching includes: controlling the first optical switch in the transmitting end to switch the input port connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable according to the switching instruction.

[0230] Optionally, the method further includes: prohibiting the control of the first optical switch in the transmitting end to perform optical path switching if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable.

[0231] The above method can be applied to the transmitter in an n-transmit-n-receive optical multiplex section protection system. For details and technical effects of each step in the optical signal transmission method performed by the transmitter, please refer to the introduction of the above related embodiments.

[0232] Figure 8bThis is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the receiving end, see Figure 8b ,The method comprises the following steps:

[0233] 201. Receive n optical signals from n optical cables through a second optical switch at a receiving end, split the n optical signals of different priorities into multiple optical signals through n splitters, and output the multiple optical signals externally through multiple optical transceivers.

[0234] 202. Perform fault detection on n optical cables.

[0235] 203. If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the second optical switch in the receiving end to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0236] Optionally, performing fault detection on n optical cables includes: detecting the received optical power of n input ports of the second optical switch at the receiving end; if there is a target input port in the second optical switch at the receiving end whose received optical power does not meet the requirement, determining the optical cable connected to the target input port as a faulty optical cable.

[0237] Optionally, the first device and the second device further include n transmitters and n receivers, the n transmitters in the first device are connected to the n receivers in the second device via n first optical cables, and the n transmitters in the second device are connected to the n receivers in the first device via n second optical cables;

[0238] Accordingly, when the receiving end performs fault detection, it is specifically used to:

[0239] Detect the received optical power of n receivers at the receiving end;

[0240] If there is a target receiver among the n receivers in the receiving end whose received optical power does not meet the requirement, the optical cable connected to the target receiver is determined to be a faulty optical cable;

[0241] and / or,

[0242] Control the n receivers at the receiving end to respectively establish handshake connections with the n transmitters at the sending end;

[0243] If there is a target receiver whose handshake fails among the n receivers in the receiving end, the optical cable connected to the target receiver is determined to be a faulty optical cable.

[0244] Optionally, controlling the second optical switch in the receiving end to perform optical path switching includes: controlling the second optical switch in the receiving end to switch the output port connected between the input port connected to the faulty optical cable and the input port connected to the normal optical cable, and sending a switching instruction to the transmitting end; wherein the switching instruction is used to control the output port in the first optical switch in the transmitting end to switch the input port connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable.

[0245] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the second optical switch in the receiving end from performing optical path switching.

[0246] The above method can be applied to the receiving end of an n-transmit n-receive optical multiplex section protection system. For details and technical effects of each step in the optical signal transmission method performed by the receiving end, please refer to the introduction of the above related embodiments.

[0247] Figure 8c This is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the transmitting end, see Figure 8c ,The method comprises the following steps:

[0248] 301. Receive n optical signals of different priorities through n optical transceivers in a transmitting end, and respectively send the n optical signals of different priorities to n optical cables through a first optical switch and n combiners in the transmitting end;

[0249] 302. In response to a faulty optical cable occurring among the n optical cables, and the priority of an optical signal transmitted by the faulty optical cable before the fault is higher than the priority of an optical signal transmitted by a normal optical cable, controlling the first optical switch in the transmitting end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0250] In practical applications, the transmitting end can perform optical path switching upon notification from the receiving end. Optionally, controlling the first optical switch in the transmitting end to perform optical path switching includes: controlling the first optical switch in the transmitting end to switch the input port connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable according to the switching instruction.

[0251] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the first optical switch in the transmitting end from performing optical path switching.

[0252] The above method can be applied to the transmitter in an n-transmit-n-receive optical channel protection system. For details and technical effects of each step in the optical signal transmission method performed by the transmitter, please refer to the introduction of the above related embodiments.

[0253] Figure 8d This is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the receiving end, see Figure 8d ,The method comprises the following steps:

[0254] 401. Receive n optical signals from n optical cables through n wave splitters and a second optical switch at a receiving end, and output the n optical signals to the outside through n optical transceivers.

