WO2017070826A1

WO2017070826A1 - Clock performance monitoring system, method and device

Info

Publication number: WO2017070826A1
Application number: PCT/CN2015/092867
Authority: WO
Inventors: 万文通
Original assignee: 华为技术有限公司
Priority date: 2015-10-26
Filing date: 2015-10-26
Publication date: 2017-05-04
Also published as: CN108141282A; CN108141282B

Abstract

A clock performance monitoring system, method and device, in which according to one output signal of a loop filter (24), the value of optical dispersion compensation signal C and the values of polarization tracking coefficients A and A' can be updated, thereby not only monitoring the effect of optical dispersion through the change of C value but also tracking polarization through the change of A and A' values, and because the phase portion of C value compensation is also capable of compensating for the phase variation caused by laser frequency domain offset, the optical dispersion compensation and the effect of laser frequency domain offset on phase can be addressed simultaneously, thereby realizing an effect of simultaneously monitoring the influence of PMD dispersion, optical dispersion and inconsistently receiving/transmitting the laser center frequency on the performance of a clock recovery module, solving the poor monitoring effect of the existing clock performance monitoring mode, enhancing the comprehensiveness and accuracy of monitoring and further improving the system performance.

Description

Clock performance monitoring system, method and device

Technical field

The present invention relates to the field of clock recovery technologies, and in particular, to a clock performance monitoring system, method, and apparatus.

Background technique

In a coherent optical communication system, after the photoelectric conversion is performed, the clock receiving end needs to perform algorithm processing in the digital domain, wherein the speed of the algorithm processing and the speed of data transmission need to be consistent at all times, so as to ensure all transmitted data. Can be processed in a timely manner, that is, clock synchronization.

Specifically, in a coherent optical communication system, clock synchronization is typically implemented by a clock recovery module. The position of the clock recovery module in the coherent optical communication system can be as shown in FIG. 1 . It can be seen from FIG. 1 that after the dispersion estimation and compensation module completes the partial light dispersion damage of the x1 and y1 signals, the x2 and y2 signals are output to the clock recovery module; the clock recovery module performs clock compensation processing on the x2 and y2 signals, and outputs x3. And the y3 signal is sent to the depolarization module, and the depolarization module performs depolarization processing on the x3 and y3 signals, and outputs the x4 and y4 signals to other digital processing units; and the clock recovery module can also output a phase deviation for indicating the ADC sampling. The error signal is sent to the loop filter, and the loop filter generates a corresponding control signal according to the error signal to control the voltage controlled oscillator to adjust the sampling phase and frequency of the ADC, thereby completing the synchronization of the receiving system.

That is, the clock recovery module can receive the corresponding photoelectrically converted electrical signal and process the received electrical signal to obtain an estimated value of the sampling phase deviation of the ADC output, which can be fed back to the ADC to make the ADC The sampling phase is positively at the optimal decision point of the signal symbol. Only such a signal with the correct phase of the sampling phase can be optimally received by the receiving system. It can be seen that the clock recovery module is an inseparable part of the communication system, and its performance will directly affect the system performance. Therefore, in the clock recovery module, it is often necessary to set a corresponding monitoring device, such as a signal characteristic parameter modifier, to monitor the clock performance.

Specifically, for an existing clock recovery module having a corresponding clock performance monitoring function, The monitoring device included therein, that is, the signal characteristic parameter modifier, can be specifically used to feed back to the signal adjuster two polarization state tracking coefficients A, A' for compensating the polarization state tracking error, so that the signal adjuster can be based on the two polarizations Tracking coefficient A, A', performing polarization state tracking operation on the received signal; and, based on the signal from the phase detector (specifically, the sampling clock obtained by detecting the deviation of the signal input from the signal conditioner by the phase detector) The real part of the error signal), by setting the algorithm to find two suitable polarization state tracking coefficients A, A' to correct the signal, that is, updating the polarization state tracking coefficients A, A', so that the complex signal output by the phase detector The real part of the modulo or complex signal is always kept the maximum. At this time, the signal characteristic parameter modifier can consider that the current signal characteristic parameters are more suitable, and the signal characteristics can not be updated.

It can be seen from the above that at present, the entire clock recovery module monitors the clock performance through the real part of the complex signal output of the phase detector or the real part of the complex signal, and the modulus of the complex signal output through the phase detector is When the real part of the complex signal is used to monitor the clock performance, only the polarization state tracking coefficients A, A' for compensating the polarization state tracking error are considered, resulting in PMD (Polarization Mode Dispersion) which can only be used for monitoring signals. The feature, that is, only the tracking of the polarization state can be maintained, so that the monitoring effect is not good.

Summary of the invention

The embodiment of the invention provides a clock performance monitoring system, method and device, which can simultaneously monitor PMD dispersion, optical dispersion and the influence of the center frequency of the transceiver laser on the performance of the clock recovery module, so as to solve the existing clock performance monitoring mode. Monitor poor performance.

In a first aspect, a clock performance monitoring system is provided, including a signal clock compensator, a signal adjuster, a phase detector, a loop filter, an interpolation controller, and a clock performance monitoring device, wherein:

The clock performance monitoring device is configured to feed back a light dispersion compensation signal for compensating residual light dispersion to the signal clock compensator, and feed back two polarization state tracking coefficients for compensating the polarization state tracking error to the signal adjuster; and receive The signal fed back by the loop filter updates the two polarization state tracking coefficients and the light dispersion compensation signal according to the signal fed back by the loop filter, so that the values of the two polarization state tracking coefficients and the light dispersion compensation signal occur. Loop filter feedback The signal is a fixed value within the set time;

The signal clock compensator is configured to receive the received chromatic dispersion estimation and compensation module from the clock performance monitoring system according to the optical dispersion compensation signal fed back by the clock performance monitoring device and the phase compensation value fed back by the interpolation controller The two signals are phase compensated, and the compensated two signals are outputted to the signal adjuster and the depolarization module connected to the clock performance monitoring system;

The signal adjuster is configured to perform polarization state tracking on the received signal according to two polarization state tracking coefficients fed back by the clock performance monitoring device, to obtain a positive spectrum signal and a negative spectrum signal, and output the signal to the phase detector;

The phase detector is configured to detect a sampling clock deviation of the received signal, obtain a sampling clock error signal, and output an imaginary part of the sampling clock error signal to a loop filter and an analog to digital converter;

The loop filter is configured to filter the signal from the phase detector, and output the filtered signal to the interpolation controller, and output the filtered signal to the clock performance monitoring device. ;

