An online link state monitoring and optical fiber fault locating method based on service data

Abstract

The application discloses an online link state monitoring and optical fiber fault positioning method based on service data and belongs to the field of optical fiber communication. The method judges whether an optical fiber fault event occurs by judging Stokes parameters fed back by receivers of first and second transceiver ends of a coherent light uplink and downlink transmission system, and when the optical fiber fault event occurs, the relevant operation of the Stokes parameters is performed, and the optical fiber fault positioning can be realized by an index value corresponding to a correlation peak. The method has low calculation complexity, does not need to change the original system architecture of the coherent light uplink and downlink transmission system, guarantees network flexibility, does not need to increase additional detection devices, can reduce equipment cost and operation and maintenance cost, does not need additional modulation signals, only needs to use service data in a transmission process, does not need additional channels, saves spectrum resources, thereby reduces link monitoring cost and operation complexity, improves system flexibility and reliability, and makes the operation and maintenance of the optical network more intelligent.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical fiber communication, and more particularly relates to an online link state monitoring and optical fiber fault positioning method based on service data. BACKGROUND

[0002] Implementing online optical monitoring and analysis (OMA) in a pass-through optical transmission link is crucial to reducing the operation cost (OPEX) of future optical network infrastructure. In order to realize the sensing function of the optical network, network automation operations are performed according to the information provided by the sensor, the optical behavior in the network is estimated and the current state is adjusted. Several technologies have been developed and studied to achieve this. One of the biggest problems in these technologies is how to monitor the state of numerous nodes and links in a large-scale optical network in a cost-effective and easy-to-deploy manner. Any method that directly implements a large number of various monitors at different locations will face huge deployment and operation costs.

[0003] Among existing detection technologies, the reflection-based detection scheme, such as optical time domain reflectometer (OTDR), has excellent sensitivity and breakpoint monitoring capability, but cannot achieve uninterrupted online monitoring, and requires additional equipment and personnel training, which greatly increases the system cost and prolongs the maintenance time; the dispersion-reconstruction-link-based scheme, such as longitudinal power monitoring (LPM) of optical fiber, does not require additional detection equipment, but cannot monitor optical fiber breakpoints, and has insufficient monitoring accuracy and high computational complexity, which is not conducive to online implementation.

[0004] In summary, the existing link detection technologies have the problems of high cost and complex use of devices, and the existing online monitoring schemes have high implementation complexity and insufficient monitoring accuracy. Therefore, how to implement online link detection in a pass-through link at a low cost is a problem that needs to be solved at present. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides an online link state monitoring and optical fiber fault positioning method based on service data, thereby solving the problem that the existing monitoring technology cannot simultaneously achieve online monitoring of optical fiber faults and low-cost and low-complexity implementation.

[0006] To achieve the above-mentioned purpose, according to a first aspect of the present application, an online link state monitoring and optical fiber fault positioning method based on service data is provided, comprising:

[0007] S1, synchronously acquiring in real time Stokes parameters S L (t) and S R (t) of the first and second optical signals respectively received by the first and second transceivers in the coherent optical uplink and downlink transmission system one by one respectively.

[0008] The first and second optical signals are respectively uplink and downlink signals of the coherent light.

[0009] S2, according to S L (t), S R (t) judges that the first and second optical signals are both changed in polarization state, identifies the optical fiber fault event corresponding to the change in polarization state, and calculates S L (t), S R (t) between the correlation results According to the symbol index value corresponding to the correlation peak in R(τ), the optical fiber fault position is calculated.

[0010] The optical fiber fault event includes an optical fiber breakpoint event, a bending event, and a twisting event; Z=L-c·Δt / n, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, f s is the symbol rate, * is the conjugate operator; when the first transceiver is taken as a reference, lag is the index value corresponding to the correlation peak in S L (t), the optical fiber fault position is Z away from the first transceiver; when the second transceiver is taken as a reference, lag is the index value corresponding to the correlation peak in S R (t), the optical fiber fault position is Z away from the second transceiver.

[0011] According to a second aspect of the present application, an online link state monitoring and optical fiber fault positioning device based on service data is provided, comprising:

[0012] The acquisition module is configured to synchronously acquire, in real time, the Stokes parameters S L (t), S R (t) of the first and second optical signals respectively received by the first and second transceivers one by one in the coherent light uplink and downlink transmission system.

