CN116865848A

CN116865848A - Optical link detection method and device

Info

Publication number: CN116865848A
Application number: CN202210313746.2A
Authority: CN
Inventors: 朱庆明; 郑栋升; 娄延年
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-10-10
Also published as: WO2023185453A1

Abstract

The embodiment of the application provides an optical link detection method and device. In the method, an optical link detection device performs photoelectric conversion on a first optical signal and a second optical signal to respectively obtain information of the first optical signal and information of the second optical signal, wherein the first optical signal is an optical signal carrying service data from a first optical module, and the second optical signal is an optical signal obtained by reflecting the first optical signal through an optical fiber link or an optical signal obtained by reflecting the first optical signal through the optical fiber link and the second optical module. And determining whether the optical link has a fault according to the information of the first optical signal or according to the information of the first optical signal and the information of the second optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module. It can be seen that the optical link detection means determines whether there is a failure in the optical link based on the optical signal carrying the traffic data, and is capable of detecting the optical link during traffic communication between the first optical module and the second optical module.

Description

Optical link detection method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting an optical link.

Background

In mobile communication networks, there are networks based on optical fiber communication, such as a fronthaul optical network. The forward optical network refers to a communication network based on optical fibers between a baseband unit (BBU) and a remote radio unit (remote radio unit, RRU) in a radio access network (radio access network, RAN), or refers to a communication network based on optical fibers between a BBU and an active antenna unit (active antenna unit, AAU) in a RAN.

In a network based on fiber optic communications, an optical link comprising: an optical module for transmitting an optical signal in a transmitting end, an optical module for receiving the optical signal in a receiving end, and an optical fiber connecting the two. If any position in the optical link fails, the quality of the optical signal transmitted between the transmitting end and the receiving end may be affected, and the network quality may be affected. How to detect an optical link is then a challenge.

Disclosure of Invention

The embodiment of the application provides an optical link detection method and device, which can detect whether an optical link fails or not.

In a first aspect, an embodiment of the present application provides an optical link detection apparatus, including a first optical detector, a second optical detector, and a signal processor. The first optical detector is used for carrying out photoelectric conversion on a first optical signal to obtain information of the first optical signal, and outputting the information of the first optical signal to the signal processor, wherein the first optical signal is an optical signal carrying service data from the first optical module. The second optical detector is used for carrying out photoelectric conversion on the second optical signal to obtain information of the second optical signal, and outputting the information of the second optical signal to the signal processor, wherein the second optical signal is an optical signal obtained by reflecting the first optical signal through an optical fiber link or an optical signal obtained by reflecting the first optical signal through the optical fiber link and the second optical module. The signal processor is used for determining whether the optical link has faults according to the information of the first optical signal or the information of the first optical signal and the information of the second optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module.

Therefore, the optical link detection device determines whether the optical link has faults or not based on the optical signals carrying the service data, and can realize the optical link detection in the process of carrying out service communication between the first optical module and the second optical module, thereby realizing the on-line detection. In addition, the optical link detection device does not comprise a light source, and the first light detector, the second light detector and the signal processor in the optical link detection device can be miniaturized, so that the optical link detection device can be miniaturized.

In an alternative embodiment, the optical link detection device further comprises a wavelength gate. The wavelength gate is used for determining a first optical signal from a third optical signal according to the first wavelength and outputting the first optical signal to the first optical detector, wherein the third optical signal comprises the first optical signal. The wavelength gating device is further used for determining a second optical signal from fourth optical signals according to the first wavelength and outputting the second optical signal to the second optical detector, wherein the fourth optical signal comprises the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through an optical fiber link or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module for receiving the third optical signal.

Optionally, the optical link detection device further includes an optical add/drop multiplexer having an add/drop multiplexing structure. The optical add/drop multiplexer is used for acquiring a third optical signal and a fourth optical signal and outputting the third optical signal and the fourth optical signal to the wavelength gate. In this embodiment, the third optical signal obtained based on the add/drop multiplexing structure is a part of the optical signals carrying the service data transmitted by the optical fiber link, where the part of the optical signals are used for optical link detection by the optical link detection device, and the rest of the optical signals carrying the service data transmitted by the optical fiber link can be normally transmitted to the optical module receiving the optical signals, so that normal service communication between the optical modules receiving and transmitting the optical signals is ensured. In addition, this embodiment also realizes that the third optical signal and the fourth optical signal are acquired with one device, without having to acquire the third optical signal and the fourth optical signal by two devices, respectively.

In an alternative embodiment, the optical link detection device further comprises a microresonator. The microresonator is configured to determine a first optical signal from a third optical signal based on the first wavelength and output the first optical signal to the first photodetector, wherein the third optical signal includes the first optical signal. The micro resonator is further configured to determine a second optical signal from a fourth optical signal according to the first wavelength, and output the second optical signal to the second optical detector, where the fourth optical signal includes the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through the optical fiber link, or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module that receives the third optical signal.

Optionally, the microresonator has an add/drop multiplexing structure; the microresonator is also used to acquire a third optical signal and a fourth optical signal.

In an alternative embodiment, the signal processor determines whether the optical link has a fault according to the information of the first optical signal, specifically: and when the average power corresponding to the information of the first optical signal is smaller than a first value, determining that the optical link has a fault, wherein the first value is a power threshold value of the first optical signal.

Optionally, if the average power corresponding to the information of the first optical signal is smaller than the first value, it is determined that a fault exists in the first optical module in the optical link, or it is determined that a fault exists in an optical fiber link connecting the first optical module and the optical link detection device.

In an alternative embodiment, the signal processor determines whether the optical link has a fault according to the information of the first optical signal and the information of the second optical signal, specifically: and calculating a cross-correlation function of the amplitude information of the first optical signal subjected to photoelectric conversion and the amplitude information of the second optical signal subjected to photoelectric conversion to obtain one or more cross-correlation coefficients. If there is a cross correlation coefficient of the one or more cross correlation coefficients that is greater than a second value, the second value being an amplitude threshold determined based on noise in the first optical signal and noise in the second optical signal, determining that the optical link is faulty.

Alternatively, if there is a cross correlation coefficient greater than the second value in the one or more cross correlation coefficients, it is determined that there is a failure in the second optical module in the optical link, or it is determined that there is a failure in the optical fiber link connecting the second optical module and the optical link detection device.

In an alternative embodiment, the signal processor is further configured to determine the location of the fault point on the optical link based on a time instant corresponding to each of the one or more cross-correlation coefficients that is greater than the second value.

In an alternative embodiment, the signal processor is further configured to determine the reflection loss at the point of failure on the optical link based on a value of each of the one or more cross-correlation coefficients that is greater than the second value.

In a second aspect, an embodiment of the present application provides an optical link detection apparatus, including a first optical detector, a second optical detector, and a signal processor. The first optical detector is used for carrying out photoelectric conversion on a fifth optical signal to obtain information of the fifth optical signal, and outputting the information of the fifth optical signal to the second signal processor, wherein the fifth optical signal is obtained by modulating a first optical signal, and the first optical signal is an optical signal carrying service data from the first optical module. The second optical detector is used for performing photoelectric conversion on the sixth optical signal to obtain information of the sixth optical signal, and outputting the information of the sixth optical signal to the second signal processor, wherein the sixth optical signal is an optical signal obtained by reflecting the fifth optical signal through an optical fiber link or an optical signal obtained by reflecting the fifth optical signal through the optical fiber link and the second optical module. The signal processor is used for determining whether the optical link has faults according to the information of the fifth optical signal or the information of the sixth optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module.

It can be seen that the optical link detection device determines whether there is a fault in the optical link based on the optical signal modulated by the optical signal carrying the service data, and the optical link detection device has higher sensitivity and has stronger capability of identifying a micro fault (a fault with smaller loss). In addition, the optical link detection device does not comprise a light source, and the first light detector, the second light detector and the signal processor in the optical link detection device can be miniaturized, so that the optical link detection device can be miniaturized.

In an alternative embodiment, the optical link detection device further comprises a wavelength gate. The wavelength gating device is used for determining a fifth optical signal from the seventh optical signal according to the first wavelength and outputting the fifth optical signal to the first optical detector, wherein the seventh optical signal comprises the fifth optical signal. The wavelength gating device is further used for determining a sixth optical signal from the eighth optical signal according to the first wavelength and outputting the sixth optical signal to the second optical detector, wherein the eighth optical signal comprises the sixth optical signal, and the eighth optical signal is an optical signal obtained by reflecting the seventh optical signal through the optical fiber link or an optical signal obtained by reflecting the seventh optical signal through the optical fiber link and an optical module for receiving the seventh optical signal.

Optionally, the optical link detection device further includes an optical add/drop multiplexer having an add/drop multiplexing structure. The optical add/drop multiplexer is configured to acquire a seventh optical signal and an eighth optical signal, and output the seventh optical signal and the eighth optical signal to the wavelength gate.

Optionally, the optical link detection device further comprises an optical modulator. The optical modulator is used for modulating the ninth optical signal and outputting the modulated ninth optical signal to the optical add/drop multiplexer; wherein the ninth optical signal comprises the first optical signal and the modulated ninth optical signal comprises the seventh optical signal. Correspondingly, the optical add/drop multiplexer acquires a seventh optical signal and an eighth optical signal, and specifically: acquiring a part of optical signals from the modulated ninth optical signals as seventh optical signals; a part of the optical signal is obtained as the eighth optical signal from the optical signal reflected by the modulated ninth optical signal in the optical fiber link, or a part of the optical signal is obtained as the eighth optical signal from the optical signal reflected by the modulated ninth optical signal in the optical fiber link and the optical module receiving the modulated ninth optical signal.

In another alternative embodiment, the optical link detection device further comprises a microresonator. The micro resonator is used for determining a fifth optical signal from a seventh optical signal according to the first wavelength and outputting the fifth optical signal to the first optical detector, wherein the seventh optical signal comprises the fifth optical signal. The micro resonator is further configured to determine a sixth optical signal from the eighth optical signal according to the first wavelength, and output the sixth optical signal to the second optical detector, where the eighth optical signal includes the sixth optical signal, and the eighth optical signal is an optical signal obtained by reflecting the seventh optical signal through the optical fiber link, or an optical signal obtained by reflecting the fifth optical signal through the optical fiber link and an optical module that receives the fifth optical signal.

Optionally, the microresonator has an add/drop multiplexing structure; the microresonator is also used to acquire a seventh optical signal and an eighth optical signal.

Optionally, the microresonator is further configured to modulate a ninth optical signal. The micro resonator acquires a seventh optical signal and an eighth optical signal, specifically: and acquiring a part of the optical signal from the modulated ninth optical signal as a seventh optical signal, acquiring a part of the optical signal from the optical signal obtained by reflecting the modulated ninth optical signal on the optical fiber link as an eighth optical signal, or acquiring a part of the optical signal from the optical signal obtained by reflecting the modulated ninth optical signal on the optical fiber link and the optical module receiving the modulated ninth optical signal as an eighth optical signal.

In an alternative embodiment, the signal processor determines whether the optical link has a fault according to the information of the fifth optical signal, specifically: if the peak value of the pulse of the fifth optical signal is smaller than the third value and larger than the fourth value, determining that the optical link has a fault. Wherein the third value is the amplitude threshold of the pulses in the fifth optical signal and the fourth value is the amplitude threshold of the noise in the fifth optical signal.

Optionally, if the peak value of the pulse of the fifth optical signal is smaller than the third value and larger than the fourth value, it is determined that the first optical module in the optical link has a fault, or it is determined that the optical fiber link connecting the first optical module and the optical link detection device has a fault.

In an alternative embodiment, the signal processor determines whether the optical link has a fault according to the information of the sixth optical signal, specifically: if the peak value of the pulse of the sixth optical signal is larger than the fifth value, determining that the optical link has a fault; wherein the fifth value is an amplitude threshold of noise in the sixth optical signal.

