Fault detection method, related device and storage medium

Abstract

Provided in the embodiments of the present application are a fault detection method, a related device and a storage medium, which can reduce the delay of fault localization and thus improve detection efficiency. The method comprises: a first optical communication device sends to a second optical communication device first service light by means of an optical fiber, the first service light occupying a first band; the first optical communication device receives a combined optical signal by means of the optical fiber, the combined optical signal comprising detection light reflected by the optical fiber and second service light from the second optical communication device, the detection light occupying the first band, the second service light occupying a second band, and the first band being different from the second band; and the first optical communication device performs fault condition detection on the optical fiber on the basis of the combined optical signal.

Description

Method, related device and storage medium for fault detection

[0001] The present application claims priority from the Chinese patent application No. 202410869372.1 filed on June 28, 2024, and entitled "Method, related device and storage medium for fault detection", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of optical communication technology, and in particular to a method for fault detection, related device and storage medium. BACKGROUND

[0003] With the rapid development of optical networks, the detection and operation and maintenance of optical fibers in the optical networks are very important. Specifically, the optical network includes a first optical communication device and a second optical communication device, and an optical fiber connected between the first optical communication device and the second optical communication device.

[0004] To achieve the purpose of detection, an optical time domain reflectometer (OTDR) is connected to the first optical communication device. The OTDR sends optical pulses to the optical fiber, and the optical fiber reflects reflected light to the OTDR according to the optical pulses. The OTDR detects whether the optical fiber has a fault according to the reflected light.

[0005] However, the wavelength of the optical pulses emitted by the OTDR is different from the wavelength of the service light emitted by the first optical communication device. Therefore, the optical pulses need to occupy bandwidth resources, which reduces the bandwidth resources that can be occupied by the first optical communication device for sending services, and reduces the utilization rate of the bandwidth resources. The first optical communication device needs to be connected to an independent OTDR, which increases the hardware complexity. The optical pulses are pulse signals, and the fault detection is performed through the pulse signals, which reduces the detection efficiency and increases the time delay of locating the fault. The optical pulses have a large optical power, which can interfere with the transmission of the service light and reduce the signal quality of the service light. SUMMARY

[0006] The embodiments of the present application provide a method for fault detection, related device and storage medium, which can reduce the time delay of fault location and improve the detection efficiency.

[0007] In a first aspect, the embodiments of the present application provide a method for fault detection. The method comprises: first, a first optical communication device sends first service light to a second optical communication device through an optical fiber, the first service light occupying a first waveband. Second, the first optical communication device receives a combined light signal through the optical fiber, the combined light signal comprising detection light reflected by the optical fiber and second service light from the second optical communication device, the detection light occupying the first waveband, and the second service light occupying a second waveband, the first waveband being different from the second waveband. Wherein, the optical fiber transmits the first service light from the first optical communication device and the second service light from the second optical communication device. When the first service light passes through a reflection point in the optical fiber, the detection light is reflected to the first optical communication device. The reflection point in the optical fiber refers to a position in the optical fiber that can reflect the first service light. Specifically, the reflection point in the optical fiber is a position where the refractive index differs. For example, the reflection point can be an optical fiber connector, a connector or other optical devices that can exist in the optical fiber. The interface of these optical devices can reflect the first service light due to changes in refractive index or surface irregularities. For another example, the reflection point can reflect the first service light due to the existence of dirt, breakage, damage, bending, pressure or other situations in the optical fiber, which causes the refractive index to differ. The reflection point in the optical fiber can cause loss or interference of the first service light, thereby reducing the quality of the first service light transmission. Third, the first optical communication device detects the fault condition of the optical fiber according to the combined light signal.

[0008] By using the method shown in the embodiments, the first optical communication device directly sends the modulated first service light to the optical fiber, and detects the fault condition of the optical fiber based on the detection light reflected by the optical fiber, thereby avoiding detecting the fault condition of the optical fiber by using optical pulses, and further avoiding the interference of the large optical power of the optical pulses on the first service light, and improving the signal quality of the first service light. The embodiments shown directly detect faults by using the first service light and the detection light reflected by the optical fiber according to the first service light. Therefore, during the fault detection process, the transmission of the first service light does not need to be interrupted, thereby improving the transmission efficiency of the first service light. The first service light sent by the first optical communication device to the optical fiber is a modulated optical signal, rather than an optical pulse, thereby reducing the time delay of fault detection, and enabling real-time detection of the fault condition in the optical fiber. The detection light does not occupy the bandwidth resources occupied by the first service light. Therefore, the transmission of the detection light and the transmission of the first service light are isolated from each other, thereby effectively suppressing the interference of the transmission of the detection light on the first service light, and improving the utilization rate of the bandwidth resources.

[0009] In an optional implementation of the first aspect, the first optical communication device detects the fault condition of the optical fiber according to the combined optical signal includes: the first optical communication device detects the fault condition of the optical fiber according to a detection signal and a reference signal, the detection signal is converted from the detection light, and the reference signal is the same as the service signal, and the first service light is converted from the service signal.

[0010] According to the implementation, the first optical communication device copies the service signal to obtain the reference signal to detect the fault condition of the optical fiber through the reference signal and the detection signal, which helps to improve the accuracy of fault detection.

[0011] In an optional implementation of the first aspect, the first optical communication device includes an optical module and a device single board, and the first optical communication device sends the first service light to the second optical communication device through the optical fiber includes: the device single board sends the service signal to the optical module; the optical module converts the service signal to obtain the first service light; before the first optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal, the method further includes: the optical module obtains the reference signal according to the service signal; the first optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal includes: the optical module detects the fault condition of the optical fiber according to the detection signal and the reference signal.

[0012] According to the implementation, the optical module of the first optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal, which improves the efficiency of fault detection and realizes real-time detection of the fault condition of the optical fiber.

[0013] In an optional implementation of the first aspect, the first optical communication device includes an optical module and a device single board, and the first optical communication device sends the first service light to the second optical communication device through the optical fiber includes: the device single board sends the service signal to the optical module; the optical module converts the service signal to obtain the first service light; before the first optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal, the method further includes: the device single board obtains the reference signal according to the service signal; the device single board receives the detection signal from the optical module; the first optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal includes: the device single board detects the fault condition of the optical fiber according to the detection signal and the reference signal.

[0014] According to the implementation manner, the device single board is used to detect the fault condition of the optical fiber, power consumption of the optical module is reduced, heat dissipation difficulty of the optical module is reduced, reliability of the optical module is improved, and signal quality of the optical module for transmitting and receiving light signals is improved.

[0015] In an optional implementation manner of the first aspect, the first optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal, including: the first optical communication device correlates the detection signal and the reference signal to obtain a correlation curve, the correlation curve representing correlation of the detection signal and the reference signal with time; if there is at least one correlation peak in the correlation curve, the first optical communication device detects that there is at least one fault in the optical fiber.

[0016] According to the implementation manner, the correlation of the detection signal and the reference signal is used to detect the fault and locate the fault, and the accuracy of fault detection is improved. Specifically, if there is a fault point (for example, dirt, breakage, damage, bending, pressure, loose or misposition of the optical fiber connector, etc.) in the optical fiber, the fault point reflects the detection light to the first optical communication device according to the first service light from the first optical communication device. The detection light and the first service light have the same frequency and modulation mode, and thus have high correlation. The high correlation presents one or more correlation peaks in the correlation curve. It can be understood that if one or more correlation peaks are detected in the correlation curve, it is determined that there is a fault in the optical fiber.

[0017] In an optional implementation manner of the first aspect, the correlation curve represents at least one of the following: correlation of light intensity of the detection signal and light intensity of the reference signal with time, correlation of amplitude of the detection signal and amplitude of the reference signal with time, correlation of phase of the detection signal and phase of the reference signal with time, and correlation of polarization state of the detection signal and polarization state of the reference signal with time.

[0018] According to the implementation manner, whether the correlation peak exists in the correlation curve is detected, the fault is detected and located, and the accuracy of fault detection is improved.

[0019] In an optional implementation manner of the first aspect, the first optical communication device detects that there is at least one fault in the optical fiber, and the first optical communication device detects that a fault time period corresponds to a fault position in the optical fiber, where the fault time period corresponds to a time period of the correlation peak in the correlation curve.

[0020] According to the implementation, the first optical communication device can further locate the specific position of the fault point in the optical fiber according to the position of the correlation peak in the correlation curve.

[0021] Based on the first aspect, in an optional implementation, after the first optical communication device transmits the first service light to the second optical communication device through the optical fiber, the method further includes: the first optical communication device transmits an optical pulse to the optical fiber; the first optical communication device receives K reflected lights reflected by the optical fiber, where K is any integer greater than or equal to 1; and the first optical communication device detects the fault condition of the optical fiber according to the K reflected lights.

[0022] According to the implementation, when the first optical communication device detects that the optical fiber may be interrupted, the mode of detecting the fault condition of the optical fiber is switched, so that the first optical communication device transmits an optical pulse to the optical fiber, and the first optical communication device receives a reflected light reflected by the optical fiber. The first optical communication device detects the fault condition of the optical fiber based on the OTDR technology, improves the efficiency and accuracy of the detection of the fault condition of the optical fiber, reduces the difficulty of the operation and maintenance of the optical fiber, and improves the operation and maintenance efficiency. The first optical communication device detects whether there is a breakpoint, fiber attenuation, attenuation of a fiber connector, and structural loss (for example, fiber bending and extrusion) of the optical fiber based on the K reflected signals, so as to accurately and quickly locate the fault type and fault position of the optical fiber.

[0023] Based on the first aspect, in an optional implementation, the first optical communication device includes an optical module and a device single board, and the first optical communication device transmitting the optical pulse to the optical fiber includes: if the optical module detects that the optical power corresponding to the second wave band is less than or equal to a power threshold, the optical module transmits the optical pulse to the optical fiber.

[0024] According to the implementation, if the first optical communication device determines that the optical power corresponding to the second wave band is less than or equal to the power threshold, it indicates that the service light occupying the second wave band emitted by the second optical communication device has a large loss during transmission through the optical fiber. The reason for the large loss during the transmission of the second service light may be that the optical fiber is broken, so as to switch the mode of detecting the fault condition of the optical fiber.

[0025] Based on the first aspect, in an optional implementation, the first optical communication device transmitting the optical pulse to the optical fiber includes: the optical module generates a pulse signal and converts the pulse signal into the optical pulse.