The interpolation controller is configured to feed back a phase compensation value to the signal clock compensator, and update the phase compensation value fed back to the signal clock compensator according to the signal from the loop filter.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the clock performance monitoring apparatus is specifically configured to separately perform tracking coefficients of respective polarization states according to a signal fed back by the loop filter, and calculate each The polarization state tracks the direction of change of the coefficient, and according to the direction of change of the tracking coefficient of each polarization state, the corresponding polarization state tracking coefficient is updated according to the set first step length; wherein the derivative obtained by the derivative is positive and the direction of change is increased. , if negative, the direction of change is reduced; and,

According to the signal fed back by the loop filter, the value of the optical dispersion compensation signal is scanned according to the set value range of the set light dispersion compensation signal and the set second step, and the signal of the loop filter feedback is determined. Whether the fixed time value is a fixed value, if it is a fixed value, the scanning of the light dispersion compensation signal is stopped, and the light dispersion compensation signal when the signal fed back by the loop filter is a fixed value within the set time is used as A light dispersion compensation signal that needs to be fed back to the signal clock compensator.

In conjunction with a possible implementation of the first aspect, a second possible implementation in the first aspect In the mode, the value of the light dispersion compensation signal is [0, 1], wherein 0 means no movement is required, and 1 means moving one sample interval forward.

In conjunction with the first aspect, in a third possible implementation manner of the first aspect, the signal clock compensator is specifically configured to perform Fourier on the channel signal for each of the received two signals. Transforming, obtaining a corresponding frequency domain signal, and performing splitting of the positive and negative frequency information on the frequency domain signal, obtaining a positive spectrum sub-signal and a negative spectrum sub-signal corresponding to the path signal; and feeding back according to the clock performance monitoring device The optical dispersion compensation signal and the phase compensation value fed back by the interpolation controller perform phase shift processing on the frequency domain corresponding to the positive spectrum sub-signal corresponding to the path signal, and according to the phase compensation value fed back by the interpolation controller, The negative spectral sub-signal corresponding to the path signal is subjected to phase shift processing in the frequency domain; and the phase-shifted processed positive-spectrum sub-signal corresponding to the path signal and the phase-shifted processed negative-spectrum sub-signal The spectrum is combined to obtain a compensated signal corresponding to the path signal.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the signal adjuster, specifically for the first one of the received two signals, is related to the first road signal Corresponding positive spectral sub-signals and negative spectral sub-signals corresponding to the first tracking coefficients of the two polarization tracking coefficients fed back by the clock performance monitoring device, to obtain the corrected first positive spectral sub-signals and the first negative spectral sub-segments a signal; for the second signal of the received two signals, the positive spectrum sub-signal and the negative spectrum sub-signal corresponding to the second path signal are multiplied by two polarization state tracking fed back by the clock performance monitoring device a second tracking coefficient in the coefficient, the corrected second positive spectral sub-signal and the second negative spectral sub-signal are obtained; and the first positive spectral sub-signal and the second positive spectral sub-signal are correspondingly added to obtain one positive spectral signal The first negative spectral sub-signal and the second negative spectral sub-signal are correspondingly added to obtain a negative spectral signal.

With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the loop filter is specifically configured to divide the received signal into two identical signals, and multiply one signal by a set proportional coefficient. The other signal is multiplied by the set integral coefficient, and the signal multiplied by the set integral coefficient is added to the value output by the delayer to be divided into two sub-signals, and one sub-signal is multiplied by the set proportional coefficient. The signals are added and output as the first output signal to the interpolation controller, and the other sub-signal The second output signal is fed back to the clock performance monitoring device.

With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the interpolation controller is specifically configured to limit a phase compensation value fed back to the signal clock compensator according to a signal from the loop filter Move within a range of sample intervals.

In conjunction with the sixth possible implementation of the first aspect, in a seventh possible implementation manner of the first aspect, the phase compensation value has a value range of [0, 1], where 0 indicates that no movement is required. , 1 means moving forward one sample interval.

In a second aspect, a clock performance monitoring method is provided, including:

The clock performance monitoring device receives the signal fed back by the loop filter;

And an optical dispersion compensation signal for compensating residual light dispersion fed back to the signal clock compensator by the clock performance monitoring device according to the signal fed back by the loop filter, and the clock performance monitoring device feeding back to the signal adjuster The two polarization state tracking coefficients for compensating the polarization state tracking error are updated, so that when the values of the two polarization state tracking coefficients and the light dispersion compensation signal change, the signal fed back by the loop filter is fixed within the set time. value;

And determining a light dispersion compensation signal when the signal fed back by the loop filter is a fixed value within a set time is fed back to the signal clock compensator, so that the signal clock compensator compensates the light dispersion compensation signal according to the clock performance monitoring device, Receiving two signals from the dispersion estimation and compensation module for phase compensation and outputting the compensated two signals to the signal adjuster; and, when determining that the loop filter feedback signal is a fixed value within the set time The two polarization state tracking coefficients are fed back to the signal adjuster to cause the signal adjuster to perform polarization state tracking on the received signal from the signal clock compensator according to the two polarization state tracking coefficients fed back by the clock performance monitoring device.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the light that is fed back to the signal clock compensator and compensated for residual light dispersion is fed back by the clock performance monitoring device according to the signal fed back by the loop filter. The dispersion compensation signal, and the two polarization state tracking coefficients of the clock performance monitoring device fed back to the signal adjuster for compensating for the polarization state tracking error are updated, including:

According to the signal fed back by the loop filter, the tracking coefficients of the respective polarization states are respectively obtained, and the changing direction of the tracking coefficients of the respective polarization states is calculated, and according to the changing direction of the tracking coefficients of the respective polarization states, according to the setting The first step of the update is to update the corresponding polarization state tracking coefficient; wherein, the derivative obtained by the derivative is positive, the direction of change is increased, and the direction of change is negative, and the direction of change is reduced; and, according to the signal fed back by the loop filter, according to the signal The value range of the determined light dispersion compensation signal and the set second step length scan the value of the light dispersion compensation signal to determine whether the signal fed back by the loop filter is a fixed value within the set time, if When a fixed value is used, the scanning of the optical dispersion compensation signal is stopped, and the optical dispersion compensation signal when the signal fed back by the loop filter is a fixed value within the set time is used as the light dispersion compensation required to be fed back to the signal clock compensator. signal.

With reference to the first possible implementation of the second aspect, in a second possible implementation manner of the second aspect, the optical dispersion compensation signal has a value range of [0, 1], where 0 indicates that Move, 1 means move forward one sample interval.