Optionally, if the peak value of the pulse of the sixth optical signal is greater than the fifth value, it is determined that there is a fault in the second optical module in the optical link, or it is determined that there is a fault in the optical fiber link connecting the second optical module and the optical link detection device.

Optionally, the signal processor is further configured to determine a fault location of a corresponding fault point on the optical link according to a time delay of each pulse having a peak value greater than the fifth value in the sixth optical signal relative to the pulse of the fifth optical signal.

Optionally, the signal processor is further configured to determine a reflection loss of the pulse corresponding to the fault point on the optical link according to an amplitude value included in each pulse with a peak value greater than the fifth value in the sixth optical signal and an amplitude value included in the pulse of the fifth optical signal.

In a third aspect, an embodiment of the present application provides an optical link detection apparatus, including a first optical detector, a second optical detector, and a signal processor. The first optical detector is used for carrying out photoelectric conversion on a tenth optical signal to obtain information of the tenth optical signal, and outputting the information of the tenth optical signal to the signal processor, wherein the tenth optical signal is an optical pulse signal from the third optical module; the third optical module does not belong to the optical link detection device. The second optical detector is used for performing photoelectric conversion on the eleventh optical signal to obtain information of the eleventh optical signal, and outputting the information of the eleventh optical signal to the signal processor, wherein the eleventh optical signal is an optical signal obtained by reflecting the tenth optical signal through the optical fiber link or an optical signal obtained by reflecting the tenth optical signal through the optical fiber link and the fourth optical module. The signal processor is used for determining whether the optical link has faults according to the information of the tenth optical signal or the information of the eleventh optical signal, wherein the optical link comprises a third optical module, an optical fiber link and a fourth optical module.

It can be seen that the optical link detection device determines whether the optical link has a fault based on the optical pulse signal generated by the optical module not belonging to the optical link detection device, and the optical link detection device has higher sensitivity and higher capability of identifying a micro fault (a fault with smaller loss). In addition, the optical link detection device does not comprise a light source, and the first light detector, the second light detector and the signal processor in the optical link detection device can be miniaturized, so that the optical link detection device can be miniaturized.

In an alternative embodiment, the optical link detection device further comprises a wavelength gate. The wavelength gate is used for determining a tenth optical signal from the twelfth optical signal according to the first wavelength and outputting the tenth optical signal to the first optical detector, wherein the eleventh optical signal comprises the tenth optical signal. The wavelength gating device is further used for determining an eleventh optical signal from thirteenth optical signals according to the first wavelength and outputting a twelfth optical signal to the second optical detector, wherein the thirteenth optical signal comprises the eleventh optical signal, and the thirteenth optical signal is an optical signal obtained by reflecting the twelfth optical signal through an optical fiber link or an optical signal obtained by reflecting the twelfth optical signal through the optical fiber link and an optical module for receiving the twelfth optical signal.

Optionally, the optical link detection device further includes an optical add/drop multiplexer having an add/drop multiplexing structure. The optical add/drop multiplexer is configured to acquire a twelfth optical signal and a thirteenth optical signal, and output the twelfth optical signal and the thirteenth optical signal to the wavelength gate.

In another alternative embodiment, the optical link detection device further comprises a microresonator. The microresonator is configured to determine a tenth optical signal from the twelfth optical signal according to the first wavelength and output the tenth optical signal to the first photodetector, wherein the twelfth optical signal includes the tenth optical signal. The micro resonator is further configured to determine an eleventh optical signal from the thirteenth optical signal according to the first wavelength, and output the eleventh optical signal to the second optical detector, where the thirteenth optical signal includes the eleventh optical signal, and the thirteenth optical signal is an optical signal obtained by reflecting the eleventh optical signal through the optical fiber link, or an optical signal obtained by reflecting the eleventh optical signal through the optical fiber link and an optical module that receives the eleventh optical signal.

Optionally, the microresonator has an add/drop multiplexing structure; the microresonator is also used to acquire a twelfth optical signal and a thirteenth optical signal.

In an alternative embodiment, the signal processor determines whether the optical link has a fault according to the information of the tenth optical signal, specifically: if the peak value of the pulse of the tenth optical signal is smaller than the sixth value and larger than the seventh value, determining that the optical link has a fault; wherein the fifth value is the amplitude threshold of the pulses in the tenth optical signal and the sixth value is the amplitude threshold of the noise in the tenth optical signal.

In an alternative embodiment, the signal processor determines whether the optical link has a fault according to the information of the eleventh optical signal, specifically: if the peak value of the pulse of the eleventh optical signal is larger than the eighth value, determining that the optical link has a fault; wherein the eighth value is an amplitude threshold of noise in the eleventh optical signal.

Optionally, the signal processor is further configured to determine a fault location of a corresponding fault point on the optical link according to a time delay of each pulse having a peak value greater than the eighth value in the eleventh optical signal relative to the pulse of the tenth optical signal.

Optionally, the signal processor is further configured to determine a reflection loss of the pulse corresponding to the fault point on the optical link according to an amplitude value included in each pulse with a peak value greater than the eighth value in the eleventh optical signal and an amplitude value included in the pulse of the tenth optical signal.

In a fourth aspect, an embodiment of the present application provides an optical link detection method, which may be performed by an optical link detection apparatus, the method including: and performing photoelectric conversion on the first optical signal to obtain information of the first optical signal, and performing photoelectric conversion on the second optical signal to obtain information of the second optical signal. Wherein the first optical signal is an optical signal carrying traffic data from the first optical module; the second optical signal is an optical signal obtained by reflecting the first optical signal through the optical fiber link, or an optical signal obtained by reflecting the first optical signal through the optical fiber link and the second optical module. And determining whether the optical link has a fault according to the information of the first optical signal or according to the information of the first optical signal and the information of the second optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module.

The optical link detection method may further include some or all of the embodiments that may be implemented by the optical link detection device according to the first aspect, and have the beneficial effects corresponding to these embodiments, which are not described herein again.

In a fifth aspect, an embodiment of the present application provides an optical link detection method, which may be performed by an optical link detection apparatus, the method including: and performing photoelectric conversion on the fifth optical signal to obtain information of the fifth optical signal, and performing photoelectric conversion on the sixth optical signal to obtain information of the sixth optical signal. The fifth optical signal is obtained by modulating a first optical signal, and the first optical signal is an optical signal carrying service data from the first optical module; the sixth optical signal is an optical signal obtained by reflecting the fifth optical signal through the optical fiber link, or an optical signal obtained by reflecting the fifth optical signal through the optical fiber link and the second optical module. And determining whether the optical link has a fault according to the information of the fifth optical signal or the information of the sixth optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module.

The optical link detection method may further include some or all of the embodiments that may be implemented by the optical link detection device of the second aspect, and have the beneficial effects corresponding to these embodiments, which are not described herein again.

In a sixth aspect, an embodiment of the present application provides an optical link detection method, which may be performed by an optical link detection apparatus, the method including: the tenth optical signal is photoelectrically converted to obtain information of the tenth optical signal, and the eleventh optical signal is photoelectrically converted to obtain information of the eleventh optical signal. The tenth optical signal is an optical pulse signal from a third optical module, and the third optical module does not belong to the optical link detection device; the eleventh optical signal is an optical signal obtained by reflecting the tenth optical signal through the optical fiber link, or an optical signal obtained by reflecting the tenth optical signal through the optical fiber link and the fourth optical module. And determining whether the optical link has a fault according to the information of the tenth optical signal or the information of the eleventh optical signal, wherein the optical link comprises a third optical module, an optical fiber link and a fourth optical module.

In a seventh aspect, the present application provides an optical link detection apparatus, including a memory and a processor. Wherein the memory is for storing instructions or computer programs; the processor is configured to execute the computer program or instructions stored in the memory, to cause the optical link detection apparatus to perform any embodiment that is achievable by the optical link detection apparatus according to the first aspect, or perform any embodiment that is achievable by the optical link detection apparatus according to the second aspect, or perform any embodiment that is achievable by the optical link detection apparatus according to the third aspect.

In an eighth aspect, the present application provides a computer readable storage medium storing a computer program for causing an optical link detection apparatus to perform any embodiment of the first aspect or to perform any embodiment of the second aspect or to perform any embodiment of the third aspect when the computer program is run on the optical link detection apparatus.

In a ninth aspect, an embodiment of the present application provides a chip or a chip system, where the chip or the chip system includes at least one processor and an interface, where the interface and the at least one processor are interconnected by a line, and where the at least one processor is configured to execute a computer program or instructions to perform any embodiment that may be implemented by the optical link detection device according to the first aspect, or perform any embodiment that may be implemented by the optical link detection device according to the second aspect, or perform any embodiment that may be implemented by the optical link detection device according to the third aspect.

The interface in the chip may be an input/output interface, a pin, a circuit, or the like.

The chip system in the above aspect may be a System On Chip (SOC), a baseband chip, etc., where the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, etc.

In one possible implementation, the chip or chip system described above further includes at least one memory, where the at least one memory has instructions stored therein. The memory may be a memory unit within the chip, such as a register, a cache, etc., or may be a memory unit of the chip (e.g., a read-only memory, a random access memory, etc.).

In a tenth aspect, the present application provides a computer program or computer program product comprising computer instructions which, when run on an optical link detection device, cause the optical link detection device to perform any of the embodiments of the optical link detection device of the first aspect, or to perform any of the embodiments of the optical link detection device of the second aspect, or to perform any of the embodiments of the optical link detection device of the third aspect.

Drawings

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

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

FIG. 3 is a schematic diagram of an installation position of an optical link detection device according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an installation position of another optical link detection device according to an embodiment of the present application;

FIG. 5 is a schematic diagram of another installation position of an optical link detection device according to an embodiment of the present application;

FIG. 6 is a schematic diagram of another installation position of an optical link detection device according to an embodiment of the present application;

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

fig. 8 is a schematic structural diagram of another optical link detection device according to an embodiment of the present application;

fig. 9 is a schematic diagram of an add/drop multiplexing structure according to an embodiment of the present application;

fig. 10 is a schematic diagram of another add/drop multiplexing structure according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of another optical link detection device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another optical link detection device according to an embodiment of the present application;

fig. 13 is a schematic flow chart of an optical link detection method 100 according to an embodiment of the present application;

Fig. 14 is a flowchart of an optical link detection method 200 according to an embodiment of the present application;

fig. 15 is a flowchart of an optical link detection method 300 according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of another optical link detection device according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of another optical link detection device according to an embodiment of the present application.

Detailed Description

The technical scheme of the embodiment of the application can be applied to various communication scenes based on optical fiber link communication. Such as communication scenarios in wireless fronthaul optical networks, fiber access networks, fiber metropolitan area networks, fiber backbone networks, data centers, and the like.

Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application. The communication system may include, but is not limited to, an optical module 101 for transmitting optical signals, an optical module 102 for receiving optical signals, and an optical fiber link 103 connecting the optical module 101 and the optical module 102. The optical module 101 is an optical module that transmits a single-wavelength optical signal, and the optical module 102 is an optical module that receives a single-wavelength optical signal. The optical module 101 and the optical module 102 are in an optical fiber direct connection architecture, that is, single-wavelength optical signals are transmitted in the optical fiber link 103, and the optical signals sent by different optical modules 101 are transmitted to the target optical module 102 through different optical fiber links. Taking a scenario that a BBU sends an optical signal to an RRU or an AAU in a wireless fronthaul optical network as an example, the optical module 101 may be an optical transceiver unit in the BBU, and the optical module 102 may be an optical transceiver unit in the RRU or the AAU. The communication system shown in fig. 1 is exemplified by one optical module 101, one optical module 102, and an optical fiber link 103.

