CN118233018A

CN118233018A - Method for positioning MPI (Multi-processor interface) and related equipment

Info

Publication number: CN118233018A
Application number: CN202211634072.2A
Authority: CN
Inventors: 尚冬冬
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2024-06-21

Abstract

The embodiment of the application discloses a method and related equipment for positioning MPI (multi-point interface), which are used for positioning the position where the MPI appears in an optical fiber link so as to carry out manual cleaning. The method of the embodiment of the application comprises the following steps: the MCU acquires a first noise signal according to the signal output by the equalizer. The MCU determines the sign of the window-jump average of the first noise signal. The MCU multiplies the first noise signal with the sign to obtain a second noise signal. The MCU determines a reflection distance from the second noise signal, the reflection distance being used to indicate a distance between two fiber connection points in the fiber link that result in the MPI.

Description

Method for positioning MPI (Multi-processor interface) and related equipment

Technical Field

The embodiment of the application relates to the field of optical communication, in particular to a method for positioning MPI and related equipment.

Background

Multipath interference (MPI), which is the interference generated by optical signals reflected back and forth between fiber optic connection points, tends to be present in fiber optic links. If MPI is too large, the error rate is easy to rise, and even communication is interrupted.

In the prior art, the size of the MPI can be determined by the received optical power and the error rate, however, the position generated by the MPI cannot be accurately located.

Disclosure of Invention

The application provides a method and related equipment for positioning MPI, which are used for positioning the position where the MPI appears in an optical fiber link so as to carry out manual cleaning.

The first aspect of the present application provides a method for locating MPI:

The micro-processing unit (microcontroller unit, MCU) acquires a first noise signal according to the signal output by the equalizer, the MCU and the equalizer are arranged on the first optical network device, an optical fiber link is arranged between the first optical network device and the second optical network device, and the equalizer is used for processing the signal sent by the second optical network device through the optical fiber link. The MCU determines a sign of a window-jump average of the first noise signal, and the MCU multiplies the first noise signal by the sign to obtain a second noise signal. The MCU determines a reflection distance from the second noise signal, the reflection distance being used to indicate a distance between two fiber connection points in the fiber link that result in the MPI.

In the application, the phase of the main path light and the phase of the reflected light in the optical fiber link are compatible, when the phases are compatible, the first noise signal and the signal sent by the second network equipment are positively correlated, when the phases are compatible, the first noise signal and the signal sent by the second network equipment are negatively correlated, and when the characteristics of the positive correlation and the negative correlation of the first noise signal exist simultaneously, the correlation of the first noise signal and the signal sent by the second network equipment is destroyed. By multiplying the first noise signal by the sign of the average value of the skip window, the data in positive correlation in the first noise signal can be kept unchanged, and the data in negative correlation is converted into positive correlation, so that the second noise signal and the signal sent by the second network equipment are guaranteed to have correlation. Therefore, the reflection distance can be accurately calculated based on the second noise signal, and the MPI can be positioned by combining networking information of the optical fiber link.

In one possible implementation, the MCU determines two fiber connection points based on the reflection distance and networking information of the fiber links, including the distance between the fiber connection points in the fiber links.

In the application, the MCU can determine two optical fiber connection points which lead to MPI according to the reflection distance and networking information by itself, so that the resources of other equipment are not required to be consumed.

In one possible implementation, the MCU sends the reflection distance to the network management system, so that the network management system determines two optical fiber connection points according to the reflection distance and networking information of the optical fiber link, where the networking information includes a distance between the optical fiber connection points in the optical fiber link.

In the application, the network management system determines two optical fiber connection points which lead to MPI according to the reflection distance and the networking information, thereby not consuming MCU resources.

In one possible implementation, the MCU correlates the second noise signal with a target signal to obtain a first correlation peak position, where the target signal is a decision signal obtained according to a signal output by the equalizer, or a signal sent by the second optical network device to the first optical network device, and the second optical network device sends the signal based on the first sending period. The MCU instructs the first optical network device to transmit signals based on the second transmission period through the backhaul channel so as to acquire a second correlation peak position corresponding to the second transmission period. The MCU determines the reflection distance according to the first correlation peak position, the second correlation peak position, the first transmission period, the second transmission period and the Chinese remainder theorem.

In the application, the reflection distance can be obtained according to the remainder theorem by combining each transmission period of the first optical network equipment and the corresponding correlation peak position, thereby improving the feasibility of the scheme.

In one possible implementation, the MCU correlates the second noise signal with the target delay, multiplies the target delay by the speed of light if a correlation peak occurs, to determine the reflection distance, where the target signal is a decision signal obtained from the signal output by the equalizer.

In the application, the MCU can also determine the reflection distance according to the second noise signal with the target delay and the target signal, without changing the transmission period of the first optical network equipment and affecting the normal service.

In one possible implementation, the MCU correlates the second noise signal with the target signal and also obtains the first correlation peak height. The MCU further acquires a first magnitude value of the MPI according to the first correlation peak height, and instructs the first optical network device to transmit signals based on the second transmission period and further acquires a second correlation peak height corresponding to the second transmission period. The MCU also obtains a second magnitude of MPI based on the second correlation peak height.

In the application, the MCU can also acquire the size of the MPI, thereby further defining the condition of the MPI.

In one possible implementation, the MCU obtains a decision signal from the equalizer output signal, and the MCU subtracts the decision signal from the equalizer output signal to obtain the first noise signal.

In one possible implementation, the MCU multiplies the first noise signal with the sign and performs a blocking process to obtain a second noise signal.