[0013] The first and second optical signals are respectively uplink and downlink signals of the coherent light.

[0014] The link fault detection and positioning module is configured to, according to S L (t), S R (t) judges that the first and second optical signals are both changed in polarization state, identifies the optical fiber fault event corresponding to the change in polarization state, and calculates S L (t), S R (t) between the correlation results According to the symbol index value corresponding to the correlation peak in R(τ), the optical fiber fault position is calculated.

[0015] Wherein, Z=L-c·Δt / n, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, f s is the symbol rate; when the first transceiver is taken as a reference, lag is S L (t) corresponds to the index value, the optical fiber fault position is Z away from the first transceiver; when the second transceiver is taken as a reference, lag is S R (t) corresponds to the index value, the optical fiber fault position is Z away from the second transceiver.

[0016] According to a third aspect of the present application, a coherent optical upstream and downstream transmission system is provided, comprising a first transceiver and a second transceiver, and further comprising the online link state monitoring and optical fiber fault positioning device based on service data according to the second aspect.

[0017] According to a fourth aspect of the present application, an electronic device is provided, comprising a computer readable storage medium and a processor.

[0018] The computer readable storage medium is configured to store executable instructions.

[0019] The processor is configured to read the executable instructions stored in the computer readable storage medium and execute the method according to the first aspect.

[0020] According to a fifth aspect of the present application, a computer readable storage medium is provided, which stores computer instructions for causing a processor to execute the method according to the first aspect.

[0021] According to a sixth aspect of the present application, an online link state monitoring and optical fiber fault positioning method based on service data is provided, which is applied to a first transceiver in a coherent optical upstream and downstream transmission system, and comprises the following steps:

[0022] S1, calculating the Stokes parameter S L (t) of the received first optical signal; R (t) of the second optical signal received by the second transceiver;

[0023] Wherein, the first and second optical signals are coherent optical upstream and downstream signals respectively;

[0024] S2, judging the optical fiber fault event corresponding to the polarization state change according to S L (t) and S R (t), and calculating the correlation result between S L (t) and S R (t) and the fiber fault position is calculated according to the index value corresponding to the correlation peak in R(τ);

[0025] Wherein, the fiber fault event includes fiber breaking event, bending event and twisting event; Z=L-c·Δt / n, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, f s is the symbol rate; when the first transceiver is taken as a reference, lag is S L (t), the fiber fault position is away from the first transceiver by Z; when the second transceiver is taken as a reference, lag is S R (t), the fiber fault position is away from the second transceiver by Z.

[0026] According to a seventh aspect of the present application, a first transceiver in a coherent optical upstream and downstream transmission system is provided, comprising:

[0027] A calculation and acquisition module is configured to calculate the Stokes parameter S L (t) of the received first optical signal and acquire the Stokes parameter S R (t) of the second optical signal received by the second transceiver.

[0028] Wherein, the first and second optical signals are coherent optical upstream and downstream signals respectively;

[0029] A link fault detection and positioning module is configured to judge the fiber fault event corresponding to the polarization state change when the polarization state of the first and second optical signals is changed according to S L (t) and S R (t), calculate the correlation result between S L (t) and S R (t) at the time point corresponding to the fiber fault event. and the fiber fault position is calculated according to the index value corresponding to the correlation peak in R(τ);

[0030] Wherein, the fiber fault event includes fiber breaking event, bending event and twisting event; Z=L-c·Δt / n, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, f s is the symbol rate; when the first transceiver is taken as a reference, lag is S L (t), the fiber fault position is away from the first transceiver by Z; when the second transceiver is taken as a reference, lag is S R (t), the fiber fault position is away from the second transceiver by Z.