In a communication scenario based on optical fiber link communication, if there are a plurality of optical modules 101 that respectively transmit optical signals with different wavelengths to the optical modules 102 of respective targets, a wavelength division multiplexing (wavelength division multiplexing, WDM) architecture may be adopted instead of the optical fiber direct connection architecture between the plurality of optical modules 101 and the optical modules 102 of their targets. Then multiple optical signals of different wavelengths may be transmitted over the same optical fiber link to the optical module 102 of the respective destination on a WDM basis, that is, multiple optical signals of different wavelengths may be transmitted simultaneously in the same optical fiber link, i.e., a multi-wavelength optical signal. In this case, in addition to the optical module 101, the optical module 102, and the optical fiber link 103, a combiner 104 and a demultiplexer 105 may be included in the communication system, as shown in fig. 2. Wherein the combiner 104 is configured to combine optical signals with different wavelengths from the plurality of optical modules 101 and couple the optical signals into the optical fiber link 103 for transmission; the demultiplexer 105 can be used to separate the optical signals in the optical fiber link 103 and recover a plurality of optical signals having different wavelengths. Taking a scenario in which a BBU sends an optical signal to an RRU or an AAU in a wireless fronthaul optical network as an example, the plurality of optical modules 101 are a plurality of optical transceiver units in the BBU, and the plurality of optical modules 102 are a plurality of optical transceiver units in the RRU or the AAU.

The optical link detection method provided by the embodiment of the application can be executed by the optical link detection device.

The optical link detection device may be a stand-alone device with a power supply interface, and may further have a communication interface for communicating with other devices, where the communication interface may be configured to receive parameters (such as a period of time for the optical link detection device to perform the optical link detection method, a bandwidth supported by the optical link detection device, a sampling point number when the optical link detection device processes a signal, etc.) configured by the other devices for the optical link detection device, and the communication interface may be further configured to output a detection result obtained by the optical link detection device performing the optical link detection method to the other devices. For example, based on the communication system shown in fig. 1, when an optical fiber direct connection architecture is provided between the optical module 101 and the optical module 102, the optical link detection device may be disposed on the optical fiber link near the optical module 101, as shown in fig. 3, where the optical link detection device is connected to the optical fiber link by coupling. In this case, the optical link detection device may be configured to detect whether the optical link (including the optical module 101, the optical fiber link 103, and the optical module 102) corresponding to the optical signal sent by the optical module 101 has a fault. If there are multiple optical modules 101 in the communication system shown in fig. 1, an optical link detection device may be installed on the optical fiber link connecting each optical module 101 and each optical module 102, so as to detect whether the optical link corresponding to the optical signal sent by each optical module 101 has a fault.

For another example, based on the communication system shown in fig. 2, when a WDM architecture is provided between the optical module 101 and the optical module 102, the optical link detection device may be disposed on the side of the optical fiber link 103 close to the multiplexer 104, as shown in fig. 4, where the optical link detection device is connected to the optical fiber link by coupling. In this case, the optical link detection device may be configured to detect whether an optical link corresponding to an optical signal sent by each optical module 101 in the plurality of optical modules 101 has a fault, where the optical link corresponding to the optical signal sent by each optical module 101 includes: the optical module 101, the multiplexer 104, the optical fiber link 103, the demultiplexer 105, and the optical module 102 for receiving the optical signal.

The optical link detection device may also be integrated into other devices (or other functional modules), where other devices provide power, communication, packaging, etc. requirements for the optical link detection device. For example, based on the communication system shown in fig. 1, when the optical module 101 and the optical module 102 are in a fiber direct connection architecture, the optical link detection device may also be integrated in the optical module 101, as shown in fig. 5. In this case, the optical link detection device may be configured to detect whether an optical link corresponding to an optical signal sent by the optical module 101 has a fault, where the optical link of the optical signal sent by the optical module 101 includes: optical module 101, optical fiber link 103, optical module 102. If there are a plurality of optical modules 101 in the communication system shown in fig. 1, one optical link detection device is integrated for each optical module 101, and the optical link detection device integrated in a certain optical module 101 may be used to detect whether there is a fault in an optical link corresponding to an optical signal sent by that optical module 101.

For another example, the communication system shown in fig. 2 further includes an optical link automatic switching protection (optical fiber line auto switch protection, OLP) module 106, and the optical link detection device may be integrated in the OLP module 106, as shown in fig. 6. In this case, the optical link detection device may be configured to detect whether an optical link corresponding to an optical signal sent by each optical module 101 in the plurality of optical modules 101 has a fault, where the optical link corresponding to the optical signal sent by each optical module 101 includes: the optical module 101, the multiplexer 104, the optical fiber link, the demultiplexer 105, and the optical module 102 for receiving the optical signal. If the optical link detection device detects that the main optical fiber link 103a for transmitting an optical signal has a fault, the OLP module 106 may switch from the main optical fiber link 103a to the sub optical fiber link 103b through the OLP switch, and the optical signal is transmitted by the sub optical fiber link 103 b.

The following describes an optical link detection device according to an embodiment of the present application in detail with reference to the accompanying drawings.

Fig. 7 is a schematic structural diagram of an optical link detection device according to an embodiment of the present application, where the optical link detection device includes: a first light detector 201, a second light detector 202 and a signal processor 203. The functions of the respective parts in the optical link detection apparatus include those described in embodiments 1 to 3.

In embodiment 1, the optical link detection device is configured to perform an optical link detection method based on an optical signal carrying service data, and functions of each part in fig. 7 are as follows:

the first optical detector 201 is configured to perform optical-to-electrical conversion on a first optical signal, obtain information of the first optical signal, and output the information of the first optical signal to the signal processor 203, where the first optical signal is an optical signal carrying service data from the first optical module.

If the optical link detection device is applied to a front optical network, a middle optical network or a back optical network, the optical signal carrying the service data can be an optical signal carrying the cell data; if the optical link detection device is applied to a data center, an access network, a core network or a backbone network, the optical signal carrying the service data may be an optical signal carrying signaling, an optical signal carrying the network node interaction information, or an optical signal carrying the user data.

The second optical detector 202 is configured to perform optical-to-electrical conversion on a second optical signal, obtain information of the second optical signal, and output the information of the second optical signal to the signal processor 203, where the second optical signal is an optical signal obtained by reflecting the first optical signal through an optical fiber link, or an optical signal obtained by reflecting the first optical signal through an optical fiber link and a second optical module.

The first optical module is an optical module for transmitting the first optical signal, and the second optical module is an optical module for receiving the first optical signal. For example, when the optical link detection device is applied to a scenario in which the BBU sends an optical signal to the AAU or the RRU in the forward optical network, the first optical module is an optical module in the BBU for sending the first optical signal, and the second optical module is an optical module in the AAU or the RRU for receiving the first optical signal.

Optionally, the first light detector 201 and the second light detector 202 are determined based on a commercially available optical signal modulation format in the communication scene. For example, if the modulation format of the commercial optical signal in the optical network is amplitude modulation (may also be referred to as optical intensity modulation), the first optical detector 201 and the second optical detector 202 are optical detectors, such as photodiodes, with an optical intensity detection function.

Alternatively, the first light detector 201 and the second light detector 202 may be light detectors having low bandwidth characteristics. If the first optical signal and the second optical signal are high-speed digital modulation signals, for example, signals having a rate of 40Gb/s and modulated with on-off switching (OOK), the first optical detector 201 is further configured to filter the first optical signal based on its band-limitation, in addition to performing optical-to-electrical conversion on the first optical signal, to obtain a low-speed multi-level analog signal carrying information of the first optical signal; the second photodetector 202 is used for filtering the second optical signal based on its band-limitation in addition to performing photoelectric conversion on the second optical signal, so as to obtain a low-speed multi-level analog signal carrying information of the second optical signal. This approach allows the signal processor 203 to perform optical link detection based on low-speed multi-level analog signals, which is beneficial to reducing the complexity of the signal processor 203 in determining whether an optical link is faulty or not, and also reduces the cost of the optical link detection device.

The signal processor 203 is configured to determine whether the optical link has a fault according to the information of the first optical signal or according to the information of the first optical signal and the information of the second optical signal, where the optical link includes a first optical module, an optical fiber link, and a second optical module.

Alternatively, the signal processor 203 may determine, in determining whether the optical link is faulty, based on an analog signal carrying information of the first optical signal or based on an analog signal carrying information of the first optical signal and an analog signal carrying information of the second optical signal. Wherein the analog signal carrying the information of the first optical signal comes from the first optical detector 201; the analog signal carrying the information of the second optical signal comes from the second optical detector 202.

Alternatively, the signal processor 203 may determine, in determining whether the optical link is down, based on a digital signal carrying information of the first optical signal or based on a digital signal carrying information of the first optical signal and a digital signal carrying information of the second optical signal. Wherein the digital signal carrying the information of the first optical signal is obtained by performing analog-to-digital conversion on the analog signal carrying the information of the first optical signal from the first optical detector 201; the digital signal carrying the information of the second optical signal is obtained by analog-to-digital conversion of an analog signal carrying the information of the second optical signal from the second optical detector 202. In addition, if the amplitude sampling range when the information of the first optical signal is subjected to analog-to-digital conversion is different from that when the information of the second optical signal is subjected to analog-to-digital conversion, the signal processor 203 is further configured to normalize the digital signal carrying the information of the first optical signal and the digital signal carrying the information of the second optical signal.

Optionally, the optical link detection device may further include an analog-to-digital converter, and the analog-to-digital converter may be configured to analog-to-digital convert an analog signal carrying information of the first optical signal and to analog-to-digital convert an analog signal carrying information of the second optical signal. The analog-to-digital converter may be a separate device from the first light detector 201, the second light detector 202 and the signal processor 203, and may also be integrated in the signal processor 203.

In an alternative embodiment, the optical link detection apparatus may further include a wavelength gate 204, as shown in fig. 8. The wavelength gate 204 is configured to determine a first optical signal from a third optical signal according to the first wavelength, and output the first optical signal to the first photodetector 201, where the third optical signal includes the first optical signal. The wavelength gate 204 is further configured to determine a second optical signal from the fourth optical signal according to the first wavelength, and output the second optical signal to the second optical detector 202, where the fourth optical signal includes the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through the optical fiber link, or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module that receives the third optical signal.

Wherein the third optical signal includes optical signals of a plurality of wavelengths carrying traffic data, which may be obtained by combining the optical signals of the plurality of wavelengths carrying traffic data (including the first optical signal) by the multiplexer based on the WDM. The optical module that receives the third optical signal includes a plurality of optical modules (including the second optical module) that respectively receive the optical signals of the plurality of wavelengths, and the optical module that transmits the third optical signal includes a plurality of optical modules (including the first optical module) that respectively transmit the optical signals of the plurality of wavelengths.

The first wavelength is the wavelength of the first optical signal, and is also the center wavelength of the wavelength gate 204 when the wavelength gate 204 determines the first optical signal from the third optical signal. The signal processor 203 may also send a wavelength selection signal to the wavelength gate 204 to control the center wavelength of the wavelength gate 204 to be the first wavelength before the wavelength gate 204 determines the first optical signal from the third optical signal and the second optical signal from the fourth optical signal from the first wavelength. A specific embodiment of determining the wavelength selective signal before the signal processor 203 sends the wavelength selective signal to the wavelength gate 204 is described below.

Specifically, the signal processor 203 may transmit a plurality of control signals of different powers to the wavelength gate 204. The wavelength gate 204 processes the third optical signal based on the plurality of control signals, respectively, to obtain a plurality of optical signals #1, and outputs the plurality of optical signals #1 to the first optical detector 201, wherein the plurality of optical signals #1 includes the optical signal #1 obtained under each of the plurality of control signals. The first photodetector 201 performs photoelectric conversion on the plurality of optical signals #1, respectively, to obtain an electrical signal #1 corresponding to each optical signal #1 in the plurality of optical signals #1, and outputs the electrical signal #1 corresponding to each optical signal #1 to the signal processor 203. The signal processor 203 calculates the power of each electrical signal #1 to determine a power-control signal power curve for the electrical signal #1 that characterizes the power of the electrical signal #1 corresponding to the optical signal #1 obtained at each control signal. The signal processor 203 determines a maximum point when the power of the electric signal #1 is a maximum value from the curve, and selects a control signal corresponding to any one of the maximum points as the wavelength selection signal.