[0255] 402. Perform fault detection on n optical cables;

[0256] 403. If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the second optical switch in the receiving end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0257] Optionally, performing fault detection on n optical cables includes: detecting the received optical power of n input ports of the second optical switch at the receiving end; if a target input port whose received optical power does not meet the requirement exists in the second optical switch at the receiving end, determining the optical cable connected to the target input port as a faulty optical cable; or, detecting the received optical power of n optical cables, wherein the received optical power of the optical cables refers to the received optical power of an optical transceiver at the receiving end connected to the optical cables via the second optical switch; if an optical cable whose received optical power does not meet the requirement exists among the n optical cables, determining the optical cable whose received optical power does not meet the requirement as a faulty optical cable; or, detecting the bit error rate of the n optical cables, wherein the bit error rate of the optical cables refers to the bit error rate of the optical transceiver at the receiving end connected to the optical cables via the second optical switch; if an optical cable whose bit error rate does not meet the requirement exists among the n optical cables, determining the optical cable whose bit error rate does not meet the requirement as a faulty optical cable; or,

[0258] Detecting whether maintenance signals reflecting a fault appear on n optical cables, and determining an optical cable that appears the maintenance signal as a faulty optical cable, wherein the maintenance signal reflecting the fault appears on the optical cable refers to the maintenance signal reflecting the fault appearing on an optical transceiver at a receiving end connected to the optical cable via a second optical switch.

[0259] Optionally, controlling the second optical switch in the receiving end to perform optical path switching includes: controlling the second optical switch in the receiving end to switch the output port connected between the input port connected to the faulty optical cable and the input port connected to the normal optical cable, and sending a switching instruction to the transmitting end; wherein the switching instruction is used to control the output port in the first optical switch in the transmitting end to switch the input port connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable.

[0260] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the second optical switch in the receiving end from performing optical path switching.

[0261] Optionally, at least one optical transceiver is provided on the first optical cable and the second optical cable, and the first optical cable and the second optical cable include a plurality of optical cable segments; when the receiving end performs fault detection, it is specifically configured to:

[0262] detecting the received optical power of each optical cable segment among n optical cables, and determining an optical cable segment having an optical cable segment whose received optical power does not meet the requirement as a faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of an optical transceiver connected to the optical cable segment; and / or,

[0263] Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment; and / or,

[0264] Whether a maintenance signal reflecting a fault appears in each optical cable segment among n optical cables, and the optical cable where the optical cable segment appears the maintenance signal is determined as a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that an optical transceiver connected to the optical cable segment appears a maintenance signal reflecting the fault.

[0265] The above method can be applied to the receiving end of an n-transmitting n-receiving optical channel protection system. For details and technical effects of each step in the optical signal transmission method performed by the receiving end, please refer to the introduction of the above related embodiments.

[0266] Figure 8e This is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the transmitting end, see Figure 8e ,The method comprises the following steps:

[0267] 501. Receive n optical signals of different priorities through a switch in a transmitter, and send the n optical signals of different priorities to n optical cables respectively through an optical receiver and n combiners in the transmitter;

[0268] 502. In response to a faulty optical cable appearing among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the optical receiver in the transmitting end to perform an electrical cross-connection operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0269] Optionally, controlling the optical receiver in the transmitting end to perform an electrical cross-operation includes: controlling the optical receiver in the transmitting end to switch the first port on the client side connected between the first port on the line side connected to the faulty optical cable and the first port on the line side connected to the normal optical cable according to a switching instruction.

[0270] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the optical receiver in the optical receiver in the control transmitting end from performing electrical cross-connection operation.

[0271] The above method can be applied to the transmitter in the n-transmit-n-receive subnet connection protection system. For details and technical effects of each step in the optical signal transmission method performed by the transmitter, please refer to the introduction of the above related embodiments.

[0272] Figure 8f This is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the receiving end, see Figure 8f ,The method comprises the following steps:

[0273] 601. Receive n optical signals from n optical cables through n splitters and an optical receiver at a receiving end, and output the n optical signals to the outside through a switch;

[0274] 602. Perform fault detection on n optical cables;

[0275] 603. If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the optical receiver in the receiving end to perform an electrical cross-connection operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0276] Optionally, controlling an optical receiver in a receiving end to perform an electrical cross-connect operation includes:

[0277] Controlling the optical receiver at the receiving end to switch the second port on the line side connected to the faulty optical cable and the second port on the line side connected to the normal optical cable to which the second port on the client side is connected, and sending a switching instruction to the transmitting end;

[0278] The switching instruction is used to control the optical receiver at the transmitting end to switch the first port on the client side connected between the first port on the line side connected to the faulty optical cable and the first port on the line side connected to the normal optical cable.

[0279] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the optical receiver in the control receiving end from performing the electrical cross-connection operation.