[0026] According to the implementation, the first optical communication device detects the fault condition of the optical fiber according to the reflected light based on the OTDR technology, improves the efficiency and accuracy of the detection of the fault condition of the optical fiber, reduces the difficulty of the operation and maintenance of the optical fiber, and improves the operation and maintenance efficiency.

[0027] In an optional implementation of the first aspect, before the first optical communication device sends the optical pulse to the optical fiber, the method further includes: the device board receiving interrupt indication information from the optical module, the interrupt indication information being used to indicate that the optical power corresponding to the second waveband is less than or equal to a power threshold; the device board sending a pulse signal to the optical module according to the interrupt indication information; and the optical module converting the pulse signal into the optical pulse.

[0028] According to the implementation, the first optical communication device determines that the optical fiber may have an interrupt or the like according to the interrupt indication information, and then switches the mode of detecting the fault condition of the optical fiber, so that the first optical communication device sends the optical pulse to the optical fiber, and the first optical communication device receives the reflected light reflected by the optical fiber. The first optical communication device detects the fault condition of the optical fiber according to the reflected light based on the OTDR technology, improves the efficiency and accuracy of the detection of the fault condition of the optical fiber, reduces the difficulty of the operation and maintenance of the optical fiber, and improves the operation and maintenance efficiency.

[0029] In an optional implementation of the first aspect, the optical pulse occupies the first waveband.

[0030] According to the implementation, the optical pulse occupies the first waveband, so that the first optical communication device multiplexes the same laser for the optical pulse and the first service light, reduces the number of hardware of the first optical communication device, and reduces the hardware complexity of the first optical communication device.

[0031] In a second aspect, the embodiments of the present application provide an optical communication device, including a sending module, a receiving module, and a processing module; the sending module is used to send first service light to another optical communication device through an optical fiber, the first service light occupying a first waveband; the receiving module is used to receive a combined optical signal through the optical fiber, the combined optical signal including detection light reflected by the optical fiber and second service light from the other optical communication device, the detection light occupying the first waveband, and the second service light occupying a second waveband, the first waveband being different from the second waveband; and the processing module is used to detect a fault condition of the optical fiber according to the combined optical signal. The optical communication device shown in the aspect performs the process and beneficial effects of the fault detection method, and the description is not repeated in detail, please refer to the first aspect.

[0032] In a third aspect, an optical communication device is provided. The optical communication device comprises a device board and an optical module. The device board is configured to send a service signal to the optical module. The optical module is configured to convert the service signal to obtain first service light, send the first service light to a second optical communication device via an optical fiber, the first service light occupying a first wavelength band, receive a combined light signal via the optical fiber, the combined light signal comprising a detection light reflected by the optical fiber and a second service light from the second optical communication device, the detection light occupying the first wavelength band, the second service light occupying a second wavelength band, the first wavelength band being different from the second wavelength band, the combined light signal being used to detect a fault condition of the optical fiber. Specifically, the device board can detect the fault condition of the optical fiber according to the combined light signal, or the optical module can detect the fault condition of the optical fiber according to the combined light signal. For the process and advantages of the optical communication device in detecting the fault condition of the optical fiber, please refer to the first aspect.

[0033] Based on the third aspect, in an optional implementation, the optical module is further configured to obtain a reference signal according to the service signal, the reference signal being the same as the service signal, convert the detection light to obtain a detection signal, and detect the fault condition of the optical fiber according to the detection signal and the reference signal. In this implementation, the optical module detects the fault condition of the optical fiber according to the combined light signal.

[0034] Based on the third aspect, in an optional implementation, in the process of detecting the fault condition of the optical fiber according to the detection signal and the reference signal, the optical module is specifically configured to correlate the detection signal and the reference signal to obtain a correlation curve, the correlation curve representing the correlation between the detection signal and the reference signal over time, and if there is at least one correlation peak in the correlation curve, the first optical communication device detects that there is at least one fault in the optical fiber.

[0035] Based on the third aspect, in an optional implementation, when the optical module detects that there is at least one fault in the optical fiber, the optical module further detects that a fault time period has a fault at a corresponding position in the optical fiber, wherein the fault time period is a time period corresponding to the correlation peak in the correlation curve.

[0036] Based on the third aspect, in an optional implementation, after the optical module sends the first service light to the second optical communication device via the optical fiber, the optical module is further configured to send an optical pulse to the optical fiber, receive K reflected lights reflected by the optical fiber, K being any integer greater than or equal to 1, and detect the fault condition of the optical fiber according to the K reflected lights.

[0037] In an optional implementation of the third aspect, during the process in which the optical module sends the optical pulse to the optical fiber, if the optical module detects that the optical power corresponding to the second waveband is less than or equal to a power threshold, the optical module is configured to send the optical pulse to the optical fiber.

[0038] In an optional implementation of the third aspect, during the process in which the optical module sends the optical pulse to the optical fiber, the optical module is configured to convert the pulse signal into the optical pulse.

[0039] In an optional implementation of the third aspect, the device board is further configured to obtain a reference signal from the service signal, the reference signal being the same as the service signal; the optical module is further configured to convert the detection light to obtain a detection signal and send the detection signal to the device board; and the device board is further configured to detect the fault condition of the optical fiber according to the detection signal and the reference signal.

[0040] In an optional implementation of the third aspect, the correlation curve represents at least one of the following:

[0041] a correlation between the light intensity of the detection signal and the light intensity of the reference signal over time, a correlation between the amplitude of the detection signal and the amplitude of the reference signal over time, a correlation between the phase of the detection signal and the phase of the reference signal over time, and a correlation between the polarization state of the detection signal and the polarization state of the reference signal over time.

[0042] In an optional implementation of the third aspect, when the device board detects that the optical fiber has at least one fault, the device board is further configured to detect that a fault time period has a fault at a corresponding position in the optical fiber, where the fault time period is a time period corresponding to the correlation peak in the correlation curve.

[0043] In an optional implementation of the third aspect, the device board is further configured to receive an interrupt indication information from the optical module, the interrupt indication information being configured to indicate that the optical power corresponding to the second waveband is less than or equal to a power threshold; send a pulse signal to the optical module according to the interrupt indication information; and the optical module is configured to convert the pulse signal into the optical pulse.

[0044] In a fourth aspect, an embodiment of the present application provides an optical module, which comprises a first analog-digital converter, a first processor, a first digital-analog converter and an optical modulator connected in sequence, further comprises a second digital-analog converter, a second processor, a second analog-digital converter and an optical demodulator connected in sequence, further comprises a laser connected with the optical modulator and the optical demodulator respectively, and a separation module connected with the optical demodulator and the optical modulator respectively. The second processor is configured to detect the fault condition of the optical fiber according to the combined optical signal. For specific implementation process and beneficial effects, refer to the first aspect.

[0045] In a fifth aspect, an embodiment of the present application provides a device board, which comprises a first controller and a digital-analog converter connected in sequence, further comprises a second controller and an analog-digital converter connected in sequence, the digital-analog converter and the analog-digital converter are connected with the optical module respectively, and the second controller is configured to detect the fault condition of the optical fiber. For specific implementation process and beneficial effects, refer to the first aspect.

[0046] In a sixth aspect, an embodiment of the present application provides an optical module, which comprises a first analog-digital converter, a first processor, a first digital-analog converter and an optical modulator connected in sequence, further comprises a second digital-analog converter, a second processor, a second analog-digital converter and an optical demodulator connected in sequence, further comprises a laser connected with the optical modulator and the optical demodulator respectively, and a separation module connected with the optical demodulator and the optical modulator respectively. The second processor is configured to perform digital signal processing on the detection signal corresponding to the detection light, and send the detection signal to the device board. For specific implementation process and beneficial effects, refer to the first aspect.

[0047] In a seventh aspect, an embodiment of the present application provides an optical network, which comprises a first optical communication device and a second optical communication device, the first optical communication device comprises a device board and an optical module, the second optical communication device comprises a device board and an optical module, and the optical module of the first optical communication device is connected with the optical module of the second optical communication device through an optical fiber.

[0048] In an eighth aspect, an embodiment of the present application provides a computer readable storage medium, which stores computer instructions, and the computer instructions instruct a computer device to execute the method of any one of the first aspect.

[0049] In a ninth aspect, an embodiment of the present application provides a chip, which comprises a programmable logic circuit and / or program instructions, and when the chip is running, is configured to execute the method of any one of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is an example diagram of an embodiment of an optical network provided by the present application;

[0051] Figure 2 is an example diagram of an embodiment of an optical communication device provided by the present application;

[0052] Figure 3 is a flowchart of an embodiment of a fault detection method provided by the present application;

[0053] Figure 4 is an example diagram of converting a service signal into a first service light as shown in Figure 3;

[0054] Figure 5 is an example diagram of a spectrum of a first service light provided by the present application;

[0055] Figure 6 is an example diagram of a spectrum of a second service light provided by the present application;

[0056] Figure 7 is an example diagram of a spectrum of a first combined light signal provided by the present application;

[0057] Figure 8 is a signal flowchart during a fault detection process provided by the present application;

[0058] Figure 9 is an example diagram of a correlation curve provided by the present application;

[0059] Figure 10 is an example diagram of a second embodiment of an optical communication device provided by the present application;

[0060] Figure 11 is a flowchart of a second embodiment of a fault detection method provided by the present application;

[0061] Figure 12 is a flowchart of a third embodiment of a fault detection method provided by the present application;

[0062] Figure 13 is an example diagram of a third embodiment of an optical communication device provided by the present application. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0064] Embodiments of the present application provide a fault detection method. The structure of an optical network to which the fault detection method is applied is explained in combination with FIG. 1. FIG. 1 is an example diagram of an embodiment structure of an optical network provided by the present application. The optical network 100 includes a first optical communication device 110 and a second optical communication device 120, and the first optical communication device 110 and the second optical communication device 120 are connected through an optical fiber. The number of communication devices included in the optical network 100 is not limited in the present example. For example, the first optical communication device 110 can be connected to multiple second optical communication devices 120 through a splitter. The networking type of the optical network is not limited in the present example. For example, the optical network can adopt a ring networking or a star networking. The network type to which the optical network 100 is applied is not limited in the present example. For example, if the optical network 100 shown in the present example is applied to a passive optical network (PON), one of the first optical communication device 110 and the second optical communication device 120 can be an optical network unit (ONU) or an optical network terminal (ONT), and the other of the first optical communication device 110 and the second optical communication device 120 can be an optical line terminal (OLT). If the optical network 100 is applied to an optical transport network (OTN), the first optical communication device 110 and the second optical communication device 120 can both be OTN devices. The optical network 100 shown in the present example can also be applied to a data center network (DCN) or a metropolitan area network, etc., and the specific type is not limited. Taking the first optical communication device 110 as an example, the type of the first optical communication device 110 is not limited in the present example. For example, the first optical communication device 110 can be an optical transmission device, an optical access device, a router, a switch, a wireless base station, a wireless remote access device, a wireless baseband signal processing device, etc., or a computing server (usually referred to as a server), a high-performance computer (HPC), a storage server, or a memory resource pool, etc.