Wherein the plurality of control signals having different powers may control the values of the center wavelengths of the wavelength gates 204 to be different, so that the wavelength gates 204 may process the third optical signal at the numerically varying center wavelength. Alternatively, by designing the values of the powers of the plurality of control signals, the value of the center wavelength of the wavelength gate 204 may be changed within a preset range, for example, the value of the center wavelength of the wavelength gate 204 may be changed in steps at preset intervals within a preset range, where the preset range may be a free spectrum width (free spectral range, FSR) range.

In the above embodiment, the electric signal #1 output by the first photodetector 201 is an analog signal, and the signal processor 203 may directly calculate the power of the electric signal #1 as an analog signal when calculating the power of the electric signal #1, or may calculate the power of a digital signal after analog-to-digital conversion of the electric signal #1 as an analog signal.

In a scenario where optical signals of a plurality of wavelengths carrying traffic data are transmitted in the same optical fiber link by the WDM system (see fig. 2), there are a plurality of maximum points where the power of the electrical signal #1 is a maximum in the power curve of the power control signal of the electrical signal # 1. The signal processor 203 may respectively use the control signals corresponding to the plurality of maximum points as wavelength selection signals to control the center wavelength of the wavelength gate 204 to be the wavelength of each of the plurality of optical signals carrying service data. Then, for each of a plurality of optical signals carrying traffic data and having different wavelengths, the wavelength gate 204 may determine the optical signal from the third optical signal according to the wavelength of the optical signal, and the signal processor 203 may perform fault detection on the optical link corresponding to the optical signal. Therefore, the optical link detection device can detect faults of the optical links corresponding to each of the plurality of optical signals with different wavelengths for carrying service data. Wherein, the optical link that every optical signal corresponds includes: an optical module for transmitting the optical signal, a combiner, an optical fiber link, a demultiplexer, and an optical module for receiving the optical signal.

In addition, the optical link detection device may determine that a faulty optical link exists when a fault occurs at a position among a plurality of optical links corresponding to a plurality of optical signals. Taking fig. 2 as an example, if a port of a plurality of ports for receiving a plurality of optical signals in the combiner fails, the optical link detection device detects a failure of an optical link corresponding to each of the plurality of optical signals, so that the optical link having a failure at the port position of the combiner can be determined, and further, the port having a failure in the combiner can be determined. For another example, in a scenario in which communication is performed between the BBU and the AAU in the optical network based on the WDM, if a failure occurs in one of the plurality of optical modules in the BBU, the optical link detection device performs failure detection on an optical link corresponding to each of the plurality of optical signals transmitted by the plurality of optical modules, so that it is possible to determine that the optical link in the BBU has a failure, and further, it is possible to determine that the optical module has a failure.

Alternatively, the plurality of wavelength selection signals determined by the signal processor 203 may be sequentially output to the wavelength gate 204. Specifically, the signal processor 203 may output a certain wavelength selection signal to the wavelength gate 204, after the wavelength gate 204 determines an optical signal with the wavelength from the third optical signal according to the center wavelength controlled by the wavelength selection signal, the signal processor 203 outputs another wavelength selection signal to the wavelength gate 204; the above process is repeated until a plurality of wavelength-selective signals are each sequentially output to the wavelength gate 204. Alternatively, the signal processor 203 may output a certain wavelength selection signal to the wavelength gate 204, where the wavelength gate 204 determines an optical signal having the wavelength from the third optical signal according to the center wavelength controlled by the wavelength selection signal, and the signal processor 203 outputs another wavelength selection signal to the wavelength gate 204 after performing optical link detection on the determined optical signal; the above process is repeated until a plurality of wavelength-selective signals are each sequentially output to the wavelength gate 204.

Optionally, in conjunction with fig. 8, the optical link detection apparatus may further include an optical add/drop multiplexer 205 having an add/drop multiplexing structure. The optical add/drop multiplexer 205 is configured to obtain the third optical signal and the fourth optical signal, and output the third optical signal and the fourth optical signal to the wavelength gate 204.

Wherein the third optical signal is a part of optical signals obtained by the optical add/drop multiplexer 205 from the optical signals with multiple wavelengths carrying service data transmitted by the optical fiber link, where the part of optical signals includes a part of optical signals of each of the multiple wavelengths of optical signals. When the optical link detection device detects the optical link, part of the optical signals of the plurality of wavelengths carrying the service data transmitted by the optical fiber link are used, and the rest of the optical signals can be normally transmitted to the optical module receiving the optical signals, so that normal service communication between the two optical modules receiving and transmitting the optical signals is ensured. Therefore, the optical link detection device can not interfere the service communication based on the optical link between the two optical modules receiving and transmitting the optical signals when performing the optical link detection, and further can realize the on-line detection.

For example, the optical module for transmitting the third optical signal includes an optical module 1, an optical module 2 and an optical module 3, the optical module 1 transmits the optical signal 1 carrying the service data, the optical module 2 transmits the optical signal 2 carrying the service data, the optical module 3 transmits the optical signal 3 carrying the service data, wherein the wavelengths of the optical signal 1, the optical signal 2 and the optical signal 3 are different, and the optical signal 1, the optical signal 2 and the optical signal 3 are converged by the combiner based on the WDM mode and then coupled to the same optical fiber link for transmission. The third optical signal obtained based on the add/drop multiplexing structure includes a part of the optical signals in the optical signal 1, a part of the optical signals in the optical signal 2, and a part of the optical signals in the optical signal 3.

A possible form of add/drop multiplexing architecture is shown in fig. 9 and 10. In the following, a possible form of the add/drop multiplexing structure will be described by taking as an example that the third optical signal is obtained from the optical signal 1 transmitted in the optical fiber link and the fourth optical signal is obtained from the optical signal 2 transmitted in the optical fiber link based on the add/drop multiplexing structure. Wherein, the optical signal 1 is transmitted from an input port (also referred to as an incident port) (i.e., port a) to a through-coupling port (i.e., port B) of the optical fiber link, the optical signal 2 is transmitted from the through-coupling port to the input port of the optical fiber link, and the optical signal 2 is an optical signal obtained by reflecting the optical signal 1 on the optical fiber link or an optical signal obtained by reflecting the optical signal 1 on the optical fiber link and an optical module receiving the optical signal 1.

In fig. 9, a portion of the optical signals (i.e., the third optical signal) in optical signal 1 is acquired from the cross-coupled port of port a (i.e., port C1 in fig. 9) based on route a, and the remaining portion of the optical signals continue to be transmitted in the optical fiber link; a portion of the optical signals (i.e., the fourth optical signal) in optical signal 2 is acquired from the cross-coupled port of port B (i.e., port C2 in fig. 9) based on route B, and the remaining portion of the optical signals continue to be transmitted in the fiber link.

In fig. 10, a part of the optical signals (i.e., the third optical signals) in the optical signals 1 are acquired from the download port of the port a (i.e., the port D1 in fig. 10) based on the route C, and the rest of the optical signals continue to be transmitted in the optical fiber link; a portion of the optical signals (i.e., the fourth optical signal) in the optical signals 2 is acquired from the download port of the port B (i.e., the port D2 in fig. 10) based on the route D, and the remaining portion of the optical signals continue to be transmitted in the optical fiber link.

In addition, in the scenario (as shown in fig. 1) where an optical fiber direct connection architecture is provided between the first optical module and the second optical module, that is, in the optical fiber link, only the optical signal carrying the service data sent by the first optical module is transmitted, the optical link detection device only performs optical link detection on the single-wavelength optical signal, and the optical link detection device may not include the wavelength gate 204. The optical add/drop multiplexer 205 is configured to obtain a first optical signal and a second optical signal based on an add/drop multiplexing structure, and output the first optical signal to the first optical detector 201 and the second optical signal to the second optical detector 202. For a specific explanation of acquiring the first optical signal and the second optical signal based on the add/drop multiplexing structure, reference may be made to a related explanation of acquiring the third optical signal and the fourth optical signal based on the add/drop multiplexing structure, which is not repeated herein. In fig. 8, the optical add/drop multiplexer 205 is coupled to the optical fiber link based on coupling. That is, the optical link detection device is connected with the first optical module and the second optical module, and is specifically expressed as follows: the optical add/drop multiplexer 205 is connected with the first optical module through an optical fiber link, and is connected with the second optical module through an optical fiber link, and the connection modes are all coupling modes.

In another alternative embodiment, the optical link detection device may also include a microresonator 206, as shown in FIG. 11. Microresonator 206 is configured to determine a first optical signal from a third optical signal based on the first wavelength, where the third optical signal includes the first optical signal. The microresonator 206 is further configured to determine a second optical signal from a fourth optical signal according to the first wavelength, where the fourth optical signal includes the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through the optical fiber link, or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module that receives the third optical signal. For the specific description of the third optical signal and the fourth optical signal, reference may be made to the foregoing description of the third optical signal and the fourth optical signal, which are not repeated herein.

The micro resonator 206 may have all the functions of the wavelength gate 204 in the foregoing embodiment, and the specific description of the micro resonator 206 determining the first optical signal from the third optical signal according to the first wavelength and determining the second optical signal from the fourth optical signal according to the first wavelength may refer to the relevant description of the wavelength gate 204 determining the first optical signal from the third optical signal according to the first wavelength and determining the second optical signal from the fourth optical signal according to the first wavelength, which will not be repeated herein.

Alternatively, microresonator 206 has an add/drop multiplexing structure. Microresonator 206 is also used to acquire a third optical signal and a fourth optical signal. The microresonator 206 may have all the functions of the optical add/drop multiplexer 205 in the above embodiments, and the detailed description of the acquiring of the third optical signal and the fourth optical signal by referring to the optical add/drop multiplexer 205 is omitted herein.

In addition, in the scenario of a fiber optic direct link architecture between the first optical module and the second optical module (e.g., fig. 1), the microresonator 206 is used to acquire the first optical signal and the second optical signal. In fig. 11, the microresonator 206 is coupled to the fiber link by a coupling-based manner. That is, the optical link detection device is connected with the first optical module and the second optical module, and is specifically expressed as follows: the microresonator 206 is connected to the first optical module by an optical fiber link, and is connected to the second optical module by an optical fiber link, and the connection modes are all coupling modes.

It can be seen that the functionality of wavelength gate 204 and the functionality of optical add/drop multiplexer 205 in fig. 8 can be implemented by a single device, microresonator 206. For example, microresonator 206 may be a silicon-based microring resonator having an add/drop multiplexing structure as shown in FIG. 10. The function of the wavelength gate 204 may be implemented depending on the filtering characteristics of the silicon-based micro-ring resonator, and the adjustability of the center wavelength of the silicon-based micro-ring resonator may be implemented depending on elements (e.g., metal thermodes, p-i-n junctions) integrated on the silicon-based micro-ring resonator that are capable of changing the refractive index of the waveguide.

In an alternative embodiment, the signal processor 203 may determine whether the optical link has a fault based on the information of the first optical signal. Specifically, when the average power corresponding to the information of the first optical signal is smaller than the first value, determining that the optical link has a fault. The average power corresponding to the information of the first optical signal refers to the average power of the electrical signal after the first optical signal is subjected to photoelectric conversion (and optional analog-to-digital conversion). The first value is a power threshold of the first optical signal; the first value may be determined according to an average power of the optical signal having the first wavelength transmitted by the first optical module, and may be specifically equal to a value obtained by subtracting an insertion loss caused by each device passing through in a process of transmitting the optical signal from the first optical module to the optical link detection apparatus from the average power of the optical signal having the first wavelength transmitted by the first optical module. The devices through which the optical signal having the first wavelength passes during transmission are, for example: and the optical fiber link, the combiner, the optical link detection device and other devices are connected with the first optical module and the optical link detection device.

