CN115842778A

CN115842778A - Optical communication system, dual-homing protection method and communication system

Info

Publication number: CN115842778A
Application number: CN202110918933.9A
Authority: CN
Inventors: 黄康勇; 宋家军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2023-03-24

Abstract

The present application relates to the field of optical communications, and in particular, to an optical communication system, a dual homing protection method, and a communication system. The optical communication system comprises a dual-homing protection device, a first optical communication device, a second optical communication device and a third optical communication device. The dual-return protection device is connected with the first optical communication device through the first optical fiber and the second optical fiber, the dual-return protection device is connected with the second optical communication device through the third optical fiber, and the dual-return protection device is connected with the third optical communication device through the fourth optical fiber. The dual-homing protection device may establish an optical path between the first optical fiber and the fourth optical fiber, or between the second optical fiber and the third optical fiber or the fourth optical fiber upon detection of a failure in one or more of the first optical fiber, the third optical fiber, the second optical communication device. By adopting the optical communication system and the dual-homing protection method provided by the application, the reliability of the forward network and the private network can be improved.

Description

Optical communication system, dual-homing protection method and communication system

Technical Field

The present application relates to the field of communications technologies, and in particular, to an optical communication system, a dual homing protection method, and a communication system.

Background

With the continuous development of optical communication technology, fronthaul (i.e., frontaul) networks or private network networks implemented based on optical network architectures are gradually popularized. The fronthaul network implements service data transmission between a remote device (e.g., a Radio Remote Unit (RRU) or an Active Antenna Unit (AAU)) and a local device (e.g., a baseband unit (BBU) or a Distributed Unit (DU)). A private network implements service data transmission between a remote device (e.g., a Customer Premises Equipment (CPE)) and a local device (e.g., a cloud of presence (POP) device). Due to the importance of the forward-haul network or the private network, people are increasingly concerned about the reliability and the practicability of the optical communication system adopted by the forward-haul network or the private network.

In an optical communication system of an existing forward network or a private line network, a main/standby switching mechanism is mainly formed by two main optical fibers between a remote device and a local device, so that protection for the main optical fibers is realized. However, the existing forward network or private network can only implement single-homing protection for the trunk fiber, and cannot implement redundancy protection for the side of the local equipment. Once the local side device fails, all services between the remote device and the local side device are interrupted. Therefore, the reliability of the current forwarding network or the private network is poor.

Disclosure of Invention

Therefore, the optical communication system, the dual-homing protection method and the communication system can achieve dual-homing protection for the trunk optical fiber and the local-end equipment in the forward network or the private network, and can improve the reliability of the forward network or the private network.

In a first aspect, an embodiment of the present application provides an optical communication system. The optical communication system comprises a dual-homing protection device, a first optical communication device, a second optical communication device, a third optical communication device, a first optical fiber, a second optical fiber, a third optical fiber and a fourth optical fiber. The dual-homing protection device is connected with the first optical communication device through the first optical fiber and the second optical fiber. The dual-return protection device is connected with the second optical communication device through the third optical fiber, and the dual-return protection device is connected with the third optical communication device through the fourth optical fiber. The dual-homing protection device is used for establishing an optical path between the first optical fiber and a fourth optical fiber or between the second optical fiber and the third optical fiber or the fourth optical fiber when one or more of the first optical fiber, the third optical fiber and the second optical communication device is/are detected to be in failure, so that signal light is transmitted between the first optical communication device and the second optical communication device or the third optical communication device.

It should be understood that in the above optical communication system, a spare portion is provided for each of the first optical fiber and the second optical communication device connected by the third optical fiber. For example, the first optical fiber is provided with a spare second optical fiber and the third optical fiber is provided with a spare fourth optical fiber. The second optical communication device is also provided with a spare third optical communication device. Therefore, as long as the dual-homing protection device detects that one or more of the first optical fiber, the third optical fiber and the second optical communication device is failed, the failed optical fiber or the optical communication device can be switched to the spare part thereof. Therefore, the optical communication system can realize dual-homing protection for the second optical fiber and the second optical communication device through the dual-homing protection device. The optical communication system is applied to the forward network or the private network, so that the forward network or the private network can realize dual-homing protection for the trunk optical fiber and the local-side equipment, and the reliability of the forward network or the private network can be improved.

With reference to the first aspect, in one possible implementation manner, the dual homing protection device includes: the optical coupler comprises a first optical coupler, a second optical coupler, a third optical coupler, a fourth optical coupler, a first optical switch group, a second optical switch group, a first controller and a second controller, wherein the first optical coupler is respectively connected with the first controller and the first optical switch group, the first controller is respectively connected with the first optical switch group and the third optical coupler, the first optical switch group is also connected with the second optical switch group, the second optical switch group is respectively connected with the second optical coupler, the second controller and the fourth optical coupler, the second controller is respectively connected with the second optical coupler and the fourth optical coupler, the first controller is connected with the second controller, the first optical coupler is connected with the first optical communication device through the first optical fiber, the second optical coupler is connected with the first optical communication device through the second optical fiber, the third optical coupler is connected with the second optical communication device through the third optical fiber, and the fourth optical communication device through the third optical fiber.

With reference to the first aspect, in a possible implementation manner, the signal light further includes fourth signal light that is sent to the first optical coupler through the first optical fiber. The first optical coupler is configured to split light according to the fourth signal light to obtain seventh sub-signal light and eighth sub-signal light, transmit the seventh sub-signal light to the first controller, and transmit the eighth sub-signal light to the first optical switch group. The first controller is configured to determine that the first optical fiber has a fault when it is determined that the optical power of the seventh sub-signal light is zero, or it is determined that a second optical power difference between the optical power of the seventh sub-signal light and a second preset optical power is equal to or greater than a second preset difference. The first controller judges whether the first optical fiber breaks down or not in a light power detection mode, the mode is simple and easy to realize, and the structural complexity and the cost of the double-return protection device can be reduced.

With reference to the first aspect, in a possible implementation manner, the signal light further includes first signal light transmitted to the third optical coupler through the third optical fiber. The third optical coupler is used for obtaining first sub-signal light and second sub-signal light according to the first signal light, transmitting the first sub-signal light to the first controller, and transmitting the second sub-signal light to the first optical switch group. The first controller is configured to determine that the third optical fiber has a fault when it is determined that the optical power of the first sub-signal light is zero, or it is determined that a first optical power difference between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference. The second controller also judges whether the second optical fiber has a fault or not in a light power detection mode, so that the structural complexity and the cost of the dual-return protection device can be further reduced.

With reference to the first aspect, in a possible implementation manner, the first controller is further configured to determine whether the first sub-signal light includes a target set-top signal when it is determined that the first optical power difference is smaller than the first preset difference. Wherein the target tune-top signal is a tune-top signal pre-configured by the first signal light. And if the first sub-signal light is determined not to contain the target tuning signal, determining that the second optical communication device has a fault. The first controller judges whether the third optical fiber is in fault or not by detecting optical power, and further judges whether the second optical communication device is in fault or not by detecting whether the first sub-signal light contains the target tuning signal or not under the condition that the third optical fiber is determined to be in fault, so that fault detection aiming at the third optical fiber and a pure optical layer of the second optical communication device can be realized.

With reference to the first aspect, in a possible implementation manner, the signal light further includes second signal light sent to the second optical coupler through the second optical fiber, and third signal light sent to the fourth optical coupler through the fourth optical fiber. The second optical coupler is configured to split the second signal light to obtain a third sub-signal light and a fourth sub-signal light, transmit the third sub-signal light to the second controller, and transmit the fourth sub-signal light to the second optical switch group. The fourth optical coupler is configured to split light according to the third signal light to obtain fifth sub-signal light and sixth sub-signal light, transmit the fifth sub-signal light to the second controller, and transmit the sixth sub-signal light to the second optical switch group. The second controller is used for determining whether the second optical fiber is in failure according to the third sub-signal light. The second controller is further configured to determine whether the fourth optical fiber and/or the third optical communication device is malfunctioning according to the fifth sub-signal light.

With reference to the first aspect, in a possible implementation manner, the first controller is configured to control the first optical switch group to establish an optical path between the second optical switch group and the third optical coupler and send first indication information to the second controller, when it is determined that the first optical fiber is faulty and the third optical fiber and the second optical communication device are not faulty. The second controller is configured to receive the first indication information, and control the second optical switch group to establish an optical path between the second optical coupler and the first optical switch group when it is determined that the second optical fiber is not faulty, so as to transmit the fourth sub-signal light to the second optical communication device through the third optical fiber and transmit the second sub-signal light to the first optical communication device through the second optical fiber. When the dual-homing protection device determines that the first optical fiber fails and the third optical fiber and the second optical communication device do not fail, the second optical fiber can replace the first optical fiber to transmit corresponding service data, so that the optical communication system can realize fault protection for the first optical fiber.

With reference to the first aspect, in a possible implementation manner, the first controller is configured to control the first optical switch group to establish an optical path between the first optical coupler and the second optical switch group and send second indication information to the second controller, when it is determined that the first optical fiber is not faulty and the third optical fiber and/or the second optical communication device is faulty. The second controller is configured to receive the second indication information, and control the second optical switch group to establish an optical path between the first optical switch group and the fourth optical coupler under the condition that it is determined that the fourth optical fiber and the third optical communication device are not faulty, so as to transmit the sub-signal light provided by the first optical coupler to the third optical communication device through the fourth optical fiber, and transmit the sixth sub-signal light to the first optical communication device through the first optical fiber. When the dual-homing protection device determines that the first optical fiber is not in fault and the third optical fiber and/or the second optical communication device is in fault, corresponding service data can be transmitted by the spare fourth optical fiber and the spare third optical communication device instead of the third optical fiber and the second optical communication device, so that the optical communication system can also realize fault protection for the third optical fiber and the second optical communication device.

With reference to the first aspect, in a possible implementation manner, the first controller is configured to send third indication information to the second controller when it is determined that the first optical fiber and the third optical fiber, or the first optical fiber, the third optical fiber, and the second optical communication device all have a fault. The second controller is configured to receive the third indication information, and, in a case where it is determined that none of the second optical fiber, the fourth optical fiber, and the third optical communication device is faulty, control the second optical switch group to establish an optical path between the second optical coupler and the fourth optical coupler, so as to transmit the fourth sub-signal light to the third optical communication device through the fourth optical fiber, and transmit the sixth sub-signal light to the first optical communication device through the second optical fiber.

With reference to the first aspect, in a possible implementation manner, in a case that it is determined that the first optical fiber and the second optical fiber are in failure, the second controller is configured to output service interruption warning information, where the service interruption warning information is used to indicate that service interruption occurs between the first optical communication device and the second optical communication device and the third optical communication device.

With reference to the first aspect, in one possible implementation manner, the second optical communication device includes a first multiplexer/demultiplexer, N first branch optical fibers, and N first optical transceivers. Each first optical transceiver is connected with the third optical fiber through a branch optical fiber and the first multiplexer/demultiplexer, and N is a positive integer greater than or equal to 2. The N first optical transceivers are used for generating N first branch signal lights and respectively transmitting the N first branch signal lights to the first multiplexer/demultiplexer through the N first branch optical fibers. Each of the N first branch signal lights is preconfigured with a first branch set-top signal. The first multiplexer/demultiplexer is configured to combine the N first branch signal lights to obtain a first signal light, and transmit the first signal light to the third optical coupler through the third optical fiber. The third optical coupler is used for splitting light according to the first signal light to obtain first sub-signal light and sending the first sub-signal light to the first controller. The first controller is further configured to determine whether the first sub-signal light includes a first branch pilot signal corresponding to each of the N first branch signal lights, when it is determined that the first optical power difference is smaller than the first preset difference. If the first controller determines that the first sub-signal light does not include a first branch set-top signal preconfigured by M first branch signal lights of the N first branch signal lights, it is determined that M first optical transceivers for generating the M first branch signal lights have a failure. Wherein M is a positive integer greater than or equal to 1.

With reference to the first aspect, in a feasible implementation manner, the third optical communication device includes a second multiplexer/demultiplexer, N second tributary optical fibers, and N second optical transceivers, each second optical transceiver is connected to the fourth optical fiber through one second tributary optical fiber and the second multiplexer/demultiplexer, and the N first optical transceivers and the N second optical transceivers are in one-to-one correspondence. The first controller is used for controlling the first optical switch group to establish an optical path between the first optical coupler and the second optical switch group and sending fourth indication information to the second controller under the condition that the M first optical transceivers are determined to be in fault. The second controller is configured to receive the fourth indication information, and control the second optical switch group to establish an optical path between the second optical fiber and the fourth optical fiber when it is determined that the second optical fiber, the fourth optical fiber, and the third optical communication device are not faulty, so as to replace the faulty M first optical transceivers with M second optical transceivers among the N second optical transceivers corresponding to the M first optical transceivers to perform transmission of corresponding signal light.

In the foregoing implementation, when M first optical transceivers in the second optical communication device fail, the dual-homing protection device may switch transmission traffic carried by the failed M first optical transceivers to corresponding M second optical transceivers in the third optical communication device. In this way, protection of one or more optical transceivers in the second optical communication device can be achieved, and the diversity of functions of the optical communication system can be improved.

With reference to the first aspect, in a possible implementation manner, the fourth indication information at least includes first identification information corresponding to the M first optical transceivers and fault status information corresponding to the multiple first optical transceivers, where the fault status information is used to indicate a fault status, and the first controller is further connected to the second optical communication device. The first controller is further configured to send the fourth indication information to the second optical communication device to notify the second optical communication device that the M first optical transceivers have failed.

With reference to the first aspect, in a possible implementation manner, the second controller is further connected to the third optical communication device. The third optical communication device is configured to send second switching completion indication information to the second controller after determining that the M second optical transceivers start to perform transmission of corresponding first branch signal light instead of the M first optical transceivers. The second switching completion indication information at least includes second identification information corresponding to the M second optical transceivers and non-fault status information corresponding to the M second optical transceivers, where the non-fault status information is used to indicate a non-fault status.

The second controller is further configured to forward the second handover completion indication information to the first controller and/or the second optical communication apparatus.

With reference to the first aspect, in a possible implementation manner, the optical communication system further includes a fourth optical communication device, a fifth optical communication device, a sixth optical communication device, a fifth optical fiber, a sixth optical fiber, a seventh optical fiber, and an eighth optical fiber, and the dual homing protection device further includes a fifth optical coupler, a sixth optical coupler, a seventh optical coupler, and an eighth optical coupler. The fourth optical communication device is connected to the fifth optical coupler through the fifth optical fiber. The fourth optical communication device is further connected to the sixth optical coupler through the sixth optical fiber. The fifth optical coupler is also respectively connected with the first controller and the first optical switch group. The sixth optical coupler is also respectively connected with the second controller and the second optical switch group. The fifth optical communication device is connected to the seventh optical coupler through the seventh optical fiber, and the seventh optical coupler is respectively connected to the first controller and the first optical switch group. The sixth optical communication device is connected with the eighth optical coupler through an eighth optical fiber, and the eighth optical coupler is further connected with the second controller and the second optical switch group respectively. The first optical switch group is connected with the second optical switch group through a ninth optical fiber.

With reference to the first aspect, in one possible implementation manner, the first controller is configured to, in a case that it is determined that the first optical fiber is faulty and the third optical fiber and the second optical communication device are not faulty, control, with reference to the second controller, the first optical switch group and the second optical switch group to establish the first optical path between the second optical coupler and the third optical coupler. Wherein the first optical path passes through the ninth optical fiber. The first controller is further configured to send fifth indication information to the second controller when it is determined that the fifth optical fiber has a failure according to the sub-signal light provided by the fifth optical coupler and it is determined that the seventh optical fiber and the fifth optical communication device have no failure according to the sub-signal light provided by the seventh optical coupler. The second controller is configured to receive the fifth indication information, and control the second optical switch group to establish a second optical path between the second optical coupler and the fourth optical coupler when it is determined that the second optical fiber, the fourth optical fiber, and the third optical communication device are not faulty, so as to complete transmission of signal light between the second optical communication device and the first optical communication device by using the third optical communication device instead of the second optical communication device. The third optical communication device is configured to send first handover completion indication information to the first controller and the second controller after determining to completely replace the second optical communication device. And after the first controller and the second controller both receive the first switching completion indication information, the first controller controls the first optical switch group and the second optical switch group to disconnect the first optical path by combining with the second controller.

With reference to the first aspect, in a possible implementation manner, after the first optical path is disconnected, the first controller is further configured to control the first optical switch group to establish an optical path between the seventh optical coupler and the second optical switch group, and send sixth indication information to the second controller. The second controller is configured to receive the sixth indication information, and control the second optical switch group to establish an optical path between the sixth optical coupler and the first optical switch group when it is determined that the seventh optical fiber is not faulty, so that an optical path is established between the fourth optical communication device and the fifth optical communication device through the sixth optical fiber, the ninth optical fiber and the seventh optical fiber. In the optical communication system, the optical communication system comprises a plurality of main paths and standby paths, and under the condition that the main paths and the standby paths share the double-return protection device, the double-return protection device can release the occupied shared ninth optical fiber by completely switching the first main path which fails firstly to the corresponding first standby path, and then further control the second main path which fails later to switch to the second standby path, so that the problem that the fault protection cannot be provided for the main paths simultaneously due to the fact that the ninth optical fiber is occupied can be effectively solved, and the practicability of the optical communication system can be further improved.