[0031] Compared with the prior art, the above technical scheme conceived by the present application can achieve the following beneficial effects:

[0032] The method provided by the present application can realize fiber fault positioning through correlation operation of Stokes parameters fed back by receivers at two ends (i.e. first and second transceiver ends) of the coherent optical uplink and downlink transmission system, and through index values corresponding to correlation peaks. The method only needs to use tap coefficients output by equalizers to calculate corresponding Stokes parameters, and perform correlation operation on corresponding Stokes parameters of two receivers, so as to realize fiber fault positioning, which can greatly reduce the pressure of two-end DSP. Moreover, the method does not need to change the original system architecture of the coherent optical uplink and downlink transmission system, greatly ensuring network flexibility. In addition, the present application does not need additional modulation signals, but only uses service data in the transmission process, without additional channels, thereby saving spectrum resources. The present application can realize the difficult problems of link monitoring and fiber breakpoint positioning in the original system only by using service data, and can simultaneously realize positioning of fiber bending events and twisting events, and is suitable for various transmission application scenarios such as PON, data center and backbone network. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A flowchart of the online link state monitoring and fiber fault positioning method based on service data provided by the embodiment of the present application is shown in the figure.

[0034] Figure 2 A schematic diagram of simulating fiber fracture behavior and performing online link detection and fiber fault positioning using an electrically controlled VOA in the coherent optical uplink and downlink transmission system provided by the embodiment of the present application is shown in the figure.

[0035] Figure 3 A schematic diagram of changes in Stokes parameters received by two ends of the link after a change in the link state provided by the embodiment of the present application is shown in the figure.

[0036] Figure 4 A schematic diagram of correlation operation results of Stokes signals received by two ends of the link provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] The embodiment of the present application provides a service data-based online link state monitoring and optical fiber fault positioning method, comprising:

[0039] S1, synchronously acquiring, in real time, Stokes parameters S L (t) of first and second optical signals respectively received by the first and second transceivers in the coherent optical upstream and downstream transmission system R (t).

[0040] The first and second optical signals are respectively coherent optical upstream and downstream signals.

[0041] S2, judging, according to S L (t) and S R (t), whether a polarization state change occurs in the first and second optical signals, and identifying an optical fiber fault event corresponding to the polarization state change, calculating a correlation result R(τ) between S L (t) and S R (t) at a time point corresponding to the optical fiber fault event and calculating an optical fiber fault position according to a symbol index value corresponding to a correlation peak in R(τ);

[0042] The optical fiber fault event includes an optical fiber breaking event, a bending event and a twisting event; Z=L-c·Δt / n, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, f s is the symbol rate, and * is a conjugate operator; when the first transceiver is taken as a reference, lag is an index value corresponding to a correlation peak in S L (t), and the optical fiber fault position is Z away from the first transceiver; when the second transceiver is taken as a reference, lag is an index value corresponding to a correlation peak in S R (t), and the optical fiber fault position is Z away from the second transceiver.

[0043] To improve the calculation accuracy, preferably, before the equalization processing on the any optical signal, the method further comprises:

[0044] Residual dispersion compensation and frame synchronization processing are performed on the any optical signal.

[0045] As known by those skilled in the art, the coherent optical upstream and downstream transmission system is used to realize long-distance and high-rate optical signal transmission, and combines the coherent detection technology and the upstream and downstream signal transmission mechanism to improve the performance and efficiency of the communication system; the upstream and downstream signals are transmitted at different wavelengths to avoid interference. For example, the PON network and the single-fiber bidirectional transmission system are all coherent optical upstream and downstream transmission systems.

[0046] The coherent optical upstream and downstream transmission system comprises a first transceiver, a second transceiver and a transmission link between the first and second transceivers.

[0047] The first transceiver and the second transceiver each comprise a transmitting end and a receiving end; taking a signal link transmitted from the first transceiver to the second transceiver as an example, the transmitting end of the first transceiver maps original data to generate X and Y polarization data, inserts a training sequence and a synchronization header at the front end of a data sequence, forms a sending signal data frame, and modulates the sending signal data frame to an optical carrier to generate an optical signal, which is transmitted to the receiving end of the second transceiver through an optical fiber link, and the signal is gain-amplified by a link EDFA during long-distance transmission; the receiving end of the second transceiver performs residual dispersion compensation and frame synchronization processing on the received optical signal to obtain a required signal data frame, processes the data using an equalization algorithm, obtains a transmission channel matrix H according to the equalization algorithm used, and performs equalization processing on the X and Y polarization mixed data sequence using the transmission channel matrix H to obtain a double-polarization signal in which the mixing is eliminated; the link from the second transceiver to the first transceiver is the same.