Further, if the average power corresponding to the information of the first optical signal is smaller than the first value, it may be determined that a fault exists in the first optical module in the optical link, or it may be determined that a fault exists in an optical fiber link connecting the first optical module and the optical link detection device.

In an alternative embodiment, the signal processor 203 may determine whether the optical link has a fault according to the information of the first optical signal and the information of the second optical signal, specifically: calculating a cross-correlation function of the amplitude information of the first optical signal subjected to photoelectric conversion and the amplitude information of the second optical signal subjected to photoelectric conversion to obtain one or more cross-correlation coefficients; if a cross correlation coefficient greater than the second value exists in the one or more cross correlation coefficients, determining that the optical link has a fault. Further, if there is a cross correlation coefficient of the one or more cross correlation coefficients that is greater than the second value, it may be determined that there is a failure of the second optical module in the optical link or that there is a failure in the optical fiber link connecting the second optical module and the optical link detection device.

Wherein the second value is an amplitude threshold determined based on noise in the first optical signal and noise in the second optical signal. Specifically, the second value may be determined based on: the cross-correlation coefficient between the amplitude information of the noise subjected to photoelectric conversion in the first optical signal and the amplitude information of the noise subjected to photoelectric conversion in the second optical signal, and the cross-correlation coefficient between the amplitude information of the noise subjected to photoelectric conversion in the first optical signal and the amplitude information of the noise subjected to photoelectric conversion in the second optical signal.

Optionally, the signal processor 203 is further configured to normalize the amplitude information of the first optical signal after the photoelectric conversion and the amplitude information of the second optical signal after the photoelectric conversion. The cross-correlation function calculated by the signal processor 203 is a cross-correlation function between information normalized by the amplitude information of the first optical signal subjected to photoelectric conversion and information normalized by the amplitude information of the second optical signal subjected to photoelectric conversion. Optionally, the signal processor 203 may normalize the amplitude information of the first optical signal after photoelectric conversion and the amplitude information of the second optical signal after photoelectric conversion by combining the signal-to-noise ratio of the optical link.

Optionally, the signal processor 203 may further determine a location of the fault point on the optical link according to a time corresponding to each of the one or more cross-correlation coefficients greater than the second value. In the cross-correlation pattern formed by the one or more cross-correlation coefficients obtained by the signal processor 203, there are one or more pulses with peaks greater than the second value, and the peaks of the one or more pulses are cross-correlation coefficients corresponding to one or more maxima points in the cross-correlation pattern greater than the second value. Each of the one or more pulses having a peak value greater than the second value corresponds to a point of failure on the optical link. Then, the signal processor 203 may determine the location of the corresponding fault point on the optical link for each pulse having a peak value greater than the second value based on the time corresponding to the peak value.

For example, if the time corresponding to the peak in a pulse having a peak value larger than the second value is tThe pulse is smaller than the length of the optical fiber link connecting the second optical module and the optical link detection device, and the position of the corresponding fault point on the optical link is: in the optical fiber link connecting the second optical module and the optical link detecting device, the distance from the optical link detecting device is +.>Is a position of (2); if it isAnd if the length of the optical fiber link is equal to the length of the optical fiber link connecting the second optical module and the optical link detection device, indicating that the second optical module has faults. Where c is the speed of light at which the optical signal is transmitted in the fiber. In consideration of measurement errors, the method of determining the position of the fault point may be that if the length ratio of the optical fiber link connecting the second optical module and the optical link detecting device is +.>If the first error threshold is large, the position of the corresponding fault point of the pulse on the optical link is as follows: in the optical fiber link connecting the second optical module and the optical link detecting device, the distance from the optical link detecting device is +.>Is a position of (2); if->And if the absolute value of the difference between the optical fiber link and the optical fiber link connecting the second optical module and the optical link detection device is smaller than the first error threshold, indicating that the second optical module has faults.

Optionally, the signal processor 203 is further configured to determine a reflection loss at the fault point on the optical link according to a value of each of the one or more cross-correlation coefficients that is greater than the second value.

Specifically, in the cross-correlation spectrum composed of one or more cross-correlation coefficients, each of one or more pulses having a peak value greater than the second value corresponds to a fault pointIn decibels (dB). Wherein R is ₁ 、R ₂ 、…、R _i I cross-correlation coefficients forming the pulse, wherein the i cross-correlation coefficients are all larger than a second value, and i is a positive integer; p is the power of the analog signal after photoelectric conversion of the first optical signal or the power of the digital signal after photoelectric conversion and analog-to-digital conversion of the first optical signal.

Optionally, the signal processor 203 may be further configured to output fault information of the optical link to the display panel to inform the user. Wherein the failure information of the optical link includes at least one of: whether the optical link corresponding to the first optical signal has a fault, a fault position of a fault point and reflection loss of the fault point. The display panel may be in the optical link detection device or in another device having a display function different from the optical link detection device. If the display panel is in another device having a display function other than the optical link detection apparatus, the optical link detection apparatus may further include a communication interface through which the signal processor 203 may output failure information of the optical link to the display panel.

In addition, the signal processor 203 may be a low cost microcontroller such as a general purpose micro control unit, a programmable logic gate array, or the like. Alternatively, the functions of the signal processor 203 may be distributed and implemented in different hardware forms.

In summary, the optical link detection device determines whether the optical link has a fault based on the optical signal carrying the service data, where the optical link includes an optical module that sends the optical signal carrying the service data, an optical fiber link that transmits the optical signal carrying the service data, and an optical module that receives the optical signal carrying the service data. Therefore, the optical link detection device determines whether the optical link has faults or not based on the optical signals carrying the service data, and the interference on the service communication based on the optical link between the two optical modules receiving and transmitting the optical signals is avoided, so that the on-line fault detection is realized. In addition, the optical link detection device does not contain a light source, and the first light detector, the second light detector, the signal processor, the optional wavelength gating device, the optical add/drop multiplexer and the microresonator in the optical link detection device can be miniaturized, so that the optical link detection device can be miniaturized.

In embodiment 2, the optical link detection device is configured to perform an optical link detection method based on an optical signal modulated by an optical signal carrying service data, and functions of each part in fig. 7 are as follows:

The first optical detector 201 is configured to perform optical-to-electrical conversion on a fifth optical signal, obtain information of the fifth optical signal, and output the information of the fifth optical signal to the signal processor 203, where the fifth optical signal is obtained by modulating a first optical signal, and the first optical signal is an optical signal from the first optical module that carries service data.

The second photodetector 202 is configured to photoelectrically convert the sixth optical signal to obtain information of the sixth optical signal, and output the information of the sixth optical signal to the signal processor 203, where the sixth optical signal is an optical signal obtained by reflecting the fifth optical signal through an optical fiber link, or an optical signal obtained by reflecting the fifth optical signal through an optical fiber link and a second optical module.

The first optical signal may be modulated by amplitude modulation (may also be referred to as light intensity modulation), phase modulation, polarization modulation, frequency modulation, or the like. The first light detector 201 and the second light detector 202 are determined based on a modulation scheme in which the first light signal is modulated. For example, if the modulation mode is amplitude modulation, the first light detector 201 and the second light detector 202 are detectors (such as photodiodes) with light intensity detection function; if the modulation mode is phase modulation, the first optical detector 201 and the second optical detector 202 are detectors (such as optical coherent receivers) with an optical phase detection function.

The signal processor 203 is configured to determine whether the optical link has a fault according to the information of the fifth optical signal or the information of the sixth optical signal, where the optical link includes a first optical module, an optical fiber link, and a second optical module.

The specific manner in which the optical link detection device determines the fifth optical signal and the sixth optical signal may be as described in embodiments 1 to 3.

In embodiment 1, the optical link detection apparatus further includes a wavelength gate 204, an optical add/drop multiplexer 205, and an optical modulator 207, as shown in fig. 12. In fig. 12, the optical link detection device is connected to the first optical module and the second optical module, and is specifically shown as follows: the optical modulator 207 is connected to the first optical module through an optical fiber link, and the optical add/drop multiplexer 205 is connected to the second optical module through an optical fiber link, and the connection modes are all coupling modes.

The optical modulator 207 modulates the ninth optical signal and outputs the modulated ninth optical signal to the optical add/drop multiplexer 205; wherein the ninth optical signal comprises the first optical signal. The ninth optical signal comprises a plurality of wavelengths of optical signals carrying traffic data transmitted in an optical fiber link.

The optical add/drop multiplexer 205 acquires a part of the optical signal from the modulated ninth optical signal as a seventh optical signal; obtaining a part of optical signals from the modulated ninth optical signals reflected by the optical fiber link or the optical signals reflected by the optical fiber link and the optical module for receiving the ninth optical signals as eighth optical signals; the seventh optical signal and the eighth optical signal are output to the wavelength gate 204.

The wavelength gate 204 determines a fifth optical signal from the seventh optical signal according to the first wavelength, and outputs the fifth optical signal to the first optical detector 201, wherein the seventh optical signal includes the fifth optical signal; and determining a sixth optical signal from the eighth optical signal according to the first wavelength, and outputting the sixth optical signal to the second optical detector 202, wherein the eighth optical signal comprises the sixth optical signal, and the eighth optical signal is an optical signal obtained by reflecting the seventh optical signal through an optical fiber link or an optical signal obtained by reflecting the seventh optical signal through the optical fiber link and an optical module for receiving the seventh optical signal.

The manner in which the optical add/drop multiplexer 205 obtains the seventh optical signal and the eighth optical signal is similar to the manner in which the optical add/drop multiplexer 205 obtains the third optical signal and the fourth optical signal in embodiment 1, and the manner in which the wavelength gate 204 determines the fifth optical signal and the sixth optical signal is similar to the manner in which the first optical signal and the second optical signal are determined in embodiment 1, which is not repeated here.

Embodiment 2 further includes a micro resonator 206 and an optical modulator 207. The optical link detection device is connected with the first optical module and the second optical module and is specifically expressed as follows: the optical modulator 207 is connected with the first optical module through an optical fiber link, and the micro resonator 206 is connected with the second optical module through an optical fiber link, and the connection modes are all coupling modes.

In this embodiment, the optical modulator 207 has the function of the optical modulator 207 in embodiment 1, and the optical modulator 207 outputs the modulated ninth optical signal to the microresonator 206. The microresonator 206 has the functions of the wavelength gate 204 and the optical add/drop multiplexer 205 of embodiment 1. For a specific description of the determination of the fifth optical signal and the sixth optical signal by the micro resonator 206, reference is made to the related description in embodiment 1, and the description thereof will not be repeated here.

Embodiment 3 further includes a case where the optical link detection device includes a microresonator 206, as shown in fig. 11. In fig. 11, the optical link detection device is connected to the first optical module and the second optical module, and is specifically shown as follows: the microresonator 206 is connected to the first optical module by an optical fiber link, and is connected to the second optical module by an optical fiber link, and the connection modes are all coupling modes. The microresonator 206 has the functions of the wavelength gate 204, the optical add/drop multiplexer 205, and the optical modulator 207 of embodiment 1. If the modulation regime is light intensity modulation, the function of the optical modulator 207 may be implemented in dependence on elements integrated on the microresonator that are capable of changing the refractive index of the waveguide (e.g., metal hot electrodes, p-i-n junctions) and interference effects in the waveguide coupling.

In this case, the manner of determining the fifth optical signal and the sixth optical signal is as described in embodiment 3.1 and embodiment 3.2.

Embodiment 3.1, the microresonator 206 modulates the ninth optical signal; obtaining a part of optical signals from the modulated ninth optical signals to serve as seventh optical signals; obtaining a part of optical signals from the modulated ninth optical signals reflected by the optical fiber link or the optical signals reflected by the optical fiber link and the optical module for receiving the ninth optical signals as eighth optical signals; determining a fifth optical signal from the seventh optical signal according to the first wavelength, and outputting the fifth optical signal to the first photodetector 201; a sixth optical signal is determined from the eighth optical signal according to the first wavelength and output to the second optical detector 202.