In a second aspect, an embodiment of the present application provides a dual homing protection method. The dual homing protection method is applied to the optical communication system provided by the first aspect. The optical communication system comprises a double-return protection device, a first optical communication device, a second optical communication device, a third optical communication device, a first optical fiber, a second optical fiber, a third optical fiber and a fourth optical fiber, wherein the double-return protection device is connected with the first optical communication device through the first optical fiber and the second optical fiber, the double-return protection device is connected with the second optical communication device through the third optical fiber, and the double-return protection device is connected with the third optical communication device through the fourth optical fiber. The method includes detecting, by the dual homing protection device, whether one or more of the first optical fiber, the third optical fiber, the second optical communication device is malfunctioning. When one or more of the first optical fiber, the third optical fiber and the second optical communication device is determined to be in fault through a dual-homing protection device, an optical path is established between the first optical fiber and a fourth optical fiber or between the second optical fiber and the third optical fiber or the fourth optical fiber through the dual-homing protection device, so that signal light is transmitted between the first optical communication device and the second optical communication device or the third optical communication device.

It should be understood that, in the implementation described above, based on the optical communication system provided in the first aspect, as long as the dual-homing protection device detects that one or more of the first optical fiber, the third optical fiber, and the second optical communication device has failed, the failed optical fiber or the optical communication device may be switched to its spare portion. Therefore, the dual-homing protection for the second optical fiber and the second optical communication device can be realized by the dual-homing protection method in the optical communication system. Therefore, the method and the optical communication system are applied to the forward network or the private network, so that the forward network or the private network can realize dual-homing protection on the trunk optical fiber and the local-side equipment, and the reliability of the forward network or the private network can be improved.

With reference to the second aspect, in a possible implementation manner, the dual-homing protection device includes a first optical coupler, a second optical coupler, a third optical coupler, a fourth optical coupler, a first optical switch group, a second optical switch group, a first controller and a second controller, where the first optical coupler is connected to the first controller and the first optical switch group, the first controller is further connected to the first optical switch group and the third optical coupler, the first optical switch group is further connected to the second optical switch group, the second optical switch group is further connected to the second optical coupler, the second controller and the fourth optical coupler, the second controller is further connected to the second optical coupler and the fourth optical coupler, the first controller is connected to the second controller, the first optical coupler is connected to the first optical communication device through the first optical fiber, the second optical coupler is connected to the first optical communication device through the second optical fiber, the third optical coupler is connected to the fourth optical communication device through the second optical fiber, and the third optical communication device is connected to the fourth optical coupler through the third optical fiber.

With reference to the second aspect, in a possible implementation manner, the signal light further includes first signal light transmitted to the third optical coupler through the third optical fiber. The first signal light may be split by the third optical coupler to obtain first sub-signal light and second sub-signal light. The first sub-signal light may be transmitted to the first controller through the third optical coupler, and the second sub-signal light may be transmitted to the first optical switch group. And when the first controller determines that the optical power of the first sub-signal light is zero or determines that a first optical power difference value between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference value, determining that the third optical fiber has a fault.

With reference to the second aspect, in a possible implementation manner, when it is determined by the first controller that the first optical power difference is smaller than the first preset difference, determining, by the first controller, whether the first sub-signal light includes a target set-top signal, where the target set-top signal is a set-top signal preconfigured for the first signal light. And if the first controller determines that the first sub-signal light does not contain the target set-top signal, determining that the second optical communication device has a fault.

With reference to the second aspect, in a possible implementation manner, the signal light further includes fourth signal light transmitted to the first optical coupler through the first optical fiber. The first optical coupler may split the fourth signal light to obtain a seventh sub-signal light and an eighth sub-signal light, and transmit the seventh sub-signal light to the first controller and the eighth sub-signal light to the first optical switch group. And when the optical power of the seventh sub-signal light is determined to be zero by the first controller, or a second optical power difference value between the optical power of the seventh sub-signal light and a second preset optical power is determined to be equal to or greater than a second preset difference value, determining that the first optical fiber has a fault.

With reference to the second aspect, in a possible implementation manner, the signal light further includes second signal light that is sent by the first optical communication device to the second optical coupler through the second optical fiber, and third signal light that is sent by the third optical communication device to the fourth optical coupler through the fourth optical fiber. The second optical coupler may split the second signal light to obtain third sub-signal light and fourth sub-signal light, and the third sub-signal light is transmitted to the second controller, and the fourth sub-signal light is transmitted to the second optical switch group. The fourth optical coupler may split the third signal light to obtain fifth sub-signal light and sixth sub-signal light, and the fifth sub-signal light is transmitted to the second controller, and the sixth sub-signal light is transmitted to the second optical switch group. Whether the second optical fiber is failed or not may be determined from the third sub signal light by the second controller. Whether the fourth optical fiber and/or the third optical communication device malfunctions may be determined from the fifth sub signal light by a second controller.

With reference to the second aspect, in a possible implementation manner, in a case where it is determined by the first controller that the first optical fiber is faulty and the third optical fiber and the second optical communication device are not faulty, the first optical switch group may be controlled by the first controller to establish an optical path between the second optical switch group and the third optical coupler, and first indication information is sent to the second controller. Receiving, by the second controller, the first indication information. Controlling, by the second controller, the second optical switch group to establish an optical path between the second optical coupler and the first optical switch group in the event that it is determined by the second controller that the second optical fiber is non-faulty.

With reference to the second aspect, in a possible implementation manner, in a case that it is determined by the first controller that the first optical fiber is not faulty and the third optical fiber and/or the second optical communication device is faulty, the first controller controls the first optical switch group to establish an optical path between the first optical coupler and the second optical switch group, and sends second indication information to the second controller. Receiving, by the second controller, the second indication information, and controlling, by the second controller, the second optical switch group to establish an optical path between the first optical switch group and the fourth optical coupler in a case where it is determined by the second controller that the fourth optical fiber and the third optical communication device are not faulty.

With reference to the second aspect, in a possible implementation manner, in case that the first controller determines that the first optical fiber and the third optical fiber, or the first optical fiber, the third optical fiber, and the second optical communication device all have a failure, third indication information is sent to the second controller through the first controller. And receiving the third indication information through the second controller, and controlling the second optical switch group to establish an optical path between the second optical coupler and the fourth optical coupler through the second controller when the second controller determines that none of the second optical fiber, the fourth optical fiber and the third optical communication device has a fault.

With reference to the second aspect, in a possible implementation manner, when the first controller determines that the first optical fiber fails, if the second controller determines that the second optical fiber fails, the second controller outputs service interruption warning information. Wherein the service interruption warning information is used to indicate that a service interruption occurs between the first optical communication device and the second and third optical communication devices.

With reference to the second aspect, in a possible implementation manner, the second optical communication device includes a first multiplexer/demultiplexer, N first branch optical fibers, and N first optical transceivers, each first optical transceiver is connected to the third optical fiber through one branch optical fiber and the first multiplexer/demultiplexer, and the third optical coupler splits the first signal light transmitted by the first multiplexer/demultiplexer through the third optical fiber to obtain the first sub-signal light. The first signal light is obtained by combining and splitting the N first branch signals transmitted on the N first branch optical fibers by the first combiner-splitter. The N first tributary signal lights are generated by the N first optical transceivers and transmitted to the N first tributary optical fibers. Each first branch signal light in the N first branch signal lights is pre-configured with a branch pilot tone signal. N is a positive integer greater than or equal to 2. When the first controller determines that the first optical power difference is smaller than the first preset difference, determining, by the first controller, whether the first sub-signal light includes the N pre-configured branch signal lights of the first branch signal light. If the first controller determines that the first sub-signal light does not include a branch line tune-up signal pre-configured by M first branch signal lights of the N first branch signal lights, it is determined that M first optical transceivers for generating the M first branch signal lights have a failure. Wherein M is a positive integer greater than or equal to 1.

With reference to the second aspect, in a feasible implementation manner, the third optical communication device includes a second multiplexer/demultiplexer, N second tributary optical fibers, and N second optical transceivers, each second optical transceiver is connected to the fourth optical fiber through one second tributary optical fiber and the second multiplexer/demultiplexer, and the N first optical transceivers and the N second optical transceivers are in one-to-one correspondence. The first optical switch group 207 may be controlled to establish an optical path between the first optical coupler 201 and the second optical switch group 208 and transmit fourth indication information to the second controller in case that it is determined that the M first optical transceivers are malfunctioning. Receiving, by the second controller, the fourth indication information. Under the condition that the second controller determines that the second optical fiber, the fourth optical fiber and the third optical communication device are not in fault, the second controller controls the second optical switch group to establish an optical path between the first optical fiber and the fourth optical fiber, so that M second optical transceivers corresponding to the M first optical transceivers in the N second optical transceivers replace the M first optical transceivers in fault to transmit corresponding signal light.

With reference to the second aspect, in a possible implementation manner, the fourth indication information at least includes first identification information corresponding to the M first optical transceivers and fault status information corresponding to the M first optical transceivers, where the fault status information is used to indicate a fault status, and the first controller is further connected to the second optical communication device. The fourth indication information may be transmitted to the second optical communication device through the first controller to inform the second optical communication device that the M first optical transceivers have failed.

With reference to the second aspect, in one possible implementation manner, the second controller is further connected to the third optical communication device. First switching completion indication information from the third optical communication device may be received through the second controller. The first switching completion indication information is generated and sent by the third optical communication device after determining that the M second optical transceivers start to replace the M first optical transceivers to transmit corresponding first branch signal light, and the first switching completion indication information at least includes second identification information corresponding to the M second optical transceivers and non-fault state information corresponding to the M second optical transceivers, where the non-fault state information is used for indicating a non-fault state. And forwarding the first switching completion indication information to the first controller and/or the second optical communication device through the second control information.

With reference to the second aspect, in a possible implementation manner, the optical communication system further includes a fourth optical communication device, a fifth optical communication device, a sixth optical communication device, a fifth optical fiber, a sixth optical fiber, a seventh optical fiber, and an eighth optical fiber, and the dual homing protection device further includes a fifth optical coupler, a sixth optical coupler, a seventh optical coupler, and an eighth optical coupler. The fourth optical communication device is connected with the fifth optical coupler through a fifth optical fiber, the fourth optical communication device is further connected with the sixth optical coupler through a sixth optical fiber, the fifth optical coupler is further connected with the first controller and the first optical switch group respectively, the sixth optical coupler is further connected with the second controller and the second optical switch group respectively, the fifth optical communication device is connected with the seventh optical coupler through a seventh optical fiber, the sixth optical communication device is connected with the eighth optical coupler through an eighth optical fiber, and the first optical switch group is connected with the second optical switch group through a ninth optical fiber.

With reference to the second aspect, in a possible implementation manner, after the first controller and the second controller determine that the first optical fiber is faulty and the third optical fiber and the second optical communication device are not faulty, and control the first optical switch group and the second optical switch group to establish the first optical path between the second optical coupler and the third optical coupler, when the first controller determines that the fifth optical fiber is faulty according to the sub-signal light provided by the fifth optical coupler and determines that the seventh optical fiber and the fifth optical communication device are not faulty according to the sub-signal light provided by the seventh optical coupler, fifth indication information is sent to the second controller. And the second controller is used for the fifth indication information, and under the condition that the second optical fiber, the fourth optical fiber and the third optical communication device are determined to be fault-free, the second optical switch group is controlled to establish a second optical path between the second optical coupler and the fourth optical coupler, so that the third optical communication device replaces the second optical communication device to complete the transmission of the signal light between the second optical communication device and the first optical communication device.

With reference to the second aspect, in a possible implementation manner, when a second switching completion indication from the third optical communication device is received through the first controller and the second controller, the first optical switch group and the second optical switch group are controlled to disconnect the first optical path through the first controller and the second controller. Wherein the second handover completion indication information is generated and transmitted by the third optical communication apparatus upon determining that the second optical communication apparatus is completely replaced.

With reference to the second aspect, in a possible implementation manner, after the first optical path is disconnected, the first optical switch group may be controlled by the first controller to establish an optical path between the seventh optical coupler and the second optical switch group, and sixth indication information is sent to the second controller. The sixth indication information may be received by the second controller, and the second optical switch group may be controlled to establish an optical path between the sixth optical coupler and the first optical switch group, so that an optical path is established between the fourth optical communication device and the fifth optical communication device through the sixth optical fiber and the eighth optical fiber, if it is determined that the seventh optical fiber is not faulty.

In a third aspect, an embodiment of the present application provides a dual homing protection device. The dual-return protection device is connected with the first optical communication device through a first optical fiber and a second optical fiber, the dual-return protection device is connected with the second optical communication device through a third optical fiber, and the dual-return protection device is connected with the third optical communication device through a fourth optical fiber. The dual-homing protection device is used for establishing an optical path between the first optical fiber and a fourth optical fiber or between the second optical fiber and the third optical fiber or a fourth optical fiber when one or more of the first optical fiber, the third optical fiber and the second optical communication device is detected to be in failure, so that signal light is transmitted between the first optical communication device and the second optical communication device or the third optical communication device.

With reference to the third aspect, in one possible implementation manner, the dual homing protection device includes: the optical coupler comprises a first optical coupler, a second optical coupler, a third optical coupler, a fourth optical coupler, a first optical switch group, a second optical switch group, a first controller and a second controller, wherein the first optical coupler is respectively connected with the first controller and the first optical switch group, the first controller is respectively connected with the first optical switch group and the third optical coupler, the first optical switch group is also connected with the second optical switch group, the second optical switch group is respectively connected with the second optical coupler, the second controller and the fourth optical coupler, the second controller is respectively connected with the second optical coupler and the fourth optical coupler, the first controller is connected with the second controller, the first optical coupler is connected with the first optical communication device through the first optical fiber, the second optical coupler is connected with the first optical communication device through the second optical fiber, the third optical coupler is connected with the second optical communication device through the third optical fiber, and the fourth optical communication device through the third optical fiber.

With reference to the third aspect, in a possible implementation manner, the first optical coupler is configured to split the first signal light transmitted to the dual-homing protection device through the first optical fiber to obtain a first sub-signal light and a second sub-signal light, transmit the first sub-signal light to the first controller, and transmit the second sub-signal light to the first optical switch group. The first controller is used for determining that the first optical fiber is in failure when the optical power of the first sub-signal light is determined to be zero.

With reference to the third aspect, in a feasible implementation manner, the third optical coupler is configured to split the second signal light transmitted to the dual-homing protection device through the third optical fiber to obtain third sub-signal light and fourth sub-signal light, transmit the third sub-signal light to the first controller, and transmit the fourth sub-signal light to the first optical switch group. The first controller is configured to determine that the third optical fiber has a fault when it is determined that the optical power of the first sub-signal light is zero, or it is determined that a first optical power difference between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference.

With reference to the third aspect, in a possible implementation manner, the first controller is further configured to determine whether the third sub-signal light includes a target tuning signal when it is determined that the first optical power difference is smaller than the first preset difference, where the target tuning signal is a tuning signal preconfigured by the second signal light. The first control is further configured to determine that the second optical communication device has a failure if it is determined that the third sub-signal light does not include the target tune signal.

With reference to the third aspect, in a possible implementation manner, the second optical coupler is configured to split the third signal light transmitted to the dual-homing protection device through the second optical fiber to obtain a fifth sub-signal light and a sixth sub-signal light, transmit the fifth sub-signal light to the second controller, and transmit the sixth sub-signal light to the second optical switch group. The fourth optical coupler is configured to split fourth signal light transmitted to the dual-return protection device through a fourth optical fiber to obtain seventh sub-signal light and eighth sub-signal light, transmit the seventh sub-signal light to the second controller, and transmit the eighth sub-signal light to the second optical switch group. The second controller is used for determining whether the second optical fiber has a fault according to the fifth sub-signal light. The second controller is further configured to determine whether the fourth optical fiber is faulty according to the seventh sub signal light.

With reference to the third aspect, in a possible implementation manner, the first controller is configured to control the first optical switch group to establish an optical path between the second optical switch group and the third optical coupler and send first indication information to the second controller, when it is determined that the first optical fiber is faulty and the third optical fiber and the second optical communication device are not faulty. The second controller is configured to receive the first indication information, and control the second optical switch group to establish an optical path between the second optical coupler and the first optical switch group when it is determined that the second optical fiber is not faulty.

With reference to the third aspect, in a possible implementation manner, the first controller is configured to send third indication information to the second controller in case that it is determined that the first optical fiber, the third optical fiber and the second optical communication device all have the failure. And the second controller is used for receiving the third indication information and controlling the second optical switch group to establish an optical path between the second optical coupler and the fourth optical coupler under the condition that the second optical fiber and the fourth optical fiber are determined to be not in fault.

With reference to the third aspect, in a possible implementation manner, the second optical communication device includes a first multiplexer/demultiplexer, N first branch optical fibers, and N first optical transceivers, where each first optical transceiver is connected to the third optical fiber through one branch optical fiber and the first multiplexer/demultiplexer. N is a positive integer greater than or equal to 2. The N first optical transceivers are used for generating N first branch signal lights and respectively transmitting the N first branch signal lights to the first multiplexer/demultiplexer through the N first branch optical fibers. Each of the N first branch signal lights is preconfigured with a first branch channel pilot signal, and the first multiplexer/demultiplexer is configured to combine the N first branch signal lights to obtain the first signal light, and transmit the first signal light to the third optical coupler through the third optical fiber. The first controller is further configured to determine whether the first sub-signal light includes a first branch channel pilot signal corresponding to each of the N first branch signal lights when it is determined that the first optical power difference is smaller than the first preset difference. If the first controller determines that the first sub-signal light does not include a first branch set-top signal preconfigured by M first branch signal lights of the N first branch signal lights, it is determined that M first optical transceivers for generating the M first branch signal lights have a failure. Wherein M is a positive integer greater than or equal to 1.

