CN112929079B

CN112929079B - Fault detection device and method for optical fiber link and optical communication system

Info

Publication number: CN112929079B
Application number: CN201911233733.9A
Authority: CN
Inventors: 王磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2022-09-16
Anticipated expiration: 2039-12-05
Also published as: CN112929079A

Abstract

The application provides a fault detection device and method for an optical fiber link and an optical communication system, and belongs to the technical field of optical communication. The sensing optics in the fault detection apparatus may generate a sensing optical signal, and the first and second sensing optical transmission components may transmit the sensing optical signal to the sensing optics via the first and second optical fibers, such that the sensing optics may detect a sensing optical power of the received sensing optical signal. Two optical power detectors in the fault detection device can respectively detect the service optical power of the service optical signal transmitted in one optical fiber. Through the scheme provided by the application, even if the two optical power detectors do not detect the service optical power, the fault locator can accurately determine whether the first optical fiber and the second optical fiber have the fault optical fiber according to the detected optical power, so that the precision of fault location of the optical fiber link is effectively improved.

Description

Fault detection device and method for optical fiber link and optical communication system

Technical Field

The present application relates to the field of optical communication technologies, and in particular, to a device and a method for detecting a fault of an optical fiber link, and an optical communication system.

Background

In an access network of a fifth generation mobile communication network (5G), an indoor baseband unit (BBU) and an Active Antenna Unit (AAU) are connected by an optical fiber link, and signal interaction is realized by using a Wavelength Division Multiplexing (WDM) technology.

In the related art, the optical fiber link generally includes: the optical transceiver device is located at the AAU side, the optical transceiver device is located at the BBU side, and the two optical fibers are connected with the two optical transceiver devices. The optical transceiver on the BBU side is also provided with an optical switch, which can switch between two optical fibers for communicating the two optical transceivers. In addition, the BBU side is further provided with two Photo Detectors (PDs), each PD is connected to one optical fiber, and is configured to detect power of a service optical signal transmitted by an optical transceiver device on the AAU side. If a PD does not detect the power of the service optical signal, it can be determined that the optical fiber connected to the PD has a fault. Thus, the optical fiber for connecting the two optical transmission/reception devices can be switched by the optical switch based on the failure of the two optical fibers detected by the two PDs.

However, if the optical transceiver device on the AAU side has a fault, both PDs cannot detect the power of the service optical signal transmitted by the optical transceiver device on the AAU side, and at this time, it cannot be determined whether or not two optical fibers in the optical fiber link have a fault.

Disclosure of Invention

The application provides a fault detection device and method for an optical fiber link and an optical communication system, which can solve the problem that whether the optical fiber in the optical fiber link has a fault or not can not be accurately determined based on the detection result of a PD in the related technology, and the technical scheme is as follows:

in one aspect, an apparatus for detecting a failure of an optical fiber link is provided, where the optical fiber link may include a first optical transceiver device, a second optical transceiver device, and a plurality of optical fibers connected between the first optical transceiver device and the second optical transceiver device, where the plurality of optical fibers includes a first optical fiber and a second optical fiber; the failure detection device includes: a detection optics, a first detection optical transmission assembly, a second detection optical transmission assembly, a first optical power detector, a second optical power detector, and a fault locator;

the detection optical device is used for generating a detection optical signal and transmitting the detection optical signal to the first detection optical transmission component; the first detection light transmission component is used for transmitting the detection light signal received from the detection light device to the first optical fiber; the second detection light transmission component is used for transmitting the detection light signal transmitted in the first optical fiber to the second optical fiber; the first detection light transmission component is also used for transmitting the detection light signal transmitted in the second optical fiber to the detection light device; the detection light device is also used for detecting the detection light power of the detection light signal received from the first detection light transmission component; the first optical power detector is connected to the first optical fiber and configured to detect a first service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the first optical fiber; the second optical power detector is connected to the second optical fiber and configured to detect a second service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the second optical fiber; the fault locator is configured to determine a fault location in the optical fiber link according to the detected optical power, the first service optical power, and the second service optical power.

By the scheme provided by the embodiment of the application, even if the second optical transceiver in the optical fiber link has a fault, and the two optical power detectors cannot detect the service optical power, the fault locator can accurately determine whether the fault optical fiber exists in the first optical fiber and the second optical fiber based on the detection optical power, so that the precision of fault location of the optical fiber link is effectively improved.

Optionally, the first detection light transmission assembly may include: a first detection optical multiplexer and a first detection optical filter; the first detection optical multiplexer is respectively connected with the detection optical device and the first optical fiber, and is configured to multiplex a detection optical signal received from the detection optical device and a service optical signal received from the first optical transceiver device, and transmit the multiplexed optical signal to the first optical fiber; the first detection optical filter is respectively connected with the detection optical device and the second optical fiber, and is used for performing wave division on the combined optical signal transmitted in the second optical fiber to obtain a detection optical signal and transmitting the detection optical signal to the detection optical device.

The first detection optical filter may further perform wavelength division on the combined optical signal transmitted in the second optical fiber to obtain a service optical signal transmitted by the second optical transceiver device, and the first detection optical filter may further transmit the service optical signal to the first optical transceiver device.

Optionally, the second detection light transmission assembly includes: a second detection optical multiplexer and a second detection optical filter; the second detection optical filter is respectively connected with the first optical fiber and the second detection optical multiplexer, and is used for performing wave splitting on the combined optical signal transmitted in the first optical fiber to obtain a detection optical signal and transmitting the detection optical signal to the second detection optical multiplexer; the second optical combiner is connected to the second optical fiber, and configured to combine the service optical signal received from the second optical transceiver with the detection optical signal received from the second optical filter, and transmit the combined optical signal to the second optical fiber.

The second detection optical filter may further perform wavelength division on the combined optical signal transmitted in the first optical fiber to obtain a service optical signal transmitted by the first optical transceiver device, and the second detection optical filter may further transmit the service optical signal to the second optical transceiver device.

In the embodiment of the application, each detection optical transmission assembly comprises a detection optical wave combiner and a detection optical wave filter, so that the transmission of detection optical signals in the first optical fiber and the second optical fiber can be realized, and the normal transmission of service optical signals can be ensured.

Optionally, the plurality of optical fibers may further include: an even number of third optical fibers; the device also includes: an even number of third optical power detectors; the second detection light transmission assembly includes: a first sub-transport component, one or more second sub-transport components, and a third sub-transport component;

the first sub-transmission assembly is respectively connected with the first optical fiber and one third optical fiber and is used for transmitting the detection optical signal transmitted in the first optical fiber to the third optical fiber; each second sub-transmission assembly is respectively connected with the two third optical fibers and is used for transmitting the detection optical signal transmitted in one third optical fiber to the other third optical fiber; the third sub-transmission assembly is respectively connected with the second optical fiber and one third optical fiber and is used for transmitting the detection optical signal transmitted in the third optical fiber to the second optical fiber, wherein the third sub-transmission assembly and the first sub-transmission assembly are connected with different third optical fibers; each third optical power detector is connected with one third optical fiber and is used for detecting third service optical power of a service optical signal transmitted to the first optical transceiver device by the second optical transceiver device through the third optical fiber; the fault locator is configured to determine a fault location in the optical fiber link according to the detected optical power, the first service optical power, the second service optical power, and the third service optical power.

For a scenario where the optical fiber link includes more than two optical fibers, the second detection optical transmission component may sequentially connect the first optical fiber, the even number of third optical fibers, and the second optical fiber in series, so that a transmission path of the detection optical signal may traverse a plurality of optical fibers included in the optical fiber link, thereby implementing accurate detection of a fault condition of the plurality of optical fibers.

Optionally, the apparatus may further include: a first splitter and a second splitter; the first optical splitter is connected to the first optical fiber and the first optical power detector, and configured to split the service optical signal transmitted by the second optical transceiver device through the first optical fiber to obtain a first split optical signal and a second split optical signal, transmit the first split optical signal to the first optical power detector, and transmit the second split optical signal to the first optical transceiver device; the second optical splitter is connected to the second optical fiber and the second optical power detector, and configured to split the service optical signal transmitted by the second optical transceiver device through the second optical fiber to obtain a third optical splitting signal and a fourth optical splitting signal, transmit the third optical splitting signal to the second optical power detector, and transmit the fourth optical splitting signal to the first optical transceiver device; the power of the second optical splitting signal is greater than that of the first optical splitting signal, and the power of the fourth optical splitting signal is greater than that of the third optical splitting signal.

In the embodiment of the application, each wave splitter can only transmit a small number of service optical signals to the optical power detector to perform optical power detection, so that the influence on the normal operation of the service can be avoided.

Optionally, the service optical signal sent by the second optical transceiver device includes an optical signal with one or more wavelengths; the device also includes: a first service optical filter and a second service optical filter; the first service optical filter is respectively connected with the first splitter and the first optical power detector, and is configured to filter a first split optical signal received from the first splitter to obtain a first sub-split optical signal with a target wavelength in the one or more wavelengths, and transmit the first sub-split optical signal to the first optical power detector; the second service optical filter is connected to the second splitter and the second optical power detector, and is configured to filter a third optical splitting signal received from the second splitter to obtain a second sub optical splitting signal of a target wavelength in the one or more wavelengths, and transmit the second sub optical splitting signal of the target wavelength to the second optical power detector.

Because the wavelength of the service optical signal sent by the first optical transceiver device is different from that of the service optical signal sent by the second optical transceiver device, the service filter is used for filtering the sub-split optical signal with the target wavelength in the service optical signal sent by the second optical transceiver device, so that only the sub-split optical signal with the target wavelength can be transmitted to the optical power detector when the optical fiber is broken, the service optical signal sent by the first optical transceiver device is prevented from being reflected to the optical power detector at the broken fiber position, and the accuracy of the detection result of the optical power detector is ensured.

Optionally, the first optical transceiver device may include: an optical switch connected to each optical fiber; the service optical signal sent by the second optical transceiver device comprises optical signals with a plurality of wavelengths; the apparatus may further include: a multi-wave power detector; the multi-wave power detector is respectively connected with the optical switch and the fault locator, and is used for detecting the single-wave optical power of the optical signal with each wavelength in the service optical signal sent by the second optical transceiver device and received by the optical switch; the fault locator is configured to determine a fault location in the optical fiber link according to the detected optical power, the first service optical power, the second service optical power, and the single-wave optical power.