The second aspect of the present application provides a method of determining a fiber link:

The network management system receives a reflection distance from the first optical network device, the first optical network device is connected with a target optical fiber link of the second optical network device, the reflection distance is determined by the first optical network device according to a signal transmitted from the target optical fiber link, and the reflection distance is used for indicating a distance between two optical fiber connection points which lead to MPI in the target optical fiber link. And the network management system determines the optical fiber link which is matched with the reflection distance between the two optical fiber connection points of the MPI and is caused to be the target optical fiber link in a plurality of optical fiber links in the second optical network equipment.

In the application, the network management system can directly determine the target optical fiber link in the second optical network equipment according to the reflection distance reported by the first optical network equipment and by combining the optical fiber link condition of the second optical network equipment.

A third aspect of the present application provides a method of determining an idle port:

The network management system receives reflection distances from a plurality of first optical network devices, the plurality of first optical network devices are respectively connected with different optical fiber links of the second optical network device, the reflection distances are determined by the first optical network devices according to signals transmitted from the optical fiber links, and the reflection distances are used for indicating the distances between two optical fiber connection points which lead to MPI in the optical fiber links. If the reflection distances of the plurality of first optical network devices all comprise the target distance, the network management system determines that the target optical fiber link of the second optical network device has an idle port, and the target distance is the distance between two optical fiber connection points, which lead to the MPI, in the target optical fiber link.

According to the application, the network management system can directly determine that the idle port exists in the target optical fiber link in the second optical network device according to the reflection distances reported by the plurality of first optical network devices and by combining the optical fiber link condition of the second optical network device.

A fourth aspect of the present application provides an MCU:

The acquisition unit is used for acquiring a first noise signal according to the signal output by the equalizer, the MCU and the equalizer are arranged on the first optical network equipment, an optical fiber link is arranged between the first optical network equipment and the second optical network equipment, and the equalizer is used for processing the signal sent by the second optical network equipment through the optical fiber link. And the processing unit is used for determining the sign of the jump window average value of the first noise signal. The processing unit is further configured to multiply the first noise signal with the sign to obtain a second noise signal. The processing unit is further configured to determine a reflection distance according to the second noise signal, where the reflection distance is used to indicate a distance between two optical fiber connection points in the optical fiber link that result in the MPI.

In a possible implementation, the processing unit is further configured to determine two optical fiber connection points according to the reflection distance and networking information of the optical fiber link, where the networking information includes a distance between the optical fiber connection points in the optical fiber link.

In one possible implementation, the MCU further includes a transmitting unit. And the sending unit is used for sending the reflection distance to the network management system so that the network management system can determine two optical fiber connection points according to the reflection distance and networking information of the optical fiber links, wherein the networking information comprises the distance between the optical fiber connection points in the optical fiber links.

In one possible implementation manner, the processing unit is specifically configured to correlate the second noise signal with a target signal to obtain a first correlation peak position, where the target signal is a decision signal obtained according to a signal output by the equalizer, or a signal sent by the second optical network device to the first optical network device, and the second optical network device sends the signal based on the first sending period.

The processing unit is further configured to instruct, through the backhaul channel, the first optical network device to transmit a signal based on the second transmission period, so as to obtain a second correlation peak position corresponding to the second transmission period.

The processing unit is further configured to determine the reflection distance according to the first correlation peak position, the second correlation peak position, the first transmission period, the second transmission period, and the chinese remainder theorem.

In one possible implementation manner, the processing unit is specifically configured to correlate the second noise signal with the target delay with the target signal, and multiply the target delay with the speed of light if a correlation peak occurs, so as to determine the reflection distance, where the target signal is a decision signal obtained according to the signal output by the equalizer.

In one possible implementation, the processing unit correlates the second noise signal with the target signal and also obtains the first correlation peak height. The processing unit is further configured to obtain a first magnitude value of the MPI according to the first correlation peak height. The processing unit instructs the first optical network device to transmit a signal based on the second transmission period, and further obtains a second correlation peak height corresponding to the second transmission period. The processing unit is further configured to obtain a second magnitude value of MPI based on the second correlation peak height.

In a possible implementation manner, the acquiring unit is specifically configured to acquire the decision signal according to the signal output by the equalizer.

And the acquisition unit is also used for subtracting the decision signal from the signal output by the equalizer so as to acquire a first noise signal.

In a possible implementation, the processing unit is specifically configured to multiply the first noise signal with the sign and perform a blocking process to obtain the second noise signal.

A fourth aspect of the present application provides a network management system:

And the receiving unit is used for receiving the reflection distance from the first optical network equipment, wherein the first optical network equipment is connected with the target optical fiber link of the second optical network equipment, the reflection distance is determined by the first optical network equipment according to the signal transmitted from the target optical fiber link, and the reflection distance is used for indicating the distance between two optical fiber connection points which lead to the MPI in the target optical fiber link. And the determining unit is used for determining an optical fiber link which is matched with the reflection distance in the distance between two optical fiber connection points of the MPI and is used as a target optical fiber link in a plurality of optical fiber links in the second optical network equipment.

The fifth aspect of the present application provides a network management system:

The receiving unit is used for receiving reflection distances from a plurality of first optical network devices, the plurality of first optical network devices are respectively connected with different optical fiber links of the second optical network device, the reflection distances are determined by the first optical network device according to signals transmitted from the optical fiber links, and the reflection distances are used for indicating the distances between two optical fiber connection points which lead to MPI in the optical fiber links. And the determining unit is used for determining that the idle port exists in the target optical fiber link of the second optical network equipment if the reflection distances of the plurality of first optical network equipment all comprise target distances, wherein the target distances are the distances between two optical fiber connection points which lead to the MPI in the target optical fiber link.

A sixth aspect of the present application provides an optical network device comprising the MCU of the first aspect.

A seventh aspect of the application provides an MCU comprising a processor and a memory, the processor being coupled to the memory, which when executing a program in the memory, causes the MCU to perform the method of the first aspect.