With reference to the third aspect, in a feasible implementation manner, the third optical communication device includes a second multiplexer/demultiplexer, N second tributary optical fibers, and N second optical transceivers, each second optical transceiver is connected to the fourth optical fiber through one second tributary optical fiber and the second multiplexer/demultiplexer, and the N first optical transceivers and the N second optical transceivers are in one-to-one correspondence. The first controller is configured to send fourth indication information to the second controller if it is determined that the M first optical transceivers have failed. The second controller is configured to receive the fourth indication information, and control the second optical switch group to establish an optical path between the second optical fiber and the fourth optical fiber when it is determined that the second optical fiber, the fourth optical fiber, and the third optical communication device are not faulty, so as to replace M faulty first optical transceivers among the N second optical transceivers with the M second optical transceivers to perform transmission of corresponding first branch signal light.

With reference to the third aspect, in a possible implementation manner, the optical communication system further includes a fourth optical communication device, a fifth optical communication device, a sixth optical communication device, a fifth optical fiber, a sixth optical fiber, a seventh optical fiber, and an eighth optical fiber, and the dual homing protection device further includes a fifth optical coupler, a sixth optical coupler, a seventh optical coupler, and an eighth optical coupler. The fourth optical communication device is connected with a fifth optical coupler through a fifth optical fiber, the fourth optical communication device is further connected with a sixth optical coupler through a sixth optical fiber, the fifth optical coupler is further connected with the first controller and the first optical switch group respectively, the sixth optical coupler is further connected with the second controller and the second optical switch group respectively, the fifth optical communication device is connected with a seventh optical coupler through a seventh optical fiber, the sixth optical communication device is connected with an eighth optical coupler through an eighth optical fiber, and the first optical switch group is connected with the second optical switch group through a ninth optical fiber.

With reference to the third aspect, in a possible implementation manner, the first controller is configured to, in a case where it is determined that the first optical fiber is faulty and the third optical fiber and the second optical communication device are not faulty, control, with reference to the second controller, the first optical switch group and the second optical switch group to establish a first optical path between the second optical coupler and the third optical coupler, where the first optical path passes through the ninth optical fiber;

the first controller is further configured to send fifth indication information to the second controller when it is determined that the fifth optical fiber has a fault according to the sub-signal light provided by the fifth optical coupler and it is determined that the seventh optical fiber and the fifth optical communication device have no fault according to the sub-signal light provided by the seventh optical coupler;

the second controller is configured to receive the fifth indication information, and control the second optical switch group to establish a second optical path between the second optical coupler and the fourth optical coupler under the condition that it is determined that the second optical fiber, the fourth optical fiber, and the third optical communication device are not faulty, so as to complete transmission of signal light between the second optical communication device and the first optical communication device by using the third optical communication device instead of the second optical communication device;

and after the first controller and the second controller both receive a second switching completion indication, the first controller controls the first optical switch group and the second optical switch group to disconnect the first optical path by combining with the second controller, wherein the second switching completion indication information is generated and sent by the third optical communication device after the third optical communication device is determined to completely replace the second optical communication device.

With reference to the third aspect, in a possible implementation manner, after the first optical path is disconnected, the first controller is further configured to control the first optical switch group to establish an optical path between the seventh optical coupler and the second optical switch group, and send sixth indication information to the second controller. The second controller is configured to receive the sixth indication information, and control the second optical switch group to establish an optical path between the sixth optical coupler and the first optical switch group when it is determined that the seventh optical fiber is not faulty, so that an optical path is established between the fourth optical communication device and the fifth optical communication device through the sixth optical fiber, the seventh optical fiber, and the eighth optical fiber.

In a fourth aspect, an embodiment of the present application provides a communication system. The communication system comprises a first communication device, an optical communication system as claimed in any one of the first aspects and a second communication device. And the first communication equipment establishes communication connection with the second communication equipment through the optical communication system. The optical communication system is used for transmitting service data between the first communication equipment and the second communication equipment.

With reference to the fourth aspect, in a feasible implementation manner, the first communication device is a terminal device, the second communication device is a backhaul device, the first optical communication apparatus in the optical communication system includes an active antenna unit AAU or a radio remote unit RRU, and the second optical communication apparatus and the third optical communication apparatus in the optical communication system include a baseband processing unit BBU or a distributed unit DU.

With reference to the fourth aspect, in a possible implementation manner, the first communication device is a terminal device, the second communication device is a public cloud device, the first optical communication device in the optical communication system is a customer premises equipment CPE, and the second optical communication device and the third optical communication device are cloud access point POP devices.

The solutions provided in the second aspect to the fourth aspect are used for implementing or cooperating with the optical communication system provided in the first aspect, and therefore, the same or corresponding beneficial effects as those of the first aspect may be achieved, and are not described herein again.

In summary, the optical communication system and the dual homing protection method provided by the application can enable the forwarding network or the private network to realize dual homing protection for the trunk optical fiber and the local side device, and can improve the reliability of the forwarding network or the private network.

Drawings

Fig. 1 is a schematic diagram of a first structure of an optical communication system according to an embodiment of the present application;

fig. 2 is a second structural diagram of an optical communication system according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a first structure of a dual homing protection device according to an embodiment of the present application;

fig. 4 is a schematic diagram of a third structure of an optical communication system according to an embodiment of the present application;

fig. 5 is a fourth structural diagram of an optical communication system according to an embodiment of the present application;

fig. 6 is a schematic diagram of a second structure of a dual homing protection device according to an embodiment of the present application;

fig. 7 is a schematic flowchart of a dual homing protection method according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings provided in the embodiments of the present application.

The existing forward network or private network can only realize single-return protection for the main optical fiber between the remote device and the local device, and cannot realize redundancy protection for the local device. Once the central office device side fails, all services between the remote devices and the central office device are interrupted. Therefore, the existing forwarding network or private network has poor reliability.

Therefore, the technical problem to be solved by the application is as follows: how to realize the dual-homing protection aiming at the main optical fiber and the local terminal equipment in the forward network or the private network so as to improve the reliability of the forward network or the private network.

Fig. 1 is a schematic diagram of a first structure of an optical communication system according to an embodiment of the present application. As shown in fig. 1, the optical communication system 100 includes a first optical communication device 10, a dual homing protection device 20, a second optical communication device 30, a third optical communication device 40, a first optical fiber 101, a second optical fiber 102, a third optical fiber 103, and a fourth optical fiber 104. Wherein the first optical communication device 10 is connected with the dual homing protection device 20 by a first optical fiber 101 and a second optical fiber 102. The dual homing protection device 20 is connected to the second optical communication device 30 by a third optical fiber 103. The dual homing protection device 20 is also connected to a third optical communication device 40 by a fourth optical fiber.

The first optical communication device 10, the second optical communication device 30, and the third optical communication device 40 provided in the embodiment of the present application each have an optical transmission/reception function. That is, the first optical communication device 10, the second optical communication device 30, and the third optical communication device 40 may receive the signal light while the signal light is being transmitted. Accordingly, the signal light can be transmitted bidirectionally between the first optical communication apparatus 10 and the second optical communication apparatus 30 or the third optical communication apparatus 40.

It should be further noted that first optical fiber 101 and second optical fiber 102 are active/standby with each other, third optical fiber 103 and fourth optical fiber 104 are active/standby with each other, and second optical communication device 30 and third optical communication device 40 are also active/standby with each other. That is, the first optical fiber 101, the dual homing protection device 20, and the third optical fiber 103 construct a main path for optical signal transmission between the first optical communication device 10 and the second optical communication device 30, and the second optical fiber 102, the dual homing protection device 20, and the fourth optical fiber 104 construct a standby path for optical signal transmission between the first optical communication device 10 and the third optical communication device 40. In actual use, the optical communication system 100 preferentially uses the main path to transmit the signal light.

During the transmission of the signal light in the optical communication system 100, the dual-homing protection device 20 may be configured to detect whether one or more of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has a failure. When it is determined that one or more of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 is faulty, the dual-homing protection device 20 may establish an optical path between the first optical fiber 101 and the fourth optical fiber 104, or between the second optical fiber 102 and the third optical fiber 103 or the fourth optical fiber 104, so as to transmit signal light between the first optical communication device 10 and the second optical communication device 30 or the third optical communication device 40.

In the above implementation, as long as the dual-homing protection device 20 detects that one or more of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has a failure, the failed optical fiber or optical communication device may be switched to its spare part, thereby implementing the dual-homing protection for the first optical fiber 101 and the second optical communication device 30. Therefore, the optical communication system is applied to the forward network or the private network, so that the dual-homing protection for the trunk optical fiber and the local-side equipment in the forward network or the private network can be realized, and the reliability of the forward network or the private network can be improved.

Further, fig. 2 is a schematic diagram of a second structure of an optical communication system according to an embodiment of the present application. Fig. 2 further shows an alternative specific structure of the above-mentioned dual-homing protection device 20. As shown in fig. 2, the dual homing protection device 20 includes a first optical coupler 201, a second optical coupler 202, a third optical coupler 203, a fourth optical coupler 204, a first controller 205, a second controller 206, a first optical switch group 207, and a second optical switch group 208. The first optical coupler 201 is connected to the first controller 205 and the first optical switch group 207, respectively. The first controller 205 is also connected to the first optical switch group 207 and the third optical coupler 203, respectively. The first optical switch group 207 is also connected to the second optical switch group 208 by an optical fiber. The second optical switch group 208 is also connected to the second optical coupler 202, the second controller 206, and the fourth optical coupler 204, respectively. The second controller 206 is also connected to the second optical coupler 202 and the fourth optical coupler 204, respectively. The first controller 205 is connected to the second controller 206. The first optical coupler 201 is connected to the first optical communication device 10 via the first optical fiber 101, the second optical coupler 202 is connected to the first optical communication device 10 via the second optical fiber 102, the third optical coupler 203 is connected to the second optical communication device 30 via the third optical fiber 103, and the fourth optical coupler 204 is connected to the third optical communication device 40 via the fourth optical fiber 104.

It should be noted that the optical couplers (such as the first optical coupler 201, the second optical coupler 202, and the like described above) provided in the embodiments of the present application all support bidirectional optical transmission, and can implement both optical switching and optical splitting functions. For example, the first optical coupler 201 may split light from the first optical fiber 101 and transmit the two split light beams to the first controller 205 and the first optical switch group 207, respectively, or may directly transfer the light from the first optical switch group 207 to the first optical fiber 101. The functions of the other optical couplers are similar, and thus, detailed description thereof is omitted.

It should be further noted that the optical switch group provided in the embodiment of the present application may be formed by one or more optical switches, which may be turned on or off between different optical interfaces based on a control signal provided by a controller (e.g., the first controller 205). For example, the first optical switch group 207 includes a first optical interface connected to the first optical coupler 201, a second optical interface connected to the first optical switch group 208, and a third optical interface connected to the third optical coupler 203. The first optical switch group 207 may implement on/off between any two of the first to third optical interfaces described above based on a switch control signal provided by the first controller 205. The second optical switch group 208 functions similarly, and will not be described herein.

In the following, for convenience of the subsequent description of the functions of the components in the optical communication system 100, it is now assumed that the actual working scenario of the optical communication system 100 is to transmit first traffic data to the second optical communication device 30 through the first optical communication device 10, and transmit second traffic data to the first optical communication device 10 through the second optical communication device 30.

In practical applications, the second optical communication device 30 may first generate a signal light based on the second service data (for convenience of distinction, the first signal light will be described in place of the second signal light), and then transmit the first signal light to the third optical coupler 203 through the third optical fiber 103. Since the third optical communication device 40 and the fourth optical fiber 104 are in a primary-standby relationship with the second optical communication device 30 and the third optical fiber 103, the third optical communication device 40 also synchronously generates signal light based on the second service data (for convenience of distinction, the third signal light will be described below instead), and transmits the third signal light to the fourth optical coupler 204 through the fourth optical fiber 104. Meanwhile, the first optical communication device 10 may generate source signal light based on the first traffic data and split the source signal light into second signal light and fourth signal light. Then, the first optical communication device 10 may transmit the fourth signal light to the first optical coupler 201 through the first optical fiber 101, and transmit the second signal light to the second optical coupler 202 through the second optical fiber 102.

Further, after receiving the fourth signal light, the first optical coupler 201 may split the fourth signal light to obtain a seventh sub-signal light and an eighth sub-signal light, and transmit the seventh sub-signal light and the eighth sub-signal light to the first controller 205 and the first optical switch group 207, respectively. Here, the optical power of the seventh sub-signal light should be smaller than the optical power of the eighth sub-signal light. Similarly, the second optical coupler 202 may split the second signal light to obtain a third sub-signal light and a fourth sub-signal light after receiving the second signal light, and respectively transmit the third sub-signal light and the fourth sub-signal light to the second controller 206 and the second optical switch group 208. Here, the optical power of the third sub-signal light should be smaller than the optical power of the fourth sub-signal light. Similarly, after receiving the first signal light, the third optical coupler 203 may also split the first signal light to obtain a first sub-signal light and a second sub-signal light, and send the first sub-signal light and the second sub-signal light to the first controller 205 and the second optical switch group 208, respectively. Similarly, the fourth optical coupler 204 may split the third signal light into a fifth sub-signal light and a sixth sub-signal light after receiving the third signal light, and transmit the fifth sub-signal light and the sixth sub-signal light to the second controller 206 and the second optical switch group 208, respectively.

In a possible implementation manner, the first controller 205 may determine whether the first optical fiber 101 is faulty according to the seventh sub-signal light provided by the first optical coupler 201. For example, the first controller 205 may detect whether the optical power of the seventh sub-signal light from the first optical coupler 201 is zero. Here, the first controller 205 may detect whether the optical power of the seventh sub-signal light is zero through a photodetector included therein. When the first controller 205 detects that the optical power of the seventh sub-signal light is zero (i.e., there is no light in the seventh sub-signal light), it may be determined that the first optical fiber 101 is faulty. When the first controller 205 detects that the optical power of the seventh sub-signal light is not zero (i.e., the seventh sub-signal light is light), it may be determined that the first optical fiber 101 is not faulty. For another example, the first controller 205 may also detect whether a second optical power difference between the optical power of the seventh sub-signal light from the first optical coupler 201 and the second preset optical power is equal to or greater than the second preset difference. When the first controller 205 determines that the second optical power difference is equal to or greater than the second preset difference, it may be determined that the first optical fiber 101 is failed. When the first controller 205 determines that the second optical power difference is less than the second preset difference, it may be determined that the first optical fiber 101 is not faulty.

In the implementation, the first controller 205 determines whether the first optical fiber 101 fails by means of optical power detection, which is simple and easy to implement, and can reduce the structural complexity and cost of the dual-return protection device 20.

Similarly, the second controller 206 may determine whether the second optical fiber 102 is faulty according to the third sub-signal light provided by the second optical coupler 202. For example, the second controller 206 may detect whether the optical power of the third sub-signal light from the second optical coupler 202 is zero. When the second controller 206 detects that the optical power of the third sub-signal light is zero, it may be determined that the second optical fiber 102 is faulty. When the second controller 206 detects that the optical power of the third sub-signal light is not zero, it may be determined that the second optical fiber 102 is not faulty. For another example, the second controller 206 may also detect whether a third optical power difference between the optical power of the third sub-signal light from the second optical coupler 202 and the second preset optical power is equal to or greater than the second preset difference. When the first controller 205 determines that the third optical power difference is equal to or greater than the second preset difference, it may be determined that the second optical fiber 102 is out of order. When the second controller 206 determines that the third optical power difference is less than the second predetermined difference, then it may be determined that the second optical fiber 102 is not faulty.

In the above implementation, the second controller 206 also determines whether the second optical fiber 102 fails by means of optical power detection, which can further reduce the structural complexity and cost of the dual-homing protection device 20.

In a possible implementation manner, the first controller 205 further determines whether the third optical fiber 103 and/or the second optical communication device 30 has a failure according to the first sub-signal light provided by the third optical coupler 203. Specifically, the first controller 205 may first detect whether the optical power of the first sub-signal light provided by the second optical coupler 202 is zero, or determine whether a first optical power difference between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference. If the first controller 205 determines that the optical power of the first sub-signal light is zero, or determines that a first optical power difference between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference, it may be determined that the third optical fiber 103 has a fault. If the first controller 205 determines that the first optical power difference is smaller than the first predetermined difference, it may be determined that the third optical fiber 103 is not faulty. In the case where the first controller 205 determines that the third optical fiber 103 is not faulty, the first controller 205 may further determine whether the first sub signal light includes the target set-top signal. Specifically, the first controller 205 may perform a demodulation to the first sub-signal light through a demodulation module included therein to obtain a corresponding demodulation result. The first controller 205 may then determine whether the target set-top signal is included in the set-top demodulation results. If the first controller 205 determines that the target set-top demodulation signal is not included in the set-top demodulation result, it is determined that the target set-top demodulation signal is not included in the first sub-signal light. If the first controller 205 determines that the set-top demodulation result includes the target set-top signal, it may determine that the first sub-signal light includes the target set-top signal. When the first controller 205 determines that the first sub-signal light does not include the target set-top signal, it may be determined that the first signal light generated by the second optical communication device 30 does not include the target set-top signal, and thus it may be determined that the second optical communication device 30 has a failure. When the first controller 205 determines that the first sub signal light includes the target set-top signal, it may determine that the first signal light includes the target set-top signal, and it may determine that the second optical communication device 30 is not faulty.

It should be noted that the target tuning signal is a tuning signal pre-configured for the first signal light. That is, in this implementation, in the process of generating the first signal light, the second optical communication device 30 loads a low-frequency target tuning signal on the traffic signal light generated based on the second traffic data through the tuning technique, and further generates the first signal light that is actually transmitted. It should be understood that the target set-top signal does not interfere with the transmission of the traffic signal light, and may carry a lightweight Operation Administration and Maintenance (OAM) message for optical link diagnostics and optical module power, temperature or circuit alarms.