[0048] The method provided by the application, the receiving end of the first transceiver performs equalization processing on the received optical signal (i.e., the first optical signal), and obtains a transmission channel matrix H L The Stokes parameter S L (t) of the first optical signal, and the receiving end of the second transceiver performs equalization processing on the received optical signal (i.e., the second optical signal), and obtains a transmission channel matrix H R The Stokes parameter S R (t) of the second optical signal; S L (t) and S R (t) are respectively used to represent the polarization state changes of the first and second optical signals transmitted in the coherent optical uplink and downlink. Based on the principle that the same event has the same influence on the polarization states of different wavelength signals in bidirectional transmission, and the polarization state changes caused by different events have different characteristics, fiber fault positioning can be realized by correlating the Stokes parameters fed back by the receivers at both ends (i.e., the first and second transceivers); specifically, the event classification algorithm is used to judge and identify the types of fiber fault events corresponding to different polarization state changes, the types of fiber fault events include an optical fiber breakpoint event, an optical fiber bending event, and an optical fiber twisting event, the Stokes parameters S L (t) and S R (t) of both ends (i.e., the first and second transceivers) at the time point corresponding to the fiber fault event are correlated, the signal transmission distance is converted according to the peak point index value, and fiber fault positioning is realized; wherein, the time synchronization mechanism is used to ensure that the data collected by both ends at the same time have time correlation.

[0049] It can be understood that when the fiber failure event does not occur, the Stokes parameter is in a steady state, when the fiber failure event occurs, the polarization state of the optical signal changes, and accordingly, the Stokes parameter will change abruptly, and according to the degree of change, the event classification algorithm can be used to judge and identify the type of fiber failure event corresponding to different polarization state changes.

[0050] For any optical signal, its Stokes parameter S(t) = {S0, S1, S2, S3}, H is a channel transmission matrix obtained by equalizing the any optical signal, and h xx , h xy , h yx , h yy are tap coefficients of four filters used for equalization.

[0051] That is, for any optical signal, its Stokes parameter S(t) = {S0, S1, S2, S3} is calculated according to the tap coefficients of the equalizer during equalization, and is used to represent the polarization state change of the optical signal in link transmission.

[0052] The above equalization uses the existing CMA equalization algorithm, and the transmission channel matrix H is calculated to equalize the optical signal.

[0053] Taking a constant modulus signal as an example, the CMA algorithm is used to depolarize, and the iterative update of the H matrix element can be expressed as:

[0054] h xx (n+1) = h xx (n) + μ(1-|E X1 (n)| 2 )E X1 (n)E x1 (n) *

[0055] h xy (n+1) = h xy (n) + μ(1-|E X1 (n)| 2 )E X1 (n)E y1 (n) *

[0056] h yx (n+1) = h yx (n) + μ(1-|E Y1 (n)| 2 )E Y1 (n)E x1 (n) *

[0057] hyy (n+1) = h yy (n) + μ(1 - |E Y1 (n)| 2 )E Y1 (n)E y1 (n) *

[0058] Wherein, n represents the nth symbol, and μ is an algorithm step length. The channel correlation matrix H can be calculated according to the training sequence data and the above formula.

[0059] Taking the optical fiber fault event as an example, the calculation process of the optical fiber breakpoint positioning is as follows:

[0060] First, the correlation result R(τ) of S L (t) and S r (t) is calculated:

[0061]

[0062] Wherein, S L (t) and S R (t) represent the Stokes parameter values of the first and second optical signals respectively;

[0063] Then, the symbol index value corresponding to the correlation peak in R(v) is searched to calculate the position of the breakpoint:

[0064]

[0065] L-Z = c·Δt / n

[0066] Wherein, lag is the index value corresponding to the correlation peak, f s is the symbol rate, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, and Z is the breakpoint distance to be calculated. When the first transceiver end is taken as the reference, lag is the index value corresponding to the correlation peak in S L (t), and the optical fiber breakpoint position is Z away from the first transceiver end. When the second transceiver end is taken as the reference, lag is the index value corresponding to the correlation peak in S R (t), and the optical fiber breakpoint position is Z away from the second transceiver end.

[0067] It can be understood that when the optical fiber bending event or the optical fiber twisting event occurs, the positioning calculation process of the optical fiber bending point or the optical fiber twisting point is the same as above.