The fault locator can determine whether each optical module in the second optical transceiver has a fault or not based on the single-wave optical power of the optical signal with each wavelength, so that the fault locating precision is further improved.

Optionally, the fault locator may be further connected to the optical switch, and the fault locator is further configured to control the optical switch to switch the optical fiber for communicating the first optical transceiver device and the second optical transceiver device to another optical fiber when detecting that there is a fault in the optical fiber currently used for communicating the first optical transceiver device and the second optical transceiver device. Therefore, normal transmission of service optical signals can be ensured, and the reliability of the optical fiber link is improved.

Optionally, the fault locator may be configured to:

if the detected optical power, the first service optical power and the second service optical power are all larger than or equal to a power threshold, determining that no fault exists in the second optical transceiver, the first optical fiber and the second optical fiber; if the detected optical power is greater than or equal to the power threshold value, and the first service optical power and the second service optical power are both less than the power threshold value, determining that the second optical transceiver has a fault, and neither the first optical fiber nor the second optical fiber has a fault; if the detected optical power and the service optical power detected by the target optical power detector in the first optical power detector and the second optical power detector are both smaller than the power threshold, and the service optical power detected by other optical power detectors except the target optical power detector is greater than or equal to the power threshold, it is determined that the optical fiber connected to the target optical power detector has a fault, and the optical fiber connected to the other optical power detectors and the second optical transceiver device do not have a fault.

In the embodiment of the present application, the fault locator may accurately determine whether a faulty optical fiber exists in the optical fiber link based on the detected optical power, the first service optical power, and the second service optical power, and may accurately determine whether the second optical transceiver device is faulty under the condition that the optical fiber is not faulty, thereby effectively improving the accuracy of fault location.

Optionally, for the first optical transceiver device including an optical switch, the service optical signal sent by the second optical transceiver device includes an optical signal with multiple wavelengths, the service optical power detected by each of the first optical power detector and the second optical power detector is the power of the optical signal with the target wavelength in the multiple wavelengths, and the apparatus further includes a scenario of a multi-wave power detector, the fault locator may be further configured to:

if the detected optical power, the first service optical power and the second service optical power are all smaller than the power threshold, starting the multi-wave power detector; acquiring the single-wave optical power of the optical signal with each wavelength in the service optical signal sent by the second optical transceiver device, which is detected by the multi-wave power detector; if the single-wave optical power of the optical signal with any wavelength is greater than or equal to the power threshold, determining that a target optical module used for transmitting the optical signal with the target wavelength in the second optical transceiver device has a fault, determining that the optical module used for transmitting the optical signal with any wavelength has no fault, and determining that an optical fiber currently used for communicating the first optical transceiver device with the second optical transceiver device has no fault, wherein the first optical fiber and the second optical fiber comprise optical fibers with faults; if the single-wave optical power of the optical signal with each wavelength is smaller than the power threshold, controlling the optical switch to switch optical fibers for communicating the first optical transceiver and the second optical transceiver; and if the single-wave optical power of the optical signal with any wavelength after switching is greater than or equal to the power threshold, determining that an optical fiber for communicating the first optical transceiver and the second optical transceiver has a fault before switching.

The fault locator can further determine the fault condition of each optical module in the second optical transceiver based on the single-wave optical power detected by the multi-wave power detector and further locate the fault optical fiber, so that the fault locating precision is effectively improved.

In another aspect, a method for detecting a fault of an optical fiber link is provided, which can be applied to the fault detection apparatus provided in the above aspect; the optical fiber link comprises a first optical transceiver device, a second optical transceiver device and a plurality of optical fibers connected between the first optical transceiver device and the second optical transceiver device, wherein the plurality of optical fibers comprise a first optical fiber and a second optical fiber; the method can comprise the following steps:

generating a detection light signal; transmitting the detection optical signal to the first optical fiber; transmitting the detection optical signal transmitted in the first optical fiber to the second optical fiber; detecting the detected optical power of the detected optical signal transmitted in the second optical fiber; detecting a first service optical power of a service optical signal transmitted by the second optical transceiver to the first optical transceiver through the first optical fiber; detecting a second service optical power of a service optical signal transmitted by the second optical transceiver to the first optical transceiver through the second optical fiber; and determining the fault position in the optical fiber link according to the detected optical power, the first service optical power and the second service optical power.

Optionally, the process of determining the fault location in the optical fiber link according to the detected optical power, the first service optical power and the second service optical power may include:

if the detected optical power, the first service optical power and the second service optical power are all larger than or equal to a power threshold, determining that no fault exists in the second optical transceiver, the first optical fiber and the second optical fiber; if the detected optical power is greater than or equal to the power threshold value, and the first service optical power and the second service optical power are both less than the power threshold value, determining that the second optical transceiver has a fault, and neither the first optical fiber nor the second optical fiber has a fault; if the detected optical power and the target service optical power in the first service optical power and the second service optical power are both smaller than the power threshold, and the other service optical powers except the target service optical power are greater than or equal to the power threshold, determining that the target optical fiber in the first optical fiber and the second optical fiber has a fault, and the other optical fibers except the target optical fiber and the second optical transceiver device do not have faults; the power of the service optical signal transmitted by the second optical transceiver to the first optical transceiver through the target optical fiber is the target service optical power.

Optionally, the first optical transceiver device includes an optical switch; the process of determining the fault location in the optical fiber link according to the detected optical power, the first service optical power, and the second service optical power may further include:

if the detected optical power, the first service optical power and the second service optical power are all smaller than the power threshold, detecting the single-wave optical power of an optical signal with each wavelength in the service optical signals sent by the second optical transceiver; if the single-wave optical power of the optical signal with any wavelength is greater than or equal to the power threshold, determining that a target optical module used for transmitting the optical signal with the target wavelength in the second optical transceiver device has a fault, determining that the optical module used for transmitting the optical signal with any wavelength has no fault, and determining that an optical fiber currently used for communicating the first optical transceiver device with the second optical transceiver device has no fault, wherein the first optical fiber and the second optical fiber comprise optical fibers with faults; if the single-wave optical power of the optical signal with each wavelength is smaller than the power threshold, controlling the optical switch to switch optical fibers for communicating the first optical transceiver and the second optical transceiver; and if the single-wave optical power of the optical signal with any wavelength after switching is greater than or equal to the power threshold, determining that an optical fiber for communicating the first optical transceiver and the second optical transceiver has a fault before switching.

Optionally, the method may further include: and if detecting that the optical fiber which is currently used for communicating the first optical transceiver device and the second optical transceiver device in the optical fiber link has a fault, controlling an optical switch in the first optical transceiver device to switch the optical fiber which is used for communicating the first optical transceiver device and the second optical transceiver device to other optical fibers.

In yet another aspect, an optical communication system is provided, which may include: an optical fibre link, and a fault detection arrangement as provided in the above aspect; the optical fiber link comprises a first optical transceiver device, a second optical transceiver device and a plurality of optical fibers connected between the first optical transceiver device and the second optical transceiver device.

Optionally, the first optical transceiver device may be located on a BBU side and connected to the BBU; the second optical transceiver device may be located at an AAU side and connected to the AAU.

In summary, the embodiments of the present application provide an apparatus and a method for detecting a fault of an optical fiber link, and an optical communication system, where a detection optical device in the fault detection apparatus can generate a detection optical signal, and can detect detection optical power of the detection optical signal transmitted through a first optical fiber and a second optical fiber. Therefore, even if the second optical transceiver in the optical fiber link has a fault, the fault locator can accurately determine whether the fault optical fiber exists in the first optical fiber and the second optical fiber based on the detected optical power, and the precision of fault location of the optical fiber link is effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of an optical fiber link according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another optical fiber link provided in the embodiment of the present application;

fig. 3 is a schematic structural diagram of another optical fiber link provided in the embodiment of the present application;

fig. 4 is a schematic structural diagram of another optical fiber link provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a fault detection apparatus for an optical fiber link according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another fault detection apparatus for an optical fiber link according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a fault detection apparatus for an optical fiber link according to an embodiment of the present application;

FIG. 8 is a schematic diagram of an optical fiber break provided by an embodiment of the present application;

fig. 9 is a schematic diagram of wavelength allocation of a service optical signal according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a failure detection apparatus for an optical fiber link according to an embodiment of the present application;

fig. 11 is a flowchart of a method for detecting a failure of an optical fiber link according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a fault locator according to an embodiment of the present application.

Detailed Description

The following describes an apparatus and a method for detecting a failure of an optical fiber link, and an optical communication system according to embodiments of the present application in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an optical fiber link according to an embodiment of the present disclosure, and as shown in fig. 1, the optical fiber link may include a first optical transceiver device 01, a second optical transceiver device 02, and a plurality of optical fibers 03 connected between the two optical transceiver devices. For example, two optical fibers 03 are shown in fig. 1. At least one of the first optical transceiver device 01 and the second optical transceiver device 02 may be an active device. For example, the first optical transceiver device 01 may be an active device, and the second optical transceiver device 02 may be a passive device. Alternatively, both optical transceiver devices may be active devices. The passive device is a passive module which does not need to be powered except for an optical module for receiving and transmitting a light signal in the optical transceiver. The active device refers to that in the optical transceiver device, in addition to the optical module for receiving the optical signal, other modules for transmitting the optical signal include a module that needs to be powered on.

As an alternative implementation manner, the first optical transceiver 01 may be an office device disposed in a computer room and is an active device. The second optical transceiver device 02 may be a remote device, which may be a passive device because the installation and operation environment of the remote device is complicated, for example, the remote device may need to be installed on a tower. Optionally, the first optical transceiver device 01 may be disposed on the BBU side, and the second optical transceiver device 02 may be disposed on the AAU (also referred to as a 5G macro station) side or the Radio Remote Unit (RRU) side. Of course, the two optical transceiver devices may also be respectively disposed at one switch side, which is not limited in this embodiment of the application.

Each optical transceiver device can convert the electrical signal sent by the device on the side where the optical transceiver device is located into an optical signal and transmit the optical signal to another optical transceiver device through an optical fiber, and another optical transceiver device can convert the optical signal received through the optical fiber into an electrical signal and transmit the electrical signal to the device on the side where the optical transceiver device is located. In this embodiment of the present application, the arrangement of the optical transceiver device on a certain device side may refer to: the optical transceiver device is physically closer to the certain device, and may be located in the same machine room, plugged into the same board card, or enclosed in the same housing, for example.