[0065] The structure of the first optical communication device is explained in combination with FIG. 2, and the structure of the second optical communication device is not limited in the present example. FIG. 2 is an example diagram of an embodiment structure of an optical communication device provided by the present application. Specifically, the optical communication device shown in FIG. 2 can be the first optical communication device or the second optical communication device shown in FIG. 1.

[0066] With the growth of digital information demand and business demand, the network capacity of optical networks is increasing dramatically. The spectral efficiency of coherent optical transmission technology is high, which can maintain excellent transmission performance and overcome the serious loss generated by high-speed transmission of signals, and is widely used in submarine cables, long-distance backbone, and metropolitan transmission networks. Taking the optical communication device shown in FIG. 2 as an example, the first optical communication device 110 adopts a coherent sending and receiving architecture. The first optical communication device 110 includes a device single board 200 and an optical module 201 connected with the device single board 200. The number of optical modules 201 included in the first optical communication device 110 is not limited in the embodiment, and the optical module 201 can also be referred to as an optical transceiver module or an optical-electric conversion module, etc. The device single board 200 and the optical module 201 can be an integrated device, or the device single board 200 is an independent pluggable single board. The device single board 200 has packaged a controller and a connector. The optical module 201 is connected to the controller through the connector. The optical module 201 includes a transport (TX) channel, a receive (RX) channel, a separation module 230, and a laser 240. The TX channel specifically includes a first analog-to-digital converter (ADC) 211, a first processor 210, a first digital-to-analog converter (DAC) 216, and an optical modulator 217 connected in sequence. The RX channel specifically includes a second DAC 221, a second processor 220, a second ADC 227, and an optical demodulator 228 connected in sequence. The laser 240 is connected with the optical modulator 217 and the optical demodulator 228 respectively, and the optical modulator 217 and the optical demodulator 228 are further connected with the separation module 230. Specifically, the separation module 230 is further connected with an optical fiber 250 supporting Bidirectional (BiDi). Taking an example that the optical modulator 217 and the optical demodulator 228 are connected with the same laser 240, in other examples, the optical modulator 217 and the optical demodulator 228 can also be connected with different lasers, which are not limited in detail.

[0067] The first processor 210 includes a demultiplexer (DEMUX) 212 connected with the first ADC 211, a multiplexer (MUX) 215 connected with the first DAC 216, and one or more processing units connected between the first ADC 211 and the first DAC 216. In this embodiment, the first processor 210 includes two processing units, i.e., a first processing unit 213 and a first processing unit 214. For example, the first processing unit 213 and the first processing unit 214 are two independent chips or integrated circuits, and the type of chip is a digital signal processor (DSP). However, the type of chip is not limited in this embodiment. For example, the type of chip or integrated circuit can also be an optical digital signal processor (oDSP), a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a microcontroller unit (MCU), a programmable logic device (PLD), a network card chip, a storage interface chip, or other integrated chips, or any combination of the above chips or processing modules, and the specific type of chip is not described herein. For another example, the first processing unit 213 and the first processing unit 214 can be software modules in the form of software in the first processor 210. For another example, the first processing unit 213 and the first processing unit 214 can be a combination of hardware (i.e., a chip or an integrated circuit) and a software module in the form of software in the first processor 210, and the specific type of chip is not limited in this embodiment. The software module can be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, or the like. The storage medium is located in a memory, and the first processor 210 reads information in the memory to realize the first processing unit 213 and the first processing unit 214 in combination with the hardware.For another example, the first processing unit 213 and the first processing unit 214 can be integrated on the same chip or integrated circuit, and the chip type can be a DSP, an oDSP, an FPGA, an ASIC, a SoC, a CPU, an NP, an MCU, a PLD, a network card chip, a storage interface chip, or other integrated chips, or the above chips, or any combination of processing modules, etc., and the specific chip type is not described herein. The optical modulator 217 can be a coherent driver modulator (CDM), and the specific type of the optical modulator 217 is not limited in the embodiment.

[0068] The second processor 220 includes a multiplexer 222 connected with the second DAC 221 and a demultiplexer 226 connected with the second ADC 227, and further includes one or more second processing units connected between the multiplexer 222 and the demultiplexer 226. In the embodiment, the second processor 220 includes two second processing units, i.e., a second processing unit 223 and a second processing unit 224. The description of each second processing unit is the same as the description of the first processing unit, and is not described herein. The second processor 220 further includes a fault detection unit 225 connected between the multiplexer 222 and the demultiplexer 226. The type of the fault detection unit 225 is the same as the type of the first processing unit, and is not described herein. The number of the fault detection units included in the second processor 220 is not limited in the embodiment. In the embodiment, the fault detection unit 225 is integrated on the second processor 220, and in other examples, the fault detection unit 225 can be in a separate structure from the second processor 220. The fault detection unit 225 is connected with each first processing unit in the first processor 210, for example, the fault detection unit 225 is connected with the first processing unit 213 and the first processing unit 214, respectively. The optical demodulator 228 can be an integrated coherent receiver (ICR).

[0069] The laser 240 is connected with the optical modulator 217 and the optical demodulator 228 respectively. The laser 240 can be a laser diode (LD), an external cavity laser diode (ECL), a quantum well laser (QL), a distributed feedback (DFB) laser, an electro-absorption modulated laser (EML) or a vertical cavity surface emitting laser (VCSEL). The splitting module 230 is connected with the optical modulator 217 and the optical demodulator 228 respectively. The splitting module 230 can be a circulator or a splitter. For example, the splitting module 230 is a circulator, which includes a first port, a second port and a third port. The first port of the circulator is connected with the optical fiber 250, the second port of the circulator is connected with the optical modulator 217, and the third port of the circulator is connected with the optical demodulator.

[0070] Based on the structure of the optical communication device shown in FIG. 2, the method for detecting faults provided by the embodiments of the present application is explained in combination with FIG. 3. Based on the method shown in the embodiments, the fault condition of the optical fiber connected between the first optical communication device and the second optical communication device can be detected. FIG. 3 is a flow chart of the first embodiment of the method for detecting faults provided by the present application.

[0071] In step 301, the first optical communication device sends first service light to the second optical communication device through the optical fiber.

[0072] If the optical communication device shown in FIG. 2 is the first optical communication device, the device board sends the service signal a to the TX channel of the optical module. Specifically, the device board sends the service signal a to the first ADC 211 of the TX channel. In combination with FIG. 2 and FIG. 4, the service signal a is converted into the first service light by the device board, as shown in FIG. 4. The first ADC 211 converts the service signal a into the converted service signal a0, which is a digital signal. The first ADC 211 sends the service signal a0 to the demultiplexer 212. The service signal a0 is a multiplexed signal, thereby improving the resource utilization efficiency of the service signal transmission. The demultiplexer 212 demultiplexes the service signal a0 to obtain the first service signal independent of each other. For example, the demultiplexer 212 demultiplexes the service signal a0 into the first service signal a1 and the first service signal a2, the first service signal a1 occupies a different waveband from the first service signal a2. For example, the first service signal a1 occupies the waveband b1, and the first service signal a2 occupies the waveband b2, both of which belong to the first waveband. The manner in which the demultiplexer 212 demultiplexes is not limited in the present embodiment. For example, the demultiplexer 212 demultiplexes the first service signal a1 to obtain the first service signal a1 and the first service signal a2. The demultiplexer 212 sends the first service signal a1 to the first processing unit 213, and sends the first service signal a2 to the first processing unit 214, which respectively processes the first service signal a1 and the first service signal a2. Taking the first processing unit 213 as an example, the first processing unit 213 compensates the first service signal a1 to suppress the inter symbol interference (ISI). Specifically, the first processing unit 213 can compensate based on the feed forward equalizer (FFE) or the continuous time linear equalizer (CTLE) gear, etc. The type of digital signal processing performed by the first processing unit 213 is not limited in the present embodiment. For example, the first processing unit 213 can also perform clock recovery, channel compensation, multiple-in multiple-out (MIMO) equalization, etc. The first processing unit 213 processes the first service signal a1 to obtain the first service signal a3. The first processing unit 214 processes the first service signal a2 to obtain the first service signal a4, the specific process is described in the description of the first processing unit 213 processing the first service signal a1, and is not described in detail.The first processing unit 213 and the first processing unit 214 send the first service signal a3 and the first service signal a4 after digital signal processing to the multiplexer 215. The multiplexer 215 multiplexes the first service signal a3 and the first service signal a4 to obtain a multiplexed signal a5. The multiplexer 215 sends the multiplexed signal a5 to the first DAC 216. The first DAC 216 performs digital-to-analog conversion on the multiplexed signal a5 to obtain an analog signal a6. The first DAC 216 sends the analog signal a6 to the optical modulator 217.