[0280] Optionally, at least one optical transceiver is provided on the first optical cable and the second optical cable, and the first optical cable and the second optical cable include a plurality of optical cable segments;

[0281] The receiving end is specifically used for fault detection when:

[0282] detecting the received optical power of each optical cable segment among n optical cables, and determining an optical cable segment having an optical cable segment whose received optical power does not meet the requirement as a faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of an optical transceiver connected to the optical cable segment; and / or,

[0283] Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment; and / or,

[0284] Whether a maintenance signal reflecting a fault appears in each optical cable segment among n optical cables, and the optical cable where the optical cable segment appears the maintenance signal is determined as a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that an optical transceiver connected to the optical cable segment appears a maintenance signal reflecting the fault.

[0285] The above method can be applied to the receiving end of the n-transmitting n-receiving subnet connection protection system. For details and technical effects of each step in the optical signal transmission method performed by the receiving end, please refer to the introduction of the above related embodiments.

[0286] Figure 8g This is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the transmitting end, see Figure 8g ,The method comprises the following steps:

[0287] 701. Receive n optical signals of different priorities through a switch, and send the n optical signals of different priorities to n optical cables respectively through a first optical switch, n optical transceivers, and n combiners in a transmitting end;

[0288] 702. In response to a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the first optical switch in the transmitting end to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0289] In practical applications, the transmitting end can perform optical path switching upon notification from the receiving end. Optionally, controlling the first optical switch in the transmitting end to perform optical path switching includes: controlling the first optical switch in the transmitting end to switch the input port connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable according to the switching instruction.

[0290] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the first optical switch in the transmitting end from performing optical path switching.

[0291] The above method can be applied to the transmitter in an n-transmit-n-receive client-side protection optical transmission system. For details and technical effects of each step in the optical signal transmission method performed by the transmitter, please refer to the introduction of the above related embodiments.

[0292] Figure 8h This is a flow chart of another optical signal transmission method provided in an embodiment of the present application. This method is applied to the receiving end, see Figure 8h ,The method comprises the following steps:

[0293] 801. Receive n optical signals from n optical cables through n wave splitters, n optical receivers, and a second optical switch at a receiving end, and output the n optical signals to the outside through the switch.

[0294] 802. Perform fault detection on n optical cables;

[0295] 803. If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, control the second optical switch in the receiving end to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

[0296] Optionally, controlling the second optical switch in the receiving end to switch the optical path includes:

[0297] Controlling the second optical switch at the receiving end to switch the output port connected to the input port connected to the faulty optical cable and the input port connected to the normal optical cable, and sending a switching instruction to the transmitting end;

[0298] The switching instruction is used to control the switching of the input ports connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable in the first optical switch at the transmitting end.

[0299] Optionally, the method further includes: if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable, prohibiting the second optical switch in the receiving end from performing optical path switching.

[0300] Optionally, at least one optical transceiver is provided on the first optical cable and the second optical cable, and the first optical cable and the second optical cable include a plurality of optical cable segments;

[0301] The receiving end is specifically used for fault detection when:

[0302] detecting the received optical power of each optical cable segment among n optical cables, and determining an optical cable segment having an optical cable segment whose received optical power does not meet the requirement as a faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of an optical transceiver connected to the optical cable segment; and / or,

[0303] Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment; and / or,

[0304] Whether a maintenance signal reflecting a fault appears in each optical cable segment among n optical cables, and the optical cable where the optical cable segment appears the maintenance signal is determined as a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that an optical transceiver connected to the optical cable segment appears a maintenance signal reflecting the fault.

[0305] The above method can be applied to the receiving end of an n-transmitting n-receiving client-side protection optical transmission system. For details and technical effects of each step in the optical signal transmission method executed by the receiving end, please refer to the introduction of the above related embodiments.

[0306] Figure 9 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present application. Figure 9 As shown, the computer device includes: a memory 91 and a processor 92;

[0307] The memory 91 is used to store computer programs and can be configured to store various other data to support operations on the computing platform. Examples of such data include instructions for any application or method operating on the computing platform, contact data, phone book data, messages, pictures, videos, etc.

[0308] The memory 91 can be implemented by any type of volatile or non-volatile memory device or a combination thereof, such as static random-access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0309] The processor 92 is coupled to the memory 91 and is configured to execute the computer program in the memory 91 to perform the steps in the above optical signal transmission method.

