CN114204986A

CN114204986A - Method, device, system and storage medium for detecting optical link fault

Info

Publication number: CN114204986A
Application number: CN202010982303.3A
Authority: CN
Inventors: 杜喆; 刘刚; 闫飞; 吴飞; 梁轶
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2022-03-18

Abstract

The invention discloses a method, a device and a system for detecting optical link faults and a storage medium, and relates to the technical field of optical fiber communication. The method for detecting the optical link fault comprises the following steps: determining one or more fault channels in a wavelength division multiplexing based fronthaul system, wherein each channel in the fronthaul system comprises a tunable Optical Network Unit (ONU); issuing a wavelength tuning instruction to an ONU (optical network unit) of a target fault channel, wherein the wavelength tuning instruction comprises a fault elimination wavelength and is used for indicating the ONU to work according to the fault elimination wavelength, and the fault elimination wavelength is a normal working wavelength corresponding to the target fault channel or other fault channels; and determining the fault type of the target suspected channel according to the working condition of the target fault channel. The embodiment of the invention utilizes the tunable characteristic of the ONU in the forwarding system, determines the fault reason by resetting the wavelength of the ONU, and can quickly and effectively determine the fault type.

Description

Method, device, system and storage medium for detecting optical link fault

Technical Field

The present invention relates to the field of optical fiber communication technologies, and in particular, to a method, an apparatus, a system, and a storage medium for detecting an optical link failure.

Background

In the 5G era, a Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) can be used as a forward transport bearer scheme.

The WDM-PON system can adopt a wavelength laser scheme with adjustable Optical Network Unit (ONU) side. In an initial state of system operation, each ONU-side tunable laser is not configured with any transmission and reception wavelengths, i.e. is in a "colorless" state. In a WDM-PON system, the upstream and downstream wavelengths allowed to pass through by each port of an Arrayed Waveguide Grating (AWG) are fixed. When an ONU is allocated under a certain AWG port, the uplink and downlink working wavelengths of the ONU are also determined.

Disclosure of Invention

The embodiment of the invention aims to solve the technical problem that: how to quickly and efficiently determine the type of failure when a fronthaul system including a tunable ONU fails.

According to a first aspect of some embodiments of the present invention, there is provided a method of detecting an optical link failure, comprising: determining one or more fault channels in a wavelength division multiplexing based fronthaul system, wherein each channel in the fronthaul system comprises a tunable Optical Network Unit (ONU); issuing a wavelength tuning instruction to an ONU (optical network unit) of a target fault channel, wherein the wavelength tuning instruction comprises a fault elimination wavelength and is used for indicating the ONU to work according to the fault elimination wavelength, and the fault elimination wavelength is a normal working wavelength corresponding to the target fault channel or other fault channels; and determining the fault type of the target suspected channel according to the working condition of the target fault channel.

In some embodiments, the wavelength tuning instruction is a first wavelength tuning instruction, and the obstacle elimination wavelength is a normal working wavelength corresponding to the target fault channel; determining the fault type of the target suspected channel according to the working condition of the target fault channel comprises the following steps: and after the ONU of the target fault channel works based on the first wavelength tuning instruction, determining the fault type of the target fault channel as a tuning configuration error under the condition that the target fault channel recovers to work normally.

In some embodiments, the wavelength tuning instruction is a second wavelength tuning instruction, and the obstacle elimination wavelength is a normal working wavelength corresponding to a fault channel other than the target fault channel; determining the fault type of the target suspected channel according to the working condition of the target fault channel comprises the following steps: and after the ONU of the target fault channel works based on the second wavelength tuning instruction, determining the fault type of the target fault channel as the optical fiber connection error under the condition that the target fault channel recovers to work normally.