In the above implementation, the first controller 205 determines whether the third optical fiber 103 is faulty by detecting optical power, and further determines whether the second optical communication device 30 is faulty by detecting whether the target set-top signal is included in the first sub-signal light when it is determined that the third optical fiber 103 is not faulty, so that fault detection for the third optical fiber 103 and the pure optical layer of the second optical communication device 30 can be achieved.

Similarly, the second controller 206 may also determine whether the fourth optical fiber 104 and/or the third optical communication device 40 has a failure according to the fifth sub-signal light provided by the fourth optical coupler 204. Specifically, the second controller 206 may first detect whether the optical power of the fifth sub-signal light provided by the fourth optical coupler 204 is zero, or determine whether a fourth optical power difference between the optical power of the fifth sub-signal light and the first preset optical power is equal to or greater than the first preset difference. If the second controller 206 determines that the optical power of the fifth sub-signal light is zero, or determines that the fourth optical power difference is equal to or greater than the first preset difference, it may be determined that the fourth optical fiber 104 has a fault. If the second controller 206 determines that the fourth optical power difference is less than the first predetermined difference, it may be determined that the fourth optical fiber 104 is not faulty. In the case where the second controller 206 determines that the fourth optical fiber 104 is not faulty, the second controller 206 may further determine whether the fifth sub-signal light includes the target set-top signal. Here, similarly, in the process of generating the third signal light, the third optical communication device 40 loads a low-frequency target tuning signal to the traffic signal light generated based on the second traffic data by using the tuning technique, and further generates the third signal light to be actually transmitted. Here, for a specific process of the second controller 206 detecting whether the fifth sub-signal light includes the target set-top signal, reference may be made to the process of the first controller 205 detecting whether the first sub-signal light includes the target set-top signal, which is not described herein again. When the second controller 206 determines that the fifth sub signal light does not include the target set-top signal, it may be determined that the third signal light generated by the third optical communication apparatus 40 does not include the target set-top signal, and thus it may be determined that the third optical communication apparatus 40 has a failure. When the second controller 206 determines that the fifth sub signal light includes the target set-top signal, it may determine that the third signal light includes the target set-top signal, and it may determine that the third optical communication apparatus 40 is not faulty.

In the above implementation, the second controller 206 also determines whether the fourth optical fiber 104 is faulty by detecting the optical power, and further determines whether the third optical communication device 40 is faulty by detecting whether the fifth sub-signal light includes the target pilot signal when it is determined that the fourth optical fiber 104 is not faulty, so that the fault detection for the pure optical layers of the fourth optical fiber 104 and the third optical communication device 40 can be implemented, and the structural complexity and cost of the dual-homing protection device 20 can be further reduced.

The foregoing describes the process of the dual homing protection device 20 detecting whether the first optical fiber 101, the second optical fiber 102, the third optical fiber 103, the fourth optical fiber 104, the second optical communication device 30, and the third optical communication device 40 are malfunctioning. The following will further explain the processing procedure of the dual homing protection device 20 when determining that one or more of the above-mentioned detection objects is/are failed in combination with the foregoing description.

Fig. 3 is a schematic view of a first structure of a dual-return protection device according to an embodiment of the present application. As shown in fig. 3, the first optical switch group 207 may include a first optical switch 2071, and the second optical switch group 208 may include a second optical switch 2081. The first optical switch 2071 and the second optical switch 2081 are both 1 × 2 optical switches, and the first optical switch 2071 includes a first optical interface, a second optical interface, a third optical interface, and a first electrical interface. The second optical switch 2081 includes a fourth optical interface, a fifth optical interface, a sixth optical interface, and a second electrical interface. The first optical interface of the first optical switch 2071 is connected to the first optical coupler 201, the second optical interface thereof is connected to the third optical coupler 203, the third optical interface thereof is connected to the sixth optical interface of the second optical switch 2081 through the fifth optical fiber 105, and the first electrical interface thereof is connected to the first controller 205. In practical applications, the first controller 205 may send a switch control signal to the first optical switch 2071 through the first electrical interface to control the third optical interface to be turned on or off with the second optical interface or the first optical interface. The fourth optical interface of the second optical switch 2081 is connected to the second optical coupler 202, the fifth optical interface thereof is connected to the fourth optical coupler 204, and the second electrical interface thereof is connected to the second controller 206. In practical applications, the second controller 206 may send a switch control signal to the second optical switch 2081 through the second electrical interface to control the sixth optical interface and the fourth optical interface or the fifth optical interface to be turned on or off. Therefore, it can be understood here that the establishment and release of the optical path between the first optical coupler 201 and the third optical coupler 203 or the fourth optical coupler 204, and the establishment or release of the optical path between the second optical coupler 202 and the third optical coupler 203 or the fourth optical coupler 204 can be realized by the cooperative control of the first controller 205 and the second controller 206. For example, when the first controller 205 controls the first optical switch 2071 to turn on the first optical interface and the third optical interface, and the second controller 206 controls the second optical switch 2081 to turn on the fifth optical interface and the sixth optical interface, the optical path between the first optical coupler 201 and the fourth optical coupler 204 is established. When the first controller 205 controls the first optical switch 2071 to disconnect the first optical interface and the third optical interface, and the second controller 206 controls the second optical switch 2081 to disconnect the fifth optical interface and the sixth optical interface, the release of the optical path between the first optical coupler 201 and the fourth optical coupler 204 can be realized.

In an alternative implementation, in the event that the first controller 205 determines that the first optical fiber 101 is faulty and that the third optical fiber 103 and the second optical communication device 30 are not faulty, the first controller 205 may control the first optical switch set 207 to establish an optical path between the second optical switch set and the third optical coupler 203. Specifically, the first controller 205 may send a first switch control signal to the first optical switch 2071. After receiving the first switch control signal, the first optical switch 2071 may turn on the second optical interface and the third optical interface, so as to establish an optical path between the third optical coupler 203 and the sixth optical interface of the second optical switch 2081. Meanwhile, the first controller 205 may also generate a first indication message and send the first indication message to the second controller 206. Here, the first indication information is mainly used to indicate that the first optical fiber 101 is faulty and that the third optical fiber 103 and the second optical communication device 30 are not faulty.

Then, when the second controller 206 receives the first indication information, if the second controller 206 determines that the second optical fiber 102 is not faulty, the second optical switch group 208 may be controlled to establish an optical path between the second optical coupler 202 and the first optical switch group 207. Specifically, the second controller 206 sends a second switch control signal to the second optical switch 2081. After receiving the second switch control signal, the second optical switch 2081 may turn on its sixth optical interface and its fourth optical interface, so as to establish an optical path between its sixth optical interface and the second optical coupler 202. To this end, the second optical coupler 202 establishes an optical path between the second optical switch 2081, the fifth optical fiber 105, and the first optical switch 2071 and the third optical coupler 203. Then, the fourth sub signal light can be transmitted to the second optical communication device 30 through the second optical switch 2081, the fifth optical fiber 105, the first optical switch 2071, the third optical coupler 203 and the third optical fiber 103, so that the transmission of the first service data from the first optical communication device 10 to the second optical communication device 30 is realized. Meanwhile, the second sub signal light may also be transmitted to the first optical communication device 10 through the third optical coupler 203, the first optical switch 2071, the fifth optical fiber 105, the second optical switch 2081 and the second optical fiber 102, thereby implementing transmission of the second service data from the second optical communication device 30 to the first optical communication device 10. It can also be understood here that the second optical fiber 102 starts to replace the failed first optical fiber 101 to realize the transmission of the traffic data between the first optical communication device 10 and the second optical communication device 20, and the failed first optical fiber 101 completes the switching to the spare second optical fiber 102.

Optionally, when the second controller 206 receives the first indication information, if the second controller 206 determines that the second optical fiber 102 also fails, the second controller 206 may output a service interruption warning message. Here, the service interruption warning message may be used to indicate that service interruption occurs between the first optical communication device 10 and the second and third

optical communication devices

30 and 40.

In the above implementation, when the dual-homing protection device 20 determines that the first optical fiber 101 has a fault and the third optical fiber 103 and the second optical communication device 30 have no fault, the second optical fiber 102 may replace the first optical fiber 101 to transmit corresponding service data, so that the optical communication system 100 can implement fault protection for the first optical fiber 101.

In an alternative implementation, in the event that the first controller 205 determines that the first optical fiber 101 is not faulty and the third optical fiber 103 and/or the second optical communication device 30 is faulty, the first controller 205 may control the first optical switch group 207 to establish an optical path between the third optical coupler 203 and the second optical switch group 208. The first controller 205 may also generate and send second indication information to the second controller 206. Here, the second indication information may be used to indicate that the first optical fiber 101 is not faulty and that the third optical fiber 103 and/or the second optical communication device 30 is faulty. When the second controller 206 receives the second indication information, if the second controller 206 determines that the fourth optical fiber 104 and the third optical communication device 40 are not faulty, the second optical switch group 208 may be controlled to establish an optical path between the first optical switch group 207 and the fourth optical coupler 204. Thus, the eighth sub-signal light split by the first optical coupler 201 can be transmitted to the third optical communication device 40 through the fourth optical fiber 104, and the sixth sub-signal light can be transmitted to the first optical communication device 10 through the first optical fiber 101.

Specifically, in conjunction with the structure shown in fig. 3, when the first controller 205 determines that the first optical fiber 101 is not faulty and the third optical fiber 103 and/or the second optical communication device 30 is faulty, the first controller 205 may generate and transmit a third switch control signal to the first optical switch 2071. After receiving the third switch control signal, the first optical switch 2071 may turn on the first optical interface and the third optical interface, so as to establish an optical path between the first optical coupler 201 and the second optical switch 2081. Meanwhile, the first controller 205 may also generate a second indication information and transmit the second indication information to the second controller 206. After receiving the second indication information, the second controller 206 may generate and send a fourth switch control signal to the second optical switch 2081 when determining that the fourth optical fiber 104 and the third optical communication device 40 are not faulty. After receiving the fourth switch control signal, the second optical switch 2081 may turn on the fifth optical interface and the sixth optical interface, so as to establish an optical path between the first optical switch 2071 and the fourth optical coupler 204. To this end, the first optical coupler 201 establishes an optical path between the second optical switch 2081, the fifth optical fiber 105, and the first optical switch 2071 and the fourth optical coupler 204. Then, the eighth sub signal light can be transmitted to the third optical communication device 40 through the first optical switch 2071, the fifth optical fiber 105, the second optical switch 2081, the fourth optical coupler 204 and the fourth optical fiber 104, so that the transmission of the first service data from the first optical communication device 10 to the third optical communication device 40 is realized. Meanwhile, the sixth sub signal light may also be transmitted to the first optical communication device 10 through the second optical switch 2081, the fifth optical fiber 105, the first optical switch 2071, the first optical coupler 201 and the first optical fiber 101, so that the transmission of the second service data from the third optical communication device 40 to the first optical communication device 10 is realized. It can also be understood here that the fourth optical fiber 104 and the third optical communication device 40 start to replace the failed third optical fiber 103 and/or the second optical communication device 30 to realize the transmission of the traffic data with the first optical communication device 10, and the third optical fiber 103 and the second optical communication device 30 complete the switching to the spare third optical fiber 104 and the spare third optical communication device 40.

Optionally, when the second controller 206 receives the second indication information, if the second controller 206 determines that the fourth optical fiber 104 and/or the third optical communication device 40 also fails, the service interruption alarm information may be output.

In the above implementation, when the dual-homing protection device 20 determines that the first optical fiber 101 is not faulty and the third optical fiber 103 and/or the second optical communication device 30 is faulty, the spare fourth optical fiber 104 and the spare third optical communication device 40 can be used to replace the third optical fiber 103 and the second optical communication device 30 for performing corresponding transmission of service data, so that the optical communication system can also implement fault protection for the third optical fiber and the second optical communication device.

In an alternative implementation manner, in the case that it is determined that the first optical fiber 101 and the third optical fiber 103 both fail, or it is determined that the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 all fail, the first controller 205 may generate and send third indication information to the second controller 206. Here, the third indication information is used to indicate that both the first optical fiber 101 and the third optical fiber 103 have failed, or that both the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 have failed. After receiving the third indication information, the second controller 206 determines that none of the second optical fiber 102, the fourth optical fiber 104, and the third optical communication device 40 is faulty, and then controls the second optical switch group 208 to establish an optical path between the second optical coupler 202 and the fourth optical coupler 204. Thus, the fourth sub-signal light can be transmitted to the third optical communication device 40 through the fourth optical fiber 104, and the sixth sub-signal light can also be transmitted to the first optical communication device 10 through the second optical fiber 102, thereby ensuring normal transmission of the first service data and the second service data.

Specifically, with reference to the configuration shown in fig. 3, after receiving the third instruction information, if it is determined that none of the second optical fiber 102, the fourth optical fiber 104, and the third optical communication device 40 has failed, the second controller 206 may generate and transmit a fifth switch control signal to the second optical switch 2081. After receiving the fifth switch control signal, the second optical switch 2081 may turn on the fourth optical interface and the fifth optical interface, so as to establish an optical path between the second optical coupler 202 and the fourth optical coupler 204. To this end, the second optical coupler 202 establishes an optical path between the second optical switch 2081 and the fourth optical coupler 204. Then, the fourth sub signal light can be transmitted to the third optical communication device 40 through the second optical switch 2081, the fourth optical coupler 204 and the fourth optical fiber 104, so that the transmission of the first service data from the first optical communication device 10 to the third optical communication device 40 is realized. Meanwhile, the sixth sub signal light may also be transmitted to the first optical communication device 10 through the second optical switch 2081, the second optical coupler 202 and the second optical fiber 102, so that transmission of the second service data from the third optical communication device 40 to the first optical communication device 10 is realized. It should be understood that, at this time, the second optical fiber 102, the fourth optical fiber 104 and the third optical communication device 40 start to replace the failed first optical fiber 101, the third optical fiber 103 and the second optical communication device 30 to realize the transmission of the traffic data with the first optical communication device 10.

In the above implementation, when the dual-homing protection device 20 determines that the first optical fiber 101, the third optical fiber 103 and/or the second optical communication device 30 are failed, corresponding service data can be transmitted through the spare second optical fiber 102, the spare third optical fiber 103 and the spare third optical communication device 40 instead of the first optical fiber 101, the spare third optical fiber 103 and the spare second optical communication device 30, so that the failure protection for the first optical fiber 101, the spare third optical fiber 103 and the spare second optical communication device 30 is realized in the dual-homing protection mechanism of the optical communication system 100 with respect to the first optical fiber 101, the spare third optical fiber 103 and the spare second optical communication device 30.

In the above-mentioned various implementations, whenever any one or more of the first optical fiber 101, the third optical fiber 103 and the second optical communication device 30 fails, the dual-homing protection device 20 may adopt a corresponding switching operation to replace the failed object with the spare part for transmission of corresponding service data, which enables the optical communication system 100 to implement dual-homing protection for the transmission optical fiber and the optical communication device. Therefore, the optical communication system 100 is applied to a forward network or a private network, so that the reliability of the forward network or the private network can be improved.

Further, in an optional implementation manner, when the first controller 205 determines that the failure occurred in any one or more of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has recovered (i.e., the first controller 205 detects that the object having the failure has recovered to be normal again), the first controller 205 and the second controller 206 may cooperatively control the first optical switch group 207 and the second optical switch group 208, so that the main path constructed by the first optical fiber 101, the dual-homing protection device 20, and the third optical fiber 103, and the standby path constructed by the second optical fiber 102, the dual-homing protection device 20, and the fourth optical fiber 104 recover to the state when none of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has failed. The scenario that the first optical fiber 101 is failed and the third optical fiber 103 and the second optical communication device 30 are not failed is taken as an example. After the first optical communication device 10 establishes an optical path through the second optical fiber 102, the second optical coupler 202, the second optical switch group 208, the first optical switch group 207, the third optical coupler 203, and the third optical fiber 103, the first controller 205 may continue to detect the state of the first optical fiber. When the first controller 205 detects that the first optical fiber 101 has been faultless again, the first controller 205 may reestablish the optical path between the first optical coupler 201 and the third optical coupler 203. Meanwhile, the first controller 205 may also send a first state recovery message to the second controller 206. Here, the first state restoration information is used to indicate that the first optical fiber 101 has eliminated the fault. After receiving the first state recovery information, the second controller 206 may reestablish an optical path between the second optical coupler 202 and the fourth optical coupler 204. Up to this point, the main path and the backup path are restored to the state when none of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has failed.

Here, after detecting that the object with the failure has recovered to normal again, the dual-homing protection device 20 may automatically restore the main path constructed by the first optical fiber 101, the dual-homing protection device 20, and the third optical fiber 103, and the standby path constructed by the second optical fiber 102, the dual-homing protection device 20, and the fourth optical fiber 104 to the state when none of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has the failure, so that the functional flexibility of the dual-homing protection device 20 may be improved.

In some possible implementations, the first optical communication device 10, the second optical communication device 30, and the third optical communication device 40 may include a plurality of optical transceivers, and the plurality of optical transceivers correspond to a plurality of optical tributaries. For example, fig. 4 is a schematic diagram of a third structure of an optical communication system according to an embodiment of the present application. As shown in fig. 4, the first optical communication device 20 may specifically include N third optical transceivers, N third branch optical fibers, a third multiplexer/demultiplexer, and a ninth optical coupler. And one of the N third optical transceivers is connected with a third combiner/splitter through one of the N third branch optical fibers, and the third combiner/splitter is further connected with a ninth optical coupler. The ninth optical coupler is further connected to a first optical coupler 201 and a second optical coupler 202 via a first optical fiber 101 and a second optical fiber 102, respectively. Similarly, the second optical communication device 30 may specifically include N first optical transceivers, N first branch optical fibers, and a first multiplexer/demultiplexer. One of the N first optical transceivers is connected to a first multiplexer/demultiplexer through one of the N first branch optical fibers, and the first multiplexer/demultiplexer is further connected to a third optical coupler 203 through a third optical fiber 103. The third optical communication device 40 may specifically include N second optical transceivers, N second branch optical fibers, and a second multiplexer/demultiplexer. One of the N second optical transceivers is connected to a second multiplexer/demultiplexer through one of the N second branch optical fibers, and the second multiplexer/demultiplexer is further connected to a fourth optical coupler 204 through a fourth optical fiber 104.