[0310] Further optional, such as Figure 9 As shown, the computer device also includes: a communication component 93, a display 94, a power component 95, an audio component 96 and other components. Figure 9 Only some components are shown schematically, which does not mean that the computer equipment only includes Figure 9 In addition, Figure 9 The components in the dotted box are optional components, not mandatory components, and the specific components may depend on the product form of the computer device. The computer device of this embodiment can be implemented as a terminal device such as a desktop computer, a laptop computer, a smart phone or an IOT (Internet of Things) device, or a server device such as a conventional server, a cloud server or a server array. If the computer device of this embodiment is implemented as a terminal device such as a desktop computer, a laptop computer, a smart phone, etc., it may include Figure 9 If the computer device of this embodiment is implemented as a server device such as a conventional server, a cloud server or a server array, it may not include the components in the dotted box; Figure 9 Components within the dotted box.

[0311] The detailed implementation process of the processor executing each action can be found in the relevant description in the aforementioned method embodiment or device embodiment, and will not be repeated here.

[0312] Accordingly, an embodiment of the present application further provides a computer-readable storage medium storing a computer program, which, when executed, can implement the steps that can be executed by a computer device in the above method embodiment.

[0313] Accordingly, an embodiment of the present application also provides a computer program product, including a computer program / instruction. When the computer program / instruction is executed by a processor, the processor is enabled to implement the steps that can be executed by a computer device in the above method embodiment.

[0314] The above-mentioned communication component is configured to facilitate wired or wireless communication between the device where the communication component is located and other devices. The device where the communication component is located can access a wireless network based on a communication standard, such as WiFi (Wireless Fidelity), 2G (2 Generation, 2 Generation), 3G (3 Generation, 3 Generation), 4G (4 Generation, 4 Generation) / LTE (Long Term Evolution), 5G (5 Generation, 5 Generation) and other mobile communication networks, or a combination thereof. In an exemplary embodiment, the communication component receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wide band (UWB) technology, Bluetooth (BT) technology and other technologies.

[0315] The display includes a screen, which may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, slides, and gestures on the touch panel. The touch sensor may not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.

[0316] The power supply assembly provides power to various components of the device in which the power supply assembly is located. The power supply assembly may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the device in which the power supply assembly is located.

[0317] The above-mentioned audio component can be configured to output and / or input audio signals. For example, the audio component includes a microphone (MIC), and when the device where the audio component is located is in an operating mode, such as call mode, recording mode, and voice recognition mode, the microphone is configured to receive external audio signals. The received audio signal can be further stored in a memory or sent via a communication component. In some embodiments, the audio component also includes a speaker for outputting audio signals.

[0318] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0319] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0320] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0321] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0322] In a typical configuration, a computing device includes one or more processors (Central Processing Unit, CPU), input / output interfaces, network interfaces, and memory.

[0323] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0324] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, Phase Change RAM (PRAM), Static Random-Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically-Erasable Programmable Read-Only Memory (EEPROM), flash memory or other memory technology, CD-ROM, Digital Versatile Disc (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device. According to the definition in this article, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0325] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0326] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. An n-transmit n-receive optical multiplex section protection system, characterized in that: include: A first device and a second device; each of the first device and the second device includes a plurality of optical transceivers, n combiners, n splitters, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the optical transceivers are connected to the input port of the first optical switch via the combiner, and the output port of the second optical switch is connected to the optical transceiver via the splitter; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables, and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; one of the first device and the second device is a transmitter, and the other is a receiver; The transmitting end is configured to receive a plurality of optical signals of different priorities through a plurality of optical transceivers, combine the plurality of optical signals of different priorities into n optical signals of different priorities through n combiners, and respectively transmit the n optical signals of different priorities to n optical cables through a first optical switch in the transmitting end; The receiving end is configured to receive n optical signals from n optical cables via a second optical switch in the receiving end, split the n optical signals of different priorities into multiple optical signals via n splitters, and output the multiple optical signals externally via multiple optical transceivers; Fault detection is performed on n optical cables; if a faulty optical cable is detected and the priority of an optical signal transmitted by the faulty optical cable before the fault is higher than the priority of an optical signal transmitted by a normal optical cable, a first optical switch in a transmitting end and a second optical switch in a receiving end are controlled to switch optical paths so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

2. The system according to claim 1, wherein: The receiving end is specifically used for fault detection when: detecting the received optical powers of n input ports of the second optical switch at the receiving end; If the second optical switch at the receiving end has a target input port whose received optical power does not meet the requirement, the optical cable connected to the target input port is determined to be a faulty optical cable.