In some embodiments, the wavelength tuning instruction includes a first wavelength tuning instruction and a plurality of second wavelength tuning instructions, the barrier wavelength in the first wavelength tuning instruction is the normal operating wavelength corresponding to the target fault channel, and the barrier wavelength in each second wavelength tuning instruction is the normal operating wavelength corresponding to the other fault channels except the target fault channel; determining the fault type of the target suspected channel according to the working condition of the target fault channel comprises the following steps: and after the ONU of the target fault channel works based on the first wavelength tuning instruction and the plurality of second wavelength tuning instructions, determining that the fault type of the target fault channel is the port fault under the condition that the target fault channel does not recover normal work.

In some embodiments, determining one or more failed lanes in the fronthaul system comprises: determining a channel which normally works in a forwarding system; and determining the channel with normal light receiving and abnormal light sending as a fault channel in the channels with abnormal work.

In some embodiments, the fronthaul system is located in a 5G fronthaul system.

In some embodiments, the OLT of the target failure channel issues a wavelength tuning instruction to the ONU of the target failure channel.

According to a second aspect of some embodiments of the present invention, there is provided an apparatus for detecting an optical link failure, comprising: a fault channel determination module configured to determine one or more fault channels in a wavelength division multiplexing based fronthaul system, wherein each channel in the fronthaul system includes a tunable ONU; the device comprises an instruction sending module, a wavelength tuning module and a wavelength tuning module, wherein the instruction sending module is configured to send a wavelength tuning instruction to the ONU of a target fault channel, the wavelength tuning instruction comprises a fault elimination wavelength and is used for indicating the ONU to work according to the fault elimination wavelength, and the fault elimination wavelength is a normal working wavelength corresponding to the target fault channel or other fault channels; and the fault type determination module is configured to determine the fault type of the target suspected channel according to the working condition of the target fault channel.

According to a third aspect of some embodiments of the invention, there is provided a system for detection of optical link failure, comprising: the detection device of the aforesaid optical link trouble; and a wavelength division multiplexing based fronthaul system.

In some embodiments, at least one of the failure channel determination module, or the instruction sending module in the detection apparatus of the optical link failure is integrated with the OLT in the fronthaul system.

According to a fourth aspect of some embodiments of the present invention, there is provided an apparatus for detecting an optical link failure, comprising: a memory; and a processor coupled to the memory, the processor configured to perform any of the foregoing methods of detecting an optical link failure based on instructions stored in the memory.

According to a fifth aspect of some embodiments of the present invention, there is provided a computer readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements any one of the methods for detecting an optical link failure described above.

Some embodiments of the above invention have the following advantages or benefits. The embodiment of the invention utilizes the tunable characteristic of the ONU in the forwarding system, determines the fault reason by resetting the wavelength of the ONU, and can quickly and effectively determine the fault type.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 exemplarily shows a structural schematic diagram of a 5G forwarding system.

Fig. 2 illustrates a flow diagram of a method of detection of an optical link failure in accordance with some embodiments of the invention.

Fig. 3 is a flow chart illustrating a method of detecting an optical link failure according to further embodiments of the present invention.

FIG. 4 illustrates a flow diagram of a method for fault path determination according to some embodiments of the invention.

Fig. 5 shows a schematic block diagram of an apparatus for detecting an optical link failure according to some embodiments of the present invention.

Fig. 6 illustrates a schematic structural diagram of a detection system for optical link failure according to some embodiments of the present invention.

Fig. 7 is a schematic structural diagram of an apparatus for detecting an optical link failure according to further embodiments of the present invention.

Fig. 8 shows a schematic structural diagram of an apparatus for detecting an optical link failure according to further embodiments of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Because the 5G system has various requirements such as large bandwidth and low time delay, the required amount of the 5G forward transmission system for optical fiber resources is also large. In order to meet the use of the 5G system, tunable ONUs are used in the WDM-PON system so as to meet the requirements of various services. Fig. 1 exemplarily shows a structural schematic diagram of a 5G forwarding system. In fig. 1, CU/DU is connected to OLT through interfaces CP1 ', CP 2', CP3 ', … … CPn' and interfaces CP1, CP2, CP3, … … CPn in WDM-PON system; AAU1, AAU2, AAU3, … …, AAUn are connected to ONU1, ONU2, ONU3, … …, ONUn in the WDM-PON system, respectively, and each ONU is tunable. The OLT is connected with each ONU through the AWG, wherein the AWG is respectively connected with each ONU through interfaces A1, A2, A3, … … and An. Each pair of OLT interface CP and ONU corresponds to one working channel, for example, OLT CP1 and ONU1 correspond to channel 1.