In combination with the transmission scenario assumed above, the first service data may include N first sub-service data, and the second service data may include N second sub-service data. In an actual operation process, the N third optical transceivers generate N third tributary signal lights based on the N first sub-service data. Here, a third optical transceiver generates a third branch signal light based on a first sub traffic data, and each third branch signal light is preconfigured with a corresponding second branch pilot signal. And then, the N third branch signal lights are transmitted to a third combiner-splitter through N third branch optical fibers. After receiving the N third branch signal lights, the third combiner/splitter may combine the N third branch signal lights to obtain a combined signal light, and transmit the combined signal light to the ninth optical coupler. Then, the ninth optical coupler may split the combined signal light to obtain a fourth signal light and a second signal light, and transmit the fourth signal light to the first optical coupler 201 through the first optical fiber 101, and transmit the second signal light to the second optical coupler 202 through the second optical fiber 102. Similarly, the N first optical transceivers generate N first tributary signal lights based on the N second sub-service data, and further transmit the N first tributary signal lights to the first multiplexer/demultiplexer through the N first tributary optical fibers. Here, each first branch signal is preconfigured with one first branch set-top signal. After receiving the N first branch signal lights, the first multiplexer/demultiplexer may combine the N first branch signal lights to obtain the first signal light, and transmit the first signal light to the third optical coupler 203 through the third optical fiber 103. Meanwhile, the N second optical transceivers also generate N second tributary signal lights based on the N second sub-service data, and further transmit the N second tributary signal lights to the second multiplexer/demultiplexer through N second tributary optical fibers. Here, each second branch signal light is also preconfigured with a first branch pilot signal. After receiving the N second branch signal lights, the second combiner/splitter may combine the N second branch signal lights to obtain the third signal light, and transmit the third signal light to the fourth optical coupler 204.

Further, the first controller 205 may determine whether the first optical fiber 101 fails according to the optical power of the seventh sub-signal light provided by the first optical coupler 201, and the specific process may be referred to above, and is not described herein again. The first controller 205 may also determine whether the third optical fiber 103 fails according to the optical power of the first sub-signal light provided by the third optical coupler 203. In the case where the first controller 205 determines that the third optical fiber 103 has no fault, the first controller 205 may further determine whether the first sub-signal light includes a first branch set-top signal corresponding to each of the N first branch signal lights. Here, for a specific process of the first controller 205 determining whether the first sub-signal light includes the first branch set-top signal corresponding to each of the N first branch signal lights, reference may be made to the process of the first controller 205 determining whether the first sub-signal light includes the target set-top signal, which is not described herein again. When the first controller 205 determines that the first sub signal light includes the first branch channel tuning signal corresponding to each first branch signal light, it may be determined that none of the N first optical transceivers in the second optical communication device 30 has a failure, that is, it is determined that the second optical communication device 30 has no failure. When the first controller 205 determines that the first sub signal light does not include the first branch signal light corresponding to the M first sub signal lights among the N first branch signal lights, it may be determined that the M first optical transceivers for generating the M first sub signal lights have a failure, and it may be determined that the second optical communication device 30 has a failure. Here, M is a positive integer greater than or equal to 1.

Similarly, the second controller 206 may determine whether the fourth optical fiber fails according to the optical power of the fifth sub-signal light provided by the fourth optical coupler 204, and the specific process is described in the foregoing, and is not described herein again. In the case where the second controller 206 determines that the fourth optical fiber 104 has no fault, the second controller 206 may further determine whether the fifth sub-signal light includes the first branch set-top signal corresponding to each of the N second branch signal lights. Here, a specific process of determining whether the fifth sub-signal light includes N first branch set-top signals corresponding to N second branch signal lights by the second controller 206 may refer to the process of determining whether the first sub-signal light includes N first branch set-top signals corresponding to N first branch signal lights by the first controller 205 described above, and details thereof are not repeated here. When the second controller 206 determines that the fifth sub signal light includes the first tributary tune signal corresponding to each second tributary signal light, it may be determined that none of the N second optical transceivers in the third optical communication device 40 has a fault, that is, it is determined that the third optical communication device 40 has no fault. When the second controller 206 determines that the fifth sub signal light does not include the first branch tuning signal corresponding to the P first branch signal lights of the N first branch signal lights, it may determine that the P second optical transceivers for generating the P second branch signal lights have a failure, and may also determine that the third optical communication device 40 has a failure. Here, P is a positive integer greater than or equal to 1.

Further, in the case that the first controller 205 determines that none of the N first optical transceivers in the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 is faulty, and the second controller 206 determines that none of the N second optical transceivers in the second optical fiber 102, the fourth optical fiber 104, and the third optical communication device 40 is faulty, the eighth sub-signal light may reach the first multiplexer/demultiplexer through the first optical switch group 207, the third optical coupler 203, and the third optical fiber 103. Then, the first multiplexer/demultiplexer may demultiplex the eighth sub-signal light to obtain N fourth branch signal lights corresponding to the N third branch signal lights. Here, each of the N fourth branch signal lights includes a first sub-service data and is loaded with a pre-configured second branch channel-set signal. Then, the first multiplexer/demultiplexer may transmit the N fourth tributary signal lights to the N first optical transceivers through the N first tributary optical fibers, respectively, thereby completing optical transmission of the N first sub service data from the first optical communication device 10 to the second optical communication device 30. The third sub-signal light can reach the second multiplexer/demultiplexer through the second optical switch group 208, the fourth optical coupler 204, and the fourth optical fiber 104. Then, the second multiplexer/demultiplexer may demultiplex the third sub-signal light to obtain N fifth branch signal lights identical to the N fourth branch signal lights. Here, each fifth branch signal light of the N second tributary-less signal lights includes a first sub-service data and is loaded with a pre-configured second tributary set top signal. Then, the second multiplexer/demultiplexer may transmit the N fifth tributary signal lights to N second optical transceivers through the N second tributary optical fibers, respectively, thereby completing optical transmission of the N first sub service data from the first optical communication device 10 to the third optical communication device 40.

Meanwhile, the second sub-signal light may be transmitted to the ninth optical coupler through the first optical switch group 207, the first optical coupler 201, and the first optical fiber 101, and the sixth sub-signal light may be transmitted to the ninth optical coupler through the second optical switch group 208, the second optical coupler 202, and the second optical fiber 102. Then, the ninth optical coupler combines the second sub-signal light and the sixth sub-signal light, and transmits the combined signal light to the third optical multiplexer/demultiplexer. The third optical multiplexer/demultiplexer may split the combined signal light to obtain N fifth branch signal lights. Here, each of the N fifth branch signal lights carries a second sub-service data, and a pre-configured first branch set-top signal is also loaded. Then, the third combiner/splitter may transmit the N fifth tributary signal lights to N third optical transceivers through N third tributary optical fibers, respectively, thereby completing optical transmission of N second sub service data from the second optical communication device 30 and the third optical communication device 40 to the first optical communication device 20.

When the first controller 205 determines that the first optical fiber 101 is not faulty and M first optical transceivers in the second optical communication device 30 are faulty, the first controller 205 may control the first optical switch group 207 to establish an optical path between the first optical coupler 201 and the second optical switch group 208. For the detailed process, reference is made to the foregoing description, and the detailed description is omitted here. Meanwhile, the first controller 205 may generate and transmit fourth indication information to the second controller 206. The fourth indication information is used for indicating that the M first optical transceivers have faults. After receiving the fourth indication information, the second controller 206 may control the second optical switch group 208 to establish an optical path between the first optical switch group 207 and the fourth optical coupler 204 if it is determined that none of the fourth optical fiber 104 and the N second optical transceivers in the third optical communication device 40 are faulty. To this end, the first optical coupler 201 and the fourth optical coupler 204 establish an optical path through the first optical switch group 207, the fifth optical fiber 105 and the second optical switch group 208. Then, the eighth sub-signal light can be transmitted to the third optical communication device 40 through the first optical switch group 2071, the fifth optical fiber 105, the second optical switch group 208, the fourth optical coupler 204 and the fourth optical fiber 104. Meanwhile, the sixth sub-signal light may also be transmitted to the first optical communication device 10 through the second optical switch group 208, the fifth optical fiber 105, the first optical switch group 207, the first optical coupler 201, and the first optical fiber 101. Therefore, M second optical transceivers corresponding to the M first optical transceivers in the N second optical transceivers can be used to replace the M failed first optical transceivers to perform corresponding tributary signal light transmission. It should be understood that the transmission traffic carried by the failed M first optical transceivers may also be completely switched to the M second optical transceivers.

In the above implementation, when M first optical transceivers in the second optical communication device 30 fail, the dual-homing protection device 20 may switch the transmission traffic carried by the failed M first optical transceivers to corresponding M second optical transceivers in the third optical communication device 40. This may achieve protection for one or more optical transceivers in the second optical communication device 30, which may improve the diversity of functions of the optical communication system 100.

Optionally, the fourth indication information at least includes first identification information corresponding to the M first optical transceivers and fault status information corresponding to the M second optical transceivers, where the fault status information is used to indicate a fault status. The first controller 205 is also connected to the second optical communication device 30. After generating the fourth indication information, the first controller 205 may also send the fourth indication information to the second optical communication device 30 to notify the second optical communication device 30 that the M first optical transceivers included in the second optical communication device 30 have failed.

Optionally, after the second controller 206 controls the second optical switch group 208 to establish an optical path between the first optical switch group 207 and the fourth optical coupler 204, the second controller 206 may further generate a branch fault indication message. The tributary failure indication information may include optical transceiver identification information corresponding to the M failed first optical transceivers. The second controller 206 may then send the branch fault indication information to the third optical communication device 40. The third optical communication device 40 may turn off the second optical transceivers other than the M second optical transceivers among the N second optical transceivers included therein after receiving the tributary failure indication information. In this case, only the M second optical transceivers in the third optical communication device 40 are operating normally, and power consumption of the third optical communication device 40 can be reduced.

Optionally, the second controller 206 is further connected to the third optical communication device 40. After the third optical communication device 40 determines that M second optical transceivers included in the third optical communication device have replaced the M failed first optical transceivers to perform corresponding tributary signal optical transmission, the third optical communication device 40 may send second switching completion indication information to the second controller. The second switching completion indication information at least includes second identification information corresponding to the M second optical transceivers and non-fault status information corresponding to the M second optical transceivers. Here, the no-fault status information is used to indicate a no-fault status. The second switching completion indication information is used to indicate that the M second optical transceivers have replaced the M failed first optical transceivers to perform corresponding tributary signal light transmission. Further, after receiving the second handover completion indication information, the second controller 206 may further forward the second handover completion indication information to the first controller 205 and/or the second optical communication device 30 to inform the first controller 205 and/or the second optical communication device 30 that the corresponding branch handover has been completed.

Alternatively, in a similar manner as before, in the case that the dual homing protection device 20 detects that the M failed first optical transceivers have recovered to normal again, the dual homing protection device 20 may cooperatively control the first optical switch group 207 and the second optical switch group 208 to perform corresponding recovery operations through the first controller 205 and the second controller 206, so as to reestablish the optical path between the first optical coupler 201 and the third optical coupler 203, and reestablish the optical path between the second optical coupler 202 and the fourth optical coupler 204. This may enable the M first optical transceivers to re-carry the corresponding transport traffic.

In the foregoing, the optical communication system 100 is described with a scenario that only the main path (for convenience of distinction, the first main path will be described instead in the following) constructed by the first optical fiber 101, the dual-homing protection device 20, and the third optical fiber 103, and the backup path (for convenience of distinction, the first backup path will be described instead in the following) constructed by the second optical fiber 102, the dual-homing protection device 20, and the fourth optical fiber 104 are included in the optical communication system 100. The structure and function of the optical communication system 100 will be described below by taking a scenario in which the optical communication system 100 includes a first main path, a second main path, a first backup path, and a second backup path at the same time as an example.

Fig. 5 is a fourth structural diagram of an optical communication system according to an embodiment of the present application. As shown in fig. 5, the optical communication system 100 further includes a fourth optical communication device 50, a fifth optical communication device 60, a sixth optical communication device 70, a fifth optical fiber 105, a sixth optical fiber 106, a seventh optical fiber 107, and an eighth optical fiber 108. The dual homing protection device 20 further includes a fifth optical coupler 209, a sixth optical coupler 210, a seventh optical coupler 211, an eighth optical coupler 212, and a ninth optical fiber 109. The fourth optical communication device 50 is connected to a fifth optical coupler 209 through a fifth optical fiber 105, and the fifth optical coupler 209 is further connected to the first controller 205 and the first optical switch group 207, respectively. The fourth optical communication device 50 is connected to a sixth optical coupler 210 through a sixth optical fiber 106, and the sixth optical coupler 210 is further connected to the second controller 206 and the second optical switch group 208, respectively. The fifth optical communication device 60 is connected to a seventh optical coupler 211 through a seventh optical fiber 107, and the seventh optical coupler 211 is further connected to the first controller 205 and the first optical switch group 207, respectively. The sixth optical communication device 70 is connected to an eighth optical coupler 212 through the eighth optical fiber 108, and the eighth optical coupler 212 is further connected to the second controller 206 and the second optical switch group 208, respectively. The first optical switch group 207 and the second optical switch group 208 are connected by a ninth optical fiber 109.

Here, a second main path is established between the fourth optical communication device 50 and the fifth optical communication device 60 through the fifth optical fiber 105, the dual-homing protection device 20, and the seventh optical fiber 107, and a second auxiliary path is established between the fourth optical communication device 50 and the sixth optical communication device 70 through the sixth optical fiber 106, the dual-homing protection device 20, and the sixth optical communication device 70.

For the convenience of the following description of the functions of the optical communication system 100 shown in fig. 5, it is assumed that the specific working scenario is: the first optical communication device 10 transmits the first traffic data to the second optical communication device 30, the second optical communication device 30 transmits the second traffic data to the first optical communication device 10, the fourth optical communication device 50 transmits the third traffic data to the fifth optical communication device 60, and the fifth optical communication device 60 transmits the fourth traffic data to the fourth optical communication device 50.

In actual operation, the fourth optical communication device 50 may generate a fifth signal light and a sixth signal light carrying the third service data. For a specific process, reference may be made to the foregoing specific process for generating the second signal light and the fourth signal light by the first optical communication device 10, and details are not repeated here. Then, the fourth optical communication device 50 may transmit the fifth signal light to the fifth optical coupler 209 through the fifth optical fiber 105 and may also transmit the sixth signal light to the sixth optical coupler 210 through the sixth optical fiber 106. As in the first optical coupler 201 described above, the fifth optical coupler 209 may split the fifth signal light into two sub signal lights after receiving the fifth signal light, and transmit the two sub signal lights to the first controller 205 and the first optical switch group 207, respectively. The sixth optical coupler 210 may also split the sixth signal light into two sub signal lights after receiving the sixth signal light, and transmit the two sub signal lights to the second controller 206 and the second optical switch group 208, respectively.

The fifth optical communication device 60 may generate a seventh signal light carrying the fourth service data, and transmit the seventh signal light to the seventh optical coupler 211 through the seventh optical fiber 107. Meanwhile, the sixth optical communication device 70 may generate an eighth signal light carrying fourth service data, and transmit the eighth signal light to the eighth optical coupler 212 through the eighth optical fiber 108. As in the function of the first optical coupler 201 described above, the seventh optical coupler 211 may split the seventh signal light into two sub signal lights after receiving the seventh signal light, and transmit the two sub signal lights to the first controller 205 and the first optical switch group 207, respectively. After receiving the eighth signal light, the eighth optical coupler 212 may split the eighth signal light into two sub-signal lights and transmit the two sub-signal lights to the second controller 206 and the second optical switch group 208, respectively.

Further, the first controller 205 may determine whether the fifth optical fiber is faulty according to the sub signal light provided by the fifth optical coupler 209. The specific process is the same as the process described above in which the first controller 205 determines whether the seventh optical fiber 107 fails according to the seventh sub-signal light, and thus, the detailed description thereof is omitted here. The first controller 205 may further determine whether the seventh optical fiber 107 and the fifth optical communication device 60 have a fault according to the sub-signal light from the seventh optical coupler 211, and the specific process is the same as the process of determining whether the third optical fiber 103 and the second optical communication device 30 have a fault according to the first sub-signal light by the first controller 205, which is not described herein again.

Similarly, the second controller 206 can determine whether the sixth optical fiber fails according to the sub-signal light provided by the sixth optical coupler 210, and the specific process is the same as the process described above in which the second controller 206 determines whether the second optical fiber 102 fails according to the third sub-signal light, and therefore, the detailed description thereof is omitted here. The second controller 206 may further determine whether the eighth optical fiber 108 and the sixth optical communication device 70 have a failure according to the sub-signal light from the eighth optical coupler 212, and the specific process is the same as the process of determining whether the fourth optical fiber 104 and the third optical communication device 40 have a failure according to the fifth sub-signal light by the second controller 206, which is not described herein again.

As can be understood from the foregoing description and the structure shown in fig. 5, both the switching between the first main path and the first standby path and the switching between the second main path and the second standby path need to depend on the dual homing protection device 20, that is, the dual homing protection device 20 is shared. The first optical switch group 207 and the second optical switch group 208 in the dual-homing protection device 20 are connected only through the ninth optical fiber 109, and at the same time, the ninth optical fiber 109 can only support the switching between one main path and one standby path. Therefore, when the first main path and the second main path fail at the same time, the dual homing protection device 20 needs a new mechanism to avoid the problem that failure protection cannot be simultaneously implemented for a plurality of main paths due to the occupation of the ninth optical fiber 109.