In a third aspect, a clock performance monitoring apparatus is provided, including:

a receiving module, configured to receive a signal fed back by the loop filter;

a processing module, configured to, according to a signal fed back by the loop filter, a light dispersion compensation signal for compensating residual light dispersion fed back to the signal clock compensator, and two signals for compensating for polarization state tracking error fed back to the signal adjuster The polarization tracking coefficients are updated such that when the two polarization state tracking coefficients and the value of the light dispersion compensation signal change, the signal fed back by the loop filter is a fixed value within a set time;

a transmitting module, configured to feed back, to the signal clock compensator, the optical dispersion compensation signal when the signal fed back by the loop filter is a fixed value within a set time, so that the signal clock compensator monitors the light according to the clock performance monitoring device a dispersion compensation signal, phase-compensating the received two signals from the dispersion estimation and compensation module and outputting the compensated two signals to the signal adjuster; and determining the signal fed back by the loop filter within the set time The two polarization state tracking coefficients for a fixed value are fed back to the signal adjuster to cause the signal adjuster to polarize the received signal from the signal clock compensator according to the two polarization state tracking coefficients fed back by the clock performance monitoring device. Status tracking.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the processing module is specifically configured to perform, according to a feedback signal of the loop filter, a tracking coefficient of each polarization state, and calculate Each polarization state tracks the direction of change of the coefficient, and according to the direction of change of the tracking coefficient of each polarization state, the corresponding polarization state tracking coefficient is updated according to the set first step length; wherein the derived derivative is a regular change direction Increase, if it is negative, the direction of change is reduced; and, according to the signal fed back by the loop filter, according to the value range of the set light dispersion compensation signal and the set second step length, the value of the light dispersion compensation signal is Scan to determine whether the signal fed back by the loop filter is a fixed value within a set time. If it is a fixed value, the scanning of the optical dispersion compensation signal is stopped, and the signal fed back by the loop filter is set at a set time. The light dispersion compensation signal when the value is a fixed value is used as the light dispersion compensation signal that needs to be fed back to the signal clock compensator.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the optical dispersion compensation signal has a value range of [0, 1], where 0 indicates that Move, 1 means move forward one sample interval.

In a fourth aspect, a clock performance monitoring apparatus is provided, including:

a receiver for receiving a signal fed back by the loop filter;

a processor, configured to, according to a signal fed back by the loop filter, a light dispersion compensation signal for compensating for residual light dispersion fed back to the signal clock compensator, and two signals for compensating for polarization state tracking error fed back to the signal adjuster The polarization tracking coefficients are updated such that when the two polarization state tracking coefficients and the value of the light dispersion compensation signal change, the signal fed back by the loop filter is a fixed value within a set time;

a transmitter, configured to feed back a light dispersion compensation signal when the signal fed back by the loop filter is a fixed value to the signal clock compensator, so that the signal clock compensator monitors the light according to the clock performance monitoring device a dispersion compensation signal, phase-compensating the received two signals from the dispersion estimation and compensation module and outputting the compensated two signals to the signal adjuster; and determining the signal fed back by the loop filter within the set time The two polarization state tracking coefficients for a fixed value are fed back to the signal adjuster to cause the signal adjuster to polarize the received signal from the signal clock compensator according to the two polarization state tracking coefficients fed back by the clock performance monitoring device. Status tracking.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the processor is specifically configured to perform, according to a feedback signal of the loop filter, a tracking coefficient of each polarization state, and calculate Each polarization state tracks the direction of change of the coefficient, and according to the direction of change of the tracking coefficient of each polarization state, the corresponding polarization state tracking coefficient is updated according to the set first step length; wherein the derived derivative is a regular change direction Increase, if it is negative, the direction of change is reduced; and, according to the signal fed back by the loop filter, according to the value range of the set light dispersion compensation signal and the set second step length, the value of the light dispersion compensation signal is Scan to determine whether the signal fed back by the loop filter is a fixed value within a set time. If it is a fixed value, the scanning of the optical dispersion compensation signal is stopped, and the signal fed back by the loop filter is set at a set time. The light dispersion compensation signal when the value is a fixed value is used as the light dispersion compensation signal that needs to be fed back to the signal clock compensator.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the optical dispersion compensation signal has a value range of [0, 1], where 0 indicates that Move, 1 means move forward one sample interval.

According to the system, method and device provided in the first to fourth aspects, the value of the optical dispersion compensation signal C for compensating the residual light dispersion and the tracking error for compensating the polarization state can be updated according to an output signal of the loop filter. The values of the polarization tracking coefficients A, A' are such that when the above three parameters, namely the optical dispersion compensation signal C and the values of the two polarization state tracking coefficients A, A', change, the signal fed back by the loop filter It is a fixed value within the set time, so that not only the influence of the light dispersion can be monitored by the change of the C value, but also the polarization state can be tracked by the change of the A and A' values. Moreover, since the phase portion compensated by the C value can also compensate for the phase change caused by the frequency domain offset of the laser, the effect of the laser frequency offset on the phase is also handled while the optical dispersion compensation is processed, thereby achieving It can simultaneously monitor the effects of PMD dispersion, light dispersion, and the inconsistent center frequency of the transceiver laser on the performance of the clock recovery module, and solve the problem of poor monitoring performance of the existing clock performance monitoring mode, and improve the comprehensiveness and accuracy of the monitoring. Sex, which in turn improves the performance of the system.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those of ordinary skill in the art, without creative work Further drawings can also be obtained from these drawings.

FIG. 1 is a schematic diagram showing the position of a clock recovery module in a coherent optical communication system;

FIG. 2 is a schematic structural diagram of a clock recovery module with a clock performance monitoring function;

3 is a schematic structural diagram of a clock performance monitoring system according to an embodiment of the present invention;

4 is a schematic structural diagram of a signal clock compensator according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a signal regulator according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a loop filter according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart diagram of a clock performance monitoring method according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a clock performance monitoring apparatus according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of another clock performance monitoring apparatus according to an embodiment of the present invention.

detailed description

Specifically, as shown in FIG. 2, it is a schematic structural diagram of a clock recovery module having a corresponding clock performance monitoring function. As can be seen from FIG. 2, the clock recovery module can include a signal clock compensator 11, a signal adjuster 12, a phase detector 13, a loop filter 14, an interpolation controller 15, and a signal characteristic parameter modifier 16, wherein:

The signal clock compensator 11 can be configured to receive X and Y signals input by the outside world (for example, two input signals from the dispersion estimation and compensation module), and according to the phase compensation value B fed back by the interpolation controller 15 (initial stage, the The value is a set initial value, such as 0), phase compensation is performed on the two signals by time domain interpolation, and the compensated X and Y signals are outputted to the signal adjuster 12 and the clock recovery in the system. The next unit connected to the module (such as the depolarization module); the signal adjuster 12 can be used to compensate the polarization tracking coefficients A, A' of the polarization state tracking error according to the signal characteristic parameter modifier 16 (initial stage, The two values are respectively a set initial value, such as A=1, A'=0, etc., and the polarization state tracking operation is performed on the received signal to obtain a positive spectrum signal and a negative spectrum signal, and output to Phase detector 13; phase detector 13 can be used to detect the sampling of the received signal Clock deviation, obtaining a sampling clock error signal, and outputting the imaginary part of the error signal to the loop filter 14 and the ADC, and outputting the real part of the error signal to the signal characteristic parameter modifier 16; the loop filter 14 can be used The signal from the phase detector 13 is filtered to filter out the high frequency portion of the input signal, and the filtered signal is output to the interpolation controller 15; the interpolation controller 15 can be used to signal from the loop filter 14. The phase compensation value B used for phase compensation of the signal clock compensator 11 is updated; the signal characteristic parameter modifier 16 can be used to find two suitable polarization states by setting the algorithm according to the signal from the phase detector 13. Tracking coefficients A, A' to correct the signal, that is, updating the polarization tracking coefficients A, A', so that the real part of the complex signal of the complex signal output by the phase detector 13 or the complex signal is always kept maximum, then the signal characteristics The parameter modifier 16 can assume that the current signal characteristic parameters are more suitable and the signal characteristics may not be updated.

That is to say, the entire clock recovery module monitors the clock performance through the real part of the complex signal outputted by the phase detector or the real part of the complex signal, and the modulo or complex signal of the complex signal output through the phase detector When the real part monitors the clock performance, only the polarization state tracking coefficients A, A' for compensating the polarization state tracking error are considered, resulting in PMD characteristics that can only be used for monitoring signals, that is, only tracking of the polarization state can be maintained, The monitoring effect is not good.

The embodiment of the invention provides a clock performance monitoring system, method and device, which can update the value of the optical dispersion compensation signal C for compensating residual light dispersion and compensate for the polarization state according to an output signal of the loop filter. The values of the polarization tracking coefficients A, A' of the tracking error are such that when the above three parameters, namely the optical dispersion compensation signal C and the values of the two polarization state tracking coefficients A, A', change, the loop filter feedback The signal is a fixed value within the set time, so that not only the influence of the light dispersion can be monitored by the change of the C value, but also the polarization state can be tracked by the change of the A and A' values. Moreover, since the phase portion compensated by the C value can also compensate for the phase change caused by the frequency domain offset of the laser, the effect of the laser frequency offset on the phase is also handled while the optical dispersion compensation is processed, thereby achieving It can simultaneously monitor the effects of PMD dispersion, light dispersion, and the inconsistent center frequency of the transceiver laser on the performance of the clock recovery module, and solve the problem of poor monitoring performance of the existing clock performance monitoring mode, and improve the comprehensiveness and accuracy of the monitoring. Sex, which in turn improves the performance of the system.

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1:

The first embodiment of the present invention provides a clock performance monitoring system, which can be applied to a coherent optical communication system or an incoherent optical communication system, for example, can be applied to a mobile network, a microwave network, or a metropolitan area network. In the system with the ADC sampling and clock recovery unit, the embodiment of the present invention does not describe this. Specifically, as shown in FIG. 3 , which is a schematic structural diagram of a clock performance monitoring system according to the first embodiment of the present invention, the clock performance monitoring system may include a signal clock compensator 21 , a signal adjuster 22 , and a phase detector 23 . a loop filter 24, an interpolation controller 25, and a clock performance monitoring device 26, wherein:

The clock performance monitoring device 26 can be configured to feed back a light dispersion compensation signal (which can be expressed as C) for compensating residual light dispersion to the signal clock compensator 21, and in the initial stage, the value of C can usually be a set value. If it is 0, etc., the two polarization state tracking coefficients for compensating the polarization state tracking error are fed back to the signal adjuster 22 (represented as A, A', respectively, and, in the initial stage, the values of A and A' are usually It may be a set value, such as A=1, A'=0, etc.); and, receiving the signal fed back by the loop filter 24, and tracking the coefficients of the two polarization states according to the signal fed back by the loop filter 24 and The light dispersion compensation signal is updated such that when the values of the two polarization state tracking coefficients and the light dispersion compensation signal change, the signal fed back by the loop filter 24 is a fixed value within a set time;

The signal clock compensator 21 can be configured to estimate the chromatic dispersion from the received clock performance monitoring system according to the optical dispersion compensation signal fed back by the clock performance monitoring device 26 and the phase compensation value fed back by the interpolation controller 25. The two signals of the compensation module (such as the X channel signal and the Y channel signal) are phase compensated, and output the compensated two signals to the signal adjuster 22 and the depolarization module connected to the clock performance monitoring system;

The signal adjuster 22 can be used to monitor two polarization states according to the clock performance monitoring device 26. Tracking coefficient, performing polarization state tracking on the received signal, obtaining a positive spectrum signal and a negative spectrum signal, and outputting to the phase detector 23;

The phase detector 23 can be configured to detect a sampling clock deviation of the received signal, obtain a sampling clock error signal, and output the imaginary part of the sampling clock error signal to the loop filter 24 and the analog to digital converter (ie, ADC);

The loop filter 24 can be used to filter the signal from the phase detector 23, and output the filtered signal to the interpolation controller 25, and output the filtered signal to the clock. Performance monitoring device 26;

The interpolation controller 25 can be used to feed back the phase compensation value to the signal clock compensator 21 and update the phase compensation value fed back to the signal clock compensator 21 based on the signal from the loop filter 24.