[0073] It is to be noted that the position of the PBS is not limited in the embodiment, for example, the PBS can also be connected between the optical modulator 217 and the laser 240. The PBS receives the laser signal from the laser 240 and divides the laser signal into X-polarized light and Y-polarized light. The electric field vibration direction of the X-polarized light is parallel to the X-axis, and the electric field vibration direction of the Y-polarized light is parallel to the Y-axis. It can be understood that the polarization state of the X-polarized light is orthogonal to the polarization state of the Y-polarized light. The optical modulator 217 divides the analog signal a61 in the analog signal a6 into a real part a611 and an imaginary part a612, and divides the analog signal a62 in the analog signal a6 into a real part a621 and an imaginary part a622. The analog signal a61 is converted from the first service signal a1 occupying the wave band b1, and the analog signal b62 is converted from the first service signal a2 occupying the wave band b2. The optical modulator 217 modulates the real part a611 and the imaginary part a612 based on phase shift keying (PSK) or quadrature amplitude modulation (QAM) to obtain a first complex signal (the first complex signal includes the modulated real part a611 and the imaginary part a612). The optical modulator 217 modulates the first complex signal onto the X-polarized light from the laser to obtain modulated X-polarized light. The optical modulator 217 modulates the real part a621 and the imaginary part a622 to obtain a second complex signal (the second complex signal includes the modulated real part a621 and the imaginary part a622). The optical modulator 217 modulates the second complex signal onto the Y-polarized light from the laser to obtain modulated Y-polarized light. The optical modulator 217 shown in the embodiment also integrates a polarization beam combiner (PBC). The PBC polarization multiplexes the modulated X-polarized light and the modulated Y-polarized light to obtain the first service light. It is to be noted that the position of the PBC is not limited in the embodiment, for example, the PBC can also be in a separated state from the optical modulator 217, and the PBC is connected between the optical modulator 217 and the separation module 230.

[0074] The spectrum diagram of the first service light modulated by the optical modulator 217 can be seen in FIG. 5, which is a spectrum diagram of the first service light provided by the present application. The first service light includes a first subcarrier 501 and a second subcarrier 502. The first subcarrier 501 and the second subcarrier 502 are both optical signals, and the first subcarrier 501 occupies a waveband b1 in the first waveband and corresponds to a certain amplitude in the X polarization state direction and a certain amplitude in the Y polarization state direction. The second subcarrier 502 occupies a waveband b2 in the first waveband and corresponds to a certain amplitude in the X polarization state direction and a certain amplitude in the Y polarization state direction. After the separation module 230 receives the first service light from the optical modulator 217, the first service light is transmitted to the optical fiber 250, and the first service light is transmitted to the second optical communication device through the optical fiber 250.

[0075] Step 302, the second optical communication device transmits the second service light to the first optical communication device through the optical fiber.

[0076] The process of the second optical communication device transmitting the second service light to the first optical communication device through the optical fiber 250 is the same as the process of the first optical communication device transmitting the first service light to the second optical communication device through the optical fiber 250 shown in step 301, and will not be repeated here.

[0077] The spectrum diagram of the second service light emitted by the second optical communication device can be seen in FIG. 6, which is a spectrum diagram of the second service light provided by the present application. The second service light includes a third subcarrier 601 and a fourth subcarrier 602. The third subcarrier 601 occupies a waveband b3 in the second waveband and corresponds to a certain amplitude in the X polarization state direction and a certain amplitude in the Y polarization state direction. The fourth subcarrier 602 occupies a waveband b4 in the second waveband and corresponds to a certain amplitude in the X polarization state direction and a certain amplitude in the Y polarization state direction. The waveband b3 is different from the waveband b4, and the first waveband is different from the second waveband.

[0078] The present embodiment does not limit the execution timing between step 301 and step 302.

[0079] Step 303, the first optical communication device receives the first combined light signal.

[0080] As shown in steps 301 and 302, the optical fiber transmits the first service light from the first optical communication device and the second service light from the second optical communication device. When the first service light passes through the reflection point in the optical fiber, the first detection light is reflected to the first optical communication device. Similarly, when the second service light passes through the reflection point in the optical fiber, the second detection light is reflected to the second optical communication device. The reflection point in the optical fiber refers to a position in the optical fiber that can reflect the service light. Specifically, the reflection point in the optical fiber is a position where the refractive index is different. For example, the reflection point can be an optical fiber connector, a connector or other optical device that can exist in the optical fiber. The interface of these optical devices can reflect the service light due to changes in refractive index or surface unevenness. For another example, the reflection point can reflect the service light due to the existence of dirt, breakage, damage, bending, pressure and the like in the optical fiber, so that the refractive index is different. The reflection point in the optical fiber can cause loss or interference of the service light, thereby reducing the quality of the service light transmission.

[0081] The first combined light signal received by the first optical communication device includes the first detection light reflected by the optical fiber and the second service light from the second optical communication device. FIG. 7 is a spectrum diagram of the first combined light signal provided by the present application. The first combined light signal includes a third subcarrier 601 and a fourth subcarrier 602 from the second optical communication device. The first combined light signal further includes a first detection subcarrier 701 reflected by the reflection point in the optical fiber according to the first subcarrier 501 from the first optical communication device and a second detection subcarrier 702 reflected by the reflection point according to the second subcarrier 502 from the first optical communication device. The size relationship between the third subcarrier 601, the fourth subcarrier 602, the first detection subcarrier 701 and the second detection subcarrier 702 shown in FIG. 7 is not limited. It can be understood that since the first subcarrier 501 and the second subcarrier 502 occupy the first waveband, the first detection subcarrier 701 and the second detection subcarrier 702 both occupy the first waveband. Specifically, the first subcarrier 501 occupies a waveband b1 in the first waveband, and the first detection subcarrier 701 occupies the waveband b1 in the first waveband. Similarly, the second subcarrier 502 occupies a waveband b2 in the first waveband, and the second detection subcarrier 702 occupies the waveband b2 in the first waveband.

[0082] In step 304, the first optical communication device detects the fault condition of the optical fiber according to the first combined light signal.

[0083] In this embodiment, the fault detection unit in the second processor 220 detects the fault condition of the optical fiber. The specific process of detecting the fault condition of the optical fiber by the fault detection unit is described below.

[0084] First, the fault detection unit obtains the reference signal.

[0085] Specifically, continuing to refer to FIG. 2, FIG. 4 and FIG. 8, which is a signal flow diagram in the fault detection process provided by the present application. The first processing unit 213 receives the first service signal a1 from the demultiplexer 212, and performs digital signal processing on the first service signal a1 to obtain the first service signal a3. In order to realize the detection of the fiber fault condition, the first processing unit 213 copies the first service signal a3 to obtain the first reference signal c1, and the first service signal a3 is the same as the first reference signal c1. The first processing unit 213 sends the first reference signal c1 to the fault detection unit 225 in the second processor 220. Similarly, the first processing unit 214 receives the first service signal a2 from the demultiplexer 212, and performs digital signal processing on the first service signal a2 to obtain the first service signal a4. In order to realize the detection of the fiber fault condition, the first processing unit 214 copies the first service signal a4 to obtain the second reference signal c2, and the first service signal a4 is the same as the second reference signal c2. The first processing unit 214 sends the second reference signal c2 to the fault detection unit 225 in the second processor 220. It should be clear that, taking the first processing unit 213 as an example, the first reference signal c1 sent by the first processing unit 213 to the fault detection unit 225 is an example of copying the first service signal a3 after digital signal processing, which helps to improve the accuracy of fault detection. In other examples, the reference signal sent by the first processing unit 213 to the fault detection unit 225 is an example of copying the first service signal a1 without digital signal processing, which is not limited in particular.

[0086] Secondly, after the separation module 230 receives the first combined optical signal from the optical fiber, it sends the first combined optical signal to the optical demodulator 228.

[0087] Again, the optical demodulator 228 can integrate a PBS, which decomposes the first combined optical signal into a first decomposed optical signal d1 and a second decomposed optical signal d2, the polarization state of the first decomposed optical signal d1 intersects with the polarization state of the second decomposed optical signal d2. Specifically, the polarization state of the first decomposed optical signal d1 is X polarization state, and the polarization state of the second decomposed optical signal d2 is Y polarization state. The PBS receives the laser signal from the laser 240, and divides the laser signal into X polarization light and Y polarization light. The optical demodulator 228 demodulates the first decomposed optical signal d1 decomposed from the first combined optical signal by the X polarization light to obtain an analog signal d3. The optical demodulator 228 demodulates the second decomposed optical signal d2 decomposed from the first combined optical signal by the Y polarization light to obtain an analog signal d4. The optical demodulator 228 sends the analog signal d3 and the analog signal d4 to the second ADC 227, and the number of analog signals d3 and d4 is not limited in the embodiment. The second ADC 227 converts the analog signal d3 into a digital signal d5, and converts the analog signal d4 into a digital signal d6. The second ADC 227 sends the digital signal d5 and the digital signal d6 to the demultiplexer 226. The demultiplexer 226 demultiplexes the second service signal d7 occupying the wavelength band b3, the second service signal d8 occupying the wavelength band b4, the first detection signal e1 occupying the wavelength band b1, and the second detection signal e2 occupying the wavelength band b2 from the digital signal d5 and the digital signal d6. As shown above, the wavelength band b3 and the wavelength band b4 belong to the second wavelength band, and the wavelength band b1 and the wavelength band b2 belong to the first wavelength band. The demultiplexer 226 sends the second service signal d7 to the second processing unit 223, sends the second service signal d8 to the second processing unit 224, and sends the first detection signal e1 and the second detection signal e2 to the fault detection unit 225. The second processing unit 223 receives the second service signal d7, and performs digital signal processing on the second service signal d7, for example, the second processing unit 223 performs equalization on the second service signal d7. For details, please refer to step 301. The type of digital signal processing performed by the second processing unit 223 is not limited in the embodiment, for example, timing recovery, signal recovery, polarization, dispersion compensation, etc. The second processing unit 223 sends the second service signal d9 after digital signal processing to the multiplexer 222. The second processing unit 224 performs digital signal processing on the second service signal d8 to obtain the second service signal d10 after digital signal processing. For details, please refer to the description of the digital signal processing performed by the second processing unit 223. The second processing unit 224 sends the second service signal d10 after digital signal processing to the multiplexer 222.The multiplexer 222 multiplexes the second service signal d9 and the second service signal d10 to obtain a digital signal d11. The multiplexer 222 sends the digital signal d11 to the second DAC 221. The second DAC 221 performs digital-to-analog conversion on the digital signal d11 to obtain a service signal d12. The second DAC 221 sends the service signal d12 to the device board 200.

[0088] After the fault detection unit 225 receives the first detection signal e1 and the second detection signal e2, the first detection signal e1 and the second detection signal e2 can be respectively subjected to digital signal processing. For details of the digital signal processing, please refer to the description of the digital signal processing performed by the second processing unit 222. It can be understood that the fault detection unit 225 performs digital signal processing on the first detection signal e1 to obtain a first detection signal e3, and performs digital signal processing on the second detection signal e2 to obtain a second detection signal e4.