An eighth aspect of the present application provides a network management system comprising a processor and a memory, the processor being coupled to the memory, which when executed by the processor causes the network management system to perform the method of the second or third aspect.

A ninth aspect of the application provides a computer readable storage medium having a program stored therein, which when executed by a computer, performs a method as in any of the preceding aspects.

A tenth aspect of the application provides a computer program product which, when executed on a computer, performs the method of any of the preceding aspects.

Drawings

FIG. 1a is a schematic diagram of MPI;

FIG. 1b is a flow chart of determining the size of MPI in the prior art;

FIG. 1c is a schematic diagram of an operation and maintenance flow when MPI occurs in the prior art;

FIG. 1d is a flow chart of determining the position of MPI in the prior art;

FIG. 2 is a schematic diagram of a system architecture employed in the present application;

FIG. 3 is another schematic diagram of a system architecture according to the present application;

FIG. 4 is a flow chart of a method of locating MPI in the present application;

FIG. 5 is a schematic diagram of a signal processing flow in the present application;

FIG. 6a is a schematic diagram of phase recovery in the present application;

FIG. 6b is a schematic diagram of correlation peaks in the present application;

FIG. 7 is a mapping relationship between the height of correlation peak and the size of MPI in the present application;

FIG. 8 is a flow chart of the method for determining the reflection distance according to the Chinese remainder theorem;

FIG. 9 is a diagram of networking information according to the present application;

FIG. 10 is a schematic diagram of a scenario in which MPI location is determined according to the present application;

FIG. 11 is a schematic diagram of a system architecture to which the method for determining fiber links of the present application is applied;

FIG. 12 is a flow chart of a method for determining fiber links according to the present application;

FIG. 13 is a schematic diagram of another system architecture to which the method for determining fiber links of the present application is applied;

FIG. 14 is a schematic diagram of a system architecture to which the method for determining an idle port of the present application is applied;

FIG. 15 is a flow chart of a method for determining an idle port according to the present application;

FIG. 16 is a schematic diagram of the MCU of the present application;

fig. 17 is a schematic diagram of a network management system according to the present application;

Fig. 18 is a schematic diagram of another structure of a network management system according to the present application;

Fig. 19 is a schematic view of a structure of the apparatus of the present application.

Detailed Description

Embodiments of the present application will now be described with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the present application. As one of ordinary skill in the art can appreciate, with the development of technology and the appearance of new scenes, the technical scheme provided by the application is also applicable to similar technical problems.

The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1a, in an optical fiber link connecting two optical network devices, there are a plurality of optical fiber connection points, and when the optical fiber connection points are in a contamination condition, for example, optical signals are reflected back and forth between the optical fiber connection points, so as to generate interference. Referring to fig. 1b, in the prior art, the received optical power and the error rate of the system can be obtained, and the size of the MPI is determined according to the received optical power and the error rate, and if the size of the MPI exceeds the standard, an alarm is reported. However, the above method can only determine the size of the MPI, and cannot determine the position of the MPI in the optical fiber link.

When the MPI has an impact on the communication, the operator often uses the flow as in fig. 1c for operation and maintenance. When the optical power is normal but the ports are not up, the ports are frequently up-down, the ports have error code warning before correction or the ports have abnormal conditions of CRC growth, firstly judging whether the optical modules at the two ends are matched, and if the optical modules are not matched, replacing the matched optical modules. If the optical modules at the two ends are matched, judging whether the FEC configurations at the two ends are the same, and if the FEC configurations are different, modifying the FEC configurations until the FEC configurations are the same. If the FEC configurations at the two ends are the same, judging whether the near-end self-loop faults at the two ends are eliminated, and if not, determining that the software problem or the single board fault occurs. If the near-end self-loop faults at the two ends are eliminated, judging whether the far-end self-loop faults are eliminated, and if so, determining that the software problem or the single board fault occurs. If not, further determining whether the optical fiber is a double-fiber bidirectional optical module, if not, replacing the optical fiber with the double-fiber bidirectional optical module, judging whether the abnormal situation is eliminated, and if not, indicating that the optical fiber link quality is poor, and cleaning. If the two-fiber bidirectional optical module is adopted, judging whether the self-loop fault of the tail fiber is eliminated, if not, replacing the two-end optical modules, and if so, indicating that the quality of the optical fiber link is poor, and cleaning is required.

When it is determined that the MPI has occurred in the optical fiber link, the position of the MPI in the optical fiber link needs to be determined. Referring to fig. 1d, in the prior art, the optical modules at two ends are first pulled out and the optical fiber is pulled out, then an end surface instrument is used to check whether the receiving end surface of the optical module is polluted, and if so, a cleaning tool is used for cleaning. And then using an end face instrument to check the end face of the tail fiber, and cleaning the tail fiber by using a cleaning tool if the tail fiber is polluted. And finally, detecting optical path insertion loss and reflection segment by using OTDR, and finding out an optical fiber link point which leads to MPI. It is clear that the above process requires manual elimination, and the length of the optical fiber link is often several kilometers to several tens kilometers, which is laborious and laborious.

The embodiment of the application provides a method and related equipment for positioning MPI (multi-point interface), which are used for positioning the position where the MPI appears in an optical fiber link so as to carry out manual cleaning.