It can be seen from the above that in the clock performance monitoring system of the present invention, the clock performance monitoring device 26 is no longer connected to an output of the phase detector 23, but is connected to an output of the loop filter 24; The clock performance monitoring device 26 can be coupled to an input of the signal adjuster 22 to feed back two polarization tracking coefficients for compensating for the polarization state tracking error, and can also be coupled to the signal clock compensator 21 The input terminals are connected to feed back a light dispersion compensation signal for compensating for residual light dispersion, so that the value of the light dispersion compensation signal C for compensating for residual light dispersion is updated according to one output signal of the loop filter 24. And a value of the polarization state tracking coefficients A, A' for compensating for the polarization state tracking error, such that when the above three parameters, that is, the two polarization state tracking coefficients and the value of the light dispersion compensation signal change, the loop filter The feedback signal is a fixed value for the set time, so that the influence of the light dispersion can be monitored not only by the change of the C value, but also by the A and A' values. Change to track the polarization state. Moreover, since the phase portion compensated by the C value can also compensate for the phase change caused by the frequency domain offset of the laser, the effect of the laser frequency offset on the phase is also handled while the optical dispersion compensation is processed, thereby achieving It can simultaneously monitor the effects of PMD dispersion, light dispersion, and the inconsistent center frequency of the transceiver laser on the performance of the clock recovery module, and solve the problem of poor monitoring performance of the existing clock performance monitoring mode, and improve the comprehensiveness and accuracy of the monitoring. Sex, which in turn improves the performance of the system.

In the following, the function and specific implementation mode of each module in the system will be further explained according to the direction of the signal flow in the system:

As can be seen from FIG. 3, the externally input X and Y signals are first input to the signal clock compensator 21, and the signal dispersion compensator 21 uses the optical dispersion compensation signal C fed back by the clock performance monitoring device 26 and the feedback from the interpolation controller 25. Two parameters of phase compensation value B (initial phase, specifically the initial values of two parameters B and C, such as 0) can be compensated.

Specifically, as shown in FIG. 4, it is a possible structural diagram of the signal clock compensator 21 in the embodiment of the present invention.

The signal clock compensator 21 is specifically configured to perform Fourier transform on each of the received two signals (such as an X channel signal and a Y channel signal) to obtain a corresponding frequency domain signal. And performing frequency division of the positive and negative frequency information on the frequency domain signal to obtain a positive spectrum sub-signal and a negative spectrum sub-signal corresponding to the path signal; and the optical dispersion compensation signal C and the interpolation according to the clock performance monitoring device 26 The phase compensation value B fed back by the controller 25 performs phase shift processing in the frequency domain on the positive spectrum sub-signal corresponding to the path signal, and the phase compensation value B fed back from the interpolation controller 25, The negative spectral sub-signal corresponding to the signal is subjected to phase shift processing in the frequency domain; and the phase shift processed positive spectral sub-signal corresponding to the path signal and the phase-shifted negative spectral sub-signal are subjected to spectrum Combine to obtain a compensated signal corresponding to the way signal.

That is to say, the signal clock compensator 21 can realize phase compensation of the signal by directly performing corresponding phase shift in the frequency domain, thereby greatly improving the efficiency of phase compensation.

Further, it should be noted that, as can be seen from FIG. 4, the signal clock compensator 21 can be specifically configured to multiply each channel signal by multiplying a positive spectrum sub-signal corresponding to each channel signal by a first function. Corresponding positive spectrum sub-signals perform phase shift processing in the frequency domain; and, by multiplying the negative spectral sub-signals corresponding to each of the signals by a second function, the negative spectral sub-corresponding to each of the signals The signal is subjected to phase shift processing in the frequency domain and will not be described here.

Wherein, the first function may be represented as Exp(-j*2pi*f*(B+C)); the second function may be represented as Exp(-j*2pi*f*B); wherein, Exp represents Natural logarithm, pi is pi, j is imaginary, f is an array of signal frequency axis values, B is a phase compensation value fed back by the interpolation controller 25, and C is a light dispersion compensation signal fed back by the clock performance monitoring device 26.

Further, it should be noted that the signal clock compensator 21 can perform phase compensation on the received signal in a frequency domain compensation manner, and can also adopt the time domain interpolation method described in the prior art. The received signal is phase-compensated. In this case, the specific compensation mode is similar to the prior art and will not be described here.

However, since the phase compensation is performed by the time domain interpolation method, the signal clock compensator 21 needs to be composed of a large number of multipliers (far more than the four multipliers involved in FIG. 4), resulting in a relatively simple device structure. In the embodiment of the present invention, in order to avoid the above problem, the signal clock compensator 21 can generally perform phase compensation on the received signal by using frequency domain compensation. In order to save a lot of multiplier resources and reduce the power consumption of the system.

Further, as can be seen from FIG. 3, the signal compensated by the signal clock compensator 21 enters the signal adjuster 22 for the polarization state tracking operation.

Specifically, as shown in FIG. 5, it is a possible structural diagram of the signal adjuster 22 described in the embodiment of the present invention. As can be seen from Figure 5:

The signal adjuster 22 is specifically configured to be used for the first channel signal (such as the X channel signal) of the received two signals (such as the X channel signal and the Y channel signal) corresponding to the first channel signal. The positive spectral sub-signal and the negative spectral sub-signal are multiplied by the first tracking coefficient (such as A) of the two polarization tracking coefficients fed back by the clock performance monitoring device 26 to obtain the corrected first positive spectral sub-signal and the first a negative spectrum sub-signal; for a second one of the received two signals (such as a Y-channel signal), multiplying the positive-spectrum sub-signal and the negative-spectrum sub-signal corresponding to the second-channel signal by clock performance The second tracking coefficient (such as A') of the two polarization tracking coefficients fed back by the monitoring device 26 obtains the corrected second positive spectral sub-signal and the second negative spectral sub-signal; and the first positive spectral sub-signal and The second positive spectral sub-signals are added correspondingly to obtain a positive spectral signal, and the first negative spectral sub-signal and the second negative spectral sub-signal are correspondingly added to obtain a negative spectral signal.

Wherein, for the two signals received by the signal adjuster 22 (such as X channel signal and Y channel signal) Each of the signals in the path, the positive spectrum sub-signal corresponding to the path signal and the negative spectrum sub-signal can be obtained according to the Fourier transform process of the signal clock compensator 21 described above. Of course, the signal adjuster 22 itself may also have a corresponding Fourier transform function or the like to perform the Fourier signal on each of the received two signals (such as the X channel signal and the Y channel signal). The leaf transform obtains a corresponding frequency domain signal, and performs splitting of the positive and negative frequency information on the frequency domain signal to obtain a positive spectrum sub-signal and a negative spectrum sub-signal corresponding to the path signal, which are not described herein again.

It can be seen from the above that the signal adjuster 22 can be mainly used to perform the tracking operation of the received signal from the signal clock compensator 21 by using two tracking coefficients A, A' to realize a certain characteristic of the signal. Modifications, such as modifying the phase of the signal to achieve the purpose of rotating the polarization state.