[0068] The online link state monitoring and optical fiber fault positioning device based on service data provided by the embodiment of the application is described below. The online link state monitoring and optical fiber fault positioning device based on service data described below can be correspondingly referred to the online link state monitoring and optical fiber fault positioning method based on service data described above.

[0069] The embodiment of the present application provides a device for online link state monitoring and fiber fault positioning based on service data, comprising:

[0070] The acquisition module is used for synchronously acquiring Stokes parameters S L (t) and S R (t) of the first and second optical signals respectively received by the first and second transceivers in the coherent optical uplink and downlink transmission system in real time.

[0071] The first and second optical signals are respectively coherent optical uplink and downlink signals.

[0072] The link fault detection and positioning module is used for judging the polarization state change corresponding to the fiber fault event when the polarization state of the first and second optical signals is changed, calculating the correlation result between S L (t) and S R (t) at the time point corresponding to the fiber fault event, and calculating the fiber fault position according to the symbol index value corresponding to the correlation peak in R(τ). L R The link fault detection and positioning module is used for judging the polarization state change corresponding to the fiber fault event when the polarization state of the first and second optical signals is changed, calculating the correlation result between S L (t) and S R (t) at the time point corresponding to the fiber fault event, and calculating the fiber fault position according to the symbol index value corresponding to the correlation peak in R(τ). L R

[0073] Wherein, Z=L-c·Δt / n, c is the speed of light, n is the refractive index of light, L is the total length of the optical fiber, f s is the symbol rate; when the first transceiver is taken as a reference, lag is the index value corresponding to the correlation peak in S L (t), the fiber fault position is Z away from the first transceiver; when the second transceiver is taken as a reference, lag is the index value corresponding to the correlation peak in S R (t), the fiber fault position is Z away from the second transceiver.

[0074] The embodiment of the present application provides a coherent optical uplink and downlink transmission system, comprising a first transceiver and a second transceiver, and the system further comprises the device for online link state monitoring and fiber fault positioning based on service data as described in the above embodiment.

[0075] The skilled in the art knows that in the coherent optical uplink and downlink transmission system, the transmitting end of each transceiver includes a signal modulation module for modulating an electrical signal onto an optical carrier to generate an optical signal, and transmitting the optical signal through a relay-free optical communication system to the receiving end. The receiving end of each transceiver includes a compensation and synchronization module and a channel equalization module. The compensation and synchronization module is used for residual dispersion compensation and frame synchronization processing on the received optical signal to obtain the required signal data frame. The channel equalization module is used for depolarization and compensation of signal transmission damage on the received data sequence to obtain a transmission channel matrix H, and equalization processing on the data sequence of X and Y polarization intermixing using the transmission channel matrix H to obtain a double polarization signal eliminating intermixing.

[0076] In addition, each transceiver includes:

[0077] a transmitting laser for providing an optical carrier for the coherent transmitter;

[0078] a coherent transmitter composed of a DAC, four EA amplifications and a double bias IQ modulator, for coherently modulating an electrical signal to be sent onto the optical carrier emitted by the transmitting laser to form an output optical signal;

[0079] a receiving laser for providing a local oscillator light for the coherent receiver;

[0080] a coherent receiver for receiving the filtered optical signal, coherently combining the filtered optical signal with the local receiving laser, and then processing through a receiving end signal processing unit.

[0081] Taking the signal link transmitted from the first transceiver to the second transceiver as an example, the transmission link is composed of the transmitting end EDFA of the first transceiver, the receiving end EDFA of the second transceiver and an optical fiber. An electrical signal to be sent is modulated onto an optical carrier by a coherent transmitter to generate an optical signal, which is transmitted through an optical fiber and then received by a coherent receiver. The above transmission process is simultaneously completed at both ends of the optical fiber, realizing real-time uplink and downlink transmission in a single fiber.