The application can be applied to a system architecture shown in fig. 2, wherein the system architecture comprises optical network equipment A, optical network equipment B and an optical fiber link for connecting the optical network equipment A and the optical network equipment B, the optical network equipment A is used as a transmitting end for transmitting signals to the optical network equipment B, and the optical fiber connection point in the optical fiber link is stained, so that MPI is generated. Referring to fig. 3, in a simple illustration, the optical network device a includes a signal generating module, a digital predistortion module (DIGITAL PRE distortion, DPD), a digital-to-analog conversion module (digital to analog converter, DAC) and TOAS, and the optical network device B includes a ROSA, an analog-to-digital conversion module (analog to digital converter, ADC), a phase interpolation module (phase interpolation, PI), a digital phase-locked loop module (DATA PHASE loop, DPLL), a clock feedforward equalizer (timeing recovery feedforward equalizer, trFFE), a clock phase discrimination module (time err detector, TED), an equalizer, a sequence decoding module and a micro control unit (micro controller unit, MCU).

The first optical network device in the present application may be an optical network device a, and the second optical network device may be an optical network device B.

Referring to fig. 4, the following describes the flow of the method for locating MPI in the present application:

401. The MCU acquires a first noise signal according to a signal output by the equalizer, the MCU and the equalizer are arranged on the first optical network equipment, an optical fiber link is arranged between the first optical network equipment and the second optical network equipment, and the equalizer is used for processing a signal sent by the second optical network equipment through the optical fiber link;

As shown in fig. 3, the optical network device a sends a signal to the optical network device B through the TOSA, the signal is sequentially processed by the teFEE module and the equalizer, and the MCU of the optical network device B acquires the signal a output from the equalizer, and starts the signal processing flow.

Referring to fig. 5, the following describes the signal processing flow:

As shown in fig. 5, the sler module in the MCU processes the signal a to obtain a decision signal, and then the MCU subtracts the decision signal from the signal a to obtain a first noise signal.

402. The MCU determines the sign of the jump window average value of the first noise signal;

If the MPI occurs in the optical fiber link, the phase of the main path signal and the phase of the reflected signal in the optical fiber link are both constructive and destructive, and referring to fig. 6a, the signal a generates jitter due to the influence of the MPI, wherein the jitter above the level line corresponds to the phase of the main path signal and the phase of the reflected signal being constructive, and the jitter below the level line corresponds to the phase of the main path signal and the phase of the reflected signal being destructive.

When the phases are mutually long, the first noise signal and the signal sent by the optical network equipment A are caused to be in positive correlation, when the phases are mutually eliminated, the first noise signal and the signal sent by the optical network equipment A are caused to be in negative correlation, and when the characteristics of positive correlation and negative correlation of the first noise signal exist at the same time, the correlation of the first noise signal and the signal sent by the optical network equipment A is destroyed. With continued reference to fig. 5, the mcu will average the first noise signal and take the sign of the average value of the first noise signal, taking the sequence of the first noise signal as [ 0.2, -0.1,0.1, -0.2,0.1,0.1,0.1, -0.1,0.2, -0.1 ] as an example, taking the length of the first noise signal as 5, and taking the sign of the average value of the first noise signal as (-0.2-0.1+0.1-0.2+0.1)/5= -0.3/5; the second window had a window jump average value of (0.1+0.1-0.1+0.2-0.1)/5=0.2/5, with a sign of +1. It can be seen that if the window average value of the window is positive, it indicates that the sequence in the window is positively correlated with the signal sent by the network device a, and if the window average value of the window is negative, it indicates that the sequence in the window is negatively correlated with the signal sent by the network device a.

403. The MCU multiplies the first noise signal with the sign to obtain a second noise signal;

Then, the MCU multiplies the sign of the obtained jump window average value by the first noise signal, and performs a DC Block module to perform a DC blocking process to obtain a second noise signal, namely, the sequence of the second noise signal is [ 0.2 x-1, -0.1 x-1, -0.2 x-1, 0.1 x1, -0.1 x1, 0.2 x1, -0.1 x1 ]. It can be seen that, through the above operation, the sequence in the window positively correlated with the signal sent by the network device a remains unchanged, and the sequence in the window negatively correlated with the signal sent by the network device a is multiplied by negative one, that is, the phase recovery corresponding to reversing the portion of jitter below the level line shown in fig. 6a, thereby becoming jitter above the level line, and further ensuring the correlation between the second noise signal and the signal sent by the optical network device a.

404. The MCU determines a reflection distance from the second noise signal, the reflection distance being used to indicate a distance between two fiber connection points in the fiber link that result in the MPI.

After obtaining the second noise signal, the MCU can determine a reflection distance from the second noise signal, where the reflection distance is a distance between two optical fiber connectors that result in MPI in an optical fiber link between the optical network device a and the optical network device B. The MCU can calculate the reflection distance according to the second noise signal by using different methods, and the following description will be made respectively:

mode one:

referring to fig. 6b, fig. 6b is a schematic diagram of a correlation peak, wherein the abscissa indicates the position of the correlation peak and the ordinate indicates the height of the correlation peak.

The MCU correlates the second noise signal with the target delay with the judgment signal, judges whether a correlation peak appears, and can further calculate the size and the reflection distance of the MPI if the correlation peak appears. Specifically, referring to fig. 7, the mcu determines the size of the MPI corresponding to the height of the correlation peak in fig. 7 as the size of the MPI in the optical fiber link, and the reflection distance satisfies the following equation (1):

reflection distance = target delay x speed of light (1)

Mode two:

The transmission period refers to simulating and testing a real data stream, typically using a pseudo-random binary sequence (PRBS) in a high-speed digital communication link. In the PRBS, binary numbers "0" and "1" are randomly present in one transmission period, the transmission period being related to the order of the PRBS, and the usual orders are 3, 7, 9, 11, 15, 20, and 23, and when the order is n, the corresponding transmission period is 2 minus 1 binary number to the power of n.