The inventors have realized that when performing optical link failure diagnostics, the type of failure may be determined based on the characteristics of the tunable ONUs in such systems. An embodiment of the method of detecting an optical link failure of the present invention is described below with reference to fig. 1.

Fig. 2 illustrates a flow diagram of a method of detection of an optical link failure in accordance with some embodiments of the invention. As shown in fig. 2, the method for detecting an optical link failure of this embodiment includes steps S202 to S206.

In step S202, one or more faulty channels in a wavelength division multiplexing based fronthaul system are determined, wherein each channel in the fronthaul system includes a tunable ONU.

A failed channel is a channel that is in operation but is not operating properly. In the 5G forwarding system, for a channel in an open state, that is, a working state, an uplink link, a PON port link, or a downlink link thereof may be detected. The uplink link refers to a link between the CU/DU and the OLT, the PON port link refers to a link between the OLT and the ONU, and the downlink link refers to a link between the ONU and the AAU. For example, a channel that can normally receive traffic of a CU (Centralized Unit)/DU (Distributed Unit), but the OLT side sends the traffic abnormality may be determined as a faulty channel.

In step S204, a wavelength tuning instruction is issued to the ONU in the target failure channel, where the wavelength tuning instruction includes a fault elimination wavelength and is used to instruct the ONU to operate according to the fault elimination wavelength, and the fault elimination wavelength is a normal operating wavelength corresponding to the target failure channel or another failure channel.

In some embodiments, the OLT of the target failure channel issues a wavelength tuning instruction to the ONU of the target failure channel. Thus, the operating wavelength of the ONU can be adjusted by using the control function of the OLT.

The target failed channel refers to a certain channel of the determined one or more failed channels. When performing fault detection, each fault channel may be sequentially used as a target fault channel.

Each ONU, although tunable, should operate using the configured normal operating wavelength in a normal operating state. For example, after assigning a correspondence between an ONU and a certain port of the AWG, the ONU should access the port and operate using the corresponding operating wavelength. If the wavelength configured by the ONU is wrong or the ONU accesses the wrong port, the channel may be abnormal.

Therefore, the inventor thought that it is possible to determine the type of failure by setting the wavelength of the ONU to detect and eliminate the failure and attempting to set the ONU at the normal operating wavelength of the failed channel, using the feature that the ONU is tunable in such a system.

In some embodiments, the association relationship between the identifier of each channel and the corresponding normal operating wavelength of the channel is recorded in advance.

In step S206, the fault type of the target suspected channel is determined according to the working condition of the target faulty channel.

In some embodiments, the wavelength tuning instruction is a first wavelength tuning instruction, and the fault elimination wavelength in the first wavelength tuning instruction is a normal operating wavelength corresponding to the target fault channel. That is, it is determined whether the channel failure is caused by an ONU wavelength setting error.

After the ONU of the target fault channel works based on the first wavelength tuning instruction, under the condition that the target fault channel recovers to work normally, namely under the condition that the working channel is normally established, the fault type of the target fault channel is determined to be a tuning configuration error. That is, the ONU is connected to the correct port but the wavelength configuration is incorrect. If the target fault channel still does not recover to work normally, the fault type with wrong tuning configuration can be eliminated, and other detection means are adopted for further judgment.

In some embodiments, the wavelength tuning instruction is a second wavelength tuning instruction, and the barrier wavelength in the second wavelength tuning instruction is a normal operating wavelength corresponding to a fault channel other than the target fault channel. That is, it is attempted to set the ONU with the normal operating wavelength of the other failed channel to detect whether it is a port connection error.