Fig. 2 is a schematic structural diagram of another optical fiber link provided in the embodiment of the present application, and the optical fiber link provided in the embodiment of the present application is introduced by taking a forwarding network in a 5G access network as an example. As shown in fig. 2, the first optical transceiver device 01 may be located in the central office 001 of the BBU, and the second optical transceiver device 02 may be disposed on the AAU side. And because the BBU can be connected to a plurality of AAUs, and each AAU side is provided with one second optical transceiver device 02, the first optical transceiver device 01 can be connected to a plurality of second optical transceiver devices 02. As can be seen from fig. 2, the first optical transceiver device 01 and each of the second optical transceiver devices 02 can be connected by an optical fiber 03, and the optical fiber 03 can be divided into a trunk cable 031 and a distribution cable 032. The first optical transceiver device 01 may be connected to an optical cable cross-connecting box (also referred to as an optical cross-connecting box) 002 through a main cable 031, and the optical cross-connecting box 002 is connected to the second optical transceiver device 02 through a distribution cable 032. An Optical Distribution Frame (ODF) 003 is further disposed in the central office 001, and the main cable 031 is connected to the first optical transceiver 01 through the ODF 003. It should be noted that the first optical transceiver device 01 and each second optical transceiver device 02, and the optical fibers therebetween, may form one optical fiber link, that is, a plurality of optical fiber links are shown in fig. 2.

In this embodiment of the present application, a WDM technology is used between the first optical transceiver device 01 and the second optical transceiver device 02 to implement signal interaction, that is, service optical signals sent by the first optical transceiver device 01 and the second optical transceiver device 02 may all be optical signals obtained by combining N optical signals with different wavelengths. Where N is an integer greater than 1, for example N may be a positive integer multiple of 3. Alternatively, the bandwidth of the optical signal with each wavelength may be 25Gbps (gigabit per second), and the bandwidth of the service optical signal obtained by multiplexing the optical signals with different wavelengths may be N × 25 Gbps. The WDM technology may include sparse wavelength division multiplexing (CWDM), Dense Wavelength Division Multiplexing (DWDM), local area network wavelength division multiplexing (LAN WDM, LWDM), and the like.

Accordingly, referring to fig. 2 and 3, the first optical transceiver device 01 may include a plurality of optical modules 011 and a wavelength division multiplexer 012. The second optical transceiver device 02 may include a plurality of optical modules 021 and a wavelength division multiplexer 022. The wavelength division multiplexer may also be referred to as a multiplexer/demultiplexer or an add/drop multiplexer, and may be a passive device. As can be seen from fig. 2 and 3, the plurality of optical modules 021 are all disposed on an iron tower.

For each optical module in the first and second

optical transceiver devices

01 and 02, when transmitting a signal, the optical module may convert an electrical signal into an optical signal of a single wavelength and transmit the optical signal to a wavelength division multiplexer. Upon receiving the signal, the optical module may convert the optical signal of a single wavelength into an electrical signal. For each wavelength division multiplexer in the first optical transceiver 01 and the second optical transceiver 02, when sending a signal, the wavelength division multiplexer may multiplex optical signals with different wavelengths sent by a plurality of optical modules to obtain a service optical signal, and transmit the service optical signal to the optical fiber 03. When receiving signals, the wavelength division multiplexer may perform wavelength division on the service optical signals transmitted by the optical fiber 03 to obtain a plurality of optical signals with different wavelengths, and transmit the optical signals with different wavelengths to corresponding optical modules respectively.

Fig. 4 is a schematic structural diagram of another optical fiber link provided in an embodiment of the present application, and referring to fig. 1, fig. 3, and fig. 4, it can be seen that, in order to improve reliability of the optical fiber link, a plurality of optical fibers 03 may be disposed between the first optical transceiver device 01 and the second optical transceiver device 02 in the optical fiber link, for example, two optical fibers 03 are disposed in each of the optical fiber links shown in fig. 3 and fig. 4. One optical fiber of the optical fibers 03 may be a main optical fiber, and the other optical fibers may be spare optical fibers, wherein each optical fiber 03 may include a trunk cable 031 and a distribution cable 032.

As can also be seen from fig. 3, an optical switch 013 may be provided in the first optical transceiver device 01, and an optical splitter 023 may be provided in the second optical transceiver device 02. If the number of optical fibers included in the optical fiber link is M, where M is a positive integer greater than 1, the optical switch 013 can be a 1 × M optical switch, and the optical splitter 023 can be a 1 × M optical splitter. The 1 × M optical switch 013 is connected to the wavelength division multiplexer 012 and one end of the M optical fibers 03, respectively, and can switch the optical fiber currently used for communicating the first optical transceiver 01 and the second optical transceiver 02 to one of the M optical fibers 03. The 1 × M optical splitter 023 may be connected to the wavelength division multiplexer 022 and the other end of the M optical fibers 03, respectively, and the 1 × M optical splitter 023 may split the service optical signal sent by the wavelength division multiplexer 022 into M optical signals and transmit the optical signals to the M optical fibers, respectively. The 1 × M optical splitter 023 may further transmit the service optical signal transmitted by the first optical transceiver device 01 through any one of the M optical fibers to the wavelength division multiplexer 022.

Fig. 5 is a schematic structural diagram of a failure detection apparatus for an optical fiber link according to an embodiment of the present disclosure, where the failure detection apparatus is used to perform failure detection on the optical fiber link, for example, the failure detection apparatus may perform failure detection on the optical fiber link shown in any one of fig. 1 to fig. 4. As shown in fig. 5, the optical fiber link may include a first optical transceiver device 01, a second optical transceiver device 02, and a plurality of optical fibers connected between the two devices, the plurality of optical fibers including a first optical fiber 03a and a second optical fiber 03 b. Wherein at least one of the first optical transceiver device 01 and the second optical transceiver device 02 may be an active device. The first optical transceiver device 01 is an active device, and the second optical transceiver device 02 is a passive device.

Referring to fig. 5, the fault detection apparatus may include: a sensing optics 10, a first sensing light delivery assembly 20, a second sensing light delivery assembly 30, a first optical power detector PD1, a second optical power detector PD2, and a fault locator 40.

The inspection light device 10 is used to generate an inspection light signal and transmit the inspection light signal to the first inspection light transmission assembly 20.

The first sensing light transmission assembly 20 is configured to transmit the sensing light signal received from the sensing light device 10 to the first optical fiber 03 a. The second optical transmission element 30 is configured to transmit the detection optical signal transmitted in the first optical fiber 03a to the second optical fiber 03 b.

The first inspection light transmission component 20 is further configured to transmit the inspection light signal transmitted in the second optical fiber 03b to the inspection light device 10. The sensing optics 10 are also used to detect the sensing optical power of the sensing optical signal received from the first sensing optical transmission component 20.

That is, the first and second sensing

optical transmission components

20 and 30 may form a loop back path between a port of the sensing optical device 10 for transmitting a sensing optical signal and a port for receiving a sensing optical signal, and the sensing optical device 10 may transmit the sensing optical signal to the loop back path and receive the sensing optical signal transmitted through the loop back path, together with the first and second

optical fibers

03a and 03 b.

The first optical power detector PD1 is connected to the first optical fiber 03a, and is configured to detect a first service optical power of a service optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 through the first optical fiber 03 a; the second optical power detector PD2 is connected to the second optical fiber 03b, and is configured to detect a second service optical power of the service optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 through the second optical fiber 03 b.

The fault locator 40 is configured to determine a location of a fault in the optical fiber link based on the detected optical power, the first service optical power, and the second service optical power.

In the embodiment of the present application, since the first and second sensing

optical transmission members

20 and 30 can transmit the sensing optical signal generated by the sensing optical device 10 to the sensing optical device 10 through the first and second

optical fibers

03a and 03b, so that the sensing optical device 10 can detect the sensing optical power of the sensing optical signal transmitted through the first and second

optical fibers

03a and 03b, the fault locator 40 can determine whether a faulty optical fiber exists in the first and second

optical fibers

03a and 03b based on the sensing optical power. Since the first optical power detector PD1 can detect the first service optical power and the second optical power detector PD2 can detect the second service optical power, the fault locator 40 can determine whether the second optical transceiver device 02 has a fault by combining the first service optical power, the second service optical power and the detected optical power.

Optionally, a power threshold is stored in the fault locator 40 in advance, and when detecting that the power of the optical signal is greater than or equal to the power threshold, the fault locator 40 may determine that the optical signal is received normally, that is, there is no fault in the device for transmitting the optical signal and the optical fiber for transmitting the optical signal. Accordingly, fault locator 40 may determine that the optical signal was not received properly, i.e., that there is a fault with at least one device in the apparatus used to transmit the optical signal and the optical fiber used to transmit the optical signal, upon detecting that the power of the optical signal is less than the power threshold.

For example, if the fault locator 40 detects that the detected optical power, the first service optical power, and the second service optical power are all greater than or equal to the power threshold, it may be determined that no fault exists in the second optical transceiver device 02, the first optical fiber 03a, and the second optical fiber 03 b.

If the fault locator 40 detects that the detected optical power is greater than or equal to the power threshold, and both the first service optical power and the second service optical power are less than the power threshold, it may be determined that the second optical transceiver device 02 has a fault, and neither the first optical fiber 03a nor the second optical fiber 03b has a fault.

If the fault locator 40 detects the detected optical power, and the service optical powers detected by the target optical power detectors in the first optical power detector PD1 and the second optical power detector PD2 are both smaller than the power threshold, and the service optical powers detected by other optical power detectors except the target optical power detector are greater than or equal to the power threshold, it may be determined that there is a fault (e.g., a fiber break) in the optical fiber connected to the target optical power detector, and there is no fault in the optical fibers connected to the other optical power detectors and the second optical transceiver device 02.

In summary, the embodiments of the present application provide a fault detection apparatus for an optical fiber link, where a detection optical device in the fault detection apparatus can generate a detection optical signal and can detect detection optical power of the detection optical signal transmitted through a first optical fiber and a second optical fiber. Therefore, even if the second optical transceiver in the optical fiber link has a fault, the fault locator can accurately determine whether the fault optical fiber exists in the first optical fiber and the second optical fiber based on the detected optical power, and the precision of fault location of the optical fiber link is effectively improved.