[0082] In addition to the first and second transceivers, the coherent optical uplink and downlink transmission system provided by the present application further includes an online link state monitoring and optical fiber fault positioning device based on service data as described in the above embodiments. The device includes an acquisition module and a link fault detection and positioning module. The acquisition module is used for acquiring S L (t), S R (t), and the link fault detection and positioning module is used for detecting and positioning the link fault according to S L (t), S R(t) Realize link fault detection and positioning: realize transmission link state tracking by converting tap coefficients of equalizer output into Stokes parameters, identify fiber fault event type corresponding to different polarization state change by using event classification algorithm, locate fiber fault point by doing correlation operation on Stokes parameters received at both ends of link.

[0083] Take the main body of the coherent optical upstream and downstream transmission system as an example, which includes a SSMF fiber and FPGA transceivers at both ends; in this example, a VOA is used to simulate the behavior of fiber break, the loss of the VOA rises to 40 dB in ms time under voltage drive; in this example, a radio frequency source is used to generate two pulse signals, the period of the pulse signals is 1 kHz, and the duty cycles are 2% and 50% respectively, among which the 2% duty cycle signal is given to the two receivers as the trigger signal source to realize the synchronization of data acquisition, and the 50% duty cycle signal is given to the VOA to control the rapid increase of the loss of the VOA to 40 dB to simulate the effect of the instantaneous rise of the loss of the fiber at the moment of the fiber break, as shown in Figure 2 The 2% duty cycle pulse signal is slightly faster than the 50% duty cycle pulse signal to ensure that the receiver can collect the signal generated by the fiber break event; in this example, the input fiber optical power of the optical signal is -2 dBm; in this example, the preset fiber transmission distance is 2 km and 3 km respectively; the fiber transmission passes through the electrically controlled VOA, and finally is received by the coherent receiver and processed, wherein the line width of the local oscillator laser injected into the coherent receiver is 10 kHz.

[0084] Take the fiber fault event as the fiber break point event as an example, in order to realize real-time online link monitoring and break point positioning of the dual polarization QPSK modulation format, the transmission medium is a single mode fiber with an attenuation coefficient of 0.17 dB / km, and the link architecture is composed of a 2 km fiber transmission link and an electrically controlled VOA. The receiving end receives data through a coherent receiver, and uses the online link monitoring and fiber fault positioning method provided by the application, the monitoring effect of the Stokes parameters is as shown in Figure 3 When the link is running smoothly, the Stokes parameters detected by the receiving end are also very stable and in a straight line state; when the link state changes, the Stokes parameters change sharply, and the Stokes parameters received at both ends of the link change consistently; different events cause different characteristics of the Stokes parameters obtained by the receiving end, which can be used for event classification and discrimination. The positioning effect using the Stokes parameters is as shown in Figure 4 The correlation operation is performed on the Stokes parameters received at both ends of the link, and the break point distance is calculated according to the index value corresponding to the correlation peak and the transmission rate of the signal in the fiber.

[0085] The method provided by the application is based on the characteristic that the Stokes vector change characteristics caused by the same event on the signal light have high correlation, simultaneous uplink and downlink transmission is carried out in the same optical fiber by using different wavelengths, simultaneous collection of the signal is completed at the receiving end by using a time synchronization mechanism, the corresponding Stokes vector is calculated by using the channel transmission matrix obtained by the equalization algorithm, and the link state monitoring is completed. This method does not change the original system architecture, greatly guarantees the network flexibility; does not increase additional detection devices, greatly reduces the equipment cost and operation and maintenance cost; does not need additional modulation signals, only needs the service data in the transmission process, does not need additional channels, saves spectrum resources; only needs to use the equalizer tap coefficient to calculate the Stokes parameter, the data is collected and calculated synchronously at the receiving end on both sides, and the positioning of the fiber fault point is realized through correlation operation. The increased DSP resource consumption is small, the used method is flexible and efficient, the link state monitoring and the fiber fault point positioning can be accurately and efficiently realized without increasing additional equipment and using complex DSP, the problem that the link monitoring and the fiber fault point positioning are realized only by using the service data in the original system is solved, and the method is suitable for various transmission application scenarios such as PON, data center and backbone network.

[0086] An electronic device is provided in an embodiment of the application, and the electronic device includes a computer readable storage medium and a processor.

[0087] The computer readable storage medium is configured to store executable instructions.

[0088] The processor is configured to read the executable instructions stored in the computer readable storage medium and execute the method according to any one of the preceding embodiments.