3. The system according to claim 1, wherein: The first device and the second device further include n transmitters and n receivers, the n transmitters in the first device are connected to the n receivers in the second device via n first optical cables, and the n transmitters in the second device are connected to the n receivers in the first device via n second optical cables; Accordingly, when the receiving end performs fault detection, it is specifically used to: Detect the received optical power of n receivers at the receiving end; If there is a target receiver among the n receivers in the receiving end whose received optical power does not meet the requirement, the optical cable connected to the target receiver is determined to be a faulty optical cable; and / or, Control the n receivers at the receiving end to respectively establish handshake connections with the n transmitters at the sending end; If there is a target receiver whose handshake fails among the n receivers in the receiving end, the optical cable connected to the target receiver is determined to be a faulty optical cable.

4. The system according to any one of claims 1 to 3, characterized in that When the receiving end controls the first optical switch in the transmitting end and the second optical switch in the receiving end to switch the optical path, the receiving end is specifically used to: Controlling the second optical switch at the receiving end to switch the output port connected to the input port connected to the faulty optical cable and the input port connected to the normal optical cable, and sending a switching instruction to the transmitting end; The switching instruction is used to control the switching of the input ports connected between the output port connected to the faulty optical cable and the output port connected to the normal optical cable in the first optical switch at the transmitting end.

5. The system according to claim 4, characterized in that The receiving end is further configured to prohibit controlling the first optical switch in the transmitting end and the second optical switch in the receiving end from switching optical paths if the priority of the optical signal transmitted by the faulty optical cable before the fault is lower than the priority of the optical signal transmitted by the normal optical cable.

6. An n-transmit n-receive optical channel protection system, characterized in that: include: a first device and a second device; each of the first device and the second device includes n optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the optical transceiver is connected to an input port of the first optical switch, and the output port of the second optical switch is connected to the optical transceiver; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables, and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; A combiner is further provided between the output port of the first optical switch in the first device and the first optical cable, and a demultiplexer is further provided between the first optical cable and the input port of the second optical switch in the second device; a combiner is further provided between the output port of the first optical switch in the second device and the second optical cable, and a demultiplexer is further provided between the second optical cable and the input port of the second optical switch in the second device; One of the first device and the second device is a transmitting end, and the other is a receiving end; The transmitting end is configured to receive n optical signals of different priorities through n optical transceivers, and to send the n optical signals of different priorities to n optical cables respectively through the first optical switch and n combiners in the transmitting end; The receiving end is used to receive n optical signals from n optical cables through n wave splitters and a second optical switch in the receiving end, and output the n optical signals to the outside through n optical transceivers; Fault detection is performed on n optical cables; if a faulty optical cable is detected and the priority of an optical signal transmitted by the faulty optical cable before the fault is higher than the priority of an optical signal transmitted by a normal optical cable, a first optical switch in a transmitting end and a second optical switch in a receiving end are controlled to switch optical paths so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

7. The system according to claim 6, characterized in that When the receiving end performs fault detection on n optical cables, it is specifically used to: detecting the received optical powers of n input ports of the second optical switch at the receiving end; if there is a target input port in the second optical switch at the receiving end whose received optical power does not meet the requirement, determining the optical cable connected to the target input port as a faulty optical cable; or, detecting the received optical power of n optical cables, wherein the received optical power of the optical cables refers to the received optical power of an optical transceiver at a receiving end connected to the optical cables via a second optical switch; if any of the n optical cables has an optical cable whose received optical power does not meet the requirement, determining the optical cable whose received optical power does not meet the requirement as a faulty optical cable; or detecting bit error rates of n optical cables, wherein the bit error rates of the optical cables refer to the bit error rates of optical transceivers at a receiving end connected to the optical cables via a second optical switch; if any of the n optical cables has a bit error rate that does not meet the requirement, determining the optical cable with the bit error rate that does not meet the requirement as a faulty optical cable; or Detecting whether maintenance signals reflecting a fault appear on n optical cables, and determining an optical cable that appears the maintenance signal as a faulty optical cable, wherein the maintenance signal reflecting the fault appears on the optical cable refers to the maintenance signal reflecting the fault appearing on an optical transceiver at a receiving end connected to the optical cable via a second optical switch.