Fig. 6 is a second structural schematic diagram of a dual-homing protection device according to an embodiment of the present application. As shown in fig. 6, the first optical switch group 207 may specifically include a third optical switch 2072, a fourth optical switch 2073 and a fifth optical switch 2074. The second optical switch group 208 may specifically include a sixth optical switch 2082, a seventh optical switch 2083, and an eighth optical switch 2084. The third optical switch 2072 is connected to the first controller 205, the first optical coupler 201, the third optical coupler 203 and the fifth optical switch 2074 respectively. The fourth optical switch 2073 is connected to the first controller 205, the fifth optical coupler 209, the seventh optical coupler 211 and the fifth optical switch 2074, respectively. The seventh optical switch 2083 is connected to the second controller 206, the second optical coupler 202, the fourth optical coupler 204, and the sixth optical switch 2082, respectively. The eighth optical switch 2084 is connected to the second controller 206, the sixth optical coupler 210, the eighth optical coupler 212, and the sixth optical switch 2082, respectively. Sixth optical switch 2082 is further coupled to second controller 206, and fifth optical switch 2074 is further coupled to first controller 205. The fifth optical switch 2074 and the sixth optical switch 2082 are connected by a ninth optical fiber 109.

In operation, the first controller 205 may control the fourth optical switch 2073 to establish an optical path between any two of the fifth optical coupler 209, the seventh optical coupler 211 and the fifth optical switch 2074. The first controller 205 may also control the third optical switch 2072 to establish an optical path between any two of the first optical coupler 201, the third optical coupler 203 and the fifth optical switch 2074. The first controller 205 may also control the fifth optical switch 2074 to establish an optical path between the fourth optical switch 2073 and the ninth optical fiber, or between the third optical switch 2072 and the ninth optical fiber. Similarly, the second controller 206 can control the seventh optical switch 2083 to establish an optical path between any two of the second optical coupler 202, the fourth optical coupler 204, and the sixth optical switch 2082. Second controller 206 may also control eighth optical switch 2084 to establish an optical pathway between any two of sixth optical coupler 210, eighth optical coupler 212, and sixth optical switch 2082. The second controller 206 may also control the sixth optical switch 2082 to establish an optical path between the seventh optical switch 2083 and the ninth optical fiber, or between the eighth optical switch 2084 and the ninth optical fiber.

In an alternative implementation, in combination with the functional description of the components in the optical communication system 100, in the case that the first controller 205 detects that the first optical fiber 101 is faulty and the third optical fiber 103 and the second optical communication device 30 are not faulty, the first controller 205 may control the first optical switch group 207 and the second optical switch group 208 to establish an optical path between the second optical coupler 202 and the third optical coupler 203 in combination with the second controller 206 (for the sake of description, the description will be replaced with the first optical path). Here, the first optical path passes through the ninth optical fiber 109.

Specifically, with reference to the structure shown in fig. 6, the first controller 205 may control the third optical switch 2072 to establish an optical path between the third optical coupler 203 and the fifth optical switch 2074, and simultaneously control the fifth optical switch 2074 to establish an optical path between the third optical switch 2072 and the ninth optical fiber, so that an optical path may be established between the third optical coupler 203 and the ninth optical fiber. Meanwhile, the first controller 205 may also generate first indication information and transmit the first indication information to the second controller 206. Here, the first indication information is used to indicate that the first optical fiber 101 is faulty and that the third optical fiber 103 and the second optical communication device 30 are not faulty.

Optionally, when the optical communication system includes a plurality of main paths and a plurality of standby paths, the first indication information may specifically include first main path identification information for indicating the first main path and fault indication information for indicating a fault occurrence location. The first main path identification information may specifically include device identifications or board identifications of the first optical communication device 10 and the second optical communication device 30. The fault indication information specifically includes fault point indication information and fault state indication information. The fault point indication information includes at least three values, which are assumed to be a first value, a second value and a third value. The fault point indication information under the first value is used for indicating a line optical fiber in the main road (such as a first optical fiber in the first main road), the fault point indication information under the second value is used for indicating a branch optical fiber in the main road or a local side device (such as a third optical fiber and a second optical communication device in the first main road), and the fault point indication information under the third value is used for indicating the line optical fiber, the branch optical fiber and the local side device. The fault status indication information may include at least two values, which are assumed to be a fourth value and a fifth value. The fault state indication information under the fourth value is used for indicating that a fault occurs, and the fault state indication information under the fifth value is used for indicating that no fault exists.

Taking the first indication information as an example, table 1-1 is a first indication information provided in the embodiments of the present application. As shown in table 1-1, the first indication information includes device identifiers of the first optical communication device 10 and the second optical communication device 30, the failure point indication information is a third value, and the failure state indication information is a sixth value, which indicates that the first optical fiber 101 in the first main path has failed.

TABLE 1-1

First main road identification information	Fault point indication information	Fault status indication information
			Device identification of first optical communication apparatus 10 and second optical communication apparatus 30	First value	The fourth value

It should be understood that, in practical use, the indication information sent by the first controller 205 to the second controller 206 may also be implemented in other forms, and the present application is not limited thereto specifically.

Further, after determining that the first indication information is received, the second controller 206 may control the seventh optical switch 2083 to establish an optical path between the second optical coupler 202 and the sixth optical switch 2082, and simultaneously control the sixth optical switch 2082 to establish an optical path between the seventh optical switch 2083 and the ninth optical fiber 109, so that an optical path may also be established between the second optical coupler 202 and the ninth optical fiber 109. Thus, the first optical path is established between the third optical coupler 203 and the second optical coupler 202, and the first optical communication device 10 can transmit the first service data to the second optical communication device 30 through the second optical fiber 102, the dual-homing protection device 20, and the third optical fiber 103, and can receive the second service data transmitted by the second optical communication device 30 through the second optical fiber 102, the dual-homing protection device 20, and the third optical fiber 103.

Optionally, after completing the establishment of the optical path between the second optical coupler 202 and the ninth optical fiber 109, the second controller 206 may further generate and send first response information to the first controller 205 according to the first indication information. The first response information is used to indicate that the second controller 206 has controlled the second optical fiber 102 to perform the corresponding transmission of the signal light in place of the failed first optical fiber 101. Here, the first response information may include first backup identification information corresponding to the second backup, and fault replacement point information indicating a specific backup object and fault status information of the fault replacement point. The fault replacement point information includes at least three values, which are assumed to be an eighth value, a ninth value, and a tenth value. The failure replacement point information under the eighth value is used for indicating a line optical fiber in the standby path (for example, a second optical fiber in the first standby path), the failure replacement point information under the ninth value is used for indicating a branch optical fiber in the standby path or an office end device (for example, a fourth optical fiber and a third optical communication device in the first standby path), and the failure replacement point information under the tenth value is used for indicating the line optical fiber, the branch optical fiber and the office end device. The above described fault status indication information is the same as the fault status indication information contained in the first indication information described above. The fault state indication information under the fourth value is used for indicating that a fault occurs, and the fault state indication information under the fifth value is used for indicating that no fault exists.

Meanwhile, when the first controller 205 determines that the fifth optical fiber 105 is also failed from the sub signal light provided by the fifth optical coupler 209 and determines that the seventh optical fiber 107 and the fifth optical communication device 60 are not failed from the sub signal light provided by the seventh optical coupler 211, the first controller 205 may generate and transmit fifth indication information to the second controller 206. Here, the fifth indication information indicates that the first optical fiber 101 and the fifth optical fiber 105 are failed, and that the seventh optical fiber 107, the fifth optical communication device 60, the third optical fiber 103, and the second optical communication device 30 are not failed. After receiving the fifth indication information, the second controller 206 controls the second optical switch group 208 to establish a new optical path between the second optical coupler 202 and the fourth optical coupler 204 in the case that it is determined that the second optical fiber 102, the fourth optical fiber 104, and the third optical communication device 40 are not faulty (for convenience of distinction, the second optical path will be used instead of the description below). In a specific implementation, with reference to the structure of fig. 7, after determining that the fifth indication information is received, the second controller 206 may control the seventh optical switch 2083 to establish an optical path between the second optical coupler 202 and the sixth optical switch 2082, and simultaneously control the seventh optical switch 2083 to establish an optical path between the second optical coupler 202 and the fourth optical coupler 204, so that an optical path may also be established between the second optical coupler 202 and the ninth optical fiber 109. In this way, the optical communication system 100 may cause the third optical communication apparatus 40 to replace the second optical communication apparatus 30 based on the second optical path to continue the transmission of the signal light between the second optical communication apparatus 30 and the first optical communication apparatus 10.

Optionally, after the second controller 206 establishes the second optical path, the second controller 206 may further generate and send first response information for the first indication information to the first controller, where the first response information is mainly used to indicate a third optical communication device in the first backup path and replace the second optical communication device 30 to perform corresponding transmission of signal light.

Further, after the third optical communication apparatus 40 determines that it has completely replaced the second optical communication apparatus 30, it may generate and transmit the first switching completion indication information to the first controller 205 and the second controller 206. After the first controller 205 and the second controller 206 both receive the first switching completion indication information, the first controller 205 may control the first optical switch group 207 and the second optical switch group 208 to disconnect the first optical path in combination with the control of the second controller 206. After the first optical path is broken, the ninth optical fiber 109 is released.

Specifically, in combination with the structure shown in fig. 6, the first controller 205 can control the third optical switch 2072 and the fifth optical switch 2074 to disconnect the optical connection, and the second controller 206 can control the sixth optical switch 2082 to disconnect the optical connection with the seventh optical switch 2083, so that the seventh optical switch 2083 and the third optical switch 2072 can be completely disconnected, and the effect of releasing the occupation of the ninth optical fiber 109 can be achieved.

Here, after the third optical communication device 40 determines that it has completely replaced the second optical communication device 30, it may notify the first controller 205 and the second controller 206 through the first switching completion indication information, so that the first controller 205 and the second controller 206 can further control the second primary path to switch to the second backup path in time, which may improve the timeliness of fault protection.

Further, after the first controller 205 cooperates with the second controller 206 to disconnect the first optical path, the first controller 205 may further control the first optical switch group 207 to establish an optical path between the seventh optical coupler 211 and the first optical switch group 207. Specifically, with reference to the structure shown in fig. 6, the first controller 205 may control the fourth optical switch 2073 to establish optical connection between the seventh optical coupler 211 and the fifth optical switch 2074, and the first controller 205 may also control the fifth optical switch 2074 to establish optical connection between the ninth optical fiber 109 and the fourth optical switch 2073, so as to implement the optical path from the seventh optical coupler 211 to the ninth optical fiber 109. Meanwhile, the first controller 205 may also transmit sixth indication information to the second controller 206. Here, the sixth indication information is used to indicate that an optical connection has been established between the ninth optical fiber 109 and the fourth optical switch 2073. The second controller 206 may control the second optical switch group 208 to establish an optical path between the sixth optical coupler 210 and the first optical switch group 207 when determining that the seventh optical fiber 107 has no fault after determining that the sixth indication information is received. Specifically, with the structure described in connection with fig. 7, the second controller 206 may control the eighth optical switch 2084 to establish optical connection between the sixth optical switch 2082 and the sixth optical coupler 210, and the second controller 206 may also control the sixth optical switch 2082 to establish optical connection between the ninth optical fiber 109 and the eighth optical switch 2084, so that the seventh optical coupler 211 and the sixth optical coupler 210 may establish optical connection. To this end, an optical path may be established between the fourth optical communication device 50 and the fifth optical communication device 60 through the sixth optical fiber 106, the seventh optical fiber 107 and the ninth optical fiber 109, and the third service data and the fourth service data may be transmitted between the fourth optical communication device 50 and the fifth optical communication device 60 through the optical path.

In the above implementation, in the case that the optical communication system 100 includes a plurality of main paths and standby paths, and the plurality of main paths and the standby paths share the dual-homing protection device 20, the dual-homing protection device 20 may release the occupied shared ninth optical fiber 109 by completely switching the first main path that fails first to the corresponding first standby path, and then further control the second main path that fails later to switch to the second standby path, so that the problem that the fault protection cannot be provided for the plurality of main paths at the same time due to the occupation of the ninth optical fiber 109 can be effectively solved, and the practicability of the optical communication system 100 can be further improved.

It should be added that, in the architecture of the optical communication system 100 described in conjunction with fig. 1 or fig. 2, in this specific scenario of forwarding, especially in the scenario of 4G forwarding, the first optical communication apparatus 10 is an apparatus including one or more RRUs, and can be regarded as a remote device in a 4G forwarding network. The second optical communication apparatus 30 and the third optical communication apparatus 40 are apparatuses including one or more BBUs, and may be regarded as central office devices in a 4G forwarding network. The first optical fiber 101 and the second optical fiber 102 can be regarded as two main optical fibers for main use and standby use. In the 5G forwarding scenario, the first optical communication device 20 is a device including one or more AAUs, which can be regarded as a remote device in the 5G forwarding network. The second optical communication apparatus 30 and the third optical communication apparatus 40 are apparatuses including one or more DUs, which can be regarded as office-side equipment in a 5G forwarding network.

In the private line scenario, the first optical communication device 10 is a CPE device, which can be regarded as a remote device in a private line network. The second optical communication device 30 and the third optical communication device 40 may be different cloud point of presence (POP) devices, which may be considered as local side devices in a private line network.

In addition, the architecture of the optical communication system 100 shown in fig. 5 above is incorporated. In the case of forward transmission, especially in the case of 4G forward transmission, the first optical communication device 10 and the fourth optical communication device 50 are devices including one or more RRUs, and they can be regarded as remote devices in the forward transmission network. The second optical communication apparatus 30, the third optical communication apparatus 40, the fifth optical communication apparatus 60, and the sixth optical communication apparatus 70 are apparatuses including one or more BBUs, and they can be regarded as local side devices in a forwarding network. In the 5G forwarding scenario, the first optical communication apparatus 10 and the fourth optical communication apparatus 50 are apparatuses including one or more AAUs, which can be regarded as remote devices in the forwarding network. The second optical communication device 30, the third optical communication device 40, the fifth optical communication device 60, and the sixth optical communication device 70 are devices including one or more DUs, which can be regarded as central office equipment in a forwarding network.

In the scenario of a private network, the first optical communication device 10 and the fourth optical communication device 50 are CPE devices, which can be regarded as remote devices in the private network, and the second optical communication device 30, the third optical communication device 40, the fifth optical communication device 60, and the sixth optical communication device 70 can be different cloud point of presence (POP) devices, which can be regarded as local devices in the private network.

Since the structure of the optical communication system 100 and the specific process for implementing the dual homing protection function are as described above in the private network or the fronthaul network, the structure of the optical communication system 100 and the specific process for implementing the dual homing protection function are not repeatedly described in conjunction with two specific scenarios, i.e., the private network or the fronthaul network, in order to avoid redundancy.

The embodiment of the present application further provides a dual homing protection method applicable to the optical communication system 100 described above. The dual homing protection method may be implemented by cooperation of functional components in the optical communication system 100. It should be noted that, the following description of the dual homing protection method will be based on the optical communication system 100 described above, and the connection relationship and the functions of the related functional components may be referred to the corresponding description in the foregoing, and will not be described again here.

Fig. 7 is a schematic flowchart of a dual homing protection method according to an embodiment of the present application. As shown in fig. 7, the dual homing protection method includes the following steps.

S701, detecting whether the first optical fiber, the third optical fiber and the second optical communication device have faults or not through the double-return protection device.

In some possible implementations, during the process that the optical communication system 100 transmits the first service data to the second optical communication device 30 through the first optical communication device 10 and transmits the second service data to the first optical communication device through the second optical communication device 30, the optical communication system 100 may detect whether the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 have failed through the dual-homing protection device 20.

In a specific implementation, when the structure of the optical communication system 100 is as shown in fig. 3, the optical communication system 100 may generate, by using the first optical communication device 10, second signal light and fourth signal light carrying the first service data, and transmit the fourth signal light to the dual-homing protection device 20 through the first optical fiber 101, and transmit the second signal light to the dual-homing protection device 20 through the second optical fiber 102. Meanwhile, the optical communication system 100 may also generate a first signal light carrying second service data through the second optical communication device 30, and transmit the first signal light to the dual homing protection device 20 through the third optical fiber 103. The optical communication system 100 may also generate a third signal light carrying the second service data through the third optical communication device 40, and transmit the third signal light to the dual homing protection device 20 through the third optical fiber 103.

Alternatively, the optical communication system 100 may determine whether the first optical fiber 101 fails according to the optical power of the seventh sub-signal light provided by the first optical coupler 201 by the first controller 205 in the dual-homing protection device 20. If it is determined by the first controller 205 that the optical power of the seventh sub-signal light is zero, or it is determined that a second optical power difference between the optical power of the seventh sub-signal light and a second preset optical power is equal to or greater than a second preset difference, it is determined that the first optical fiber 101 has a fault. If it is determined by the first controller 205 that the second optical power difference is less than the second predetermined difference, it may be determined that the first optical fiber 101 is not faulty. Here, the specific process of determining whether the first optical fiber 101 fails according to the optical power of the seventh sub-signal light by the first controller 205 may refer to corresponding description in the first embodiment, and details thereof are not repeated here.

Similarly, the optical communication system 100 may also determine whether the second optical fiber 102 is faulty according to the optical power of the third sub-signal light provided by the second optical coupler 202 through the second controller 206. For a specific process, reference may be made to corresponding descriptions in the first embodiment, and details are not described herein again.