In embodiment 3.2, the microresonator 206 determines an optical signal having a first wavelength from the ninth optical signal according to the first wavelength, and modulates the optical signal having the first wavelength to obtain a modulated optical signal; and then acquiring a part of optical signals from the modulated optical signals as fifth optical signals, and acquiring a part of optical signals from the optical signals obtained by reflecting the modulated optical signals on the optical fiber link as sixth optical signals, or acquiring a part of optical signals from the optical signals obtained by reflecting the modulated optical signals on the optical fiber link and the second optical module as sixth optical signals.

For example, the optical module 1 sends an optical signal 1 carrying service data, the optical module 2 sends an optical signal 2 carrying service data, and the optical module 3 sends an optical signal 3 carrying service data, where wavelengths of the optical signal 1, the optical signal 2 and the optical signal 3 are different, and the optical signal 1, the optical signal 2 and the optical signal 3 are converged by a combiner based on a WDM mode to obtain a ninth optical signal. The first wavelength is the wavelength of the optical signal 1. When embodiment 3.1 is used, the microresonator 206 modulates the optical signals 1, 2, and 3, and obtains a part of the optical signals from the modulated optical signals 1, 2, and 3 as a seventh optical signal, that is, the seventh optical signal includes: a part of the modulated optical signal 1, a part of the modulated optical signal 2 and a part of the modulated optical signal 3; from which an optical signal having the first wavelength is determined as the fifth optical signal, i.e. the fifth optical signal is part of the modulated optical signal 1. When embodiment 3.2 is used, the microresonator 206 determines the optical signal 1 from the ninth optical signal according to the first wavelength, and modulates the optical signal 1; a partial optical signal is obtained from the modulated optical signal 1 as a fifth optical signal.

Alternatively, in embodiments 1 to 3, the optical modulator 207 or the micro resonator 206 modulates the ninth optical signal, which may be specifically: the optical modulator 207 or the microresonator 206 modulates the ninth optical signal based on the modulated signal received from the signal processor 203. The modulation signal generated by the signal processor 203 is a fluctuating signal with a certain rule, and the modulation signal also has the capability of driving the optical modulator 207 or the micro resonator 206.

In embodiment 2, the manner in which the signal processor 203 determines whether the optical link has a failure is different from the manner in which the signal processor 203 determines whether the optical link has a failure in embodiment 1, and the description is made below of whether the signal processor 203 determines whether the optical link has a failure based on the fifth optical signal or the sixth optical signal.

In an alternative embodiment, the signal processor 203 determines whether the optical link has a fault according to the information of the fifth optical signal, specifically for: if the peak value of the pulse of the fifth optical signal is smaller than the third value and larger than the fourth value, determining that the optical link has a fault; the third value is an amplitude threshold of the pulse in the fifth optical signal; the fourth value is the amplitude threshold of the noise in the fifth optical signal. The pulse of the fifth optical signal refers to a pulse in the electrical signal after the fifth optical signal is subjected to photoelectric conversion (and optional analog-to-digital conversion). Further, if the peak value of the pulse of the fifth optical signal is smaller than the third value and larger than the fourth value, it may be determined that there is a failure of the first optical module in the optical link, or that there is a failure in the optical fiber link connecting the first optical module and the optical link detection device.

The third value may be determined according to an average power of the optical signal having the first wavelength transmitted by the first optical module, and may specifically be equal to a value obtained by subtracting an insertion loss caused by each device passing through in a process of transmitting the optical signal from the first optical module to the optical link detection apparatus from the average power of the optical signal having the first wavelength transmitted by the first optical module. The fourth value may be determined from an optical signal to noise ratio (optical signal noise ratio, OSNR) of the fifth optical signal. The OSNR of the fifth optical signal may be affected by noise generated by the first optical module and the optical fiber link connecting the first optical module and the optical link detection device. The noise in the embodiment of the application can be white noise, thermal noise and other noise, and also can be interference caused by the nonlinearity of the optical signal.

In an alternative embodiment, the signal processor 203 determines whether the optical link has a fault according to the information of the sixth optical signal, which may be specifically: if the peak value of the pulse of the sixth optical signal is larger than the fifth value, determining that the optical link has a fault; the fifth value is an amplitude threshold of noise in the sixth optical signal. The pulse of the sixth optical signal refers to a pulse in the electrical signal after the sixth optical signal is subjected to photoelectric conversion (and optional analog-to-digital conversion). Further, if the peak value of the pulse of the sixth optical signal is greater than the fifth value, it may be determined that there is a failure of the second optical module in the optical link, or that there is a failure in the optical fiber link connecting the second optical module and the optical link detection device. Wherein the fifth value is determined based on an OSNR of the sixth optical signal, which is affected by noise generated by the first optical module, the optical fiber link connecting the first optical module and the second optical module.

Optionally, the signal processor 203 is further configured to determine a fault location of a corresponding fault point on the optical link according to a time delay of each pulse having a peak value greater than the fifth value in the sixth optical signal relative to the pulse of the fifth optical signal. The pulse with the peak value greater than the fifth value in the sixth optical signal refers to a pulse with the peak value greater than the fifth value in the electrical signal after the sixth optical signal is subjected to photoelectric conversion (and optional analog-to-digital conversion).

The delay of each pulse of the sixth optical signal with respect to the pulse of the fifth optical signal, where the peak value is greater than the fifth value, may be equal to the absolute difference between the time corresponding to the peak value in the pulse of the sixth optical signal, where the peak value is greater than the fifth value, and the time corresponding to the peak value in the pulse of the fifth optical signal. For example, the time corresponding to the peak in a pulse having a peak value larger than the fifth value is t ₁ The time corresponding to the peak value in the pulse of the fifth optical signal is t ₂ The delay of the pulse having a peak value larger than the fifth value in the sixth optical signal with respect to the pulse of the fifth optical signal is t= |t ₁ -t ₂ | a. The invention relates to a method for producing a fibre-reinforced plastic composite. According toThe manner of determining the fault location of the corresponding fault point of the pulse on the optical link can be referred to in the related description of embodiment 1, and will not be described herein.

Optionally, the signal processor 203 is further configured to determine a reflection loss of the pulse corresponding to the fault point on the optical link according to an amplitude value included in each pulse with a peak value greater than the fifth value in the sixth optical signal and an amplitude value included in the pulse of the fifth optical signal.

Specifically, each pulse in the sixth optical signal having a peak value greater than the fifth value has a corresponding point of failure on the optical link In dB. Wherein A is ₁ 、A ₂ 、…、A _i I amplitude values constituting the pulse having a peak value greater than a fifth value, the i amplitude values being all greater than the fifth value; b (B) ₁ 、B ₂ 、…、B _j J amplitude values of pulses constituting the fifth optical signal; i and j are both positive integers.

In summary, the optical link detection apparatus determines whether the optical link has a fault based on the optical signal modulated by the optical signal carrying the service data, where the optical link includes an optical module that transmits the optical signal carrying the service data, an optical fiber link that transmits the optical signal carrying the service data, and an optical module that receives the optical signal modulated by the optical signal carrying the service data. The optical link detection device is based on the optical signal after modulating the optical signal carrying the service data, and has higher sensitivity and stronger identification capability to micro faults (faults with smaller loss). In addition, the optical link detection device does not contain a light source, and the first light detector, the second light detector, the signal processor, the optional wavelength gating device, the optical add/drop multiplexer and the microresonator in the optical link detection device can be miniaturized, so that the optical link detection device can be miniaturized.

In embodiment 3, before the optical link detection device performs optical link detection, an optical module not belonging to the optical link detection device may cooperate to generate an optical pulse signal, so that the optical link detection device may perform optical link detection based on the optical pulse signal. For example, when the optical link detection device is applied to a forward optical network, the optical link detection device can cooperatively generate an optical pulse signal by an optical module in the BBU and send the optical pulse signal to the optical module in the RRU, and the optical link detection device can perform fault detection on the optical link (including the optical module in the BBU, an optical fiber link connecting the optical module in the BBU and the optical module in the RRU, and the optical module in the RRU) based on the optical pulse signal. The functions of the parts in the optical link detection apparatus shown in fig. 7 may also be as follows:

the first light detector 201 is configured to photoelectrically convert a tenth light signal to obtain information of the tenth light signal, and output the information of the tenth light signal to the signal processor 203, where the tenth light signal is an optical pulse signal from the third light module; the third optical module does not belong to the optical link detection device.

The second photodetector 202 is configured to photoelectrically convert an eleventh optical signal to obtain information of the eleventh optical signal, and output the information of the eleventh optical signal to the signal processor 203, where the eleventh optical signal is an optical signal obtained by reflecting the tenth optical signal through an optical fiber link, or an optical signal obtained by reflecting the tenth optical signal through an optical fiber link and a fourth optical module.

Optionally, the first light detector 201 and the second light detector 202 are determined based on a modulation format of the optical pulse signal, for example, if the modulation format of the optical pulse signal is light intensity modulation, the first light detector 201 and the second light detector 202 are detectors with light intensity detection function; if the modulation format of the optical pulse signal is phase modulation, the first optical detector 201 and the second optical detector 202 are detectors with an optical phase detection function.

The signal processor 203 is configured to determine whether the optical link has a fault according to the information of the tenth optical signal or the information of the eleventh optical signal, where the optical link includes a third optical module, an optical fiber link, and a fourth optical module.

In this embodiment, the manner in which the optical link detection device determines the tenth optical signal is similar to that in the embodiment 1, except that: the optical fiber link in embodiment 1 transmits an optical signal carrying service data, and the optical link detection device is a first optical signal determined from one or more optical signals carrying service data; the optical fiber link of embodiment 3 transmits an optical pulse signal, and the optical link detection means is a tenth optical signal determined from one or more optical pulse signals.

In addition, in this embodiment, the manner in which the signal processor 203 determines whether the optical link has a fault according to the information of the tenth optical signal or the information of the eleventh optical signal is similar to the manner in which the signal processor 203 determines whether the optical link has a fault according to the information of the fifth optical signal or the information of the sixth optical signal in embodiment 2, and is not repeated here.

In this embodiment, the optical link detection device performs optical link detection based on an optical pulse signal generated by an optical module not belonging to the optical link detection device, where the optical link includes the optical module not belonging to the optical link detection device, an optical fiber link, and an optical module that receives the optical pulse signal. The optical link detection device has higher sensitivity and stronger identification capability for micro faults (faults with smaller loss). In addition, the optical link detection device does not contain a light source, and the first light detector, the second light detector, the signal processor, the optional wavelength gating device, the optical add/drop multiplexer and the microresonator in the optical link detection device can be miniaturized, so that the optical link detection device can be miniaturized. In addition, the optical link detection device of embodiment 3 does not need to perform a modulation operation, and can reduce the complexity of the optical link detection device as compared with the optical link detection device of embodiment 2.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the optical link detection device. In other embodiments of the application, the optical link detection device may include more or less components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Fig. 13 is a flow chart of an optical link detection method 100 according to an embodiment of the present application, where the optical link detection method 100 may be performed by the optical link detection apparatus described in embodiment 1. The optical link detection method 100 may include the steps of:

s101, the optical link detection device performs photoelectric conversion on a first optical signal to obtain information of the first optical signal, wherein the first optical signal is an optical signal carrying service data from a first optical module.

S102, the optical link detection device performs photoelectric conversion on the second optical signal to obtain information of the second optical signal, wherein the second optical signal is an optical signal obtained by reflecting the first optical signal through the optical fiber link or an optical signal obtained by reflecting the first optical signal through the optical fiber link and the second optical module.