And after the ONU of the target fault channel works based on the second wavelength tuning instruction, determining the fault type of the target fault channel as the optical fiber connection error under the condition that the target fault channel recovers to work normally. If the target fault channel still does not work normally, the fault type of the optical fiber connection error can be eliminated, and other detection means are adopted for further judgment.

In some embodiments, the plurality of second wavelength tuning instructions may be transmitted sequentially before determining the type of fault. For example, after sending a second wavelength tuning command comprising the normal operating wavelength of the other failed channel, if the target failed channel has not yet recovered normal operation, then a second wavelength tuning command comprising the normal operating wavelength of another other failed channel is sent, and so on.

In some embodiments, after the ONU on the target failed channel operates based on the first wavelength tuning instruction and the second wavelength tuning instruction, determining that the failure type of the target failed channel is a port failure when the target failed channel does not recover to operate normally.

The embodiment utilizes the tunable characteristic of the ONU in the forwarding system, determines the fault reason by resetting the wavelength of the ONU, and can quickly and effectively determine the fault type.

For 5G forwarding networks, tunable ONUs are used in order to be able to withstand the consumption of more fiber resources. Therefore, when the embodiment of the invention is applied to a 5G forwarding network, the fault type in the network can be quickly and effectively determined, and the fault can be solved. Therefore, the availability of the 5G forwarding network is improved.

An embodiment of fault detection based on the first wavelength tuning instruction, the second wavelength tuning instruction is described below with reference to fig. 3.

Fig. 3 is a flow chart illustrating a method of detecting an optical link failure according to further embodiments of the present invention. As shown in fig. 3, the method for detecting an optical link failure of this embodiment includes steps S302 to S310.

In step S302, one or more faulty channels in a wavelength division multiplexing based fronthaul system are determined, wherein each channel in the fronthaul system includes a tunable ONU.

In step S304, a first wavelength tuning instruction is issued to the ONU in the target failure channel, and a barrier wavelength in the first wavelength tuning instruction is a normal operating wavelength corresponding to the target failure channel.

In step S306, it is determined whether the target failed channel returns to normal operation. If so, determining the fault type as a tuning configuration error; if not, step S308 is performed.

In step S308, a plurality of second wavelength tuning instructions are issued to the ONU in the target failure channel in sequence, and the fault elimination wavelength in each second wavelength tuning instruction is the normal operating wavelength corresponding to the other failure channels except the target failure channel.

In step S310, it is determined whether the target failed channel returns to normal operation. If so, determining the fault type as an optical fiber connection error; and if the target fault channel does not return to normal operation after all the second wavelength tuning instructions are sent, determining that the fault type of the target fault channel is the port fault.

For the optical fiber connection error type link, the ONU with the connection error can be connected to the correct port according to the wavelength pre-configured for each AWG port.

By the method of the embodiment, the fault type can be determined sequentially through the sending of the wavelength tuning instruction, and the efficiency and the accuracy of fault detection are improved.

An embodiment of the faulty pathway determination method is described below with reference to fig. 4.

FIG. 4 illustrates a flow diagram of a method for fault path determination according to some embodiments of the invention. As shown in fig. 4, the faulty pathway determination method of this embodiment includes steps S402 to S404.

In step S402, a channel that normally operates in the forwarding system is determined. For example, a heartbeat mechanism is established to periodically count the number of working channels that are working normally in the PON port.

In step S404, a channel that normally receives light and abnormally transmits light among the channels that do not normally operate is determined as a faulty channel.

Among the channels that are not working normally, the channels that are not opened and the channels that are suspected to be faulty are included. Therefore, by identifying the channel which receives light normally and sends light abnormally, the channel which is not opened can be prevented from being brought into the fault elimination range.

Through the embodiment, the fault channel can be accurately identified.

An embodiment of the detection apparatus for an optical link failure of the present invention is described below with reference to fig. 5.