Further, as can be seen from FIG. 3, the signal passing through the signal adjuster 22 will enter the phase detector 23 for phase discrimination processing. The phase detector 23 can be an existing Godard phase detector or the like, which can be mainly used to detect the sampling clock deviation of the signal.

For example, suppose you input a continuous analog signal and sample it through an analog digital sampler at a sampling interval of 1 second. However, due to the problem of the device itself, the sampling interval of the analog digital sampler is not once every 1 second, but once every 1.0001 seconds, then the analog input signal is sampled by the 1.0001 second sampling interval and output to the phase detector 23. The phaser 23 calculates the phase difference between the 1.0001 second interval and the 1 second interval. Based on this phase difference, other controls can be added to adjust the 1.0001 second interval back to the correct 1 second interval sample.

Further, it should be noted that the imaginary part of the signal output by the phase detector 23 is the phase-detection signal, and as can be seen from FIG. 3, the phase-detection signals are respectively sent to the path for controlling the ADC clock and the interpolation control path. In addition, as can be seen from FIG. 3, the phase-detection signal usually needs to be filtered by a loop filter 24 before being sent to the interpolation control path.

Specifically, the loop filter 24 is generally a proportional-integral filter, and is mainly used for filtering the received signal to filter out the high-frequency portion of the signal to adjust the frequency domain bandwidth of the system to the entire system. effect.

Optionally, as shown in FIG. 6, it is one of the loop filters 24 described in the embodiment of the present invention. A possible schematic diagram of the structure. As can be seen from Figure 6:

The loop filter 24 is specifically configured to divide the received signal into the same two signals, one signal multiplied by a set proportional coefficient (kp as shown in FIG. 6), and the other signal multiplied by the setting. The integral coefficient (ki shown in Figure 6), and the signal multiplied by the set integral coefficient is added to the value output by the delayer (specifically, the delayer can usually delay one sampling period) After splitting into two sub-signals, one sub-signal is added to the signal multiplied by the set proportional coefficient and output as the first output signal (ie, signal output 1 in FIG. 6) to the interpolation controller 25, and the other sub-signal is used as The second output signal (i.e., signal output 2 in FIG. 6) is fed back to the clock performance monitoring device 26.

It can be seen from the above that in the embodiment of the present invention, a signal (ie, signal output 2) can be extracted from the integral path of the loop filter 24 as an input of the clock performance monitoring device 26, and details are not described herein again.

Further, as can be seen from FIG. 3, the first path signal (ie, signal output 1) output by the loop filter 24 will enter the interpolation controller 25 to be phase-aligned by the interpolation controller 25 based on the signal from the loop filter 24. The compensation value B is updated accordingly.

In particular, the interpolation controller 25 is similar to the interpolation controller described in the prior art and is primarily used to implement an ideal integrator function. For example, it can be specifically used to limit the phase compensation value B used when the signal clock compensator 21 performs phase compensation according to the signal from the loop filter within a range of moving a sample interval, that is, limited to [0, 1 In the range, where 0 means no movement is required, and 1 means moving one sample interval forward.

That is to say, the B value output by the interpolation controller 25 needs to be limited. When the output B value is greater than one sampling point, it is necessary to take a portion larger than one sample interval, and the entire sampled signal data is moved forward by one sample interval. This ensures that each output is between 0-1.

Further, as can be seen from FIG. 3, the second path signal (ie, signal output 2) output by the loop filter 24 will enter the clock performance monitoring device 26 to be based on the signal from the loop filter 24 by the clock performance monitoring device 26. The polarization tracking coefficients (ie, A, A') and the optical dispersion compensation signal (ie, C) are updated accordingly.

Optionally, the clock performance monitoring device 26 is specifically configured to be fed back according to the loop filter 24. The signal is obtained by deriving the tracking coefficients of each polarization state (ie, A, A'), calculating the direction of change of the tracking coefficients of each polarization state, and according to the direction of change of the tracking coefficients of each polarization state, according to the set first step length corresponding The polarization state tracking coefficient is updated; wherein the derivative obtained by the derivative is positive, the direction of change is increased, and if it is negative, the direction of change is decreased;

According to the signal fed back by the loop filter 24, the value of the optical dispersion compensation signal (ie, C) is scanned according to the set value range of the set light dispersion compensation signal and the set second step, and the loop filter is judged. 24 The feedback signal is set to a fixed value within the set time (the set time can be flexibly set according to the actual situation) (the fixed value can be flexibly set according to the actual situation). If it is a fixed value, the light is stopped. The dispersion compensation signal is scanned, and the light dispersion compensation signal when the signal fed back by the loop filter 24 is a fixed value within a set time is used as a light dispersion compensation signal to be fed back to the signal clock compensator 21 (if not one) A fixed value will restart the scan).

That is, when the input signal changes within a set smaller range, it can be considered that the C value does not need to be changed, and the C value at this time is the optimum value, and the corresponding light dispersion and the frequency offset of the transmitting and receiving lasers have an influence on the clock. The minimum value is, or it can be approximated that the current value of C can compensate for the dispersion of the dispersion and the residual color of the compensation module and the influence of the frequency offset of the transmitting and receiving laser on the clock.

Wherein, the first step of the setting may be flexibly set according to actual conditions; and, since the value of the first step of the setting will directly affect the speed of the polarization state tracking, it is generally possible to comprehensively consider Depending on the rotation of the polarization state of the entire system. In addition, the second step of the setting may be flexibly set according to actual conditions; and, according to the signal fed back by the loop filter 24, the clock performance monitoring device 26 may generally perform a derivation of the current C value. Depending on the derivative obtained (which is similar to the above description, the derivative obtained by the derivative is positive, the direction of change is increased, and the direction of change is negative), and no further description is made here.

Further, it should be noted that the range of the optical dispersion compensation signal (ie, C) may be generally [0, 1], where 0 means no movement is required, 1 means moving forward by one sample interval, 0.5 Indicates that the half sample interval is moved forward; that is, C can be expressed as the extent of moving a sample interval, and will not be described here.

Further, it should be noted that the above is related to the clock performance monitoring device 26. The description shows that the clock performance monitoring device 26 can have two functions: one is a parameter memory function for storing A, A' and C values; the other is a parameter scanning and judging function, that is, when A, A', After the three parameters of C change, it is judged whether the signal fed back by the loop filter 24 is a fixed value within the set time, and if so, the scanning of the C value is stopped, and if it is not a fixed value, the scanning is started again; A, A' can be kept updated in real time to track the polarization state.