In an alternative embodiment, the optical link detection method 100 further includes: the optical link detection device determines a first optical signal from third optical signals according to the first wavelength and determines a second optical signal from fourth optical signals according to the first wavelength, wherein the third optical signals comprise the first optical signals; the fourth optical signal includes the second optical signal, and the fourth optical signal is an optical signal reflected by the third optical signal through the optical fiber link, or an optical signal reflected by the third optical signal through the optical fiber link and an optical module that receives the third optical signal. Optionally, before the optical link detection device determines the first optical signal from the third optical signal according to the first wavelength and determines the second optical signal from the fourth optical signal according to the first wavelength, the optical link detection method 100 may further include: and acquiring a third optical signal and a fourth optical signal based on the add/drop multiplexing structure.

S103, the optical link detection device determines whether the optical link has faults according to the information of the first optical signal or the information of the first optical signal and the information of the second optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module.

In an alternative embodiment, the optical link detecting device determines whether the optical link has a fault according to the information of the first optical signal, including: and when the average power corresponding to the information of the first optical signal is smaller than a first value, determining that the optical link has a fault, wherein the first value is a power threshold value of the first optical signal. Alternatively, when the average power corresponding to the information of the first optical signal is smaller than the first value, it may be determined that the first optical module is faulty, or it may be determined that an optical fiber link connecting the first optical module and the optical link detection device is faulty.

In an alternative embodiment, the optical link detecting device determines whether the optical link has a fault according to the information of the first optical signal and the information of the second optical signal, including: calculating a cross-correlation function of the amplitude information of the first optical signal subjected to photoelectric conversion and the amplitude information of the second optical signal subjected to photoelectric conversion to obtain one or more cross-correlation coefficients; if there is a cross correlation coefficient of the one or more cross correlation coefficients that is greater than a second value, the optical link is determined to be faulty, wherein the first value is an amplitude threshold determined based on noise in the first optical signal and noise in the second optical signal. Alternatively, if there is a cross correlation coefficient greater than the second value in the one or more cross correlation coefficients, it may be determined that the second optical module is malfunctioning, or that an optical fiber link connecting the second optical module and the optical link detection device is malfunctioning.

Optionally, the optical link detection method 100 further includes: the optical link detection device determines the position of the fault point on the optical link according to the moment corresponding to each cross-correlation coefficient greater than the second value in the one or more cross-correlation coefficients.

Optionally, the optical link detection method 100 further includes: the optical link detection means determines a reflection loss at a point of failure on the optical link based on a value of each of the one or more cross-correlation coefficients that is greater than the second value.

In addition, the optical link detection apparatus may also periodically execute the optical link detection method 100, and may obtain a failure trend at any position on the optical link based on the average power corresponding to the information of the first optical signal and one or more cross correlation coefficients obtained by executing the optical link detection method 100 each time. For example, in the process of performing the optical link detection method 100 multiple times, the cross correlation coefficient corresponding to a certain position in the optical fiber link connecting the second optical module and the optical link detection device increases gradually, which indicates that the position has a tendency to fail. The method is favorable for timely removing faults so as to ensure normal service communication between the first optical module and the second optical module.

The optical link detection method 100 may further include any implementation manner of the optical link detection device described in embodiment 1, which is not described herein.

In summary, in the optical link detection method 100, the optical link detection device determines whether the optical link has a fault based on the optical signal carrying the service data, where the optical link includes a first optical module that sends the optical signal carrying the service data, an optical fiber link that transmits the optical signal carrying the service data, and a second optical module that receives the optical signal carrying the service data. Therefore, the optical link detection method 100 can detect the optical link in the process of performing service communication between the first optical module and the second optical module, and does not cause interference to the service communication between the first optical module and the second optical module, so that online communication can be realized.

Fig. 14 is a flowchart of an optical link detection method 200 according to an embodiment of the present application, where the optical link detection method 200 may be performed by the optical link detection apparatus described in embodiment 2. The optical link detection method 200 may include the steps of:

s201, the optical link detection device performs photoelectric conversion on a fifth optical signal to obtain information of the fifth optical signal, wherein the fifth optical signal is obtained by modulating a first optical signal, and the first optical signal is an optical signal carrying service data from a first optical module.

S202, the optical link detection device performs photoelectric conversion on a sixth optical signal to obtain information of the sixth optical signal, wherein the sixth optical signal is an optical signal obtained by reflecting the fifth optical signal through an optical fiber link or an optical signal obtained by reflecting the fifth optical signal through the optical fiber link and a second optical module.

S203, the optical link detection device determines whether the optical link has a fault according to the information of the fifth optical signal or the information of the sixth optical signal, wherein the optical link comprises a first optical module, an optical fiber link and a second optical module.

In an alternative embodiment, the optical link detection method 200 further includes: the optical link detection device determines a fifth optical signal from the seventh optical signal according to the first wavelength and determines a sixth optical signal from the eighth optical signal according to the first wavelength, wherein the seventh optical signal comprises the fifth optical signal; the eighth optical signal includes a sixth optical signal, and the eighth optical signal is an optical signal reflected by the seventh optical signal through the optical fiber link or an optical signal reflected by the seventh optical signal through the optical fiber link and an optical module that receives the seventh optical signal. Optionally, before the optical link detection device determines the fifth optical signal from the seventh optical signal according to the first wavelength and determines the sixth optical signal from the eighth optical signal according to the first wavelength, the optical link detection method 100 may further include: and acquiring a seventh optical signal and an eighth optical signal based on the add/drop multiplexing structure.

Optionally, the optical link detection method 200 further includes: the optical link detection device modulates the ninth optical signal to obtain a modulated ninth optical signal, wherein the ninth optical signal comprises the first optical signal, and the modulated ninth optical signal comprises the seventh optical signal. The optical link detection apparatus obtains a seventh optical signal and an eighth optical signal based on an add/drop multiplexing structure, and may include: acquiring a part of optical signals from the modulated ninth optical signals based on the add/drop multiplexing structure as seventh optical signals; and acquiring part of the optical signal from the optical signal obtained by reflecting the modulated ninth optical signal on the optical fiber link as an eighth optical signal, or acquiring part of the optical signal from the optical signal obtained by reflecting the modulated ninth optical signal on the optical fiber link and the optical module for receiving the modulated ninth optical signal as the eighth optical signal.

In an alternative embodiment, the optical link detecting device determines whether the optical link has a fault according to the information of the fifth optical signal, which may include: if the peak value of the pulse of the fifth optical signal is smaller than the third value and larger than the fourth value, determining that the optical link has a fault; the third value is an amplitude threshold of the pulse in the fifth optical signal; the fourth value is the amplitude threshold of the noise in the fifth optical signal. Further, if the peak value of the pulse of the fifth optical signal is smaller than the third value and larger than the fourth value, it may be determined that the first optical module is malfunctioning, or that an optical fiber link connecting the first optical module and the optical link detection device is malfunctioning.

In an alternative embodiment, the optical link detecting device determines whether the optical link has a fault according to the information of the sixth optical signal, which may include: if the peak value of the pulse of the sixth optical signal is larger than the fifth value, determining that the optical link has a fault; the fifth value is an amplitude threshold of noise in the sixth optical signal. Further, if the peak value of the pulse of the sixth optical signal is greater than the fifth value, it may be determined that the second optical module is malfunctioning, or that an optical fiber link connecting the second optical module and the optical link detection device is malfunctioning.

Optionally, the optical link detection method 200 further includes: the optical link detection device determines the fault position of the corresponding fault point on the optical link according to the time delay of each pulse with the peak value larger than the fifth value in the sixth optical signal relative to the pulse of the fifth optical signal.

Optionally, the optical link detection method 200 further includes: the optical link detection device determines the reflection loss of the pulse corresponding to the fault point on the optical link according to the amplitude value included in each pulse with the peak value larger than the fifth value in the sixth optical signal and the amplitude value included in the pulse of the fifth optical signal.

In addition, the optical link detection device may also periodically execute the optical link detection method 200, and based on the information of the fifth optical signal and the information of the sixth optical signal obtained by executing the optical link detection method 200 each time, a failure trend of any position on the optical link may be obtained, which is beneficial to timely removing the failure to ensure normal service communication between the first optical module and the second optical module.

The optical link detection method 200 may further include any implementation manner that the optical link detection device described in embodiment 2 may perform, which is not described herein.

In summary, in the optical link detection method 200, the optical link detection device determines whether the optical link has a fault based on the optical signal modulated by the optical signal carrying the service data, where the optical link includes an optical module that transmits the optical signal carrying the service data, an optical fiber link that transmits the optical signal carrying the service data, and an optical module that receives the optical signal modulated by the optical signal carrying the service data. The optical link detection device can detect the optical link based on the optical signal modulated by the optical signal carrying the service data, and has high sensitivity and strong capability of identifying the micro fault (the fault with smaller loss).

Fig. 15 is a flow chart of an optical link detection method 300 according to an embodiment of the present application, and the optical link detection method 300 may be performed by the optical link detection apparatus according to embodiment 3. The optical link detection method 300 may include the steps of:

s301, the optical link detection device performs photoelectric conversion on a tenth optical signal to obtain information of the tenth optical signal, wherein the tenth optical signal is an optical pulse signal from a third optical module; the third optical module does not belong to the optical link detection device.

S302, the optical link detection device performs photoelectric conversion on an eleventh optical signal to obtain information of the eleventh optical signal, where the eleventh optical signal is an optical signal obtained by reflecting the tenth optical signal through an optical fiber link, or an optical signal obtained by reflecting the tenth optical signal through the optical fiber link and a fourth optical module.

S303, the optical link detection device determines whether the optical link has a fault according to the information of the tenth optical signal or the information of the eleventh optical signal, wherein the optical link comprises a third optical module, an optical fiber link and a fourth optical module.

In an alternative embodiment, the optical link detection method 300 further includes: the optical link detection device determines a tenth optical signal from the twelfth optical signal according to the second wavelength, and determines an eleventh optical signal from the thirteenth optical signal according to the second wavelength, wherein the twelfth optical signal comprises the tenth optical signal; the thirteenth optical signal includes an eleventh optical signal, and the thirteenth optical signal is an optical signal obtained by reflecting the twelfth optical signal through the optical fiber link, or an optical signal obtained by reflecting the twelfth optical signal through the optical fiber link and an optical module that receives the twelfth optical signal.

Optionally, before the optical link detection device determines the tenth optical signal from the twelfth optical signal according to the second wavelength and determines the eleventh optical signal from the thirteenth optical signal according to the second wavelength, the optical link detection method 100 may further include: the twelfth optical signal and the thirteenth optical signal are acquired based on the add/drop multiplexing structure.

In an alternative embodiment, the optical link detecting device determines whether the optical link has a fault according to the information of the tenth optical signal, including: if the peak value of the pulse of the tenth optical signal is smaller than the sixth value and larger than the seventh value, determining that the optical link has a fault; the fifth value is the amplitude threshold of the pulses in the tenth optical signal; the sixth value is the amplitude threshold of the noise in the tenth optical signal. Alternatively, if the peak value of the pulse of the tenth optical signal is smaller than the sixth value and larger than the seventh value, it may be determined that the third optical module is malfunctioning, or it may be determined that an optical fiber link connecting the third optical module and the optical link detection device is malfunctioning.

In an alternative embodiment, the optical link detecting device determines whether the optical link has a fault according to the information of the eleventh optical signal, including: if the peak value of the pulse of the eleventh optical signal is larger than the eighth value, determining that the optical link has a fault; the eighth value is an amplitude threshold of noise in the eleventh optical signal. Alternatively, if the peak value of the pulse of the eleventh optical signal is greater than the eighth value, it may be determined that the fourth optical module is malfunctioning, or that the optical fiber link connecting the fourth optical module and the optical link detection device is malfunctioning.

Optionally, the optical link detection method 300 further includes: the optical link detection device determines the fault position of the corresponding fault point on the optical link according to the time delay of each pulse with the peak value larger than the eighth value in the eleventh optical signal relative to the pulse of the tenth optical signal.

Optionally, the optical link detection method 300 further includes: the optical link detection device determines the reflection loss of the pulse corresponding to the fault point on the optical link according to the amplitude value included in each pulse with the peak value larger than the eighth value in the eleventh optical signal and the amplitude value included in the pulse of the tenth optical signal.