In the embodiment of the present application, the light detecting device 10 may be an optical module capable of generating a light detecting signal and detecting optical power. Alternatively, the inspection optical device 10 may also include an inspection light generating module for generating an inspection light signal and a power detecting module for receiving and detecting the inspection light power of the inspection light signal. Still alternatively, the detecting optical device 10 may also be an optical time-domain reflectometer (OTDR), and the OTDR may also provide a function of monitoring the quality of the optical fiber.

Optionally, the power detection module, the first optical power detector PD1, and the second optical power detector PD2 may be Photo Detectors (PDs).

Fig. 6 is a schematic structural diagram of another optical fiber link failure detection apparatus provided in this embodiment, and as shown in fig. 6, the first detection optical transmission component 20 may include: a first detection light multiplexer F21 and a first detection light filter F22.

The first detection optical multiplexer F21 is connected to the detection optical device 10 and the first optical fiber 03a, respectively, and is configured to multiplex the detection optical signal received from the detection optical device 10 and the service optical signal received from the first optical transceiver 01, and transmit the multiplexed optical signal to the first optical fiber 03 a.

The first detection optical filter F22 is connected to the detection optical device 10 and the second optical fiber 03b, and is configured to perform wavelength division on the combined optical signal transmitted through the second optical fiber 03b to obtain a detection optical signal, and transmit the detection optical signal to the detection optical device 10.

The combined optical signal transmitted in the second optical fiber 03b may be a signal obtained by combining the detection optical signal and the service optical signal received from the second optical transceiver device 01 by the second detection optical transmission component 30.

With continued reference to fig. 6, the second detection light transmission component 30 may include: a second detection optical filter F31 and a second detection optical multiplexer F32.

The second detection optical filter F31 is connected to the first optical fiber 03a and the second detection optical multiplexer F32, and is configured to split the combined optical signal transmitted through the first optical fiber 03a to obtain a detection optical signal, and transmit the detection optical signal to the second detection optical multiplexer F32.

The second detection optical multiplexer F32 is connected to the second optical fiber 03b, and is configured to multiplex the traffic optical signal received from the second optical transceiver device 02 and the detection optical signal received from the second detection optical filter F31, and transmit the multiplexed optical signal to the second optical fiber 03 b.

As shown in fig. 6, the first detection optical filter F22 may be further connected to the first optical transceiver 01, the first detection optical filter F22 may further obtain a service optical signal from the second optical transceiver 02 by demultiplexing the combined optical signal transmitted through the second optical fiber 03b, and the first detection optical filter F22 may further transmit the service optical signal to the first optical transceiver 01.

The second optical fiber F31 may also be connected to the second optical transceiver 02, the second optical fiber F32 may further obtain a service optical signal from the first optical transceiver 01 by demultiplexing the combined optical signal transmitted through the first optical fiber 03a, and the second optical fiber F32 may further transmit the service optical signal to the second optical transceiver 02.

Based on the above analysis, the first detection light transmission assembly 20 and the second detection light transmission assembly 30 can not only realize the transmission of the detection light signals in each optical fiber, but also ensure the normal transmission of the service light signals, i.e. can avoid the influence of the fault detection process on the normal operation of the service.

As shown in fig. 6, one of the first detection light transmission assembly 20 and the second detection light transmission assembly 30 may be disposed at one end of the two optical fibers close to the first optical transceiver device 01, and the other transmission assembly may be disposed at one end of the two optical fibers close to the second optical transceiver device 02. This ensures that the first optical fiber 03a and the second optical fiber 03b can be covered with a transmission path for detecting optical signals, thereby improving the reliability of detecting optical fiber failure.

In the present embodiment, the sensing optics 10, the optical power detector, and the fault locator 40 may all be active devices, and the first sensing light transmission assembly 20 and the second sensing light transmission assembly 30 may all be passive devices. Since the first optical transceiver device 01 is an active device, as shown in fig. 5 and 6, the detection optical device 10, the optical power detector, the fault locator 40, and the first detection optical transmission component 20 may be disposed on the first optical transceiver device 01 side. The second detection light transmission member 30 may be disposed at the second light transmission/reception device 02 side.

Alternatively, the sensing optics 10, the respective optical power detectors, the fault locator 40 and the first sensing optical transmission assembly 20 may be disposed within the first optical transceiver device 01. The second detection light transmission member 30 may be provided in the second optical transceiver device 02.

Optionally, as shown in fig. 7, the plurality of optical fibers in the optical fiber link may further include: an even number of third optical fibers 03c, for example, two third optical fibers 03c are shown in fig. 7. Accordingly, the second detection light transmitting assembly 30 may include: a first sub-transport component 301, one or more second sub-transport components 302, and a third sub-transport component 303.

The first sub-transmission component 301 may be connected to the first optical fiber 03a and a third optical fiber 03c, respectively, for transmitting the detection optical signal transmitted in the first optical fiber 03a to the third optical fiber 03 c.

Each second sub-transmission assembly 302 is connected to two third optical fibers 03c, and is configured to transmit the detection optical signal transmitted in one third optical fiber 03c to another third optical fiber 03 c.

The third sub-transmission element 303 is respectively connected to the second optical fiber 03b and a third optical fiber 03c, and is configured to transmit the detection optical signal transmitted in the third optical fiber 03c to the second optical fiber 03b, wherein the third sub-transmission element 303 and the first sub-transmission element 301 are connected to different third optical fibers 03 c.

In the embodiment of the present application, in order to ensure that every two adjacent third optical fibers 03c are connected to one third sub-transmission assembly 303, the number of the second sub-transmission assemblies 302 included in the fault detection apparatus may be one less than the number of the third optical fibers 03c included in the optical fiber link, that is, the number of the second sub-transmission assemblies 302 is an odd number.

For example, referring to fig. 7, if the optical fiber link includes two third optical fibers 03c, the second detection optical transmission component 30 may include a second sub-transmission component 302. Alternatively, if the optical fiber link includes four third optical fibers 03c, the second optical transmission subassembly 30 may include three second sub-transmission subassemblies 302.

The first sub-transmission component 301, the one or more second sub-transmission components 302, and the third sub-transmission component 303 may sequentially connect the first optical fiber 03a, the even number of third optical fibers 03c, and the second optical fiber 03b in series, so that a transmission path for detecting an optical signal may traverse a plurality of optical fibers included in the optical fiber link, thereby implementing accurate detection of a fault condition of the plurality of optical fibers.

In the embodiment of the present application, since the inspection device 10 is an active device and needs to be disposed on the first optical transceiver 01 side, the first inspection light transmission assembly 20 connected to the inspection device 10 needs to be disposed on the first optical transceiver 01 side. Accordingly, referring to fig. 7, the first sub transmission component 301 and the third sub transmission component 303 are both required to be disposed on the second optical transceiver device 01 side. If only one second sub-transmission element 302 is included in the second detection light transmission element 30, as shown in fig. 7, the second sub-transmission element 302 may be disposed on the first optical transceiver device 01 side. If the second detection light transmission assembly 30 includes a plurality of second sub-transmission assemblies 302, the plurality of second sub-transmission assemblies 302 may be arranged in a staggered manner on the first optical transceiver device 01 side and the second optical transceiver device 03 side. This ensures that the transmission path for detecting optical signals can cover each optical fiber, thereby improving the reliability of optical fiber failure detection.

Alternatively, as shown in fig. 7, the first sub-transmission component 301 may include: a third detection optical filter F41 and a third detection optical multiplexer F42. The third optical filter F41 is connected to the first optical fiber 03a and the third optical multiplexer F42, and configured to split the combined optical signal transmitted through the first optical fiber 03a to obtain an optical signal for detection and a service optical signal, transmit the optical signal for detection to the third optical multiplexer F42, and transmit the service optical signal to the second optical transceiver device 02. The third optical multiplexer F42 is connected to a third optical fiber 03c, and is configured to multiplex the traffic optical signal received from the second optical transceiver device 02 and the detection optical signal received from the third optical filter F41, and transmit the multiplexed optical signal to the third optical fiber 03 c.

Each second sub-transport component 302 may include: a fourth detection optical filter F51 and a fourth detection optical multiplexer F52. The fourth optical filter F51 is connected to a third optical fiber 03c and the fourth optical multiplexer F52, and is configured to split the combined optical signal transmitted through the third optical fiber 03c to obtain an optical signal for detection and a service optical signal, transmit the optical signal for detection to the fourth optical multiplexer F52, and transmit the service optical signal to an optical transceiver (e.g., the first optical transceiver 01 shown in fig. 7). The fourth optical combiner F52 is connected to the other third optical fiber 03c, and is configured to combine the traffic optical signal received from the optical transceiver device and the detected optical signal received from the fourth optical filter F51, and transmit the combined optical signal to the other third optical fiber 03 c.

The third sub-transmission component 303 may include: a fifth detection optical filter F61 and a fifth detection optical multiplexer F62. The fifth detection optical filter F61 is connected to a third optical fiber 03c and the fifth detection optical multiplexer F62, and configured to split the combined optical signal transmitted through the third optical fiber 03c to obtain a detection optical signal and a service optical signal, transmit the detection optical signal to the fifth detection optical multiplexer F62, and transmit the service optical signal to the second optical transceiver device 02. The fifth detection optical multiplexer F62 is connected to the second optical fiber 03b, and is configured to multiplex the traffic optical signal received from the second optical transceiver device 02 and the detection optical signal received from the fifth detection optical filter F61, and transmit the multiplexed optical signal to the second optical fiber 03 b.

With continued reference to fig. 7, the fault detection apparatus may further include: an even number of third optical power detectors PD3, and the fault detection apparatus may comprise the same number of third optical power detectors PD3 as the number of third optical fibers 03c comprised in the optical fiber link.

Each third optical power detector PD3 is connected to a third optical fiber 03c, and is configured to detect a third traffic optical power of the traffic optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 through the third optical fiber 03 c.

Accordingly, the fault locator 40 may be configured to determine a location of the fault in the optical fiber link based on the detected optical power, the first traffic optical power, the second traffic optical power, and the third traffic optical power.