In addition, it should be noted that, in order to enable the clock performance monitoring device 26 to be implemented well, the correspondence between the input signal and A, A', and C may be established in advance, and the input signal pair A, A' is considered. C can be continuously derived. Thus, when receiving the signal fed back by the loop filter 24, the corresponding derivative can be calculated according to the values of A, A', C and the input signal, and the change of the values of A, A', C can be determined according to the sign of the derivative. Direction or amount of change, etc., will not be described here.

The first embodiment of the present invention provides a clock performance monitoring system. According to the technical solution of the first embodiment of the present invention, the optical dispersion compensation signal C for compensating residual light dispersion can be updated according to an output signal of the loop filter. The value of the polarization tracking coefficients A, A' used to compensate the polarization state tracking error, such that the above three parameters, namely the optical dispersion compensation signal C and the two polarization state tracking coefficients A, A' When a change occurs, the signal fed back by the loop filter is a fixed value within the set time, so that not only the influence of the light dispersion can be monitored by the change of the C value, but also the polarization state can be tracked by the change of the A and A' values. . Moreover, since the phase portion compensated by the C value can also compensate for the phase change caused by the frequency domain offset of the laser, the effect of the laser frequency offset on the phase is also handled while the optical dispersion compensation is processed, thereby achieving It can simultaneously monitor the effects of PMD dispersion, light dispersion, and the inconsistent center frequency of the transceiver laser on the performance of the clock recovery module, and solve the problem of poor monitoring performance of the existing clock performance monitoring mode, and improve the comprehensiveness and accuracy of the monitoring. Sex, which in turn improves the performance of the system.

In addition, in the technical solution of the first embodiment of the present invention, the signal clock compensator preferably performs phase compensation on the received signal by means of frequency domain compensation, and thus performs phase compensation with respect to the existing time domain interpolation. In this way, you can save a lot of multiplier resources and reduce system power consumption.

Furthermore, in the technical solution according to the first embodiment of the present invention, the clock error function is no longer based on Calculating the magnitude of the complex result or the real part of the complex result to judge the performance of the clock. Therefore, there is no problem that the optical communication system cannot be stably operated in the spectrum, and the first embodiment of the present invention The technical solution can work in a system with severely compressed signal spectrum, thereby further improving the applicability of the system.

Embodiment 2:

Based on the same inventive concept as the first embodiment of the present invention, the second embodiment of the present invention provides a clock performance monitoring method, as shown in FIG. 7 , which is a schematic flowchart of a clock performance monitoring method according to the second embodiment of the present invention. The method can include the following steps:

Step 701: The clock performance monitoring device receives the signal fed back by the loop filter.

According to the related description of the first embodiment, the signal fed back by the loop filter to the clock performance monitoring device (ie, the signal characteristic parameter modifier) is a signal obtained by filtering the signal from the phase detector. For example, a signal derived from the integral path of the loop filter may not be described herein.

Step 702: The light dispersion compensation signal for compensating residual light dispersion fed back to the signal clock compensator by the clock performance monitoring device according to the signal fed back by the loop filter, and the clock performance monitoring device feeding back to the signal adjuster The two polarization state tracking coefficients for compensating for the polarization state tracking error are updated such that when the values of the two polarization state tracking coefficients and the light dispersion compensation signal change, the signal fed back by the loop filter is within the set time Is a fixed value.

Optionally, according to the signal fed back by the loop filter, the optical dispersion compensation signal for compensating the residual light dispersion fed back to the signal clock compensator, and the two feedback signals for compensating for the polarization state tracking error fed back to the signal adjuster The polarization tracking factor is updated to include:

According to the signal fed back by the loop filter, the tracking coefficients of each polarization state are respectively obtained, and the changing direction of the tracking coefficients of each polarization state is calculated, and according to the changing direction of the tracking coefficients of each polarization state, according to the set first step length corresponding The polarization tracking coefficient is updated; wherein the derivative obtained by the derivative is a regular change direction, and the negative direction is a decrease; and, according to the signal fed back by the loop filter, the signal is compensated according to the set light dispersion compensation signal. The value range and the set second step are used to scan the value of the light dispersion compensation signal to determine whether the signal fed back by the loop filter is within the set time. a fixed value, if it is a fixed value, the scanning of the optical dispersion compensation signal is stopped, and the optical dispersion compensation signal when the feedback signal of the loop filter is a fixed value within the set time is used as feedback signal to the signal clock. The optical dispersion compensation signal of the compensator (if it is not a fixed value, the scan is restarted).

Wherein, the first step of the setting may be flexibly set according to actual conditions; and, since the value of the first step of the setting will directly affect the speed of the polarization state tracking, it is generally possible to comprehensively consider Depending on the rotation of the polarization state of the entire system. In addition, the second step of the setting may be flexibly set according to actual conditions; and, generally, the clock performance monitoring device obtains the current C value according to the signal fed back by the loop filter. Depending on the derivative (which is similar to the previous description, the derivative obtained by derivation is positive, the direction of change is increasing, and the direction of change is negative, the direction of change is decreasing), and no further description is made here.

Further, it should be noted that, as described above for the clock performance monitoring device, the clock performance monitoring device can have two functions: one is a parameter memory function, and is used to store A, A', and C values. The other is the parameter scanning and judging function, that is, when the three parameters A, A', and C are changed, it is judged whether the signal fed back by the loop filter is a fixed value within the set time, and if so, stops. The C value is scanned, and if it is not a fixed value, the scanning is started again; in addition, A and A' can be kept updated in real time to track the polarization state.

In addition, it should be noted that, in order to enable the clock performance monitoring device to be implemented well, the correspondence between the input signal and A, A', and C may be established in advance, and the input signal pair A, A', C can be continuously derived. In this way, when receiving the signal feedback from the loop filter, A, A', and C calculate the corresponding derivative value with the value of the input signal, and determine the direction of change or the amount of change of the values of A, A', and C according to the sign of the derivative, and details are not described herein again.

Step 703: The optical dispersion compensation signal when the signal fed back by the loop filter is determined to be a fixed value within a set time is fed back to the signal clock compensator, so that the signal clock compensator compensates for the light dispersion according to the feedback of the clock performance monitoring device. a signal, performing phase compensation on the received two signals from the dispersion estimation and compensation module and outputting the compensated two signals to the signal adjuster; and determining that the signal fed back by the loop filter is one in the set time The two polarization state tracking coefficients at a fixed value are fed back to the signal adjuster, so that the signal adjuster performs polarization state tracking on the received signal from the signal clock compensator according to the two polarization state tracking coefficients fed back by the clock performance monitoring device. .