Fig. 5 shows a schematic block diagram of an apparatus for detecting an optical link failure according to some embodiments of the present invention. As shown in fig. 5, the optical link failure detection apparatus 500 of this embodiment includes: a faulty channel determination module 5100 configured to determine one or more faulty channels in a wavelength division multiplexing based fronthaul system, wherein each channel in the fronthaul system includes a tunable ONU; the instruction sending module 5200 is configured to issue a wavelength tuning instruction to the ONU in the target failed channel, where the wavelength tuning instruction includes a barrier removal wavelength and is used to instruct the ONU to operate according to the barrier removal wavelength, and the barrier removal wavelength is a normal operating wavelength corresponding to the target failed channel or another failed channel; the fault type determining module 5300 is configured to determine a fault type of the target suspected channel according to a working condition of the target faulty channel.

In some embodiments, the wavelength tuning instruction is a first wavelength tuning instruction, and the obstacle elimination wavelength is a normal working wavelength corresponding to the target fault channel; the fault type determination module 5300 is further configured to determine that the fault type of the target faulty channel is a tuning configuration error when the target faulty channel recovers to operate normally after the ONU of the target faulty channel operates based on the first wavelength tuning instruction.

In some embodiments, the wavelength tuning instruction is a second wavelength tuning instruction, and the obstacle elimination wavelength is a normal working wavelength corresponding to a fault channel other than the target fault channel; the fault type determination module 5300 is further configured to determine that the fault type of the target faulty channel is an optical fiber connection error when the target faulty channel recovers to operate normally after the ONU of the target faulty channel operates based on the second wavelength tuning instruction.

In some embodiments, the wavelength tuning instruction includes a first wavelength tuning instruction and a plurality of second wavelength tuning instructions, the barrier wavelength in the first wavelength tuning instruction is the normal operating wavelength corresponding to the target fault channel, and the barrier wavelength in each second wavelength tuning instruction is the normal operating wavelength corresponding to the other fault channels except the target fault channel; the fault type determination module 5300 is further configured to determine that the fault type of the target faulty channel is a port fault if none of the target faulty channels recovers to operate normally after the ONU of the target faulty channel operates based on the first wavelength tuning instruction and the plurality of second wavelength tuning instructions.

In some embodiments, the faulty lane determination module 5100 is further configured to determine a lane in the fronthaul system that is functioning properly; and determining the channel with normal light receiving and abnormal light sending as a fault channel in the channels with abnormal work.

In some embodiments, the fronthaul system is located in a 5G fronthaul system.

In some embodiments, the instruction sending module 5200 is further configured to issue the wavelength tuning instruction to the ONU of the target failed channel through the OLT of the target failed channel.

The detection system for optical link failure of the present invention is described below with reference to fig. 6.

Fig. 6 illustrates a schematic structural diagram of a detection system for optical link failure according to some embodiments of the present invention. As shown in fig. 6, the optical link failure detection system 60 of this embodiment includes: the optical link failure detection apparatus 610, whose specific embodiment can refer to the optical link failure detection apparatus 500; and a wavelength division multiplexing based fronthaul system 620.

In some embodiments, the fronthaul system 620 is a 5G fronthaul system.

Fig. 7 is a schematic structural diagram of an apparatus for detecting an optical link failure according to further embodiments of the present invention. As shown in fig. 7, the optical link failure detection apparatus 70 of this embodiment includes: a memory 710 and a processor 720 coupled to the memory 710, the processor 720 being configured to perform the method for detecting an optical link failure in any of the foregoing embodiments based on instructions stored in the memory 710.

Memory 710 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.