For example, if the detected optical power and the third service optical power detected by the target third optical power detector PD3 are all smaller than the power threshold, and the first service optical power, the second service optical power and the other third service optical powers are all greater than or equal to the power threshold, the fault locator 40 may determine that the third optical fiber 03c connected to the target third optical power detector PD3 has a fault.

Optionally, as shown in fig. 6, the fault detection apparatus may further include: a first splitter T1 and a second splitter T2.

The first optical splitter T1 is connected to the first optical fiber 03a and the first optical power detector PD1, and configured to split the service optical signal transmitted by the second optical transceiver device 02 through the first optical fiber 03a to obtain a first split optical signal and a second split optical signal, transmit the first split optical signal to the first optical power detector PD1, and transmit the second split optical signal to the first optical transceiver device 01.

The second optical splitter T2 is connected to the second optical fiber 03b and the second optical power detector PD2, and is configured to split the service optical signal transmitted by the second optical fiber 03b through the second optical fiber 02 to obtain a third optical signal and a fourth optical signal, transmit the third optical signal to the second optical power detector PD2, and transmit the fourth optical signal to the first optical transceiver 01.

The power of the second optical splitting signal may be greater than the power of the first optical splitting signal, and the power of the fourth optical splitting signal may be greater than the power of the third optical splitting signal. That is, each of the splitters may transmit only a small amount of service optical signals to the optical power detector for optical power detection, so as to avoid affecting the normal operation of the service.

In the embodiment of the present application, if an even number of third optical fibers 03c are further included in the optical fiber link, referring to fig. 7, the fault detection apparatus may further include an even number of third optical splitters T3. Each third optical splitter T3 is connected to a third optical fiber 03c and a third optical power detector PD3, and is configured to split the service optical signal transmitted by the second optical transceiver device 02 through the third optical fiber 03c to obtain a fifth optical signal and a sixth optical signal, transmit the fifth optical signal to the third optical power detector PD3, and transmit the sixth optical signal to the first optical transceiver device 01. Similarly, the power of the sixth optical signal may be greater than the power of the fifth optical signal.

In this embodiment, in order to reduce a delay error between the transmission of the service optical signal (i.e., uplink transmission) from the second optical transceiver device 02 to the first optical transceiver device 01 and the transmission of the service optical signal (i.e., downlink transmission) from the first optical transceiver device 01 to the second optical transceiver device 02, each optical fiber 03 in the optical fiber link may transmit an optical signal by using a single-fiber bidirectional transmission technology, that is, an uplink service optical signal and a downlink service optical signal are transmitted in one optical fiber 03. Therefore, after a certain optical fiber 03 is broken, although the broken optical fiber 03 cannot transmit the uplink service optical signal sent by the second optical transceiver device 02 to the optical power detector PD, the downlink service optical signal sent by the first optical transceiver device 01 is reflected at the broken optical fiber, and the reflected optical signal interferes with the power detection of the optical power detector, so that whether the optical fiber is broken cannot be accurately determined based on the power detection result of the optical power detector.

For example, referring to fig. 8, if the first optical fiber 03a is broken, the service optical signal transmitted by the first optical transceiver 01 may be reflected at the broken fiber, and the reflected optical signal may be transmitted to the first optical power detector PD1 through the first splitter T1, so as to interfere with the power detection result of the first optical power detector PD 1.

The upstream traffic optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 may include optical signals of one or more wavelengths in the optical fiber link. The downlink traffic optical signal sent by the first optical transceiver device 01 to the second optical transceiver device 02 may also include optical signals with one or more wavelengths. The wavelength of the upstream traffic optical signal is different from that of the downstream traffic optical signal.

For example, referring to fig. 9, in an optical fiber link adopting the CWDM technology, one of the uplink service optical signal and the downlink service optical signal may include optical signals of three wavelengths λ 1, λ 3, and λ 5, and the other service optical signal may include optical signals of three wavelengths λ 2, λ 4, and λ 6. In this case, λ 1 ═ 1271nm (nm), λ 2 ═ 1291nm, λ 3 ═ 1311nm, λ 4 ═ 1331nm, λ 5 ═ 1351nm, and λ 6 ═ 1371 nm.

In this embodiment of the application, since the wavelengths of the uplink service optical signal and the downlink service optical signal are different, in order to avoid interference of the optical signal reflected at the broken fiber, as shown in fig. 6 and 7, the fault detection apparatus may further include: a first service optical filter F71 and a second service optical filter F72.

The first service optical filter F71 is connected to the first splitter T1 and the first optical power detector PD1, respectively, and is configured to filter the first split optical signal received from the first splitter T1 to obtain a first sub-split optical signal with a target wavelength, and transmit the first sub-split optical signal to the first optical power detector PD 1.

The second service optical filter F72 is connected to the second splitter T2 and the second optical power detector PD2, and is configured to filter the third optical splitting signal received from the second splitter T2 to obtain a second sub optical splitting signal with a target wavelength, and transmit the second sub optical splitting signal with the target wavelength to the second optical power detector PD 2.

The service optical signal sent by the second optical transceiver device 02 to the first optical transceiver device 01 includes an optical signal with one or more wavelengths, and the target wavelength is at least one of the one or more wavelengths. Because the wavelengths of the uplink service optical signal and the downlink service optical signal are different, the service filter is used for filtering the sub-split optical signal with the target wavelength in the uplink service optical signal, so that only the sub-split optical signal with the target wavelength can be transmitted to the optical power detector when the optical fiber is broken, the downlink service optical signal is prevented from being reflected to the optical power detector, and the accuracy of the detection result of the optical power detector can be ensured.

Optionally, the first service optical filter F71 and the second service optical filter F72 may both be single wave filters, and both of the single wave filters may filter out sub-split optical signals with a single wavelength. The target wavelength is one of the one or more wavelengths. In the embodiment of the present application, if the service optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 includes optical signals with multiple wavelengths, the target wavelength may be any one of the multiple wavelengths, or may also be a wavelength with a highest frequency of use among the multiple wavelengths.

For example, assuming that the traffic optical signal sent by the second optical transceiver device 02 to the first optical transceiver device 01 includes optical signals with three wavelengths, i.e., λ 1 ═ 1271nm, λ 3 ═ 1311nm, and λ 5 ═ 1351nm, the target wavelength may be λ 1 ═ 1271 nm.

Alternatively, if the service optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 includes optical signals with multiple wavelengths, the first service optical filter F71 and the second service optical filter F72 may also be comb filters or etalon (etalon) devices. Accordingly, the target wavelength may be some or all of the plurality of wavelengths.

Or, if the upstream service optical signal and the downstream service optical signal transmitted by the second optical transceiver device 02 to the first optical transceiver device 01 both include optical signals with multiple wavelengths, and the wavelength used by the upstream service optical signal belongs to the blue band range (1528 to 1543nm), and the wavelength used by the downstream service optical signal belongs to the red band range (1547 to 1563nm), the first service optical filter F71 and the second service optical filter F72 may also be red and blue band filters. The red and blue band filter can filter out optical signals with wavelengths in the blue band range. Or, if the wavelength used by the uplink service optical signal belongs to the red band range and the wavelength used by the downlink service optical signal belongs to the blue band range, the red and blue band filter may filter out the optical signal whose wavelength is in the red band range. Accordingly, the target wavelength may be all of the plurality of wavelengths.

It should be noted that, if the optical fiber link further includes an even number of third optical fibers 03c, referring to fig. 7, the fault detection apparatus may further include an even number of third service filters F73. Each third service filter F73 may be connected to a third splitter T3 and a third optical power detector PD3, respectively, and configured to filter the fifth optical signal received from the third splitter T3 to obtain a third sub optical signal with a target wavelength, and transmit the third sub optical signal with the target wavelength to the third optical power detector PD 3.

In this embodiment, as shown in fig. 10, the optical fiber link further includes an optical switch 013, and for a scenario where the service optical signal transmitted by the second optical transceiver device 02 includes optical signals with multiple wavelengths, the fault detection apparatus may further include: a multi-wave power detector 50. The multiwave power detector 50 is connected to the optical switch 013 and the fault locator 40 respectively, and the multiwave power detector 50 can be used to detect the single-wave optical power of each wavelength of the optical signals in the traffic optical signals transmitted by the second optical transceiver device 02.

Accordingly, the fault locator 40 may be configured to determine a location of the fault in the optical fiber link based on the detected optical power, the first service optical power, the second service optical power, and the single-wave optical power.

For example, if the fault locator 40 detects that the single-wave optical power of the optical signal with the first wavelength is smaller than the power threshold, and the single-wave optical power of the optical signal with the second wavelength is greater than or equal to the power threshold, the fault locator 40 may determine that there is a fault in the optical module for transmitting the optical signal with the first wavelength in the second optical transceiver device 02, and there is no fault in the optical module for transmitting the optical signal with the second wavelength.

The fault locator 40 can determine whether each optical module in the second optical transceiver device 02 has a fault based on the single-wave optical power, thereby further improving the precision of fault location.

In the embodiment of the present application, as shown in fig. 10, the multi-wave power detector 50 may be connected between the optical switch 013 and the wavelength division multiplexer 012. Alternatively, the multiple wave power detector 50 may be integrated into the wavelength division multiplexer 012, which is not limited in the embodiment of the present application.

Optionally, the fault locator 40 may be further connected to the optical switch 013, and the fault locator 40 may be further configured to control the optical switch 013 to switch the optical fiber for connecting the first optical transceiver device 01 and the second optical transceiver device 02 to another optical fiber when detecting that there is a fault in the optical fiber currently used for connecting the first optical transceiver device 01 and the second optical transceiver device 02. Therefore, normal transmission of service optical signals can be ensured, and the reliability of the optical fiber link is improved.

For example, referring to fig. 6, assuming that the optical fiber currently used to communicate the first optical transceiver device 01 and the second optical transceiver device 02 is the first optical fiber 03a, if the fault locator 40 determines that there is a fault in the first optical fiber 03a based on the detected optical power, the first service optical power and the second service optical power, the optical switch 013 may be controlled to switch the optical fiber currently used to communicate the first optical transceiver device 01 and the second optical transceiver device 02 to the second optical fiber 03 b.

If the optical fiber for communicating the first optical transceiver device 01 and the second optical transceiver device 02 is the first optical fiber 03a, the transmission path of the downlink service optical signal transmitted by the first optical transceiver device 01 is: the optical module 011 → the wavelength division multiplexer 012 → the optical switch 013 → the first splitter T1 → the first detection light combiner F21 → the first optical fiber 03a → the second detection light filter F31 → the optical splitter 023 → the wavelength division multiplexer 022 → the optical module 021.