[0089] A computer readable storage medium is provided in an embodiment of the application, and the computer readable storage medium stores computer instructions configured to cause a processor to execute the method according to any one of the preceding embodiments.

[0090] The above-mentioned "according to S L (t), S R (t) judges the polarization state change corresponding to the fiber fault event when the polarization state changes of the first and second optical signals are recognized, calculates the correlation result between S L (t) and S R (t) And the fiber fault position is calculated according to the symbol index value corresponding to the correlation peak in R(τ)", which can also be executed at the first transceiver or the second transceiver, for example, when the application scenario is a PON network, considering that the computing power of the OLT is stronger than that of the ONU, the above-mentioned link state monitoring and fiber fault positioning can be executed at the OLT.

[0091] Based on this, taking the first transceiver as an example, this embodiment of the invention provides an online link status monitoring and fiber optic fault location method based on service data, applied to the first transceiver in a coherent optical uplink and downlink transmission system, including:

[0092] S1, calculate the Stokes parameter S of the received first optical signal. L (t), obtain the Stokes parameter S of the second optical signal received by the second transceiver. R (t); where the first and second optical signals are coherent optical uplink and downlink signals, respectively;

[0093] S2, according to S L (t), S R (t) When both the first and second optical signals undergo polarization state changes, identify the fiber optic fault event corresponding to the polarization state change, and calculate the S at the time point corresponding to the fiber optic fault event. L (t), S R The correlation results between (t) And calculate the fiber optic fault location based on the sign index value corresponding to the relevant peak in R(τ);

[0094] The fiber optic fault events include fiber breakage events, bending events, and twisting events; Z = Lc·Δt / n, where c is the speed of light, n is the refractive index of the light ray, and L is the total length of the fiber. f s The symbol rate is S; with the first transceiver as a reference, lag is S. L The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the first transceiver end; when the second transceiver end is used as a reference, lag is S. r The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the second transceiver.

[0095] This invention provides a first transceiver in a coherent optical uplink / downlink transmission system, comprising:

[0096] The calculation and acquisition module calculates the Stokes parameter S of the received first optical signal. L (t), obtain the Stokes parameter S of the second optical signal received by the second transceiver. R (t); where the first and second optical signals are coherent optical uplink and downlink signals, respectively;

[0097] The link fault detection and location module is used to detect and locate faults based on S. L (t), S R (t) When both the first and second optical signals undergo polarization state changes, identify the fiber optic fault event corresponding to the polarization state change, and calculate the S at the time point corresponding to the fiber optic fault event. L (t), SR the correlation result between (t) and (t) and calculating the fiber fault position according to the symbol index value corresponding to the correlation peak in R(τ);

[0098] wherein the fiber fault event includes an optical fiber breakpoint event, a bending event and a twisting event; Z=L-c·Δt / n, c is the speed of light, n is the optical refractive index, L is the total length of the optical fiber, f s is the symbol rate; when the first transceiver is taken as a reference, lag is S L is the symbol rate; when the second transceiver is taken as a reference, lag is S R is the symbol rate; when the second transceiver is taken as a reference, lag is S

[0099] Those skilled in the art can understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for online link status monitoring and fiber optic fault location based on service data, characterized in that, include: S1, Real-time synchronous acquisition of the Stokes parameters S of the first and second optical signals received one-to-one from the first and second transceivers in the coherent optical uplink and downlink transmission system. L (t), S R (t); Among them, the first and second optical signals are coherent optical uplink and downlink signals, respectively; S2, according to S L (t), S R (t) When both the first and second optical signals undergo polarization state changes, identify the fiber optic fault event corresponding to the polarization state change, and calculate the S at the time point corresponding to the fiber optic fault event. L (t), S R The correlation results between (t) And calculate the fiber optic fault location based on the sign index value corresponding to the relevant peak in R(τ); The fiber optic fault events include fiber breakage events, bending events, and twisting events; Z = Lc·Δt / n, where c is the speed of light, n is the refractive index of the light ray, and L is the total length of the fiber. f s The sign rate is S, * is the conjugate operator; when the first sender and receiver are referenced, lag is S. L The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the first transceiver end; when the second transceiver end is used as a reference, lag is S. R The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the second transceiver.