Fig. 8 shows a schematic structural diagram of an apparatus for detecting an optical link failure according to further embodiments of the present invention. As shown in fig. 8, the optical link failure detection apparatus 80 of this embodiment includes: the memory 810 and the processor 820 may further include an input/output interface 830, a network interface 840, a storage interface 850, and the like. These

interfaces

830, 840, 850 and the memory 810 and the processor 820 may be connected, for example, by a bus 860. The input/output interface 830 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 840 provides a connection interface for various networking devices. The storage interface 850 provides a connection interface for external storage devices such as an SD card and a usb disk.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program is configured to implement any one of the foregoing methods for detecting an optical link failure when executed by a processor.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A method of detecting an optical link failure, comprising:

determining one or more fault channels in a wavelength division multiplexing based fronthaul system, wherein each channel in the fronthaul system comprises a tunable Optical Network Unit (ONU);

issuing a wavelength tuning instruction to an ONU (optical network unit) of a target fault channel, wherein the wavelength tuning instruction comprises a fault elimination wavelength and is used for indicating the ONU to work according to the fault elimination wavelength, and the fault elimination wavelength is a normal working wavelength corresponding to the target fault channel or other fault channels;

and determining the fault type of the target suspected channel according to the working condition of the target fault channel.

2. The detection method according to claim 1, wherein the wavelength tuning instruction is a first wavelength tuning instruction, and the obstacle elimination wavelength is a normal operating wavelength corresponding to the target fault channel;

the determining the fault type of the suspected target channel according to the working condition of the target fault channel includes:

and after the ONU of the target fault channel works based on the first wavelength tuning instruction, determining the fault type of the target fault channel as a tuning configuration error under the condition that the target fault channel recovers to work normally.

3. The detection method according to claim 1, wherein the wavelength tuning instruction is a second wavelength tuning instruction, and the barrier wavelength is a normal operating wavelength corresponding to a fault channel other than the target fault channel;

and after the ONU of the target fault channel works based on the second wavelength tuning instruction, determining that the fault type of the target fault channel is an optical fiber connection error under the condition that the target fault channel recovers to work normally.

4. The detection method according to claim 1, wherein the wavelength tuning instruction includes a first wavelength tuning instruction and a plurality of second wavelength tuning instructions, a barrier wavelength in the first wavelength tuning instruction is a normal operating wavelength corresponding to the target fault channel, and a barrier wavelength in each second wavelength tuning instruction is a normal operating wavelength corresponding to a fault channel other than the target fault channel;

and determining that the fault type of the target fault channel is a port fault under the condition that the target fault channel does not recover normal work after the ONU of the target fault channel works based on the first wavelength tuning instruction and the plurality of second wavelength tuning instructions.

5. The detection method of claim 1, wherein the determining one or more failed lanes in a fronthaul system comprises:

determining a channel which normally works in a forwarding system;

and determining the channel with normal light receiving and abnormal light sending as a fault channel in the channels with abnormal work.

6. The detection method according to claim 1, wherein the forwarding system is located in a 5G forwarding system.

7. The detection method according to claim 1, wherein a wavelength tuning instruction is issued to the ONU of the target failed channel by the OLT of the target failed channel.

8. An apparatus for detecting an optical link failure, comprising:

a failure channel determination module configured to determine one or more failure channels in a wavelength division multiplexing based fronthaul system, wherein each channel in the fronthaul system includes a tunable ONU;

the device comprises an instruction sending module and a wavelength tuning module, wherein the instruction sending module is configured to send a wavelength tuning instruction to an ONU (optical network unit) of a target fault channel, the wavelength tuning instruction comprises a fault elimination wavelength and is used for indicating the ONU to work according to the fault elimination wavelength, and the fault elimination wavelength is a normal working wavelength corresponding to the target fault channel or other fault channels;

and the fault type determination module is configured to determine the fault type of the target suspected channel according to the working condition of the target fault channel.

9. A system for detecting an optical link failure, comprising:

the optical link failure detection apparatus of claim 8; and

a wavelength division multiplexing based fronthaul system.

10. The detection system of claim 9, wherein at least one of the failure channel determination module or the instruction transmission module in the detection apparatus of the optical link failure is integrated with the OLT in the fronthaul system.

11. An apparatus for detecting an optical link failure, comprising:

a memory; and

a processor coupled to the memory, the processor configured to perform the method of detecting an optical link failure according to any one of claims 1-7 based on instructions stored in the memory.

12. A computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the method of detecting an optical link failure according to any one of claims 1 to 7.