The transmission path of the upstream service optical signal sent by the second optical transceiver device 02 is: the optical module 021 → the wavelength division multiplexer 022 → the optical splitter 023 → the second detection optical filter F31 → the first optical fiber 03a → the first detection optical multiplexer F21 → the first splitter T1 → the optical switch 013 → the wavelength division multiplexer 022 → the optical module 021.

In addition, after the uplink service optical signal sent by the second optical transceiver device 02 is split by the optical splitter 023, another service optical signal is transmitted to the second detection optical combiner F32, and the transmission path of the service optical signal is: the beam splitter 023 → the second detection light multiplexer F32 → the second optical fiber 03b → the first detection light filter F22 → the second wave splitter T2 → the optical switch 013. Since the optical switch 013 is in communication with the first optical fiber 03a, the traffic optical signal is terminated. If the service optical signal transmitted by the path termination is reflected to the optical splitter 023, since the directivities of two optical ports of the optical splitter 023 are generally greater than 55dB, the reflected service optical signal can be isolated, and the reflected service optical signal is prevented from being transmitted to the first optical fiber 03 a.

If the optical fiber for communicating the first optical transceiver device 01 and the second optical transceiver device 02 is the second optical fiber 03b, the transmission path of the downlink service optical signal sent by the first optical transceiver device 01 is: the optical module 011 → the wavelength division multiplexer 012 → the optical switch 013 → the second wave splitter T2 → the first detection light filter F22 → the second optical fiber 03b → the second detection light multiplexer F32 → the light splitter 023 → the wavelength division multiplexer 022 → the optical module 021.

The transmission path of the upstream service optical signal sent by the second optical transceiver device 02 is: the optical module 021 → the wavelength division multiplexer 022 → the beam splitter 023 → the second detection light filter F31 → the second optical fiber 03b → the first detection light filter F22 → the second splitter T2 → the optical switch 013 → the wavelength division multiplexer 012 → the optical module 011.

In addition, after the upstream traffic optical signal sent by the second optical transceiver device 02 is split by the optical splitter 023, another traffic optical signal is transmitted to the second detection optical filter F31, and the transmission path of the traffic optical signal is: the beam splitter 023 → the second detection optical filter F31 → the first optical fiber 03a → the first detection optical combiner F21 → the first splitter T1 → the optical switch 013. Since the optical switch 013 is in communication with the second optical fiber 03b, the traffic optical signal is terminated.

It should be noted that, no matter the optical fiber currently used for communicating the first optical transceiver 01 and the second optical transceiver 02 is a first optical fiber or a second optical fiber, the transmission path of the upstream traffic optical signal transmitted by the second optical transceiver 02 further includes the following two types:

(1) the optical module 021 → the wavelength division multiplexer 022 → the optical splitter 023 → the second detection optical filter F31 → the first optical fiber 03a → the first detection optical multiplexer F21 → the first splitter T1 → the first traffic optical filter F71 → the first optical power detector PD 1.

(2) The optical module 021 → the wavelength division multiplexer 022 → the optical splitter 023 → the second detection optical multiplexer F32 → the second optical fiber 03b → the first detection optical filter F22 → the second optical splitter T2 → the second traffic optical filter F72 → the second optical power detector PD 2.

The transmission path of the inspection light signal transmitted by the inspection light device 10 may be: the detection light device 10 → the first detection light combiner F21 → the first optical fiber 03a → the second detection light filter F31 → the second detection light combiner F32 → the second optical fiber 03b → the first detection light filter F22 → the detection light device 10.

Optionally, in this embodiment of the present application, the fault locator 40 may be configured to:

if the detected optical power, the first service optical power, and the second service optical power are all greater than or equal to a power threshold, it is determined that no fault exists in the second optical transceiver device 02, the first optical fiber 03a, and the second optical fiber 03 b.

If the detected optical power is greater than or equal to the power threshold, and both the first service optical power and the second service optical power are less than the power threshold, it is determined that the second optical transceiver device 02 has a fault, and neither the first optical fiber 03a nor the second optical fiber 03b has a fault.

If the detected optical power and the service optical power detected by the target optical power detector in the first optical power detector PD1 and the second optical power detector PD2 are both smaller than the power threshold, and the service optical power detected by the other optical power detectors except the target optical power detector is greater than or equal to the power threshold, it is determined that there is a failure in the optical fiber connected to the target optical power detector, and there is no failure in the optical fiber connected to the other optical power detectors and in the second optical transceiver device 02.

Optionally, for the solution that the fault detection apparatus further comprises a multi-wave power detector 50, the fault locator 40 may be further configured to:

if it is determined that the second optical transceiver device 02 has a fault, or if the detected optical power, the first service optical power and the second service optical power are all smaller than the power threshold, the multi-wave power detector 50 is started;

acquiring the single-wave optical power of the optical signal of each wavelength in the service optical signal sent by the second optical transceiver device 02, which is detected by the multi-wave power detector 50;

if the single-wave optical power of the optical signal with any wavelength is greater than or equal to the power threshold, determining that a target optical module, which is used for transmitting the optical signal with the target wavelength, in the second optical transceiver device 02 has a fault, the optical module, which is used for transmitting the optical signal with any wavelength, does not have a fault, an optical fiber, which is currently used for communicating the first optical transceiver device 01 and the second optical transceiver device 02, does not have a fault, and the first optical fiber 03a and the second optical fiber 03b include optical fibers with faults;

if the single-wave optical power of the optical signal with each wavelength is smaller than the power threshold, controlling the optical switch 013 to switch optical fibers for communicating the first optical transceiver device 01 and the second optical transceiver device 02;

if the single-wave optical power of the optical signal with any wavelength after switching is greater than or equal to the power threshold, it is determined that an optical fiber for communicating the first optical transceiver device 01 and the second optical transceiver device 02 before switching has a fault.

The embodiment of the present application further provides a method for detecting a fault of an optical fiber link, which can be implemented by the fault detection apparatus provided in the above embodiment. As shown in fig. 11, the method may include:

step 101, generating a detection optical signal.

Referring to fig. 5 to 7, and fig. 10, the fault detection apparatus includes a sensing optical device 10 therein, and the sensing optical device 10 may generate a sensing optical signal.

Step 102, transmitting the detection optical signal to a first optical fiber.

Referring to fig. 5 to 7, and fig. 10, the fault detection apparatus further includes a first detection light transmission assembly 20, and the first detection light transmission assembly 20 can transmit the detection light signal to the first optical fiber.

Step 103, transmitting the detection optical signal transmitted in the first optical fiber to a second optical fiber.

Referring to fig. 5-7, and 10, the fault detection apparatus further includes a second detection light transmission assembly 30, and the second detection light transmission assembly 30 can transmit the detection light signal transmitted in the first optical fiber to a second optical fiber.

And 104, detecting the detection optical power of the detection optical signal transmitted in the second optical fiber.

The first sensing light transmission component 20 may also retransmit the sensing light signal transmitted in the second optical fiber to the sensing light device 10, and the sensing light device 10 may sense the sensing light power of the received sensing light signal.

Step 105, detecting a first service optical power of a service optical signal transmitted by the second optical transceiver to the first optical transceiver through the first optical fiber.

Referring to fig. 5 to 7 and 10, the fault detection apparatus further includes a first optical power detector PD1 connected to the first optical fiber, and the first optical power detector PD1 may detect a first traffic optical power of a traffic optical signal transmitted from the second optical transceiver to the first optical transceiver through the first optical fiber.

Step 106, detecting a second service optical power of the service optical signal transmitted by the second optical transceiver to the first optical transceiver through the second optical fiber.

Referring to fig. 5 to 7 and 10, the fault detection apparatus further includes a second optical power detector PD2 connected to the second optical fiber, and the second optical power detector PD2 may detect a second traffic optical power of a traffic optical signal transmitted by the second optical transceiver to the first optical transceiver through the second optical fiber.

And step 107, determining the fault position in the optical fiber link according to the detected optical power, the first service optical power and the second service optical power.

Referring to fig. 5 to 7, and fig. 10, the fault detection apparatus further includes a fault locator 40, and the fault locator 40 may obtain the detected optical power, the first service optical power, and the second service optical power, and may determine a fault location in the optical fiber link based on the obtained powers.

Optionally, the process of determining the fault location in step 107 may include:

the detected optical power P0, the first traffic optical power P1 and the second traffic optical power P2 are respectively compared with a power threshold Pth, and the location of the fault in the optical fiber link is determined based on the comparison result. Table 1 is a list of fault conditions determined based on comparison results provided in the embodiments of the present application.

Referring to table 1, it can be seen that if P0, P1 and P2 are all greater than or equal to Pth, it can be determined that none of the second optical transceiver device, the first optical fiber and the second optical fiber is faulty, i.e., can operate normally.

If P0 ≧ Pth, and both P1 and P2 are less than Pth, it can be determined that there is a failure in the second optical transceiver device, and neither the first optical fiber nor the second optical fiber has a failure.

If the target service optical power in P0 and P1 and P2 is less than the Pth and the other service optical powers except the target service optical power are greater than or equal to Pth, it is determined that the target optical fiber of the first optical fiber and the second optical fiber has a failure, and the other optical fibers except the target optical fiber and the second optical transceiver device do not have a failure. The power of the service optical signal transmitted by the second optical transceiver to the first optical transceiver through the target optical fiber is the target service optical power.

For example, as shown in Table 1, if the target traffic optical power P1 in P0, and P1 and P2 is less than Pth, and P2 ≧ Pth, it can be determined that neither the second optical fiber nor the second optical transceiver device has a failure, and the first optical fiber has a failure, i.e., the first optical fiber is the target optical fiber. If the target service optical power P2 in P0 and P1 and P2 is less than Pth and P1 is greater than or equal to Pth, it can be determined that the first optical fiber and the second optical transceiver device are not failed and the second optical fiber is failed, i.e. the second optical fiber is the target optical fiber.

TABLE 1

It should be noted that if it is detected that all of P0, P1, and P2 are less than Pth, it can be determined that the failure condition of the optical fiber link is: the first optical transceiver device is free from faults, and the first optical fiber and the second optical fiber are both faulty; alternatively, the second optical transceiver device is faulty and at least one of the first and second optical fibers is faulty.