Optionally, the optical communication system 100 may further determine whether the third optical fiber is failed according to the optical power of the first sub signal light provided by the third optical coupler 203 through the first controller 205. If it is determined by the first controller 205 that the optical power of the first sub-signal light is zero, or it is determined that a first optical power difference between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference, it is determined that the third optical fiber 103 has a fault. If it is determined by the first controller 205 that the first optical power difference is less than the first predetermined difference, it may be determined that the third optical fiber 103 is not faulty. Here, for the specific process of the optical communication system 100 determining whether the third optical fiber has a fault according to the optical power of the first sub-signal light through the first controller 205, reference may be made to the corresponding description in the first embodiment, and details are not repeated here.

Further, in the case that the optical communication system 100 determines that the third optical fiber 103 is fault-free (i.e., determines that the optical power of the first sub-signal light is not zero) through the first controller 205, it may further determine whether the first sub-signal light includes the target set-top signal through the first controller 205. Here, the target tune signal is a pre-configured tune signal of the first signal light. If it is determined by the first controller 205 that the first sub-signal light does not include the target tune signal, the optical communication system 100 may determine that the second optical communication apparatus is malfunctioning. If it is determined by the first controller 205 that the first sub-signal light includes the target tune signal, the optical communication system 100 may determine that the second optical communication device is not malfunctioning. Here, the specific process of determining whether the second optical communication device 30 has the fault according to whether the first sub-signal light includes the target tune signal by the first controller 205 may refer to the corresponding description in the first embodiment, and will not be described herein again.

Similarly, the optical communication system 100 may further determine whether the fourth optical fiber 104 and the third optical communication device 40 are malfunctioning according to the sixth sub signal light provided by the fourth optical coupler 204 through the second controller 206. For a specific process, reference may be made to the corresponding description in the first embodiment, and details are not repeated here.

Alternatively, in the optical communication system as shown in fig. 5, in a case that it is determined by the first controller 205 that the third optical fiber 103 is not faulty, it may be further determined by the first controller 205 whether the first sub-signal light includes N branch signal lights pre-configured by the first branch signal light. If the first controller 205 determines that the first sub-signal light does not include the branch set-top signal pre-configured by the M first branch signal lights of the N first branch signal lights, it may be determined that the M first optical transceivers for generating the M first branch signal lights have a failure. Here, the specific process of the optical communication system 100 determining whether M first optical transceivers of the N first optical transceivers of the second optical communication device 30 have failed according to the first sub-signal light through the first controller 205 may refer to the corresponding description of the first embodiment, and details are not described here.

Similarly, in the case where the structure of the optical communication system 100 is as shown in fig. 5, the optical communication system 100 may also determine whether P second optical transceivers of the N second optical transceivers of the third optical communication device 40 have failed according to the five sub-signal lights by the second controller 206. For a specific process, reference may be made to the corresponding description in the first embodiment, and further description is omitted here

S702, if it is determined that one or more of the first optical fiber, the third optical fiber, and the second optical communication device has a fault, an optical path is established between the first optical fiber and the fourth optical fiber, or between the second optical fiber and the third optical fiber or the fourth optical fiber through the dual-homing protection device.

In some possible implementations, if the optical communication system 100 determines that one or more of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 is failed through the dual-homing protection device 20, an optical path may be further established between the first optical fiber 101 and the fourth optical fiber 104, or between the second optical fiber 102 and the third optical fiber 103 or the fourth optical fiber 104 through the dual-homing protection device 20, so that signal light is transmitted between the first optical communication device 10 and the second optical communication device 30 or the third optical communication device 40.

In a possible implementation manner, in the case that the structure of the optical communication system 100 is as shown in fig. 3, if the optical communication system 100 determines that the first optical fiber 101 is faulty and the third optical fiber 103 and the second optical communication device 30 are not faulty through the first controller 205, the first optical switch group 207 may be controlled by the first controller 205 to establish an optical path between the second optical switch group 208 and the third optical coupler 203, and the first indication information is sent to the second controller 206. Here, the first indication information is used to indicate that the first optical fiber 101 is faulty and that the third optical fiber 103 and the second optical communication device 30 are not faulty. Then, after receiving the first indication information through the second controller 206, if the second controller 206 determines that the second optical fiber 102 is not faulty, the second controller 206 may control the second optical switch group 208 to establish an optical path between the second optical coupler 202 and the first optical switch group 207. This makes it possible to establish an optical path between the second optical fiber 102 and the third optical fiber 103, thereby enabling the first optical communication apparatus 10 and the second optical communication apparatus 30 to perform transmission of signal light through the second optical fiber 102 and the third optical fiber 103. Here, for a specific process of the optical communication system 100 establishing an optical path between the second optical fiber 102 and the third optical fiber 103 through the dual homing protection device 20, reference may be made to the corresponding description in the first embodiment, and details thereof are not repeated here.

In yet another alternative implementation, in the case that the structure of the optical communication system 100 is as shown in fig. 3, if it is determined by the first controller 205 that the first optical fiber 101 is not faulty and the third optical fiber 103 and/or the second optical communication device 30 is faulty, the optical communication system 100 may control the first optical switch group 207 to establish an optical path between the first optical coupler 201 and the second optical switch group 208 through the first controller 205, and send the second indication information to the second controller 206. If the second indication information is received by the second controller 206 and it is determined by the second controller 206 that the fourth optical fiber 104 and the third optical communication device 40 are not faulty, the optical communication system 100 can control the second optical switch group 208 to establish an optical path between the first optical switch group 207 and the fourth optical coupler 204 through the second controller 206. This enables establishment of an optical path between the first optical fiber 101 and the fourth optical fiber 104, thereby enabling transmission of signal light by the first optical communication apparatus 10 and the third optical communication apparatus 40 through the first optical fiber 101 and the fourth optical fiber 104. Here, the specific process of establishing the optical path between the first optical fiber 101 and the fourth optical fiber 104 through the dual-homing protection device 20 can be referred to the corresponding description of the first embodiment, and is not described herein again.

In yet another alternative implementation, in the case that the structure of the optical communication system 100 is as shown in fig. 3, if the first controller 205 determines that the first optical fiber 101 and the third optical fiber 103, or the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 all have a failure, the optical communication system 100 may send third indication information to the second controller through the first controller 205. If the optical communication system 100 receives the third indication information through the second controller 206 and determines that none of the second optical fiber 102, the fourth optical fiber 104, and the third optical communication device 40 is faulty through the second controller 206, the second optical switch group 208 may be controlled by the second controller 206 to establish an optical path between the second optical coupler 202 and the fourth optical coupler 204. This enables the establishment of an optical path between the second optical fiber 102 and the fourth optical fiber 104, thereby enabling the first optical communication apparatus 10 and the third optical communication apparatus 40 to transmit signal light through the second optical fiber 102 and the fourth optical fiber 104. Here, for a specific process of the optical communication system 100 establishing an optical path between the second optical fiber 102 and the fourth optical fiber 104 through the dual homing protection device 20, reference is made to the corresponding description in the first embodiment, and details thereof are not repeated here.

Here, in the case where it is determined by the first controller 205 that the first optical fiber 101 has failed, if it is determined by the second controller 206 that the second optical fiber 102 has failed, the optical communication system 100 may output a service interruption warning message through the second controller 206. Here, the service interruption warning information is mainly used to indicate that service interruption occurs between the first optical communication device 10 and the second and third

optical communication devices

30 and 40.

In yet another alternative implementation, in the case that the structure of the optical communication system 100 is as shown in fig. 5, if it is determined by the first controller 205 that M first optical transceivers in the second optical communication device 30 have failed, the first controller may control the first optical switch group 207 to establish an optical path between the first optical coupler 201 and the second optical switch group 208, and the first controller 205 may send fourth indication information to the second controller 206. If the fourth indication information is received by the second controller 206 and it is determined by the second controller 206 that the fourth optical fiber 104 and the third optical communication device 40 are not faulty, the second optical switch group 208 may be controlled by the second controller 206 to establish an optical path between the first optical switch group 207 and the fourth optical coupler 204. Thus, the first optical communication device 10 can establish an optical path between the first optical fiber 101 and the third optical communication device 40, and M second optical transceivers corresponding to M first optical transceivers among the N second optical transceivers can perform corresponding first branch signal light transmission instead of the M failed first optical transceivers. Here, for a specific process of the optical communication system 100 establishing an optical path between the first optical fiber 101 and the fourth optical fiber 104 through the dual homing protection device 20, reference is made to the corresponding description in the first embodiment, and details thereof are not repeated here.

Optionally, the fourth indication information at least includes first identification information corresponding to the M first optical transceivers and fault status information corresponding to the M first optical transceivers, where the fault status information is used to indicate a fault status. After the first controller 205 generates the fourth indication information, the first controller 205 may send the fourth indication information to the second optical communication device 30 to notify the second optical communication device 30 that the M first optical transceivers have failed.

Optionally, the optical communication system 100 may further receive the first switching completion indication information from the third optical communication apparatus 40 through the second controller 206. The first switching completion indication information is generated and transmitted by the third optical communication device 40 after determining that the M second optical transceivers start transmitting the corresponding first branch signal light instead of the M first optical transceivers. The first switching completion indication information at least includes second identification information corresponding to the M second optical transceivers and non-failure status information corresponding to the M second optical transceivers. Here, the no-fault state information is used to indicate a no-fault state. Further, the optical communication system may further forward the first switching completion indication information to the first controller 205 and/or the second optical communication device 30 through the second controller 206, so as to inform that the M second optical transceivers have started to perform corresponding first branch signal light transmission instead of the M first optical transceivers.

Further, in a case where the optical communication system 100 includes the first main path, the first backup path, the second main path, and the second backup path (in this case, the structure of the optical communication system 100 is shown in fig. 6), after the optical communication system 100 determines that the first optical fiber 101 has a failure and the third optical fiber 103 and the second optical communication device 30 have no failure through the first controller 205 and the second controller 206, and controls the first optical switch group 207 and the second optical switch group 208 to establish the first optical path between the second optical coupler 202 and the third optical coupler 203, when the optical communication system 100 determines that the fifth optical fiber 105 has a failure again through the first controller 205 according to the sub-signal light provided by the fifth optical coupler 209 and determines that the seventh optical fiber 107 and the fifth optical communication device 6 have no failure according to the sub-signal light provided by the seventh optical coupler 211, the optical communication device 100 may transmit fifth indication information to the second controller 206 through the first controller 205. For a specific process, reference may be made to the related description in the first embodiment, and details are not repeated herein.

If the optical communication system 100 receives the fifth indication information through the second controller 206 and determines that the second optical fiber 102, the fourth optical fiber 104, and the third optical communication device 40 are not faulty, the second controller 206 may control the second optical switch group 208 to establish a second optical path between the second optical coupler 202 and the fourth optical coupler 204, so as to complete transmission of signal light between the second optical communication device 30 and the first optical communication device 10 through the third optical communication device 40 instead of the second optical communication device 30.

Further, when the optical communication system 100 receives a second switching completion indication from the third optical communication device 40 through the first controller 205 and the second controller 206, the first optical switch group 207 and the second optical switch group 208 may be controlled to disconnect the first optical path through the first controller 205 and the second controller 206. Wherein the second switching completion indication information is generated and transmitted by the third optical communication device 40 after determining that it completely replaces the second optical communication device 30. Here, for a specific process of the optical communication system 100 to disconnect the first optical path, reference may be made to corresponding processes in the first embodiment, and details are not described here again.

Further, after disconnecting the first optical path, the optical communication system 100 may control the first optical switch group 207 to establish an optical path between the seventh optical coupler 211 and the second optical switch group 208 through the first controller 205, and send sixth indication information to the second controller 206. Then, if the optical communication system 100 receives the sixth indication information through the second controller 206 and determines that the seventh optical fiber 107 is not faulty, the second optical switch group 208 may be controlled to establish an optical path between the sixth optical coupler 210 and the first optical switch group 207, so that an optical path is established between the fourth optical communication device 50 and the fifth optical communication device 60 through the sixth optical fiber and the eighth optical fiber. Here, for a specific process of the optical communication system 100 establishing an optical path between the fourth optical communication device 50 and the fifth optical communication device 60 through the sixth optical fiber and the eighth optical fiber, reference may be made to the corresponding process described in the first embodiment, and details are not repeated here.

In this embodiment, the optical communication system 100 can switch the optical fiber or the optical communication device with failure to its spare portion by detecting that one or more of the first optical fiber 101, the third optical fiber 103, and the second optical communication device 30 has failure through the dual-homing protection device. Thus, a dual homing protection for the second optical fiber 102 and the second optical communication device 30 can be achieved by this method. Therefore, when the method and the optical communication system 100 are applied to a forward network or a private network, the dual-homing protection for the trunk optical fiber and the local-side device can be realized, and the reliability of the forward network or the private network can be improved.

Fig. 8 is a schematic structural diagram of a communication system according to an embodiment of the present application. As shown in fig. 8, the communication system 800 includes at least the optical communication system 100, the first communication device 300, and the second communication device 400 described above. Wherein the first communication device 300 establishes a communication connection with the second communication device 400 via the optical communication system 100. The optical communication system 100 is mainly used for carrying transmission of service data between the first communication device 300 and the second communication device 400.

In the forward scenario, the first communication device 300 may specifically be a terminal device. Here, the terminal device may be a wireless device providing voice and/or data connectivity to a user, which may be a handheld device having wireless connection capability, or other processing device connected to a wireless modem, a mobile device communicating with one or more core networks via a radio access network. For example, the wireless device may be a mobile phone, a computer, a tablet computer, a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable device, an electronic book reader (e-book reader), and the like. As another example, the wireless device may be a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device. For another example, the wireless device may be a mobile station (mobile station) or an access point (access point). The present application does not specifically limit the type of the terminal device. The second communication device 400 may specifically be a backhaul device. The first optical communication device 101 in the above-mentioned optical communication system 100 may be a device including an active antenna unit AAU or a radio remote unit RRU, and the second optical communication device 30 and the third optical communication device 40 may be devices including a baseband processing unit BBU/distributed unit DU.

In a private line scenario, the first communication device 300 may specifically be a terminal device. The second communication device 400 may be a public cloud device. The public cloud device is a device related to a public cloud in a private line scene, such as a cloud server and a cloud computing device, and the application does not specifically limit the device. The first optical communication apparatus in the optical communication system 100 may be a customer premises equipment CPE, and the second optical communication apparatus 30 and the third optical communication apparatus 40 may be cloud point of presence POP apparatuses.

It should be understood that the optical communication system 100 and the dual homing protection method provided in the embodiment of the present application are not only suitable for the dedicated network, i.e. the forwarding network mentioned above, but also suitable for other optical communication scenarios requiring dual homing protection of services.

Those skilled in the art will recognize that in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

Claims

1. An optical communication system comprising a dual homing protection device, a first optical communication device, a second optical communication device, a third optical communication device, a first optical fiber, a second optical fiber, a third optical fiber, and a fourth optical fiber, wherein:

the dual-homing protection device is connected with the first optical communication device through the first optical fiber and the second optical fiber;

the dual-homing protection device is connected with the second optical communication device through the third optical fiber, and the dual-homing protection device is connected with the third optical communication device through the fourth optical fiber;

the dual-homing protection device is used for establishing an optical path between the first optical fiber and a fourth optical fiber or between the second optical fiber and the third optical fiber or the fourth optical fiber when one or more of the first optical fiber, the third optical fiber and the second optical communication device is/are detected to be in failure, so that signal light is transmitted between the first optical communication device and the second optical communication device or the third optical communication device.

2. The optical communication system of claim 1, wherein the dual homing protection device comprises: the optical coupler comprises a first optical coupler, a second optical coupler, a third optical coupler, a fourth optical coupler, a first optical switch group, a second optical switch group, a first controller and a second controller, wherein the first optical coupler is respectively connected with the first controller and the first optical switch group, the first controller is respectively connected with the first optical switch group and the third optical coupler, the first optical switch group is also connected with the second optical switch group, the second optical switch group is respectively connected with the second optical coupler, the second controller and the fourth optical coupler, the second controller is respectively connected with the second optical coupler and the fourth optical coupler, the first controller is connected with the second controller, the first optical coupler is connected with the first optical communication device through the first optical fiber, the second optical coupler is connected with the first optical communication device through the second optical fiber, the third optical coupler is connected with the second optical communication device through the third optical fiber, and the fourth optical communication device through the third optical fiber.

3. The optical communication system according to claim 2, wherein the signal light includes first signal light transmitted to the third optical coupler through the third optical fiber;

the third optical coupler is used for obtaining first sub-signal light and second sub-signal light according to the first signal light, transmitting the first sub-signal light to the first controller, and transmitting the second sub-signal light to the first optical switch group;

the first controller is to:

and when the optical power of the first sub-signal light is determined to be zero, or a first optical power difference value between the optical power of the first sub-signal light and a first preset optical power is determined to be equal to or greater than a first preset difference value, determining that the third optical fiber has a fault.

4. The optical communication system of claim 3, wherein the first controller is further configured to:

when the first optical power difference is smaller than the first preset difference, determining whether the first sub-signal light contains a target tuning signal, wherein the target tuning signal is a tuning signal pre-configured for the first signal light;

and if the first sub-signal light does not contain the target tuning signal, determining that the second optical communication device has a fault.

5. The optical communication system according to any one of claims 2 to 4, wherein the signal light further includes second signal light transmitted to the second optical coupler through the second optical fiber and third signal light transmitted to the fourth optical coupler through the fourth optical fiber;

the second optical coupler is used for obtaining third sub-signal light and fourth sub-signal light according to the light splitting of the second signal light, transmitting the third sub-signal light to the second controller, and transmitting the fourth sub-signal light to the second optical switch group;

the fourth optical coupler is used for obtaining fifth sub-signal light and sixth sub-signal light according to the light splitting of the third signal light, transmitting the fifth sub-signal light to the second controller, and transmitting the sixth sub-signal light to the second optical switch group;

the second controller is used for determining whether the second optical fiber is in failure according to the third sub-signal light;

the second controller is further configured to determine whether the fourth optical fiber and/or the third optical communication device is malfunctioning according to the fifth sub-signal light.