2. The method as described in claim 1, characterized in that, For any optical signal, its Stokes parameter S(t) = {S0, S1, S2, S3}, H is the channel transmission matrix obtained by equalizing any of the optical signals, and is h xx h xy h yx h yy These are the tap coefficients of the four filters used in the equalization process.

3. The method as described in claim 2, characterized in that, Before performing equalization processing on any of the optical signals, the method further includes: Residual dispersion compensation and frame synchronization processing are performed on any of the optical signals.

4. An online link status monitoring and fiber optic fault location device based on service data, characterized in that, include: The acquisition module is used to synchronously acquire, in real time, the Stokes parameters S of the first and second optical signals received one-to-one by the first and second transceivers in the coherent optical uplink and downlink transmission system. L (t), S R (t); Among them, the first and second optical signals are coherent optical uplink and downlink signals, respectively; The link fault detection and location module is used to detect and locate faults based on S. L (t), S R (t) When both the first and second optical signals undergo polarization state changes, identify the fiber optic fault event corresponding to the polarization state change, and calculate the S at the time point corresponding to the fiber optic fault event. L (t), S R The correlation results between (t) And calculate the fiber optic fault location based on the sign index value corresponding to the relevant peak in R(τ); Where Z = Lc·Δt / n, c is the speed of light, n is the refractive index of the light ray, and L is the total length of the optical fiber. f s The symbol rate is S; with the first transceiver as a reference, lag is S. L The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the first transceiver end; when the second transceiver end is used as a reference, lag is S. R The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the second transceiver.

5. A coherent optical uplink and downlink transmission system, comprising a first transceiver end and a second transceiver end, characterized in that, The system also includes the online link status monitoring and fiber optic fault location device based on service data as described in claim 4.

6. An electronic device, characterized in that, include: Computer-readable storage media and processors; The computer-readable storage medium is used to store executable instructions; The processor is configured to read executable instructions stored in the computer-readable storage medium and execute the method as described in any one of claims 1-3.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a processor to perform the method as described in any one of claims 1-3.

8. A method for online link status monitoring and fiber optic fault location based on service data, applied to the first transceiver end of a coherent optical uplink and downlink transmission system, characterized in that... include: S1, calculate the Stokes parameter S of the received first optical signal. L (t), obtain the Stokes parameter S of the second optical signal received by the second transceiver. R (t); Among them, the first and second optical signals are coherent optical uplink and downlink signals, respectively; S2, according to S L (t), S R (t) When both the first and second optical signals undergo polarization state changes, identify the fiber optic fault event corresponding to the polarization state change, and calculate the S at the time point corresponding to the fiber optic fault event. L (t), S R The correlation results between (t) And calculate the fiber optic fault location based on the sign index value corresponding to the relevant peak in R(τ); The fiber optic fault events include fiber breakage events, bending events, and twisting events; Z = Lc·Δt / n, where c is the speed of light, n is the refractive index of the light ray, and L is the total length of the fiber. f s The symbol rate is S; with the first transceiver as a reference, lag is S. L The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the first transceiver end; when the second transceiver end is used as a reference, lag is S. R The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the second transceiver.

9. A first transceiver in a coherent optical uplink / downlink transmission system, characterized in that, include: The calculation and acquisition module is used to calculate the Stokes parameter S of the received first optical signal. L (t), obtain the Stokes parameter S of the second optical signal received by the second transceiver. R (t); Among them, the first and second optical signals are coherent optical uplink and downlink signals, respectively; The link fault detection and location module is used to detect and locate faults based on S. L (t), S R (t) When both the first and second optical signals undergo polarization state changes, identify the fiber optic fault event corresponding to the polarization state change, and calculate the S at the time point corresponding to the fiber optic fault event. L (t), S R The correlation results between (t) And calculate the fiber optic fault location based on the sign index value corresponding to the relevant peak in R(τ); The fiber optic fault events include fiber breakage events, bending events, and twisting events. Z = Lc·Δt / n, where c is the speed of light, n is the refractive index of the light ray, and L is the total length of the optical fiber. f s The symbol rate is S; with the first transceiver as a reference, lag is S. L The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the first transceiver end; when the second transceiver end is used as a reference, lag is S. r The index value corresponding to the relevant peak in (t) indicates that the fiber optic fault location is Z away from the second transceiver.

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