Based on the analysis, whether a fault optical fiber exists in the optical fiber link can be accurately determined based on the P0, the P1 and the P2, and whether the second optical transceiver device fails can be accurately determined under the condition that the optical fiber does not fail, so that the accuracy of fault location is effectively improved.

In this embodiment, for a scenario that the traffic optical signal transmitted by the second optical transceiver device includes optical signals with N (N is an integer greater than 1) wavelengths, and both the P1 and the P2 are power of the optical signal with a target wavelength in the N wavelengths, as shown in fig. 10, the fault detection apparatus may further include a multi-wave power detector 50. Accordingly, the process of determining the fault location in step 107 may further include:

if it is detected that all of the P0, P1 and P2 are smaller than Pth, the single-wave optical power of the optical signal of each wavelength in the traffic optical signal transmitted by the second optical transceiver device is continuously detected. For example, the fault locator 40 may activate the multi-wave power detector 50 and detect the single-wave optical power of each wavelength of the optical signals in the traffic optical signal transmitted by the second optical transceiver device through the multi-wave power detector 50. The fault locator 40 may then compare each single wave optical power division to a power threshold and continue locating the fault location in the fiber link based on the comparison.

Table 2 is another list of fault conditions determined based on the comparison results provided in the embodiments of the present application. Referring to table 2, it can be seen that, if the single-wave optical power Pn of the optical signal with the nth wavelength in the N wavelengths is greater than or equal to Pth, it may be determined that a fault exists in the target optical module in the second optical transceiver device for transmitting the optical signal with the target wavelength, no fault exists in the nth optical module for transmitting the optical signal with the nth wavelength, no fault exists in the optical fiber currently used for communicating the first optical transceiver device and the second optical transceiver device, and the first optical fiber and the second optical fiber include optical fibers with faults. Wherein N is a positive integer not greater than N.

For example, assuming that the optical fiber link includes a first optical fiber and a second optical fiber, and the optical fiber currently used for connecting the first optical transceiver device and the second optical transceiver device is the first optical fiber, the fault locator 40 may determine that the first optical fiber is normal and the second optical fiber is faulty.

If the single-wave optical power of the optical signal of each of the N wavelengths is less than Pth, the fault locator 40 may control the optical switch to switch the optical fiber for communicating the first optical transceiver device and the second optical transceiver device. If the single-wave optical power Pn of the switched optical signal with the nth wavelength is greater than or equal to Pth, the fault locator 40 may determine that there is a fault in the optical fiber used to communicate the first optical transceiver device and the second optical transceiver device before switching. And, there is not trouble in optic fibre and this nth optical module after switching.

For example, assuming that the optical fiber link includes a first optical fiber and a second optical fiber, an optical fiber used for communicating the first optical transceiver device and the second optical transceiver device before switching is the first optical fiber, and the fault locator 40 controls the optical switch to the second optical fiber and then detects that Pn is greater than or equal to Pth, the fault locator 40 may determine that the first optical fiber and the target optical module are faulty, and the second optical fiber and the nth optical module are normal.

If the single-wave optical power of the optical signal with each wavelength is smaller than the power threshold after the optical switch is controlled to switch the optical fibers for connecting the first optical transceiver device and the second optical transceiver device to each optical fiber in the optical fiber link, as shown in table 2, it may be determined that the fault condition in the optical fiber link includes: one optical fiber of the first optical fiber and the second optical fiber is failed, and all optical modules in the second optical transceiver device are failed; or, both the first optical fiber and the second optical fiber fail, and the second optical transceiver device is normal or at least one optical module fails. At this time, in order to accurately locate the fault position, a worker needs to manually detect the fault position.

TABLE 2

Optionally, in this embodiment of the application, the fault locator 40 may also start the multi-wave power detector 50 after determining that the first optical fiber and the second optical fiber are both normal based on P0, P1, and P2, and that the second optical transceiver has a fault, and may further determine a fault condition of each optical module in the second optical transceiver based on the single-wave optical power detected by the multi-wave power detector 50.

For example, referring to table 2, if the fault locator 40 detects that the nth single-wave optical power Pn ≧ Pth, it can be determined that the target optical module in the second optical transceiver device is faulty, and the n optical module is normal. If the fault locator 40 detects that each single-wave optical power is smaller than the power threshold, it may be determined that all optical modules in the second optical transceiver device are faulty.

Based on the above analysis, the fault locator 40 can further determine the fault condition of each optical module in the second optical transceiver device and further locate the faulty optical fiber based on the single-wave optical power detected by the multi-wave power detector 50, so that the precision of fault location is effectively improved.

Optionally, as shown in fig. 11, the method may further include:

and 108, if detecting that the optical fibers which are currently used for communicating the first optical transceiver device and the second optical transceiver device have faults, controlling an optical switch to switch the optical fibers which are used for communicating the first optical transceiver device and the second optical transceiver device to other optical fibers.

In the embodiment of the present application, the optical switch may be controlled by the fault locator 40 to switch the optical fiber for connecting the first optical transceiver device and the second optical transceiver device to the optical fiber without fault, so as to ensure normal plugging of the service optical signal. For example, when the fault locator 40 detects that there is a fault in a first optical fiber currently used to communicate the first optical transceiver device with the second optical transceiver device, the optical switch may be controlled to switch the optical fiber used to communicate the first optical transceiver device with the second optical transceiver device to a second optical fiber.

Among other things, the length of time required for the fault locator 40 to determine the faulty fiber and control the optical switch to switch based on P0, P1, and P2 is short, such as may be less than 50ms (milliseconds). If the fault locator 40 needs to determine the faulty optical fiber based on the single-wave optical power detected by the multi-wave power detection 50, the time required for determining the faulty optical fiber and controlling the optical switch to switch is long, for example, may be longer than 50 ms.

The embodiment of the application provides a fault detection method for an optical fiber link, which can generate detection optical signals and detect the detection optical power of the detection optical signals transmitted by a first optical fiber and a second optical fiber. Therefore, even if the second optical transceiver in the optical fiber link has a fault, whether the fault optical fiber exists in the first optical fiber and the second optical fiber can be accurately determined based on the detected optical power, and the precision of fault positioning of the optical fiber link is effectively improved.

It should be noted that, the order of the steps of the fault detection method provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be correspondingly increased or decreased according to the situation. For example, step 105 and step 106 may be performed before step 104; alternatively, step 108 may be deleted as appropriate. Any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application is covered by the protection scope of the present application, and thus the detailed description thereof is omitted.

It should be understood that the fault locator in the fault detection apparatus provided in the embodiments of the present application may be implemented by an application-specific integrated circuit (ASIC), or a Programmable Logic Device (PLD), which may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

Fig. 12 is a schematic structural diagram of a fault locator provided in an embodiment of the present application, and referring to fig. 12, the fault locator may include: a processor 1201, memory 1202, a network interface 1203, and a bus 1204. The bus 1204 is used for connecting the processor 1201, the memory 1202, and the network interface 1203. Communication connections with other devices may be made through a network interface 1203 (which may be wired or wireless). The memory 1202 stores therein a computer program 12021, and the computer program 12021 is used to realize various application functions.

It should be understood that in the embodiment of the present application, the processor 1201 may be a CPU, and the processor 1201 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), GPUs or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or any conventional processor or the like.

The memory 1202 can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (ddr SDRAM), enhanced synchronous SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and direct bus RAM (DRRAM).

The bus 1204 may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. But for the sake of clarity the various busses are labeled in the drawings as bus 1204.

The processor 1201 is configured to execute a computer program stored in the memory 1202, and the processor 1201 realizes the methods shown in step 107 and step 108 in the above-described method embodiments by executing the computer program 12021.

An embodiment of the present application further provides an optical communication system, and with reference to fig. 5 to 7, the system may include: an optical fibre link, and a fault detection arrangement as provided in the above aspect; the optical fiber link includes a first optical transceiver device 01, a second optical transceiver device 02, and a plurality of optical fibers 03 connected between the first optical transceiver device 01 and the second optical transceiver device 02.

The first optical transceiver device 01 may be located on the BBU side and connected to the BBU. The second optical transceiver device 02 may be located at the AAU side and connected to the AAU.

Embodiments of the present application also provide a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the method as shown in

steps

107 and 108 in the above method embodiments.

The present application also provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the method shown in

steps

107 and 108 in the above method embodiments.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical fiber link failure detection device, wherein the optical fiber link includes a first optical transceiver device, a second optical transceiver device, and a plurality of optical fibers connected between the first optical transceiver device and the second optical transceiver device, each of the optical fibers is respectively connected with the first optical transceiver device and the second optical transceiver device, and the plurality of optical fibers includes a first optical fiber and a second optical fiber; the failure detection device includes: a detection optics, a first detection light transmission assembly, a second detection light transmission assembly, a first optical power detector, a second optical power detector, and a fault locator;

the detection light device is used for generating a detection light signal and transmitting the detection light signal to the first detection light transmission component;

the first detection light transmission component is used for transmitting the detection light signals received from the detection light device to the first optical fiber;

the second detection light transmission component is used for transmitting the detection light signal transmitted in the first optical fiber to the second optical fiber;

the first detection light transmission assembly is also used for transmitting detection light signals transmitted in the second optical fiber to the detection light device;

the sensing optical device is further configured to sense the sensing optical power of the sensing optical signal received from the first sensing optical transmission component;

the first optical power detector is connected to the first optical fiber and configured to detect a first service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the first optical fiber;

the second optical power detector is connected to the second optical fiber and configured to detect a second service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the second optical fiber;

and the fault locator is used for determining the fault position in the optical fiber link according to the detection optical power, the first service optical power and the second service optical power.

2. The apparatus of claim 1, wherein the first detection light transmission component comprises: a first detection optical multiplexer and a first detection optical filter;

the first detection optical multiplexer is respectively connected to the detection optical device and the first optical fiber, and is configured to multiplex a detection optical signal received from the detection optical device and a service optical signal received from the first optical transceiver device, and transmit the multiplexed optical signal to the first optical fiber;

the first detection optical filter is connected to the detection optical device and the second optical fiber, and is configured to perform wavelength division on the combined optical signal transmitted in the second optical fiber to obtain a detection optical signal, and transmit the detection optical signal to the detection optical device.