6. The optical communication system according to claim 5, wherein the first controller is configured to control the first optical switch group to establish an optical path between the second optical switch group and the third optical coupler and send first indication information to the second controller, if it is determined that the first optical fiber has a fault and the third optical fiber and the second optical communication device have no fault;

the second controller is configured to receive the first indication information, and control the second optical switch group to establish an optical path between the second optical coupler and the first optical switch group when it is determined that the second optical fiber is not faulty, so as to transmit the fourth sub-signal light to the second optical communication device through the third optical fiber and transmit the second sub-signal light to the first optical communication device through the second optical fiber.

7. The optical communication system according to claim 5 or 6, wherein the first controller is configured to control the first optical switch group to establish an optical path between the first optical coupler and the second optical switch group and send second indication information to the second controller in case that it is determined that the first optical fiber is not faulty and the third optical fiber and/or the second optical communication device is faulty;

the second controller is configured to receive the second indication information, and control the second optical switch group to establish an optical path between the first optical switch group and the fourth optical coupler under the condition that it is determined that the fourth optical fiber and the third optical communication device are not faulty, so as to transmit the sub-signal light provided by the first optical coupler to the third optical communication device through the fourth optical fiber, and transmit the sixth sub-signal light to the first optical communication device through the first optical fiber.

8. The optical communication system according to any one of claims 5 to 7, wherein the first controller is configured to send third indication information to the second controller in case it is determined that the first optical fiber and the third optical fiber, or the first optical fiber, the third optical fiber, and the second optical communication device, are failed;

the second controller is configured to receive the third indication information, and, in a case where it is determined that none of the second optical fiber, the fourth optical fiber, and the third optical communication device is faulty, control the second optical switch group to establish an optical path between the second optical coupler and the fourth optical coupler, so as to transmit the fourth sub-signal light to the third optical communication device through the fourth optical fiber, and transmit the sixth sub-signal light to the first optical communication device through the second optical fiber.

9. The optical communication system according to claim 3, wherein the second optical communication device includes a first combiner/splitter, N first tributary optical fibers, and N first optical transceivers, each of the first optical transceivers is connected to the third optical fiber through one tributary optical fiber and the first combiner/splitter, and N is a positive integer greater than or equal to 2;

the N first optical transceivers are configured to generate N first branch signal lights and transmit the N first branch signal lights to the first multiplexer/demultiplexer through the N first branch optical fibers, where each of the N first branch signal lights is preconfigured with a first branch pilot tone signal;

the first multiplexer/demultiplexer is configured to combine the N first branch signal lights to obtain the first signal light, and transmit the first signal light to the third optical coupler through the third optical fiber;

the first controller is further configured to determine whether the first sub-signal light includes a first branch pilot signal corresponding to each of the N first branch signal lights when it is determined that the first optical power difference is smaller than the first preset difference;

if the first controller determines that the first sub-signal light does not include a first branch set top signal preconfigured by M first branch signal lights of the N first branch signal lights, it is determined that M first optical transceivers for generating the M first branch signal lights have a failure, where M is a positive integer greater than or equal to 1.

10. The optical communication system according to claim 9, wherein the third optical communication device includes a second combiner/splitter, N second tributary optical fibers, and N second optical transceivers, each of the second optical transceivers is connected to the fourth optical fiber through one second tributary optical fiber and the second combiner/splitter, and the N first optical transceivers correspond to the N second optical transceivers one to one;

the first controller is used for controlling the first optical switch group to establish an optical path between the first optical coupler and the second optical switch group and sending fourth indication information to the second controller under the condition that the first optical fiber is determined to be free from faults and the M first optical transceivers are determined to be faulty;

the second controller is configured to receive the fourth indication information, and control the second optical switch group to establish an optical path between the first optical switch group and the fourth optical coupler when it is determined that neither the fourth optical fiber nor the N second optical transceivers have a failure, so as to replace the M failed first optical transceivers with M second optical transceivers corresponding to the M first optical transceivers among the N second optical transceivers to perform transmission of corresponding signal light.

11. The optical communication system according to claim 2, wherein the optical communication system further comprises a fourth optical communication device, a fifth optical communication device, a sixth optical communication device, a fifth optical fiber, a sixth optical fiber, a seventh optical fiber, and an eighth optical fiber, and the dual homing protection device further comprises a fifth optical coupler, a sixth optical coupler, a seventh optical coupler, and an eighth optical coupler;

the fourth optical communication device is connected with the fifth optical coupler through the fifth optical fiber, the fourth optical communication device is further connected with the sixth optical coupler through the sixth optical fiber, the fifth optical coupler is further connected with the first controller and the first optical switch group respectively, the sixth optical coupler is further connected with the second controller and the second optical switch group respectively, the fifth optical communication device is connected with the seventh optical coupler through the seventh optical fiber, the seventh optical coupler is connected with the first controller and the first optical switch group respectively, the sixth optical communication device is connected with the eighth optical coupler through the eighth optical fiber, the eighth optical coupler is further connected with the second controller and the second optical switch group respectively, and the first optical switch group is connected with the second optical switch group through the ninth optical fiber.

12. The optical communication system according to claim 11, wherein;

the first controller is used for controlling the first optical switch group and the second optical switch group to establish a first optical path between the second optical coupler and the third optical coupler in combination with the second controller under the condition that the first optical fiber is determined to be in fault and the third optical fiber and the second optical communication device are not in fault, wherein the first optical path passes through the ninth optical fiber;

the second controller is configured to receive the fifth indication information, and control the second optical switch group to establish a second optical path between the second optical coupler and the fourth optical coupler under the condition that it is determined that the second optical fiber, the fourth optical fiber and the third optical communication device are not faulty, so as to complete transmission of signal light between the second optical communication device and the first optical communication device by the third optical communication device instead of the second optical communication device;

the third optical communication device is configured to send first handover completion indication information to the first controller and the second controller after determining to replace the second optical communication device;

when the first controller and the second controller both receive the first switching completion indication, the first controller controls the first optical switch group and the second optical switch group to disconnect the first optical path by combining with the second controller.

13. The optical communication system according to claim 12, wherein after the first optical path is disconnected, the first controller is further configured to control the first optical switch group to establish an optical path between the seventh optical coupler and the second optical switch group, and send sixth indication information to the second controller;

the second controller is configured to receive the sixth indication information, and control the second optical switch group to establish an optical path between the sixth optical coupler and the first optical switch group when it is determined that the seventh optical fiber is not faulty, so that an optical path is established between the fourth optical communication device and the fifth optical communication device through the sixth optical fiber, the ninth optical fiber and the seventh optical fiber.

14. A double-homing protection method is characterized in that the double-homing protection method is applied to an optical communication system, the optical communication system comprises a double-homing protection device, a first optical communication device, a second optical communication device, a third optical communication device, a first optical fiber, a second optical fiber, a third optical fiber and a fourth optical fiber, the double-homing protection device is connected with the first optical communication device through the first optical fiber and the second optical fiber, the double-homing protection device is connected with the second optical communication device through the third optical fiber, and the double-homing protection device is connected with the third optical communication device through the fourth optical fiber;

the method comprises the following steps:

detecting whether the first optical fiber, the third optical fiber and the second optical communication device have faults or not through the dual-homing protection device;

when one or more of the first optical fiber, the third optical fiber and the second optical communication device is determined to be in fault through a dual-homing protection device, an optical path is established between the first optical fiber and a fourth optical fiber or between the second optical fiber and the third optical fiber or the fourth optical fiber through the dual-homing protection device, so that signal light is transmitted between the first optical communication device and the second optical communication device or the third optical communication device.

15. The method of claim 14, wherein the dual homing protection device comprises: the optical coupler comprises a first optical coupler, a second optical coupler, a third optical coupler, a fourth optical coupler, a first optical switch group, a second optical switch group, a first controller and a second controller, wherein the first optical coupler is respectively connected with the first controller and the first optical switch group, the first controller is respectively connected with the first optical switch group and the third optical coupler, the first optical switch group is also connected with the second optical switch group, the second optical switch group is respectively connected with the second optical coupler, the second controller and the fourth optical coupler, the second controller is respectively connected with the second optical coupler and the fourth optical coupler, the first controller is connected with the second controller, the first optical coupler is connected with the first optical communication device through the first optical fiber, the second optical coupler is connected with the first optical communication device through the second optical fiber, the third optical coupler is connected with the second optical communication device through the third optical fiber, and the fourth optical communication device through the third optical fiber.

16. The method of claim 15, wherein the signal light further comprises a first signal light transmitted to the third optical coupler through the third optical fiber, and wherein the detecting, by the dual homing protection device, whether one or more of the first optical fiber, the third optical fiber, and the second optical communication device is malfunctioning comprises:

splitting the first signal light by the third optical coupler to obtain first sub-signal light and second sub-signal light;

transmitting the first sub-signal light to the first controller through the third optical coupler, and transmitting the second sub-signal light to the first optical switch group;

and when the first controller determines that the optical power of the first sub-signal light is zero or determines that a first optical power difference value between the optical power of the first sub-signal light and a first preset optical power is equal to or greater than a first preset difference value, determining that the third optical fiber has a fault.

17. The method of claim 16, wherein said detecting, by the dual homing protection device, whether one or more of the first optical fiber, the third optical fiber, the second optical communication device is malfunctioning further comprises:

when the first controller determines that the first optical power difference is smaller than the first preset difference, determining, by the first controller, whether the first sub-signal light includes a target set-top signal, where the target set-top signal is a set-top signal preconfigured by the first signal light;

and if the first controller determines that the first sub-signal light does not contain the target set-top signal, determining that the second optical communication device has a fault.

18. The method according to any one of claims 15 to 17, wherein the signal light further includes second signal light transmitted to the second optical coupler through the second optical fiber and third signal light transmitted to the fourth optical coupler through the fourth optical fiber;

the method further comprises the following steps:

splitting the second signal light by the second optical coupler to obtain third sub-signal light and fourth sub-signal light, transmitting the third sub-signal light to the second controller, and transmitting the fourth sub-signal light to the second optical switch group;

splitting the third signal light by the fourth optical coupler to obtain fifth sub-signal light and sixth sub-signal light, transmitting the fifth sub-signal light to the second controller, and transmitting the sixth sub-signal light to the second optical switch group;

determining, by the second controller, whether the second optical fiber is malfunctioning according to the third sub-signal light, and determining, by the second controller, whether the fourth optical fiber and/or the third optical communication device is malfunctioning according to the fifth sub-signal light.

19. The method of claim 18, wherein said establishing an optical path between the first and fourth optical fibers, or between the second and third or fourth optical fibers, through the dual homing protection device comprises:

in the case that the first controller determines that the first optical fiber has a fault and the third optical fiber and the second optical communication device have no fault, controlling the first optical switch group to establish an optical path between the second optical switch group and the third optical coupler through the first controller, and sending first indication information to the second controller;

receiving, by the second controller, the first indication information;

controlling, by the second controller, the second optical switch group to establish an optical path between the second optical coupler and the first optical switch group in the event that it is determined by the second controller that the second optical fiber is non-faulty.

20. The method of claim 18 or 19, wherein said establishing an optical path between said first and fourth optical fibers, or between said second and third or fourth optical fibers, through said dual homing protection device comprises:

in the case that the first controller determines that the first optical fiber is not faulty and the third optical fiber and/or the second optical communication device is faulty, controlling the first optical switch group to establish an optical path between the first optical coupler and the second optical switch group through the first controller, and sending second indication information to the second controller;

receiving, by the second controller, the second indication information, and controlling, by the second controller, the second optical switch group to establish an optical path between the first optical switch group and the fourth optical coupler in a case where it is determined by the second controller that the fourth optical fiber and the third optical communication device are not faulty.

21. The method of any one of claims 18-20, wherein said establishing an optical path between said first optical fiber and a fourth optical fiber, or between said second optical fiber and said third optical fiber or fourth optical fiber, by said dual homing protection device comprises:

sending, by the first controller, third indication information to the second controller in a case where it is determined by the first controller that the first optical fiber and the third optical fiber, or the first optical fiber, the third optical fiber, and the second optical communication device all have a failure;

and receiving the third indication information through the second controller, and controlling the second optical switch group to establish an optical path between the second optical coupler and the fourth optical coupler through the second controller when the second controller determines that the second optical fiber, the fourth optical fiber and the third optical communication device are not in fault.

22. The method according to claim 16, wherein the second optical communication device includes a first combiner-splitter, N first branch optical fibers, and N first optical transceivers, each first optical transceiver is connected to the third optical fiber through one branch optical fiber and the first combiner-splitter, the first sub-signal light is obtained by splitting, by the third optical coupler, the first signal light transmitted by the first combiner-splitter through the third optical fiber, the first signal light is obtained by combining, by the first combiner-splitter, N first branch signal lights transmitted on the N first branch optical fibers, the N first branch signal lights are generated by the N first optical transceivers and transmitted to the N first branch optical fibers, each of the N first branch signal lights is preconfigured with a branch channel-peak-modulated signal, N is a positive integer greater than or equal to 2;

the dual-homing protection device detects whether one or more of the first optical fiber, the third optical fiber and the second optical communication device fails, and comprises:

when the first controller determines that the first optical power difference is smaller than the first preset difference, determining, by the first controller, whether the first sub-signal light includes the N pre-configured branch signal lights of the first branch signal light;

if the first controller determines that the first sub-signal light does not include a branch line pilot tone signal pre-configured by M first branch signal lights of the N first branch signal lights, it is determined that M first optical transceivers for generating the M first branch signal lights have a failure, where M is a positive integer greater than or equal to 1.

23. The method of claim 22, wherein the third optical communication device comprises a second combiner/splitter, N second tributary optical fibers, and N second optical transceivers, each of the second optical transceivers is connected to the fourth optical fiber through one second tributary optical fiber and the second combiner/splitter, and the N first optical transceivers are in one-to-one correspondence with the N second optical transceivers;

the establishing an optical path between the first optical fiber and a fourth optical fiber or between the second optical fiber and the third optical fiber or the fourth optical fiber by the dual homing protection device includes:

transmitting fourth indication information to the second controller in case it is determined by the first controller that the M first optical transceivers have failed;

receiving, by the second controller, the fourth indication information;

under the condition that the second controller determines that the second optical fiber, the fourth optical fiber and the third optical communication device are not in fault, the second controller controls the second optical switch group to establish an optical path between the second optical fiber and the fourth optical fiber, so that M second optical transceivers corresponding to the M first optical transceivers in the N second optical transceivers replace the M first optical transceivers in fault to transmit corresponding signal light.

24. The method of claim 15, wherein the optical communication system further comprises a fourth optical communication device, a fifth optical communication device, a sixth optical communication device, a fifth optical fiber, a sixth optical fiber, a seventh optical fiber, and an eighth optical fiber, and wherein the dual homing protection device further comprises a fifth optical coupler, a sixth optical coupler, a seventh optical coupler, and an eighth optical coupler;

25. The method of claim 24, wherein after determining by the first controller and the second controller that the first optical fiber is faulty and that the third optical fiber and the second optical communication device are non-faulty and controlling the first optical switch set and the second optical switch set to establish the first optical path between the second optical coupler and the third optical coupler, the method further comprises:

when it is determined that the fifth optical fiber has a failure according to the sub signal light provided by the fifth optical coupler and it is determined that the seventh optical fiber and the fifth optical communication device have no failure according to the sub signal light provided by the seventh optical coupler, the first controller transmits fifth indication information to the second controller;

and the second controller is used for the fifth indication information, and under the condition that the second optical fiber, the fourth optical fiber and the third optical communication device are determined to be fault-free, the second optical switch group is controlled to establish a second optical path between the second optical coupler and the fourth optical coupler, so that the third optical communication device replaces the second optical communication device to complete the transmission of the signal light between the second optical communication device and the first optical communication device.

26. The method of claim 25, further comprising:

when a second switching completion indication from the third optical communication device is received through the first controller and the second controller, the first optical switch group and the second optical switch group are controlled to disconnect the first optical path through the first controller and the second controller, wherein the second switching completion indication information is generated and sent by the third optical communication device after the third optical communication device is determined to replace the second optical communication device.

27. The method of claim 26, wherein after disconnecting the first optical path, the method further comprises:

controlling the first optical switch group to establish an optical path between the seventh optical coupler and the second optical switch group through the first controller, and sending sixth indication information to the second controller;

and receiving, by the second controller, the sixth indication information, and controlling, in a case where it is determined that the seventh optical fiber is not faulty, the second optical switch group to establish an optical path between the sixth optical coupler and the first optical switch group, so that an optical path is established between the fourth optical communication device and the fifth optical communication device through the sixth optical fiber, the ninth optical fiber, and the seventh optical fiber.

28. A communication system, characterized in that the communication system comprises a first communication device, an optical communication system according to any of claims 1-13, and a second communication device, the first communication device establishing a communication connection with the second communication device through the optical communication system;

the optical communication system is used for transmitting service data between the first communication equipment and the second communication equipment.

29. The communication system according to claim 28, wherein the first communication device is a terminal device, the second communication device is a backhaul device, the first optical communication apparatus in the optical communication system includes an active antenna unit AAU or a radio remote unit RRU, and the second optical communication apparatus and the third optical communication apparatus in the optical communication system include a baseband processing unit BBU or a distributed unit DU.

30. The communication system according to claim 28, wherein the first communication device is an end device, the second communication device is a public cloud device, the first optical communication device in the optical communication system is a Customer Premises Equipment (CPE), and the second optical communication device and the third optical communication device are cloud point of presence (POP) devices.