[0089] Again, the fault detection unit 225 correlates the first reference signal c1, the second reference signal c2, the first detection signal e3, and the second detection signal e4 to obtain a correlation curve, which represents the correlation between the first reference signal c1, the second reference signal c2, and the first detection signal e3, the second detection signal e4 over time. The fault detection unit can detect the fiber fault condition based on the correlation curve. In this embodiment, the fault detection unit 225 correlates the coherent first detection signal e3 and the second detection signal e4, which are detection signals subjected to digital signal processing. In other examples, the fault detection unit 225 can also detect faults by using the first detection signal e1 and the second detection signal e2, which are not subjected to digital signal processing. The specific fault detection process is not limited and will be described in the following examples.

[0090] Example 1

[0091] The fault detection unit shown in the example correlates the first reference signal c1, the second reference signal c2, the first detection signal e3, and the second detection signal e4 to obtain a first correlation curve. Wherein, FIG. 9 is an example of a correlation curve provided by the present application. The correlation curve shown in the example reflects the correlation of the light intensity of the detection signal (i.e., the first detection signal e3 and the second detection signal e4) and the light intensity of the reference signal (i.e., the first reference signal c1 and the second reference signal c2) with time. The first correlation curve shown in FIG. 9 is located in a coordinate system, the horizontal coordinate is time, and the vertical coordinate is correlation degree. The first optical communication device receives the first combined optical signal at time t1, and obtains the first detection signal e3 and the second detection signal e4 from the first combined optical signal. For specific process description, please refer to FIG. 8, and details are not repeated. The fault detection unit 225 correlates the first detection signal e3 and the second detection signal e4 received at time t1 with the first detection signal e3 and the second detection signal e4 to obtain the correlation degree P1 corresponding to time t1 in the first correlation curve. For specific process, please refer to the following optional mode:

[0092] Mode 1

[0093] The fault detection unit obtains the light intensity PXa1 of the X-polarized light included in the first detection signal e3 and the light intensity PXc1 of the X-polarized light included in the first reference signal c1 to obtain the first correlation LX1 = PXa1 * PXc1. The fault detection unit obtains the light intensity PXa2 of the X-polarized light included in the second detection signal e4 and the light intensity PXc2 of the X-polarized light included in the second reference signal c2 to obtain the second correlation LX2 = PXa2 * PXc2.

[0094] The fault detection unit obtains the light intensity PYa1 of the Y-polarized light included in the first detection signal e3 and the light intensity PYc1 of the Y-polarized light included in the first reference signal c1 to obtain the third correlation LY1 = PYa1 * PYc1. The fault detection unit obtains the light intensity PYa2 of the Y-polarized light included in the second detection signal e4 and the light intensity PYc2 of the Y-polarized light included in the second reference signal c2 to obtain the fourth correlation LY2 = PYa2 * PYc2.

[0095] Then, the fault detection unit obtains the correlation degree P1 = |LX1| + |LX2| + |LY1| + |LY2| corresponding to time t1 in the first correlation curve.

[0096] Similarly, the fault detection unit obtains the correlation degree corresponding to time t2, the correlation degree PN corresponding to time tN, and so on in the first correlation curve.

[0097] Mode 2

[0098] The fault detection unit obtains the sum Pa1 of the light intensity PXa1 of the X-polarized light and the light intensity PYa1 of the Y-polarized light included in the first detection signal e3, that is, Pa1 = PXa1 + PYa1. The fault detection unit obtains the sum Pc1 of the light intensity PXc1 of the X-polarized light and the light intensity PYc1 of the Y-polarized light included in the first reference signal c1, that is, Pc1 = PXc1 + PYc1. The fault detection unit obtains the first correlation L1 between the first detection signal e3 and the first reference signal c1, that is, L1 = Pa1 * Pc1.

[0099] The fault detection unit obtains the sum Pa2 of the light intensity PXa2 of the X-polarized light and the light intensity PYa2 of the Y-polarized light included in the second detection signal e4, that is, Pa2 = PXa2 + PYa2. The fault detection unit obtains the sum Pc2 of the light intensity PXc2 of the X-polarized light and the light intensity PYc2 of the Y-polarized light included in the second reference signal c2, that is, Pc2 = PXc2 + PYc2. The fault detection unit obtains the second correlation L2 between the second detection signal e4 and the second reference signal c2, that is, L2 = Pa2 * Pc2.

[0100] The fault detection unit obtains the correlation degree P1 corresponding to time t1 in the first correlation curve, that is, P1 = |L1| + |L2|.

[0101] Similarly, the fault detection unit obtains the correlation degree corresponding to time t2, the correlation degree PN corresponding to time tN, and so on in the first correlation curve.

[0102] The fault detection unit obtains the correlation degree P1 corresponding to time t1 in the first correlation curve, that is, P1 = |L1| + |L2|.

[0103] Mode 3

[0104] The fault detection unit obtains the sum Ls1 of the light intensity PXa1 of the X-polarized light, the light intensity PYa1 of the Y-polarized light included in the first detection signal e3, and the light intensity PXa2 of the X-polarized light, the light intensity PYa2 of the Y-polarized light included in the second detection signal e4. That is, Ls1 = PXa1 + PYa1 + PXa2 + PYa2.

[0105] The fault detection unit obtains the sum Ls2 of the light intensity PXc1 of the X-polarized light, the light intensity PYc1 of the Y-polarized light included in the first reference signal c1, and the light intensity PXc2 of the X-polarized light, the light intensity PYc2 of the Y-polarized light included in the second reference signal c2. That is, Ls2 = PXc1 + PYc1 + PXc2 + PYc2.

[0106] Then, the fault detection unit obtains the correlation degree P1 corresponding to the time t1 in the first correlation curve, that is, P1 = |Ls1| + |Ls2|.

[0107] By analogy, the fault detection unit obtains the correlation degree corresponding to the time t2, the correlation degree PN corresponding to the time tN, and the like in the first correlation curve.

[0108] In other examples, the fault detection unit can obtain two first correlation curves. In the two first correlation curves, the correlation degrees P1 corresponding to the time t1 are Ls1 and Ls2, respectively. By analogy, the correlation degrees corresponding to the time t2, the correlation degrees PN corresponding to the time tN, and the like in the two first correlation curves are obtained, respectively.

[0109] It should be noted that the description of the correlation calculation of the first detection signal e3, the second detection signal e4, the first detection signal e3, and the second detection signal e4 in the present embodiment is an optional example and is not limited. As long as the correlation between the detection signals and the reference signals corresponding to different times can be obtained.

[0110] In the example shown in FIG. 9, the correlation peak corresponding to the time tN in the first correlation curve is taken as an example. The correlation peak refers to a wave peak in the first correlation curve. If the fault detection unit detects the correlation peak in the first correlation curve, it indicates that the optical fiber connected between the first optical communication device and the second optical communication device has a fault. The reason why the optical fiber has a fault is explained below when the correlation peak exists in the first correlation curve:

[0111] If there is a fault point in the optical fiber (e.g. dirt, breakage, damage, bending, pressure, loose or misaligned optical fiber connector, etc.), the fault point will reflect the first detection light according to the first service light from the first optical communication device to the first optical communication device. The first detection light and the first service light have the same frequency and modulation mode, so there is a high correlation. The high correlation will present one or more correlation peaks in the first correlation curve. It can be understood that if the fault detection unit detects one or more correlation peaks in the first correlation curve, it is determined that there is a fault in the optical fiber.

[0112] The fault detection unit can also locate the specific position of the fault point in the optical fiber according to the position of the correlation peak in the first correlation curve.

[0113] The fault detection unit locates the position of the fault point in the optical fiber according to the following formula:

[0114] Distance = light speed * fault time period / 2. Wherein, the time period corresponding to the correlation peak in the first correlation curve is the fault time period (e.g. time tN shown in FIG. 9). The distance is the distance between the fault point and the first optical communication device in the optical fiber. For example, if the calculated distance is 10 meters (m), it means that the fault point is at a position 10 m away from the first optical communication device in the optical fiber.

[0115] The above examples take the time as the horizontal coordinate in the coordinate system where the first correlation curve is located. In other examples, the horizontal coordinate can also be the distance between the reflection point in the optical fiber for reflecting the first detection light and the first optical communication device.

[0116] Example 2

[0117] The fault detection unit in this example correlates the first reference signal c1, the second reference signal c2, the first detection signal e3, and the second detection signal e4 to obtain a second correlation curve. The first correlation curve in Example 1 reflects the correlation of the light intensity of the detection signal and the light intensity of the reference signal with time. The second correlation curve in this example reflects the correlation of the amplitude of the detection signal and the amplitude of the reference signal with time. The coordinate system where the second correlation curve is located has time as the horizontal coordinate and correlation degree as the vertical coordinate. The process of obtaining the second correlation curve by the fault detection unit can be referred to the process of obtaining the first correlation curve by the fault detection unit shown in Example 1, which is not described in detail. The fault detection based on the second correlation curve by the fault detection unit is described in Example 1, which is not described in detail.

[0118] Example 3

[0119] The fault detection unit shown in this example correlates the first reference signal c1, the second reference signal c2, the first detection signal e3, and the second detection signal e4 to obtain a third correlation curve. The first correlation curve in Example 1 reflects the correlation of the light intensity of the detection signal and the light intensity of the reference signal over time. The third correlation curve shown in this example reflects the correlation of the phase of the detection signal and the phase of the reference signal over time. Then, the coordinate system in which the third correlation curve is located has time as the horizontal coordinate and correlation degree as the vertical coordinate. The process by which the fault detection unit obtains the third correlation curve can be referred to the process by which the fault detection unit obtains the first correlation curve shown in the examples, and details are not repeated. The fault detection based on the third correlation curve by the fault detection unit is described in Example 1, and details are not repeated.

[0120] It should be noted that the description of the correlation curve type in this embodiment is an optional example and is not limited, as long as the correlation curve can reflect the correlation of the reference signal and the detection signal over time. For example, the correlation curve can also reflect the correlation of the polarization state of the reference signal and the polarization state of the detection signal over time.

[0121] In this embodiment, the fault detection unit can detect the fiber fault condition through any one of the above-mentioned Examples 1, 2, or 3. In other examples, the fault detection unit can detect the fiber fault condition through at least two of the above-mentioned Examples 1, 2, or 3. For example, the fault detection unit obtains the first correlation curve shown in Example 1 and the second correlation curve shown in Example 2, and the fault detection unit detects at least one correlation peak in the first correlation curve and the second correlation curve, and then determines that there is a fault in the fiber.