3. The apparatus of claim 2, wherein the second detection light transmission component comprises: a second detection optical multiplexer and a second detection optical filter;

the second detection optical filter is respectively connected with the first optical fiber and the second detection optical multiplexer, and is configured to perform wavelength division on the combined optical signal transmitted in the first optical fiber to obtain a detection optical signal, and transmit the detection optical signal to the second detection optical multiplexer;

the second optical combiner is connected to the second optical fiber, and is configured to combine the service optical signal received from the second optical transceiver device with the detection optical signal received from the second detection optical filter, and transmit the combined optical signal to the second optical fiber.

4. The apparatus of claim 1, wherein one of the plurality of optical fibers is a primary optical fiber and the other optical fibers are backup optical fibers; the plurality of optical fibers further includes: an even number of third optical fibers; the device further comprises: an even number of third optical power detectors; the second detection light transmission assembly includes: a first sub-transport component, one or more second sub-transport components, and a third sub-transport component;

the first sub-transmission assembly is respectively connected with the first optical fiber and one third optical fiber and is used for transmitting the detection optical signal transmitted in the first optical fiber to the third optical fiber;

each second sub-transmission assembly is respectively connected with two third optical fibers and is used for transmitting the detection optical signal transmitted in one third optical fiber to the other third optical fiber;

the third sub-transmission assembly is respectively connected with the second optical fiber and one third optical fiber and is used for transmitting the detection optical signal transmitted in the third optical fiber to the second optical fiber, wherein the third sub-transmission assembly and the first sub-transmission assembly are connected with different third optical fibers;

each third optical power detector is connected to one third optical fiber and configured to detect a third service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the third optical fiber;

the fault locator is configured to determine a fault location in the optical fiber link according to the detected optical power, the first service optical power, the second service optical power, and the third service optical power.

5. The apparatus of claim 1, further comprising: a first splitter and a second splitter;

the first optical splitter is connected to the first optical fiber and the first optical power detector, and configured to split a service optical signal transmitted by the second optical transceiver device through the first optical fiber to obtain a first split optical signal and a second split optical signal, transmit the first split optical signal to the first optical power detector, and transmit the second split optical signal to the first optical transceiver device;

the second optical splitter is connected to the second optical fiber and the second optical power detector, and configured to split a service optical signal transmitted by the second optical transceiver device through the second optical fiber to obtain a third optical split signal and a fourth optical split signal, transmit the third optical split signal to the second optical power detector, and transmit the fourth optical split signal to the first optical transceiver device;

wherein the power of the second optical splitting signal is greater than the power of the first optical splitting signal, and the power of the fourth optical splitting signal is greater than the power of the third optical splitting signal.

6. The apparatus of claim 5, wherein the traffic optical signals transmitted by the second optical transceiver device comprise optical signals at one or more wavelengths; the device further comprises: a first service optical filter and a second service optical filter;

the first service optical filter is respectively connected to the first splitter and the first optical power detector, and is configured to filter a first optical splitting signal received from the first splitter to obtain a first optical splitting signal with a target wavelength in the one or more wavelengths, and transmit the first optical splitting signal to the first optical power detector;

the second service optical filter is connected to the second splitter and the second optical power detector, and configured to filter a third optical splitting signal received from the second splitter to obtain a second sub optical splitting signal of a target wavelength in the one or more wavelengths, and transmit the second sub optical splitting signal of the target wavelength to the second optical power detector.

7. The apparatus of any of claims 1 to 6, wherein the first optical transceiver device comprises: an optical switch connected to each of the optical fibers; the service optical signal sent by the second optical transceiver device comprises optical signals with a plurality of wavelengths; the device further comprises: a multi-wave power detector;

the multi-wave power detector is respectively connected with the optical switch and the fault locator, and is configured to detect a single-wave optical power of an optical signal of each wavelength in a service optical signal received by the optical switch and sent by the second optical transceiver device;

and the fault locator is used for determining a fault position in the optical fiber link according to the detection optical power, the first service optical power, the second service optical power and the single-wave optical power.

8. The apparatus of any of claims 1 to 6, wherein the first optical transceiver device comprises: an optical switch connected to each of the optical fibers;

the fault locator is further connected with the optical switch, and the fault locator is further configured to control the optical switch to switch optical fibers used for communicating the first optical transceiver device and the second optical transceiver device to other optical fibers when detecting that the optical fibers currently used for communicating the first optical transceiver device and the second optical transceiver device have a fault.

9. The apparatus of any of claims 1 to 6, wherein the fault locator is configured to:

if the detected optical power, the first service optical power and the second service optical power are all greater than or equal to a power threshold, determining that no fault exists in the second optical transceiver, the first optical fiber and the second optical fiber;

if the detected optical power is greater than or equal to the power threshold value, and the first service optical power and the second service optical power are both less than the power threshold value, determining that the second optical transceiver has a fault, and the first optical fiber and the second optical fiber do not have a fault;

if the detected optical power and the service optical power detected by the target optical power detector in the first optical power detector and the second optical power detector are both smaller than the power threshold, and the service optical power detected by other optical power detectors except the target optical power detector is greater than or equal to the power threshold, it is determined that the optical fiber connected to the target optical power detector has a fault, and the optical fiber connected to the other optical power detectors and the second optical transceiver device do not have a fault.

10. The apparatus of claim 9, wherein the first optical transceiver device comprises: an optical switch; the service optical signal transmitted by the second optical transceiver device includes optical signals of multiple wavelengths, and the service optical power detected by each of the first optical power detector and the second optical power detector is the power of an optical signal of a target wavelength in the multiple wavelengths; the device further comprises: a multi-wave power detector connected to the optical switch and the fault locator, respectively; the fault locator is further configured to:

if the detected optical power, the first service optical power and the second service optical power are all smaller than the power threshold, starting the multi-wave power detector;

acquiring the single-wave optical power of an optical signal of each wavelength in the service optical signal sent by the second optical transceiver device, which is detected by the multi-wave power detector;

if the single-wave optical power of the optical signal with any wavelength is greater than or equal to the power threshold, determining that a target optical module used for transmitting the optical signal with the target wavelength in the second optical transceiver device has a fault, determining that an optical module used for transmitting the optical signal with any wavelength has no fault, and determining that an optical fiber currently used for communicating the first optical transceiver device with the second optical transceiver device has no fault, wherein the first optical fiber and the second optical fiber comprise optical fibers with faults;

if the single-wave optical power of the optical signal with each wavelength is smaller than the power threshold, controlling the optical switch to switch optical fibers for communicating the first optical transceiver and the second optical transceiver;

and if the single-wave optical power of the optical signal with any wavelength after switching is greater than or equal to the power threshold, determining that an optical fiber for communicating the first optical transceiver and the second optical transceiver before switching has a fault.

11. A fault detection method for an optical fiber link is characterized in that the optical fiber link comprises a first optical transceiver device, a second optical transceiver device and a plurality of optical fibers connected between the first optical transceiver device and the second optical transceiver device, each optical fiber is respectively connected with the first optical transceiver device and the second optical transceiver device, and the plurality of optical fibers comprise a first optical fiber and a second optical fiber; the method comprises the following steps:

generating a detection light signal;

transmitting the detection optical signal to the first optical fiber;

transmitting the detection optical signal transmitted in the first optical fiber to the second optical fiber;

detecting an optical power of the transmitted optical signal in the second optical fiber;

detecting a first service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the first optical fiber;

detecting a second service optical power of a service optical signal transmitted by the second optical transceiver device to the first optical transceiver device through the second optical fiber;

and determining the fault position in the optical fiber link according to the detected optical power, the first service optical power and the second service optical power.

12. The method of claim 11, wherein said determining a location of a fault in the optical fiber link based on the detected optical power, the first traffic optical power, and the second traffic optical power comprises:

if the detected optical power is greater than or equal to the power threshold value, and the first service optical power and the second service optical power are both less than the power threshold value, determining that the second optical transceiver device has a fault, and the first optical fiber and the second optical fiber do not have a fault;

if the detected optical power and the target service optical power in the first service optical power and the second service optical power are both smaller than the power threshold, and the other service optical powers except the target service optical power are greater than or equal to the power threshold, determining that the target optical fiber in the first optical fiber and the second optical fiber has a fault, and the other optical fibers except the target optical fiber and the second optical transceiver device do not have faults;

the power of the service optical signal transmitted to the first optical transceiver device by the second optical transceiver device through the target optical fiber is the target service optical power.

13. The method of claim 12, wherein the first optical transceiver device comprises: an optical switch; the service optical signal sent by the second optical transceiver device includes optical signals of multiple wavelengths, and the first service optical power and the second service optical power are both powers of optical signals of target wavelengths in the multiple wavelengths;

determining a fault location in the optical fiber link according to the detected optical power, the first service optical power, and the second service optical power, further comprising:

if the detected optical power, the first service optical power and the second service optical power are all smaller than the power threshold, detecting a single-wave optical power of an optical signal of each wavelength in service optical signals sent by the second optical transceiver;

if the single-wave optical power of the optical signal with any wavelength is greater than or equal to the power threshold, determining that a target optical module used for transmitting the optical signal with the target wavelength in the second optical transceiver device has a fault, the optical module used for transmitting the optical signal with any wavelength has no fault, and an optical fiber currently used for communicating the first optical transceiver device with the second optical transceiver device has no fault, wherein the first optical fiber and the second optical fiber comprise optical fibers with faults;

14. The method of any of claims 11 to 13, further comprising:

and if detecting that the optical fiber which is currently used for communicating the first optical transceiver device and the second optical transceiver device in the optical fiber link has a fault, controlling an optical switch in the optical fiber link to switch the optical fiber which is used for communicating the first optical transceiver device and the second optical transceiver device to other optical fibers.

15. An optical communication system, the system comprising: an optical fibre link and a fault detection device as claimed in any one of claims 1 to 10;

the optical fiber link comprises a first optical transceiver device, a second optical transceiver device and a plurality of optical fibers connected between the first optical transceiver device and the second optical transceiver device.

16. The system of claim 15, wherein the first optical transceiver device is disposed on an indoor baseband processing unit side and connected to the indoor baseband processing unit;

the second optical transceiver device is disposed at a side of the active antenna unit and connected to the active antenna unit.