8. The system according to claim 6, wherein: At least one optical transceiver is provided on the first optical cable and the second optical cable, and the first optical cable and the second optical cable include a plurality of optical cable segments; The receiving end is specifically used for fault detection when: detecting the received optical power of each optical cable segment among n optical cables, and determining an optical cable segment having an optical cable segment whose received optical power does not meet the requirement as a faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of an optical transceiver connected to the optical cable segment; and / or, Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment; and / or, Whether a maintenance signal reflecting a fault appears in each optical cable segment among n optical cables, and the optical cable where the optical cable segment appears the maintenance signal is determined as a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that an optical transceiver connected to the optical cable segment appears a maintenance signal reflecting the fault.

9. A n-send n-receive subnet connection protection system, characterized in that: include: A first device and a second device; each of the first device and the second device includes a switch, n combiners, n splitters, and an optical receiver, where n is a positive integer greater than 1, and the optical receiver includes a client-side port and a line-side port; the switch and the client-side port of the optical receiver are connected, the n line-side first ports of the optical receiver in the first device are connected to the n line-side second ports of the optical receiver in the second device via n first optical cables, and the n line-side first ports of the optical receiver in the second device are connected to the n line-side second ports of the optical receiver in the first device via n second optical cables; one of the first device and the second device is a transmitter, and the other is a receiver; The transmitting end is used to receive n optical signals of different priorities through a switch, and send the n optical signals of different priorities to n optical cables respectively through an optical receiver and n combiners in the transmitter; The receiving end is used to receive n optical signals from n optical cables through n splitters and an optical receiver in the receiving end, and output the n optical signals to the outside through a switch; Fault detection is performed on n optical cables; if a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the optical receiver in the transmitting end and the optical receiver in the receiving end are controlled to perform an electrical cross-link operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

10. The system according to claim 9, characterized in that At least one optical transceiver is provided on the first optical cable and the second optical cable, and the first optical cable and the second optical cable include a plurality of optical cable segments; The receiving end is specifically used for fault detection when: detecting the received optical power of each optical cable segment among n optical cables, and determining an optical cable segment having an optical cable segment whose received optical power does not meet the requirement as a faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of an optical transceiver connected to the optical cable segment; and / or, Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment; and / or, Whether a maintenance signal reflecting a fault appears in each optical cable segment among n optical cables, and the optical cable where the optical cable segment appears the maintenance signal is determined as a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that an optical transceiver connected to the optical cable segment appears a maintenance signal reflecting the fault.

11. A client-side protection optical transmission system with n-transmit and n-receive features, include: a first device and a second device; each of the first device and the second device includes n switches, n optical transceivers, n combiners, n demultiplexers, an n×n first optical switch, and an n×n second optical switch, where n is a positive integer greater than 1; the switches are connected to the first optical switch and the second optical switch, respectively; the n output ports of the first optical switch in the first device are connected to the n input ports of the second optical switch in the second device via n first optical cables; and the n output ports of the first optical switch in the second device are connected to the n input ports of the second optical switch in the first device via n second optical cables; The output port of the first optical switch is connected to an optical cable via an optical transceiver and a combiner, and the optical cable is connected to the input port of the second optical switch via a demultiplexer and an optical transceiver; one of the first device and the second device is a transmitting end, and the other is a receiving end; The transmitting end is used to receive n optical signals of different priorities through the switch, and send the n optical signals of different priorities to n optical cables respectively through the first optical switch, n optical transceivers, and n combiners in the transmitting end; The receiving end is used to receive n optical signals from n optical cables through n wave splitters, n optical receivers and a second optical switch in the receiving end, and output the n optical signals to the outside through the switch; Fault detection is performed on n optical cables; if a faulty optical cable is detected and the priority of an optical signal transmitted by the faulty optical cable before the fault is higher than the priority of an optical signal transmitted by a normal optical cable, a first optical switch in a transmitting end and a second optical switch in a receiving end are controlled to switch optical paths so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