[0122] Step 305, the second optical communication device receives the second combined optical signal.

[0123] Step 306, the second optical communication device detects the fault condition of the optical fiber according to the detection signal and the reference signal.

[0124] The description of the execution process of steps 305 to 306 shown in this embodiment can be referred to the description of steps 303 to 304, and details are not repeated.

[0125] In the prior art, if fault detection is needed, the OTDR injects optical pulses into the optical fiber to perform fault detection. The technical defects of the OTDR performing fault detection are as follows: a) the optical pulses emitted by the OTDR have a large optical power, which can cause a large degree of interference to the service light emitted by the first optical communication device. In order to suppress the interference of the optical pulses to the service light, the transmission of the service light is suspended during the period in which the OTDR injects the optical pulses into the optical fiber, thereby reducing the transmission efficiency of the service light; b) the optical pulses have a detection period, and in a detection period with a short duration, the light intensity suddenly increases, and between two adjacent detection periods, the light intensity rapidly decreases. In the duration of the adjacent detection periods, the fault position in the optical fiber cannot be detected and located, thereby increasing the time delay of fault detection; c) the wavelength of the optical pulses emitted by the OTDR is different from the wavelength of the service light emitted by the optical communication device. Therefore, the optical pulses need to occupy bandwidth resources, thereby reducing the bandwidth resources that can be occupied by the optical communication device to send services, and reducing the utilization rate of the bandwidth resources; d) the optical communication device needs to be connected to a separate OTDR, thereby increasing the hardware complexity.

[0126] The method shown in the embodiment avoids the large optical power of the optical pulses interfering with the service light, thereby improving the signal quality of the service light. The method shown in the embodiment directly performs fault detection through the service light and the detection light reflected by the optical fiber according to the service light. Therefore, the transmission of the service light does not need to be interrupted during the fault detection process, thereby improving the transmission efficiency of the service light. The service light sent by the optical communication device shown in the embodiment is a modulated optical signal, rather than an optical pulse. Therefore, the time delay of fault detection is reduced, and real-time detection of the fault condition in the optical fiber can be achieved. The detection light shown in the embodiment does not occupy the bandwidth resources occupied by the service light. Therefore, the transmission of the detection light and the transmission of the service light are isolated from each other, thereby effectively suppressing the interference of the transmission of the detection light to the service light, and improving the utilization rate of the bandwidth resources. The process shown in the embodiment does not need to increase the hardware (such as an OTDR device) of the optical communication device, thereby reducing the cost of fault detection. Moreover, the method shown in the embodiment achieves fault detection and fault positioning by correlating the detection signal and the reference signal, thereby improving the accuracy of fault detection.

[0127] In the embodiment shown in FIG. 3, the detection of the fault condition is performed by the optical module. In the embodiment shown in the present application, the detection of the fiber fault condition is performed by the device board. In combination with FIG. 10, which is a structural diagram of a second embodiment of the optical communication device provided in the present application. Specifically, the optical communication device shown in FIG. 10 can be the first optical communication device or the second optical communication device shown in FIG. 1. Taking the optical communication device shown in FIG. 10 as the first optical communication device as an example, the first optical communication device includes a device board 1000 and an optical module 1001 connected to the device board 1000. The number of the optical module 1001 included in the first optical communication device is not limited in the embodiment, and the connection relationship between the optical module 1001 and the device board 1000 is described in combination with the corresponding description of FIG. 2, and will not be repeated here. The device board 1000 includes a first controller 1003 and a second controller 1004. The types of the first controller 1003 and the second controller 1004 are described in combination with the corresponding description of the first processor and the second processor of FIG. 2, and will not be repeated here. The first controller 1003 specifically includes a first control unit 1011 and a first control unit 1012, and further includes a multiplexer 1013 connected to the first control unit 1011 and the first control unit 1012, respectively. The device board 1000 further includes a DAC 1014 connected to the multiplexer. The second controller 1004 specifically includes a second control unit 1021, a second control unit 1022, and a fault detection unit 1023, and further includes a demultiplexer 1024 connected to the second control unit 1021, the second control unit 1022, and the fault detection unit 1023, respectively. The device board 1000 further includes an ADC 1025 connected to the demultiplexer 1024. The fault detection unit 1023 is described in combination with the corresponding description of FIG. 2, and will not be repeated here. In the embodiment shown in the present application, the first control unit 1011 and the first control unit 1012 are connected to the fault detection unit 1023, respectively. In other examples, the fault detection unit 1023 can also be in a separate structure from the second controller 1004.

[0128] The optical module 1001 comprises a TX channel, an RX channel, a separation module 1051 and a laser 1050. The TX channel specifically comprises a first ADC 1031, a first processor 1030, a first DAC 1036 and an optical modulator 1037 connected in sequence. The first ADC 1031 is connected to the DAC 1014 through a wire. The wire can also be referred to as a trace, a circuit trace, etc. The first processor 1030 comprises a demultiplexer 1032 connected to the first ADC 1031, a multiplexer connected to the first DAC 1036, and a plurality of first processing units connected between the demultiplexer 1032 and the multiplexer 1035, such as a first processing unit 1033 and a first processing unit 1034. For specific description of the TX channel, please refer to the corresponding description in FIG. 2, which will not be repeated here. The RX channel specifically comprises a second DAC 1041, a second processor 1040, a second ADC 1045 and an optical demodulator 1046 connected in sequence. The second DAC 1041 is connected to the ADC 1025 through a wire. The second processor 1040 comprises a multiplexer 1047 connected to the second ADC 1045, a demultiplexer 1044 connected to the second ADC 1045, and a plurality of second processing units connected between the multiplexer 1047 and the demultiplexer 1044, such as a second processing unit 1042 and a second processing unit 1043. As shown in FIG. 2 and FIG. 10, the optical module shown in FIG. 10 does not need to be provided with a fault detection unit, but the fault detection unit is provided on the device single board. The second processor 1040 shown in FIG. 10 comprises one or more fault processing units 1060 connected between the multiplexer 1047 and the demultiplexer 1044. Each second processing unit is used for digital signal processing of signals occupying the second waveband, and each fault processing unit is used for digital signal processing of signals occupying the first waveband. For specific description of the first waveband and the second waveband, please refer to the corresponding description in FIG. 3, which will not be repeated here. The laser 1050 is connected to the optical modulator 1037 and the optical demodulator 1046 respectively, and the optical modulator 1037 and the optical demodulator 1046 are further connected to the separation module 1051. The separation module 1051 is further connected to a BiDi supporting optical fiber 1052. For specific description, please refer to the corresponding description in FIG. 2, which will not be repeated here.

[0129] Based on the structure of the optical communication device shown in FIG. 10, the method for detecting faults provided by the embodiment of the present application is explained in combination with FIG. 11. Based on the method shown in the embodiment, the fault condition of the optical fiber connected between the first optical communication device and the second optical communication device can be detected. FIG. 11 is a step flow chart of a second embodiment of the fault detection method provided by the present application.

[0130] In step 1101, the device single board of the first optical communication device sends a first service signal to the optical module.

[0131] Specifically, if the optical communication device shown in FIG. 10 is the first optical communication device, in the first controller of the device board, different first control units transmit a first service signal to the multiplexer respectively. The first control unit transmits a description of the first service signal to the multiplexer. Please refer to the description of the first processing unit transmitting the description of the first service signal to the multiplexer shown in step 301 of FIG. 3. Details are not described herein. It can be understood that the first control unit 1011 and the first control unit 1012 send the first service signal processed by the digital signal processing to the multiplexer 1013. The multiplexer 1013 multiplexes the first service signal to obtain a multiplexed signal. The multiplexer sends the multiplexed signal to the DAC 1014. The DAC 1014 performs digital-to-analog conversion on the multiplexed signal to obtain an analog signal.

[0132] Step 1102: The optical module of the first optical communication device sends the first service light to the second optical communication device through the optical fiber.

[0133] The optical module of the first optical communication device obtains the first service light according to the analog signal from the device board, and sends the first service light to the second optical communication device through the optical fiber 1052. Please refer to the corresponding step 301 of FIG. 3 for details.

[0134] Step 1103: The device board of the second optical communication device sends the second service signal to the optical module.

[0135] Step 1104: The optical module of the second optical communication device sends the second service light to the first optical communication device through the optical fiber.

[0136] The description of the process of the second optical communication device sending the second service light to the first optical communication device shown in steps 1103 to 1104 is not described herein. Please refer to the description of the process of the first optical communication device sending the first service light to the second optical communication device shown in steps 1101 to 1102. Details are not described herein. The description of the second service light is not described herein. Please refer to the description of the second service light shown in step 302 of FIG. 3. Details are not described herein.

[0137] Step 1105: The optical module of the first optical communication device receives the first combined light signal.

[0138] Step 1106: The optical module of the first optical communication device sends the first combined signal to the device board.

[0139] The process of the optical module receiving the first combined light signal is described as follows:

[0140] Firstly, the separation module 1051 receives the first combined optical signal from the optical fiber, and sends the first combined optical signal to the optical demodulator 1046. The first combined optical signal is described in detail in step 303 of FIG. 3, and will not be repeated here.

[0141] Secondly, the optical demodulator 1046 demodulates the first combined optical signal to obtain an analog signal. The demodulation process is described in detail in step 304 of FIG. 3, and will not be repeated here. The optical demodulator 1046 sends the analog signal to the second ADC 1045. The second ADC 1045 converts the analog signal into a digital signal. The second ADC 1045 sends the digital signal to the demultiplexer 1044. The conversion process of the second ADC 1045 is described in detail in step 304 of FIG. 3, and will not be repeated here. The demultiplexer 1044 demultiplexes the digital signal according to the wavelength band to obtain a second service signal d7 occupying the wavelength band b3, a second service signal d8 occupying the wavelength band b4, a first detection signal e1 occupying the wavelength band b1, and a second detection signal e2 occupying the wavelength band b2. The second service signal d7, the second service signal d8, the first detection signal e1, and the second detection signal e2 are described in detail in step 304 of FIG. 3, and will not be repeated here. The demultiplexer 1044 sends the second service signal d7 to the second processing unit 1042, sends the second service signal d8 to the second processing unit 1043, and sends the first detection signal e1 and the second detection signal e2 to the fault processing unit 1060. Each of the second processing unit and the fault processing unit processes the received signal. The processing process is described in detail in step 304 of FIG. 3, and will not be repeated here. It can be understood that the fault processing unit 1060 in the embodiment only processes the digital signal, and does not detect the fault of the optical fiber. The multiplexer 1047 multiplexes the second service signal, the first detection signal, and the second detection signal after digital signal processing to obtain a multiplexed digital signal. The multiplexer 1047 sends the multiplexed digital signal to the second DAC 1041. The second DAC 1041 converts the multiplexed digital signal into an analog signal to obtain a first combined signal, and sends the first combined signal through a wire connected between the second DAC 1041 and the device board. It can be understood that the first combined signal sent by the optical module to the device board in the embodiment includes the first detection signal, the second detection signal, and the second service signal.