For example, in the foregoing process, the transmission period of the signal transmitted by the optical network device a is the transmission period a, the MCU correlates the second noise signal with the target signal, so as to obtain the height 1 of the correlation peak and the position 1 of the correlation peak, where the target signal may be a decision signal or may be an unprocessed signal sent by the optical network device a from the TOSA, and then the MCU saves the transmission period a, the height 1 of the correlation peak and the position 1 of the correlation peak. Then, referring to fig. 8, the mcu opens a backhaul channel, instructs the optical network device a to change the transmission period a to the transmission period B based on the backhaul channel, acquires the second noise signal and the target signal again, and correlates the second noise signal acquired this time with the target signal acquired this time, so as to obtain the height 2 of the correlation peak and the position 2 of the correlation peak corresponding to the transmission period B. The MCU can determine whether x, which represents the number of symbol symbols delayed between the second noise signal and the target signal, can be found from the chinese remainder theorem and the above data, and can be obtained, for example, by the following equation (2) and equation (3):

mod (x, transmit period a) =position 1 (2) of correlation peak

Mod (x, transmit period B) =position 2 (3) of correlation peak

The above equation (2) represents the position 1 where x is divided by the remainder of the transmission period a and the equation (3) represents the position 2 where x is divided by the remainder of the transmission period B and the correlation peak, and if the value of x can be obtained by combining the equation (2) and the equation (3), the reflection distance satisfies the following equation (4) while taking the signal transmitted by the optical network device a as an example of 28 Gbaud:

In addition, the MCU may also determine the height 1 of the correlation peak and the size of the MPI corresponding to the height 2 of the correlation peak in combination with the mapping relationship shown in fig. 7, and determine the obtained average value as the size of the MPI in the optical fiber link.

Of course, the above is only an example, if the above equation (2) and equation (3) cannot be solved, the MCU will continue to instruct the optical network device a to change the transmission period, and based on this, more equations similar to equation (2) and equation (3) are obtained, so as to implement the solution of x.

After determining the reflection distance, the MCU can determine two fiber connection points in the fiber link that result in the MPI according to the reflection distance and networking information of the fiber link. Referring to fig. 9, the networking information includes a distance between optical fiber connection points in the optical fiber link, and if the distance between two optical fiber connection points is equal to the reflection distance, it may be determined that the two optical fiber connection points cause the MPI. For example, if the reflection distance is 1.5 km, the distance between the optical fiber connection point a and the optical fiber connection point B is 0.3 km, the distance between the optical fiber connection point B and the optical fiber connection point C is 1.5 km, and the distance between the optical fiber connection point C and the optical fiber connection point D is 0.2 km, it can be determined that the optical fiber connection point B and the optical fiber connection point C cause the occurrence of MPI. Therefore, the optical network device B can send indication information and the size of the MPI to the network management system, the indication information indicates that the optical fiber connection point B and the optical fiber connection point C cause the occurrence of the MPI, or the optical network device B can also directly send the reflection distance and the size of the MPI to the network management system, and the network management device determines that the optical fiber connection point B and the optical fiber connection point C cause the occurrence of the MPI according to the reflection distance and the networking information of the optical fiber link, and the specific mode is similar to the foregoing, and is not repeated herein.

Referring to fig. 10, in a possible scenario, the network management system is capable of receiving reflection distances reported by a plurality of optical network devices 2 in communication with the optical network device 1, and the manner in which each of the optical network devices 2 determines the reflection distances is similar to that described above, which is not repeated herein. The network management system counts the reflection distances reported by the optical network devices 2, and if the reflection distances reported by the optical network devices are the same, the MPI is indicated to occur between the optical splitter and the optical network device 1.

In the application, the optical network equipment at the receiving end can carry out phase recovery on the noise signal, thereby accurately calculating the size of the MPI and the position where the MPI occurs based on the noise signal, and being convenient for maintenance personnel to maintain the optical fiber link.

The application also provides a method for determining the optical fiber link, which can be applied to the system architecture shown in fig. 11, wherein the system architecture comprises an OLT, an ODN and a plurality of ONUs, and the ONUs are connected to a network management system. The optical fiber jumping unit of the ODN comprises a plurality of optical fiber links, and the optical fiber jumping unit provides ports corresponding to the optical fiber links one by one to the outside so that the ONU can access the ODN. The reflecting points may be manufactured by manual abrasion in the optical splitter and each optical fiber link, so that the MPI may occur, wherein the reflecting point at the optical splitter is denoted as a reflecting point a, the reflecting point at the left side of the optical fiber link is denoted as a reflecting point B, and the reflecting point at the right side of the optical fiber link is denoted as a reflecting point C.

Referring to fig. 12, the following describes the flow of the method for determining an optical fiber link in the present application:

1201. the network management system receives a reflection distance from first optical network equipment, wherein the first optical network equipment is connected with a target optical fiber link of second optical network equipment, the reflection distance is determined by the first optical network equipment according to a signal transmitted from the target optical fiber link, and the reflection distance is used for indicating the distance between two optical fiber connection points which lead to MPI in the target optical fiber link;

in this embodiment, the network management system is a network management system in a system architecture as shown in fig. 11, the first network device is an ONU in the system architecture as shown in fig. 11, and the second network device is an ODN in the system architecture as shown in fig. 11.

Taking the optical fiber link 1 as an example, a signal from the OLT is transmitted to the optical fiber link 1 through the optical splitter, and is transmitted to the ONU1 sequentially through the reflection at the reflection point C and the reflection point B. The ONU1 can determine the reflection distance corresponding to the MPI in the optical fiber link 1, and report the reflection distance to the network management system, and the determination manner is similar to that described above, which is not repeated here. Therefore, the network management system can receive the reflection distance reported by each ONU in a similar manner.

1202. And the network management system determines the optical fiber link which is matched with the reflection distance between the two optical fiber connection points of the MPI and is caused to be the target optical fiber link in a plurality of optical fiber links in the second optical network equipment.