In addition, the optical link detection device may also periodically execute the optical link detection method 300, and based on the information of the tenth optical signal and the information of the eleventh optical signal obtained by executing the optical link detection method 300 each time, a failure trend of any position on the optical link may be obtained, which is favorable for timely removing the failure, so as to ensure normal service communication between the first optical module and the second optical module.

The optical link detection method 300 may further include any implementation manner of the optical link detection device described in embodiment 3, which is not described herein.

In summary, in the optical link detection method 300, when the optical link detection device performs optical link detection, the optical link detection device may perform optical link detection based on the optical pulse signal, where the optical link includes the optical module not belonging to the optical link detection device, the optical fiber link, and the optical module receiving the optical pulse signal. The optical link detection method based on the optical pulse signals has high sensitivity and strong identification capability on micro faults (faults with smaller loss). And, the optical link detection apparatus in the optical link detection method 300 also does not need to perform the operation of modulation, which reduces the complexity of the optical link detection apparatus, compared to the optical link detection method 200.

It will be appreciated that, in order to implement the functions of the above method, the optical link detection device includes a hardware structure and/or a software module that performs the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application scenario and design constraints imposed on the solution.

In addition to the structures of the optical link detection devices shown in fig. 7, 8, 11 and 12, possible structures of the optical link detection devices may be as shown in fig. 16 and 17. The optical link detection device shown in fig. 16 and 17 may be used to implement the functions of the optical link detection device in the above-described method embodiment, so that the beneficial effects of the above-described method embodiment may also be implemented.

As shown in fig. 16, the optical link detection apparatus 1600 includes a photoelectric conversion unit 1601 and a determination unit 1602. The optical link detection device 1600 is configured to implement the functions of the optical link detection device in the method embodiments shown in fig. 13, 14 or 15.

When the optical link detection apparatus 1600 is used to implement the functionality of the optical link detection apparatus in the method embodiment shown in fig. 13: the photoelectric conversion unit 1601 is configured to perform photoelectric conversion on a first optical signal to obtain information of the first optical signal, where the first optical signal is an optical signal from the first optical module that carries service data; and carrying out photoelectric conversion on the second optical signal to obtain information of the second optical signal, wherein the second optical signal is an optical signal obtained by reflecting the first optical signal through an optical fiber link or an optical signal obtained by reflecting the first optical signal through the optical fiber link and a second optical module. The determining unit 1602 is configured to determine whether an optical link has a fault according to information of the first optical signal or according to information of the first optical signal and information of the second optical signal, where the optical link includes the first optical module, the optical fiber link, and the second optical module.

When the optical link detection apparatus 1600 is used to implement the functionality of the optical link detection apparatus in the method embodiment shown in fig. 14: the photoelectric conversion unit 1601 is configured to perform photoelectric conversion on a fifth optical signal to obtain information of the fifth optical signal, where the fifth optical signal is obtained by modulating a first optical signal, and the first optical signal is an optical signal from a first optical module that carries service data; and carrying out photoelectric conversion on the sixth optical signal to obtain information of the sixth optical signal, wherein the sixth optical signal is an optical signal obtained by reflecting the fifth optical signal through an optical fiber link or an optical signal obtained by reflecting the fifth optical signal through the optical fiber link and a second optical module. The determining unit 1602 is configured to determine whether the optical link has a fault according to the information of the fifth optical signal or the information of the sixth optical signal, where the optical link includes a first optical module, an optical fiber link, and a second optical module.

When the optical link detection apparatus 1600 is used to implement the functionality of the optical link detection apparatus in the method embodiment shown in fig. 15: the photoelectric conversion unit 1601 is configured to perform photoelectric conversion on a tenth optical signal, to obtain information of the tenth optical signal, where the tenth optical signal is an optical pulse signal from the third optical module; the third optical module does not belong to the optical link detection device; and performing photoelectric conversion on the eleventh optical signal to obtain information of the eleventh optical signal, wherein the eleventh optical signal is an optical signal obtained by reflecting the tenth optical signal through an optical fiber link or an optical signal obtained by reflecting the tenth optical signal through the optical fiber link and a fourth optical module. The determining unit 1602 is configured to determine whether the optical link has a fault according to the information of the tenth optical signal or the information of the eleventh optical signal, where the optical link includes a third optical module, an optical fiber link, and a fourth optical module.

For more detailed description about the above-described photoelectric conversion unit 1601 and determination unit 1602, reference may be made to related description in the method embodiment.

As shown in fig. 17, the optical link detection apparatus 1700 includes a processor 1701 and an interface circuit 1702. The processor 1701 and the interface circuit 1702 are coupled to each other. It is understood that the interface circuit 1702 may be a transceiver or an input-output interface. Optionally, the optical link detection apparatus 1700 may further comprise a memory 1703 for storing instructions for execution by the processor 1701 or for storing input data required by the processor 1701 to execute instructions or for storing data generated after the processor 1701 executes instructions.

When the optical link detecting apparatus 1700 is used to implement the method shown in fig. 13, 14, or 15, the processor 1701 is used to implement the functions of the photoelectric conversion unit 1601 and the determining unit 1602 described above.

It is to be appreciated that the processor in embodiments of the application may be a central processing unit (central processing unit, CPU), other general purpose processor, digital signal processor (digital signal processor, DSP), application specific integrated circuit (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic device, transistor logic device, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

The method steps of the embodiments of the present application may be implemented in hardware or in software instructions executable by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory, flash memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. The storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a base station or terminal. The processor and the storage medium may reside as discrete components in a base station or terminal.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as digital video discs; but also semiconductor media such as solid state disks. The computer readable storage medium may be volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage medium.

In various embodiments of the application, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/", generally indicates that the associated objects are an or relationship; in the formula of the present application, the character "/" indicates that the front and rear associated objects are a "division" relationship. "including at least one of A, B and C" may mean: comprises A; comprises B; comprising C; comprises A and B; comprises A and C; comprises B and C; including A, B and C.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.

Claims

1. An optical link detection method, the method comprising:

photoelectric conversion is carried out on a first optical signal to obtain information of the first optical signal, wherein the first optical signal is an optical signal carrying service data from a first optical module;

performing photoelectric conversion on a second optical signal to obtain information of the second optical signal, wherein the second optical signal is an optical signal obtained by reflecting the first optical signal through an optical fiber link or an optical signal obtained by reflecting the first optical signal through an optical fiber link and a second optical module;

and determining whether an optical link has a fault according to the information of the first optical signal or the information of the first optical signal and the information of the second optical signal, wherein the optical link comprises the first optical module, the optical fiber link and the second optical module.

2. The method according to claim 1, wherein the method further comprises:

determining the first optical signal from a third optical signal according to a first wavelength, wherein the third optical signal comprises the first optical signal;

and determining the second optical signal from a fourth optical signal according to the first wavelength, wherein the fourth optical signal comprises the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through the optical fiber link or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module for receiving the third optical signal.

3. The method of claim 2, wherein the third optical signal and the fourth optical signal are acquired based on an add/drop multiplexing architecture.

4. A method according to any one of claims 1 to 3, wherein determining whether an optical link is faulty based on the information of the first optical signal comprises:

and when the average power corresponding to the information of the first optical signal is smaller than a first value, determining that the optical link has a fault, wherein the first value is a power threshold value of the first optical signal.

5. The method according to any one of claims 1 to 4, wherein determining whether an optical link has a failure based on the information of the first optical signal and the information of the second optical signal comprises:

calculating a cross-correlation function of the amplitude information of the first optical signal subjected to photoelectric conversion and the amplitude information of the second optical signal subjected to photoelectric conversion to obtain one or more cross-correlation coefficients;

determining that the optical link is faulty if there is a cross-correlation coefficient of the one or more cross-correlation coefficients that is greater than a second value, wherein the second value is an amplitude threshold determined based on noise in the first optical signal and noise in the second optical signal.

6. The method of claim 5, wherein the method further comprises:

and determining the position of the fault point on the optical link according to the moment corresponding to each cross-correlation coefficient greater than the second value in the one or more cross-correlation coefficients.

7. The method according to claim 5 or 6, characterized in that the method further comprises:

and determining the reflection loss of the fault point on the optical link according to the value of each cross-correlation coefficient greater than the second value in the one or more cross-correlation coefficients.

8. An optical link detection apparatus, the apparatus comprising:

the first optical detector is used for carrying out photoelectric conversion on a first optical signal to obtain information of the first optical signal, and outputting the information of the first optical signal to the signal processor, wherein the first optical signal is an optical signal carrying service data from a first optical module;

the second optical detector is used for carrying out photoelectric conversion on a second optical signal to obtain information of the second optical signal, and outputting the information of the second optical signal to the signal processor, wherein the second optical signal is an optical signal obtained by reflecting the first optical signal through an optical fiber link or an optical signal obtained by reflecting the first optical signal through the optical fiber link and a second optical module;

The signal processor is configured to determine whether an optical link has a fault according to information of the first optical signal or according to information of the first optical signal and information of the second optical signal, where the optical link includes the first optical module, the optical fiber link, and the second optical module.

9. The apparatus of claim 8, further comprising a wavelength gate to determine the first optical signal from a third optical signal based on a first wavelength and output the first optical signal to the first photodetector, wherein the third optical signal comprises the first optical signal;

the wavelength gating device is further configured to determine the second optical signal from a fourth optical signal according to the first wavelength, and output the second optical signal to the second optical detector, where the fourth optical signal includes the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through the optical fiber link, or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module that receives the third optical signal.

10. The apparatus of claim 9, further comprising an optical add/drop multiplexer having an add/drop multiplexing structure;

The optical add/drop multiplexer is configured to obtain the third optical signal and the fourth optical signal, and output the third optical signal and the fourth optical signal to the wavelength gate.

11. The apparatus of claim 8, further comprising a microresonator to determine the first optical signal from a third optical signal based on a first wavelength and to output the first optical signal to the first photodetector, wherein the third optical signal comprises the first optical signal;

the micro resonator is further configured to determine the second optical signal from a fourth optical signal according to the first wavelength, and output the second optical signal to the second optical detector, where the fourth optical signal includes the second optical signal, and the fourth optical signal is an optical signal obtained by reflecting the third optical signal through the optical fiber link, or an optical signal obtained by reflecting the third optical signal through the optical fiber link and an optical module that receives the third optical signal.

12. The apparatus of claim 11, wherein the microresonator has an add/drop multiplexing structure, the microresonator further configured to acquire the third optical signal and the fourth optical signal.

13. The apparatus according to any one of claims 8 to 12, wherein the signal processor is configured to determine whether there is a failure in the optical link based on the information of the first optical signal, specifically configured to: and when the average power corresponding to the information of the first optical signal is smaller than a first value, determining that the optical link has a fault, wherein the first value is a power threshold value of the first optical signal.

14. The apparatus according to any one of claims 8 to 13, wherein the signal processor is configured to determine whether there is a failure in the optical link based on the information of the first optical signal and the information of the second optical signal, in particular:

15. The apparatus of claim 14, wherein the device comprises a plurality of sensors,

The signal processor is further configured to determine a location of a fault point on the optical link according to a time corresponding to each cross-correlation coefficient greater than a second value of the one or more cross-correlation coefficients.

16. The device according to claim 14 or 15, wherein,

the signal processor is further configured to determine a reflection loss at a failure point on the optical link based on a value of each of the one or more cross-correlation coefficients that is greater than a second value.

17. An optical link detection device is characterized by comprising a memory and a processor;

the memory is used for storing instructions or computer programs;

the processor being configured to execute a computer program or instructions stored in the memory to cause the optical link detection device to perform the method of any one of claims 1 to 7.

18. A computer readable storage medium storing a computer program which, when run on an optical link detection apparatus, causes the optical link detection apparatus to perform the method of any one of claims 1 to 7.