[0142] In step 1107, the device board of the first optical communication device detects the fault of the optical fiber according to the first combined signal.

[0143] The analog-digital converter 1025 of the device single board receives the first combined signal, and performs analog-digital conversion to obtain a combined digital signal, and sends the combined digital signal to the demultiplexer 1024. The demultiplexer 1024 demultiplexes the second service signal occupying the wave band b3, the second service signal occupying the wave band b4, the first detection signal occupying the wave band b1, and the second detection signal occupying the wave band b2, and the description of the demultiplexing process of the demultiplexer 1024 can be referred to the description of the demultiplexing of the demultiplexer included in the optical module, and will not be described in detail. The demultiplexer 1024 sends the second service signal occupying the wave band b3 to the second control unit 1021, so that the second control unit 1021 processes the second service signal. The demultiplexer 1024 sends the second service signal occupying the wave band b4 to the second control unit 1022, so that the second control unit 1022 processes the second service signal. The demultiplexer 1024 sends the first detection signal occupying the wave band b1 and the second detection signal occupying the wave band b2 to the fault detection unit 1023, so that the fault detection unit 1023 detects the fault condition of the optical fiber according to the first detection signal and the second detection signal. The specific detection process is described below:

[0144] Firstly, the fault detection unit 1023 obtains the reference signal.

[0145] The first control unit 1011 processes the first service signal occupying the wave band b1 to obtain a first reference signal, and sends the first reference signal to the fault detection unit 1023. Similarly, the first control unit 1012 sends a second reference signal to the fault detection unit 1023, and the description of the first reference signal and the second reference signal can be referred to the corresponding step 304 shown in FIG. 3, and will not be described in detail.

[0146] Secondly, the fault detection unit detects the fault condition of the optical fiber according to the first reference signal, the second reference signal, the first detection signal and the second detection signal, and the specific detection process is described below.

[0147] Step 1108, the optical module of the second optical communication device receives the second combined optical signal.

[0148] Step 1109, the optical module of the second optical communication device sends the second combined signal to the device single board.

[0149] Step 1110, the device single board of the second optical communication device detects the fault condition of the optical fiber according to the second combined signal.

[0150] The steps 1108 to 1110 shown in this embodiment perform the process, please refer to the corresponding steps 1105 to 1107 shown in FIG. 11, and details are not described herein.

[0151] By using the method shown in this embodiment, the detection of the fiber fault condition is performed by the device single board, which reduces the power consumption of the optical module, thereby helping to reduce the heat dissipation difficulty of the optical module, improving the reliability of the optical module, and further improving the signal quality of the optical module transceiving light signals.

[0152] FIG. 12 is a step flow chart of a third embodiment of the fault detection method provided in the present application. The detection method shown in FIG. 12, the optical communication device can switch the detection mode according to the service light transmission condition in the optical fiber.

[0153] Step 1201, the first optical communication device sends first service light to the second optical communication device through the optical fiber.

[0154] Step 1202, the second optical communication device sends second service light to the first optical communication device through the optical fiber.

[0155] Step 1203, the first optical communication device receives the first combined light signal.

[0156] The steps 1201 to 1203 shown in this embodiment perform the process, please refer to the corresponding steps 301 to 303 shown in FIG. 3, and details are not described herein.

[0157] Step 1204, the first optical communication device detects whether the optical power corresponding to the second waveband is less than or equal to the power threshold value, if not, step 1205 is performed, if yes, step 1206 is performed.

[0158] In this embodiment, the separation module receives the first combined light signal and sends the optical demodulator, and the optical demodulator can detect whether the optical power corresponding to the second waveband is less than or equal to the power threshold value. The optical signal occupying the second waveband is the service signal sent by the second optical communication device to the first optical communication device, and the description of the optical signal occupying the second waveband is described in the corresponding embodiment of FIG. 3, and details are not described herein. The size of the power threshold value is not limited in this embodiment. If the first optical communication device determines that the optical power corresponding to the second waveband is less than or equal to the power threshold value, it means that the service light occupying the second waveband emitted by the second optical communication device has a large loss during the transmission through the optical fiber. The reason for the large loss during the transmission of the second service light may be that the optical fiber has been broken.

[0159] Step 1205, the first optical communication device detects the fault condition of the optical fiber according to the first combined light signal.

[0160] The step 1205 shown in this embodiment performs the process. For details, please refer to the corresponding step 304 shown in FIG. 3.

[0161] The step 1206 is to generate a pulse signal by the first optical communication device, and convert the pulse signal into an optical pulse.

[0162] If the optical power corresponding to the second waveband is less than or equal to the power threshold, the power detection module sends an interrupt indication information to the first processor included in the TX channel of the optical module, and the interrupt indication information is used to indicate that the optical power corresponding to the second waveband is less than or equal to the power threshold. For another example, the power detection module can directly send the detected optical power corresponding to the second waveband to the first processor, and the first processor determines whether the optical power corresponding to the second waveband is less than or equal to the power threshold. If the first processor determines that the optical power corresponding to the second waveband is less than or equal to the power threshold, it means that the optical fiber has a higher possibility of interruption and other faults. In order to further accurately detect the fault condition of the optical fiber, the first processor generates a pulse signal. The first processor shown in this embodiment includes a plurality of first processing units, and the first processor can generate the pulse signal through one or more first processing units. The pulse signal is transmitted to the optical modulator through the multiplexer and the first digital-to-analog converter. For details of the transmission process, please refer to the process of transmitting the first service signal to the optical modulator. The optical modulator receives the pulse signal, and modulates the pulse signal according to the laser signal from the laser to obtain an optical pulse. For details of the process of modulating the pulse signal by the optical modulator, please refer to the process of modulating the service signal by the optical modulator shown in FIG. 3. In this embodiment, the optical pulse occupies the first waveband as an example. Therefore, another laser is not needed for the optical pulse, but the laser for transmitting the first service signal is multiplexed, which reduces the number of hardware of the first optical communication device.

[0163] In this embodiment, the optical module generates the pulse signal as an example. In other examples, the pulse signal can be generated by a device single board of the first optical network device. Specifically, the device single board receives the interrupt indication information from the optical module. The device single board determines that the optical power corresponding to the second waveband is less than or equal to the power threshold according to the interrupt indication information. Then, the first controller of the device single board generates the pulse signal according to the interrupt indication information. For the description of the device generating the pulse signal, please refer to the description of the optical module generating the pulse signal, and details are not described herein. The device single board sends the pulse signal to the TX channel of the optical module. The TX channel of the optical module converts the pulse signal into an optical pulse. For the description of the process of the optical module converting the service signal from the device single board into the service light, please refer to the description of the process, and details are not described herein. For example, the first control unit (please refer to the corresponding description in FIG. 10) included in the first controller of the device single board generates the pulse signal according to the interrupt indication information. The pulse signal is transmitted to the first processing unit of the first processor of the optical module. The first processing unit performs digital signal processing on the pulse signal and sends it to the optical modulator. The optical modulator modulates the pulse signal to obtain an optical pulse.

[0164] Step 1207: The first optical communication device sends an optical pulse to the optical fiber.

[0165] Step 1208: The first optical communication device receives K reflected lights.

[0166] In this embodiment, when the first optical communication device sends an optical pulse to the optical fiber, the reflection points in the optical fiber will reflect reflected lights to the first optical communication device according to the optical pulse. The number of the reflected lights received by the first optical communication device is not limited in this embodiment, that is, K is any integer greater than or equal to 1.

[0167] Step 1209: The first optical communication device detects the fault condition of the optical fiber according to the K reflected lights.

[0168] Specifically, the separation module of the first optical communication device receives the K reflected lights and sends the K reflected lights to the optical demodulator. The optical demodulator demodulates the K reflected lights to obtain K reflected signals. For the description of the process of the optical demodulator demodulating the reflected light, please refer to the description of the process of the optical demodulator demodulating the second service light in FIG. 3, and details are not described herein. The optical demodulator sends the K detection signals to the fault detection unit. For the description of the process of the optical demodulator sending the detection signals to the fault detection unit, please refer to the description of the process of the optical demodulator sending the detection signals to the fault detection unit in FIG. 3, and details are not described herein.

[0169] The fault detection unit detects whether the optical fiber has a breakpoint, fiber attenuation, attenuation of a fiber connector, and structural loss (e.g., fiber bending, extrusion, etc.) of the optical fiber based on the OTDR technology according to the K reflected signals. The fault detection unit can further analyze the cause of the optical fiber fault based on the detection result of the K reflected signals. For example, according to the attenuation pattern, blockage pattern, etc. in the detection result, it can be determined whether the optical fiber has a serious damage, end fault, light emission obstruction, etc. The fault detection unit detects the fault condition of the optical fiber through the K reflected signals, can accurately and quickly locate the fault type and fault position of the optical fiber, reduces the difficulty of optical fiber operation and maintenance, and improves the operation and maintenance efficiency.

[0170] Step 1210, the second optical communication device receives the second combined optical signal.

[0171] Step 1211, the second optical communication device detects whether the optical power corresponding to the first wave band is less than or equal to the power threshold value, if not, step 1212 is executed, if yes, step 1213 is executed.

[0172] Step 1212, the second optical communication device detects the fault condition of the optical fiber according to the second combined optical signal.

[0173] Step 1213, the second optical communication device generates a pulse signal and converts the pulse signal into an optical pulse.

[0174] Step 1214, the second optical communication device sends the optical pulse to the optical fiber.

[0175] Step 1215, the second optical communication device receives K reflected lights.

[0176] Step 1216, the second optical communication device detects the fault condition of the optical fiber according to the K reflected lights.