The network management system stores the distance between the reflection point B and the reflection point C in each optical fiber link in advance, and the distance between the reflection point B and the reflection point C in each optical fiber link is different, so when the ONU1 reports the reflection distance, the network management system can match the reflection distance with the distance between the reflection point B and the reflection point C in the optical fiber link 1, and determines that the ONU1 is accessed to the port 1, namely the optical fiber link 1 is accessed.

The method for determining the optical fiber link provided by the application can also be applied to a system architecture shown in fig. 13, wherein the system architecture comprises an OLT, an ODN and a plurality of ONUs, and the ONUs are connected to a network management system. The optical fiber jumping unit of the ODN comprises a plurality of optical fiber links, and the optical fiber jumping unit provides ports corresponding to the optical fiber links one by one to the outside so that the ONU can access the ODN. The reflection points may be manufactured by manual abrasion in the optical splitter and each optical fiber link, so that the MPI may occur, wherein the reflection point at the OND exit is denoted as reflection point a, and the reflection point at the ONU is denoted as reflection point B. Furthermore, the distance between the OLT and the reflection point a in each fiber link is the same.

Referring to steps a01 to a02, the following describes the flow of the method for determining an optical fiber link in the present application:

A01, the network management system receives a reflection distance from first optical network equipment, wherein the first optical network equipment is connected with a target optical fiber link of second optical network equipment, the reflection distance is determined by the first optical network equipment according to a signal transmitted from the target optical fiber link, and the reflection distance is used for indicating the distance between two optical fiber connection points which lead to MPI in the target optical fiber link;

Taking the optical fiber link 1 as an example, a signal from the OLT is transmitted to the optical fiber link 1 through the optical splitter, and is transmitted to the ONU1 sequentially through the reflection of the reflection point B and the reflection point a. The ONU1 can determine the reflection distance corresponding to the MPI in the optical fiber link 1, and report the reflection distance to the network management system, and the determination manner is similar to that described above, which is not repeated here. Therefore, the network management system can receive the reflection distance reported by each ONU in a similar manner.

A02, the network management system determines an optical fiber link which is matched with the reflection distance between two optical fiber connection points of the MPI and is caused to be a target optical fiber link in a plurality of optical fiber links in the second optical network equipment.

The network management system can obtain the distance between each ONU and the OLT through the OTDR, and can obtain the distance between the OLT and the reflection point a in each optical fiber link, so as to obtain the distance between the reflection point a and the reflection point B in each optical fiber link, that is, the distance between two optical fiber connection points that result in the MPI. Therefore, after the ONU1 reports the reflection distance, the network management system determines that the reflection distance matches the distance between the reflection point a and the reflection point B in the optical fiber link 1, so as to determine that the ONU1 accesses the port 1, that is, accesses the optical fiber link 1.

The present application also provides a method for determining an idle port, which can be applied to the system architecture shown in fig. 14, and the system architecture is similar to that shown in fig. 11, except that an idle port exists, for example, the idle port is port 1.

Referring to fig. 15, the following describes the flow of the method for determining the idle port in the present application:

1501. The network management system receives reflection distances from a plurality of first optical network devices, wherein the plurality of first optical network devices are respectively connected with different optical fiber links of the second optical network device, the reflection distances are determined by the first optical network devices according to signals transmitted from the optical fiber links, and the reflection distances are used for indicating the distances between two optical fiber connection points which lead to MPI in the optical fiber links;

As shown in fig. 14, since the ONU1 is not connected to the port 1, the port 1 becomes an idle port, and a signal sent by the OLT is reflected to the reflection point a after reaching the reflection point B in the optical fiber link 1 through the optical splitter, and is transmitted to the remaining optical fiber links again through the optical splitter. The reflection distances will be reported to the network management system by the rest ONUs except ONU1, and the method for determining the reflection distances is similar to that described in the foregoing embodiment, and will not be repeated here. Taking ONU2 as an example, ONU2 reports the reflection distance corresponding to the reflection point B and the reflection point a of the optical fiber link 1 in addition to the reflection distance corresponding to the reflection point B and the reflection point C in the optical fiber link 2. Similarly, the reflection distances reported by the ONU2 and the ONU3 include the reflection distance corresponding to the reflection point B and the reflection point a of the optical fiber link 1 in addition to the reflection distance corresponding to the optical fiber link to which the ONU2 and the ONU3 are connected.

1502. If the reflection distances of the plurality of first optical network devices all comprise the target distance, the network management system determines that the target optical fiber link of the second optical network device has an idle port, and the target distance is the distance between two optical fiber connection points, which lead to the MPI, in the target optical fiber link.

The network management system stores the distance between the reflection point B and the reflection point A in each optical fiber link in advance, and the distance between the reflection point B and the reflection point A in each optical fiber link is different, so that after the network management system determines that each ONU reports the reflection distance corresponding to the reflection point B and the reflection point A of the optical fiber link 1, the port 1 is determined to be an idle port.

The method of the present application is described above and the apparatus of the present application is described below:

referring to fig. 16, an MCU1600 of the present application includes an acquisition unit 1601, a processing unit 1602, and a transmitting unit 1603.

The acquiring unit 1601 is configured to acquire a first noise signal according to a signal output by the equalizer, where the MCU and the equalizer are disposed in a first optical network device, an optical fiber link is disposed between the first optical network device and a second optical network device, and the equalizer is configured to process a signal sent by the second optical network device through the optical fiber link.

A processing unit 1602 is configured to determine a sign of a window-jump average of the first noise signal. The processing unit is further configured to multiply the first noise signal with the sign to obtain a second noise signal.

The processing unit 1602 is further configured to determine a reflection distance from the second noise signal, the reflection distance being used to indicate a distance between two fiber connection points in the fiber link that result in the MPI.