12. The system according to claim 11, characterized in that At least one optical transceiver is provided on the first optical cable and the second optical cable, and the first optical cable and the second optical cable include a plurality of optical cable segments; The receiving end is specifically used for fault detection when: detecting the received optical power of each optical cable segment among n optical cables, and determining an optical cable segment having an optical cable segment whose received optical power does not meet the requirement as a faulty optical cable, wherein the received optical power of the optical cable segment refers to the received optical power of an optical transceiver connected to the optical cable segment; and / or, Detecting the bit error rate of each optical cable segment among n optical cables; determining the optical cable segment having a bit error rate that does not meet the requirement as a faulty optical cable, wherein the bit error rate of the optical cable segment refers to the bit error rate of the optical transceiver connected to the optical cable segment; and / or, Whether a maintenance signal reflecting a fault appears in each optical cable segment among n optical cables, and the optical cable where the optical cable segment appears the maintenance signal is determined as a faulty optical cable, wherein the maintenance signal reflecting the fault appears in the optical cable segment means that an optical transceiver connected to the optical cable segment appears a maintenance signal reflecting the fault.

13. A method for transmitting an optical signal, characterized in that: Applied to a transmitting end, the method includes: receiving a plurality of optical signals of different priorities by means of a plurality of optical transceivers in the transmitting end, combining the plurality of optical signals of different priorities into n optical signals of different priorities by means of n combiners, and respectively sending the n optical signals of different priorities to n optical cables by means of a first optical switch in the transmitting end; In response to a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end is controlled to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

14. A method for transmitting an optical signal, characterized in that: Applied to a receiving end, the method includes: receiving n optical signals from n optical cables through a second optical switch at the receiving end, dividing the n optical signals of different priorities into multiple optical signals through n splitters, and outputting the multiple optical signals externally through multiple optical transceivers; Perform fault detection on n optical cables; If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the second optical switch in the receiving end is controlled to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

15. A method for transmitting an optical signal, characterized in that: Applied to a transmitting end, the method includes: Receiving n optical signals of different priorities through n optical transceivers in the transmitting end, and sending the n optical signals of different priorities to n optical cables respectively through a first optical switch and n combiners in the transmitting end; In response to a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end is controlled to perform optical path switching so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

16. A method for transmitting an optical signal, characterized in that: Applied to a receiving end, the method includes: receiving n optical signals from n optical cables through n wave splitters and a second optical switch at the receiving end, and outputting the n optical signals to the outside through n optical transceivers; Perform fault detection on n optical cables; If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the second optical switch in the receiving end is controlled to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

17. A method for transmitting an optical signal, characterized in that: Applied to a transmitting end, the method includes: The switch in the transmitter receives n optical signals of different priorities, and the optical receiver and n combiners in the transmitter send the n optical signals of different priorities to n optical cables respectively; In response to a faulty optical cable appearing among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the optical receiver in the transmitting end is controlled to perform an electrical cross-operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

18. A method for transmitting an optical signal, characterized in that: Applied to a receiving end, the method includes: Receive n optical signals from n optical cables through n splitters and the optical receiver at the receiving end, and output the n optical signals to the outside through the switch; Perform fault detection on n optical cables; If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the optical receiver in the receiving end is controlled to perform an electrical cross-connection operation so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

19. A method for transmitting an optical signal, characterized in that: Applied to a transmitting end, the method includes: The switch receives n optical signals of different priorities, and transmits the n optical signals of different priorities to n optical cables respectively through the first optical switch, n optical transceivers, and n combiners in the transmitting end; In response to a faulty optical cable among the n optical cables, and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the first optical switch in the transmitting end is controlled to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

20. A method for transmitting an optical signal, characterized in that: Applied to a receiving end, the method includes: Receive n optical signals from n optical cables through n wave splitters, n optical receivers and a second optical switch at the receiving end, and output the n optical signals to the outside through the switch; Perform fault detection on n optical cables; If a faulty optical cable is detected and the priority of the optical signal transmitted by the faulty optical cable before the fault is higher than the priority of the optical signal transmitted by the normal optical cable, the second optical switch in the receiving end is controlled to switch the optical path so that the optical signal transmitted by the faulty optical cable before the fault is transmitted by the normal optical cable.

21. A computer device, characterized in that: include: memory and processor; The memory is used to store computer programs; The processor is coupled to the memory and configured to execute the computer program to perform the steps of the method according to any one of claims 13 to 20.

22. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the processor is enabled to implement the steps of the method according to any one of claims 13 to 20.

23. A computer program product, characterized in that The method comprises a computer program / instruction, which, when executed by a processor, causes the processor to implement the steps of the method according to any one of claims 13 to 20.

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