[0177] For the description of the execution process of steps 1210 to 1216 shown in the embodiment, please refer to steps 1203 to 1209 shown in the embodiment, and details are not repeated.

[0178] By using the method shown in the embodiment, when the optical communication device detects that the optical fiber may have an interruption, etc., the mode of detecting the fault condition of the optical fiber is switched, so that the optical communication device sends an optical pulse to the optical fiber, and the optical communication device receives the reflected light reflected by the optical fiber. The optical communication device detects the fault condition of the optical fiber based on the OTDR technology according to the reflected light, improves the efficiency and accuracy of the detection of the fault condition of the optical fiber, reduces the difficulty of the operation and maintenance of the optical fiber, and improves the operation and maintenance efficiency.

[0179] FIG. 13 is a structural diagram of a third embodiment of the optical communication device provided in the present application. The optical communication device 1300 shown in the embodiment specifically comprises a sending module 1301, a processing module 1302 and a receiving module 1303 connected in sequence.

[0180] For example, if the optical communication device 1300 is a first optical communication device, if used to execute the embodiment corresponding to FIG. 5, the sending module 1301 is used to execute step 301, the receiving module 1303 is used to execute step 303, and the processing module 1302 is used to execute step 304. If used to execute the embodiment corresponding to FIG. 11, the sending module 1301 is used to execute step 1101, step 1102 and step 1106, the receiving module 1303 is used to execute step 1105, and the processing module 1302 is used to execute step 1107. If used to execute the embodiment corresponding to FIG. 12, the sending module 1301 is used to execute step 1201 and step 1207, the receiving module 1303 is used to execute step 1203 and step 1208, and the processing module 1302 is used to execute step 1204, step 1205, step 1206 and step 1209.

[0181] For another example, if the optical communication device 1300 is a second optical communication device, if used to execute the embodiment corresponding to FIG. 5, the sending module 1301 is used to execute step 302, the receiving module 1303 is used to execute step 305, and the processing module 1302 is used to execute step 306. If used to execute the embodiment corresponding to FIG. 11, the sending module 1301 is used to execute step 1104, step 1103 and step 1109, the receiving module 1303 is used to execute step 1108, and the processing module 1302 is used to execute step 1110. If used to execute the embodiment corresponding to FIG. 12, the sending module 1301 is used to execute step 1202 and step 1214, the receiving module 1303 is used to execute step 1210 and step 1215, and the processing module 1302 is used to execute step 1211, step 1212, step 1213 and step 1216.

[0182] The embodiment of the present application provides an optical communication device. The structure of the optical communication device is described with reference to FIG. 2 and FIG. 10, and details are not described herein.

[0183] The embodiment of the present application provides an optical module. The structure of the optical module is described with reference to the description of the optical module corresponding to FIG. 2 or FIG. 10, and details are not described herein.

[0184] The embodiment of the present application further provides a device single board. The description of the device single board is described with reference to the description of the device single board corresponding to FIG. 2 or FIG. 10, and details are not described herein.

[0185] The embodiment of the present application further provides an optical network, and the structure of the optical network is shown in Figure 1, and the specific description is omitted. The optical communication device included in the optical network is shown in Figure 2 and Figure 10, and the specific description is omitted.

[0186] The embodiment of the present application further provides a computer readable storage medium, wherein computer instructions are stored in the computer readable storage medium, and the computer instructions instruct a computer device to execute the embodiment corresponding to Figure 3, Figure 5 and Figure 12.

[0187] The embodiment of the present application further provides a chip, wherein the chip includes a programmable logic circuit and / or program instructions, and when the chip is running, the chip is used for executing the embodiment corresponding to Figure 3, Figure 5 and Figure 12.

[0188] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiments, and details are not repeated here.

[0189] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0190] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0191] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit.

Claims

1. A method for fault detection, characterized in that, The method includes: The first optical communication device sends a first service light to the second optical communication device through an optical fiber, and the first service light occupies the first band. The first optical communication device receives a combined optical signal through the optical fiber. The combined optical signal includes a detection light reflected by the optical fiber and a second service light from the second optical communication device. The detection light occupies the first band, and the second service light occupies the second band. The first band is different from the second band. The first optical communication device detects the fault status of the optical fiber based on the merged optical signal.

2. The method according to claim 1, characterized in that, The first optical communication device detects the fault status of the optical fiber based on the merged optical signal, including: The first optical communication device detects the fault status of the optical fiber based on the detection signal and the reference signal. The detection signal is converted from the detection light, and the reference signal is the same as the service signal. The first service light is converted from the service signal.

3. The method according to claim 2, characterized in that, The first optical communication device includes an optical module and a device board. The first optical communication device transmits a first service light to the second optical communication device through an optical fiber, including: The device board sends the service signal to the optical module; The optical module converts the service signal to obtain the first service light; Before the first optical communication device detects the fault condition of the optical fiber based on the detection signal and the reference signal, the method further includes: The optical module obtains the reference signal based on the service signal; The first optical communication device detects fault conditions in the optical fiber based on detection signals and reference signals, including: The optical module detects the fault status of the optical fiber based on the detection signal and the reference signal.

4. The method according to claim 2, characterized in that, The first optical communication device includes an optical module and a device board. The first optical communication device transmits a first service light to the second optical communication device through an optical fiber, including: The device board sends the service signal to the optical module; The optical module converts the service signal to obtain the first service light; Before the first optical communication device detects the fault condition of the optical fiber based on the detection signal and the reference signal, the method further includes: The device board obtains the reference signal based on the service signal; The device board receives the detection signal from the optical module; The first optical communication device detects fault conditions in the optical fiber based on detection signals and reference signals, including: The device board detects the fault status of the optical fiber based on the detection signal and the reference signal.

5. The method according to any one of claims 2 to 4, characterized in that, The first optical communication device detects fault conditions in the optical fiber based on detection signals and reference signals, including: The first optical communication device correlates the detection signal and the reference signal to obtain a correlation curve, which represents the correlation between the detection signal and the reference signal over time. If at least one correlation peak exists in the correlation curve, the first optical communication device detects at least one fault in the optical fiber.

6. The method according to claim 5, characterized in that, The correlation curve represents at least one of the following: The correlation between the light intensity of the detected signal and the light intensity of the reference signal over time; the correlation between the amplitude of the detected signal and the amplitude of the reference signal over time; the correlation between the phase of the detected signal and the phase of the reference signal over time; and the correlation between the polarization state of the detected signal and the polarization state of the reference signal over time.

7. The method according to claim 5 or 6, characterized in that, The first optical communication device also detects at least one fault in the optical fiber, further including: The first optical communication device detects that a fault exists at the location corresponding to the fault time period in the optical fiber, wherein the fault time period is the time period corresponding to the correlation peak in the correlation curve.

8. The method according to any one of claims 1 to 7, characterized in that, After the first optical communication device transmits the first service light to the second optical communication device via optical fiber, the method further includes: The first optical communication device sends an optical pulse to the optical fiber; The first optical communication device receives K reflected beams of light reflected by the optical fiber, where K is any integer greater than or equal to 1; The first optical communication device detects the fault status of the optical fiber based on the K reflected lights.

9. The method according to claim 8, characterized in that, The first optical communication device includes an optical module and a device board. The first optical communication device sends optical pulses to the optical fiber, including: If the optical module detects that the optical power corresponding to the second band is less than or equal to the power threshold, the optical module sends the optical pulse to the optical fiber.

10. The method according to claim 8 or 9, characterized in that, The first optical communication device sends optical pulses to the optical fiber, including: The optical module generates a pulse signal and converts the pulse signal into an optical pulse.

11. The method according to claim 9, characterized in that, Before the first optical communication device sends an optical pulse to the optical fiber, the method further includes: The device board receives interruption indication information from the optical module, and the interruption indication information is used to indicate that the optical power corresponding to the second band is less than or equal to the power threshold. The device board sends a pulse signal to the optical module according to the interruption indication information; The optical module converts the pulse signal into the optical pulse.

12. The method according to any one of claims 8 to 11, characterized in that, The light pulse occupies the first wavelength band.

13. An optical communication device, characterized in that, This includes equipment boards and optical modules; The device board is used to send service signals to the optical module; The optical module is used for: The service signal is converted to obtain the first service light; The first service light is transmitted to the second optical communication device via optical fiber, and the first service light occupies the first band. The optical fiber receives a combined optical signal, which includes a detection light reflected by the optical fiber and a second service light from the second optical communication device. The detection light occupies the first band, and the second service light occupies the second band. The first band is different from the second band. The combined optical signal is used to detect the fault status of the optical fiber.

14. The optical communication device according to claim 13, characterized in that, The optical module is also used for: A reference signal is obtained based on the service signal, and the reference signal is the same as the service signal; The detection light is converted to obtain a detection signal; The fault condition of the optical fiber is detected based on the detection signal and the reference signal.

15. The optical communication device according to claim 14, characterized in that, The optical module is also used in the process of detecting faults in the optical fiber based on the detection signal and the reference signal, specifically for: The detected signal and the reference signal are correlated to obtain a correlation curve, which represents the correlation between the detected signal and the reference signal over time. If at least one correlation peak exists in the correlation curve, the first optical communication device detects at least one fault in the optical fiber.

16. The optical communication device according to claim 13, characterized in that, The device board is also used to obtain a reference signal based on the service signal, wherein the reference signal is the same as the service signal; The optical module is also used to convert the detection light to obtain a detection signal and send the detection signal to the device board. The device board is also used to detect the fault status of the optical fiber based on the detection signal and the reference signal.

17. The optical communication device according to claim 16, characterized in that, The device board is also used in the process of detecting the fault status of the optical fiber based on the detection signal and the reference signal, specifically for: The detected signal and the reference signal are correlated to obtain a correlation curve, which represents the correlation between the detected signal and the reference signal over time. If at least one correlation peak exists in the correlation curve, the first optical communication device detects at least one fault in the optical fiber.

18. The optical communication device according to any one of claims 13 to 17, characterized in that, The optical module is also used for: Send optical pulses to the optical fiber; The system receives K reflected light rays reflected by the optical fiber, where K is any integer greater than or equal to 1, and the K reflected light rays are used to detect faults in the optical fiber.

19. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that instruct a computer device to perform the method according to any one of claims 1 to 12.

20. A chip, characterized in that, The chip includes programmable logic circuitry and / or program instructions, which, when the chip is running, are used to execute the method described in any one of claims 1 to 12.

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