In one possible implementation of the present invention,

The processing unit 1602 is further configured to determine two optical fiber connection points according to the reflection distance and networking information of the optical fiber link, where the networking information includes a distance between the optical fiber connection points in the optical fiber link.

In one possible implementation of the present invention,

And the sending unit 1603 is configured to send the reflection distance to the network management system, so that the network management system determines two optical fiber connection points according to the reflection distance and networking information of the optical fiber link, where the networking information includes a distance between the optical fiber connection points in the optical fiber link.

In one possible implementation of the present invention,

The processing unit 1602 is specifically configured to correlate the second noise signal with a target signal to obtain a first correlation peak position, where the target signal is a decision signal obtained according to a signal output by the equalizer, or a signal sent by the second optical network device to the first optical network device, and the second optical network device sends the signal based on the first sending period.

The processing unit 1602 is further configured to instruct, via the backhaul channel, the first optical network device to transmit a signal based on the second transmission period, so as to obtain a second correlation peak position corresponding to the second transmission period.

The processing unit 1602 is further configured to determine the reflection distance according to the first correlation peak position, the second correlation peak position, the first transmission period, the second transmission period, and the chinese remainder theorem.

In one possible implementation of the present invention,

The processing unit 1602 is specifically configured to correlate the second noise signal with the target delay with the target signal, multiply the target delay with the speed of light if a correlation peak occurs, so as to determine the reflection distance, where the target signal is a decision signal obtained according to the signal output by the equalizer.

In one possible implementation of the present invention,

The processing unit 1602 correlates the second noise signal with the target signal and also obtains a first correlation peak height.

The processing unit 1602 is further configured to obtain a first magnitude value of the MPI according to the first correlation peak height.

The processing unit 1602 instructs the first optical network device to transmit signals based on the second transmission period and also obtains a second correlation peak height corresponding to the second transmission period.

The processing unit 1602 is further configured to obtain a second magnitude value of MPI according to the second correlation peak height.

In one possible implementation of the present invention,

The acquiring unit 1601 is specifically configured to acquire a decision signal according to a signal output by the equalizer.

The acquiring unit 1601 is further configured to subtract the decision signal from the equalizer output signal to acquire a first noise signal.

In one possible implementation of the present invention,

The processing unit 1602 is specifically configured to multiply the first noise signal with the sign, and perform a blocking process to obtain a second noise signal.

Referring to fig. 17, the network management system 1700 in the present application includes a receiving unit 1701 and a determining unit 1702.

And a receiving unit 1701, configured to receive a reflection distance from the first optical network device, where the first optical network device is connected to the target optical fiber link of the second optical network device, and the reflection distance is determined by the first optical network device according to a signal transmitted from the target optical fiber link, where the reflection distance is used to indicate a distance between two optical fiber connection points in the target optical fiber link that result in the MPI.

A determining unit 1702, configured to determine, as a target optical fiber link, an optical fiber link that is among a plurality of optical fiber links in the second optical network device and that causes a distance between two optical fiber connection points of the MPI to match a reflection distance.

Referring to fig. 18, the network management system 1800 of the present application includes a receiving unit 1801 and a determining unit 1802.

The receiving unit 1801 is configured to receive reflection distances from a plurality of first optical network devices, where the plurality of first optical network devices are respectively connected to different optical fiber links of the second optical network device, the reflection distances are determined by the first optical network device according to signals transmitted from the optical fiber links, and the reflection distances are used to indicate distances between two optical fiber connection points that result in MPI in the optical fiber links.

And the determining unit 1802 is configured to determine, by using the network management system, that the target optical fiber link of the second optical network device has an idle port if the reflection distances of the plurality of first optical network devices all include the target distance, where the target distance is a distance between two optical fiber connection points in the target optical fiber link that result in the MPI.

Fig. 19 is a schematic structural diagram of an apparatus provided in an embodiment of the present application, where the apparatus 1900 may be an MCU or a network management system in the foregoing embodiment, and includes one or more central processing units (central processing units, CPU) 1901 and a memory 1905, where one or more application programs or data are stored in the memory 1905.

Wherein the memory 1905 may be volatile storage or persistent storage. The program stored in the memory 1905 may include one or more modules, each of which may include a series of instruction operations in the server. Further, central processor 1901 may be configured to communicate with memory 1905 and execute a series of instruction operations in memory 1905 on central processor 1900.

The device 1900 may also include one or more power central processors 1902, one or more wired or wireless network interfaces 1903, one or more input/output interfaces 1904, and/or one or more operating systems. The cpu 1901 may perform the operations of the MCU or the network management device in the foregoing embodiments, which will not be described herein.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random-access memory (RAM, random access memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Claims

1. A method of locating multipath interference, MPI, comprising:

the micro processing unit MCU acquires a first noise signal according to a signal output by the equalizer, the MCU and the equalizer are arranged on first optical network equipment, an optical fiber link is arranged between the first optical network equipment and second optical network equipment, and the equalizer is used for processing a signal sent by the second optical network equipment through the optical fiber link;

the MCU determines the sign of the jump window average value of the first noise signal;

The MCU multiplies the first noise signal by the sign to obtain a second noise signal;

the MCU determines a reflection distance according to the second noise signal, wherein the reflection distance is used for indicating the distance between two optical fiber connection points which lead to MPI in the optical fiber link.

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

And the MCU determines the two optical fiber connection points according to the reflection distance and networking information of the optical fiber link, wherein the networking information comprises the distance between the optical fiber connection points in the optical fiber link.

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

The MCU sends the reflection distance to a network management system, so that the network management system determines the two optical fiber connection points according to the reflection distance and networking information of the optical fiber link, wherein the networking information comprises the distance between the optical fiber connection points in the optical fiber link.

4. A method according to any one of claims 1 to 3, wherein the MCU determining a reflection distance from the second noise signal comprises:

The MCU correlates the second noise signal and a target signal to obtain a first correlation peak position, wherein the target signal is a decision signal obtained according to a signal output by the equalizer or a signal sent by the second optical network device to the first optical network device, and the second optical network device sends a signal based on a first sending period;

The MCU indicates the first optical network equipment to send signals based on a second sending period through a return channel so as to acquire a second relative peak position corresponding to the second sending period;

And the MCU determines the reflection distance according to the first correlation peak position, the second correlation peak position, the first transmission period, the second transmission period and the Chinese remainder theorem.

5. A method according to any one of claims 1 to 3, wherein the MCU determining a reflection distance from the second noise signal comprises:

and the MCU correlates the second noise signal with the target delay with the target signal, if a correlation peak appears, multiplying the target delay with the speed of light to determine the reflection distance, wherein the target signal is a decision signal obtained according to the signal output by the equalizer.

6. The method of claim 4, wherein the MCU correlates the second noise signal and the target signal and also obtains a first correlation peak height;

The method further comprises the steps of:

the MCU acquires a first magnitude value of the MPI according to the first correlation peak height;

The MCU indicates the first optical network device to send signals based on the second sending period, and also obtains a second correlation peak height corresponding to the second sending period;

The method further comprises the steps of:

And the MCU acquires a second magnitude value of the MPI according to the second correlation peak height.

7. The method of any one of claims 1 to 6, wherein the MCU obtaining a first noise signal from the equalizer output signal comprises:

the MCU acquires a decision signal according to the signal output by the equalizer;

The MCU subtracts the decision signal from the equalizer output signal to obtain the first noise signal.

8. The method of claim 7, wherein the MCU multiplying the first noise signal with the sign to obtain a second noise signal comprises:

the MCU multiplies the first noise signal by the sign and performs a blocking process to obtain the second noise signal.

9. A method of determining a fiber optic link, comprising:

The network management system receives a reflection distance from first optical network equipment, wherein the first optical network equipment is connected with a target optical fiber link of second optical network equipment, the reflection distance is determined by the first optical network equipment according to a signal transmitted from the target optical fiber link, and the reflection distance is used for indicating the distance between two optical fiber connection points which lead to MPI in the target optical fiber link;

and the network management system determines an optical fiber link which is matched with the reflection distance in the distance between two optical fiber connection points of the MPI and is caused to be the target optical fiber link in a plurality of optical fiber links in the second optical network equipment.

10. A method of determining an idle port, comprising:

the network management system receives reflection distances from a plurality of first optical network devices, wherein the plurality of first optical network devices are respectively connected with different optical fiber links of second optical network devices, the reflection distances are determined by the first optical network devices according to signals transmitted from the optical fiber links, and the reflection distances are used for indicating the distances between two optical fiber connection points which lead to MPI in the optical fiber links;

if the reflection distances of the plurality of first optical network devices all include a target distance, the network management system determines that a target optical fiber link of the second optical network device has an idle port, where the target distance is a distance between two optical fiber connection points in the target optical fiber link, where the two optical fiber connection points lead to the MPI.

11. A micro-processing unit MCU, comprising:

The acquisition unit is used for acquiring a first noise signal according to a signal output by the equalizer, the MCU and the equalizer are arranged in first optical network equipment, an optical fiber link is arranged between the first optical network equipment and second optical network equipment, and the equalizer is used for processing a signal sent by the second optical network equipment through the optical fiber link;

A processing unit for determining a sign of a jump window average of the first noise signal;

the processing unit is further configured to multiply the first noise signal with the sign to obtain a second noise signal;

the processing unit is further configured to determine a reflection distance according to the second noise signal, where the reflection distance is used to indicate a distance between two optical fiber connection points in the optical fiber link that result in the MPI.

12. A network management system, comprising:

A receiving unit, configured to receive a reflection distance from a first optical network device, where the first optical network device is connected to a target optical fiber link of a second optical network device, where the reflection distance is determined by the first optical network device according to a signal transmitted from the target optical fiber link, and the reflection distance is used to indicate a distance between two optical fiber connection points that result in MPI in the target optical fiber link;

And the determining unit is used for determining an optical fiber link which is matched with the reflection distance in the distance between two optical fiber connection points of the MPI and is caused to be the target optical fiber link in a plurality of optical fiber links in the second optical network equipment.

13. A network management system, comprising:

A receiving unit, configured to receive reflection distances from a plurality of first optical network devices, where the plurality of first optical network devices are respectively connected with different optical fiber links of a second optical network device, where the reflection distances are determined by the first optical network device according to signals transmitted from the optical fiber links, and the reflection distances are used to indicate a distance between two optical fiber connection points that result in MPI in the optical fiber links;

and the determining unit is used for determining that an idle port exists in a target optical fiber link of the second optical network device if the reflection distances of the plurality of first optical network devices all comprise target distances, wherein the target distances are distances between two optical fiber connection points which lead to MPI in the target optical fiber link.

14. An optical network device comprising a micro-processing unit MCU according to claim 11.

15. A micro-processing unit MCU, characterized by comprising a processor and a memory, the processor being coupled to the memory, which when executing a program in the memory, causes the MCU to perform the method according to any of the preceding claims 1-8.

16. A network management system comprising a processor and a memory, the processor being coupled to the memory, which when executed by the processor causes the network management system to perform the method of any of the preceding claims 9 or 10.

17. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program which, when executed by the computer, performs the method of any one of claims 1 to 10.

18. A computer program product, characterized in that the computer performs the method according to any of claims 1 to 10 when the computer program product is executed on a computer.