That is, in the solution of the embodiment of the present invention, the value of the optical dispersion compensation signal C for compensating the residual light dispersion and the tracking error for compensating the polarization state may be updated according to an output signal of the loop filter. The values of the polarization tracking coefficients A, A' are such that when the above three parameters, namely the optical dispersion compensation signal C and the values of the two polarization state tracking coefficients A, A', change, the loop filter feedback signal is The set time is a fixed value, so that not only the influence of the light dispersion can be monitored by the change of the C value, but also the polarization state can be tracked by the change of the A and A' values. Moreover, since the phase portion compensated by the C value can also compensate for the phase change caused by the frequency domain offset of the laser, the effect of the laser frequency offset on the phase is also handled while the optical dispersion compensation is processed, thereby achieving It can simultaneously monitor the effects of PMD dispersion, light dispersion, and the inconsistent center frequency of the transceiver laser on the performance of the clock recovery module, and solve the problem of poor monitoring performance of the existing clock performance monitoring mode, and improve the comprehensiveness and accuracy of the monitoring. Sex, which in turn improves the performance of the system.

Embodiment 3:

Based on the same inventive concept as the first embodiment and the second embodiment of the present invention, the third embodiment of the present invention provides a clock performance monitoring device. For the specific implementation of the clock performance monitoring device, refer to the foregoing method embodiment 2 or the system embodiment. The relevant descriptions in the first part are not repeated here. Specifically, as shown in FIG. 8, the clock performance monitoring apparatus may mainly include:

The receiving module 81 is configured to receive a signal fed back by the loop filter;

The processing module 82 is configured to use the signal fed back by the loop filter, the opposite signal clock compensator The feedback optical dispersion compensation signal for compensating for residual light dispersion and the two polarization state tracking coefficients for compensating for polarization state tracking error fed back to the signal adjuster are updated such that the two polarization state tracking coefficients and the optical dispersion compensation When the value of the signal changes, the signal fed back by the loop filter is a fixed value within the set time;

The sending module 83 is configured to feed back the optical dispersion compensation signal when the signal fed back by the loop filter is a fixed value to the signal clock compensator, so that the signal clock compensator feeds back according to the clock performance monitoring device. The light dispersion compensation signal performs phase compensation on the received two signals from the dispersion estimation and compensation module and outputs the compensated two signals to the signal adjuster; and, the signal feedback from the loop filter is determined at the set time The two polarization tracking coefficients are fed back to the signal adjuster at a fixed value, so that the signal adjuster performs the received signal from the signal clock compensator according to the two polarization state tracking coefficients fed back by the clock performance monitoring device. Polarization state tracking.

Optionally, the processing module 82 is specifically configured to: perform, according to the signal fed back by the loop filter, separately derive tracking coefficients of the polarization states, calculate a change direction of the tracking coefficients of each polarization state, and track the change of the tracking coefficients according to the polarization states. Direction, according to the set first step length, update the corresponding polarization state tracking coefficient; wherein, the derivative obtained by the derivative is positive, the change direction is increased, and the negative direction is the decrease direction; and, according to the loop filter feedback The signal is scanned according to the set value range of the set light dispersion compensation signal and the set second step length to determine whether the signal fed back by the loop filter is one in the set time. A fixed value, if it is a fixed value, stops scanning the optical dispersion compensation signal, and the light dispersion compensation signal when the loop filter feedback signal is a fixed value within the set time is used as feedback to the signal clock compensation The light dispersion compensation signal of the device.

Wherein, the value of the light dispersion compensation signal is [0, 1], wherein 0 means no movement is required, and 1 means moving one sample interval forward.

Further, based on the same inventive concept as the first embodiment and the second embodiment of the present invention, the third embodiment of the present invention further provides another clock performance monitoring device, and the other clock performance monitoring device is a corresponding clock performance monitoring entity. For the specific implementation of the device, refer to the related description in the foregoing method embodiment 2 or the system embodiment 1. The repeated description is not repeated. Specifically, as shown in FIG. 9, the time The clock performance monitoring device can mainly include components such as a receiver 91, a processor 92, and a transmitter 93, wherein:

The receiver 91 is configured to receive a signal fed back by the loop filter;

The processor 92 is configured to compensate for a residual optical dispersion based on a signal fed back by the loop filter, and a light dispersion compensation signal for compensating for residual light dispersion and a feedback to the signal adjuster for compensating for polarization state tracking. The two polarization state tracking coefficients of the error are updated, so that when the values of the two polarization state tracking coefficients and the light dispersion compensation signal change, the signal fed back by the loop filter is a fixed value within a set time;

The transmitter 93 can be configured to feed back the optical dispersion compensation signal when the signal fed back by the loop filter is a fixed value to the signal clock compensator, so that the signal clock compensator is based on the clock performance monitoring device. The feedback light dispersion compensation signal phase-compensates the received two signals from the dispersion estimation and compensation module and outputs the compensated two signals to the signal adjuster; and, the signal that determines the loop filter feedback is set Two polarization state tracking coefficients for a fixed value are fed back to the signal adjuster, so that the signal adjuster monitors the two polarization state tracking coefficients according to the clock performance monitoring device, and receives the received signal from the signal clock compensator. The signal is subjected to polarization state tracking.

Optionally, the processor 92 is specifically configured to perform, according to a signal fed back by the loop filter, respectively, a tracking coefficient of each polarization state, calculate a change direction of each polarization state tracking coefficient, and track a change of the tracking coefficient according to each polarization state. Direction, according to the set first step length, update the corresponding polarization state tracking coefficient; wherein, the derivative obtained by the derivative is positive, the change direction is increased, and the negative direction is the decrease direction; and, according to the loop filter feedback The signal is scanned according to the set value range of the set light dispersion compensation signal and the set second step length to determine whether the signal fed back by the loop filter is one in the set time. A fixed value, if it is a fixed value, stops scanning the optical dispersion compensation signal, and the light dispersion compensation signal when the loop filter feedback signal is a fixed value within the set time is used as feedback to the signal clock compensation The light dispersion compensation signal of the device.

In addition, the processor 92 may have corresponding data for a CPU (Central Processing Unit), an MCU (Microcontroller Unit), a DSP (digital signal processing), and the like. The device capable of processing, or a combination thereof, may be a corresponding signal input interface or the like, and the transmitter may be a corresponding signal output interface or the like, and details are not described herein again.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the right to attach All changes and modifications are intended to be included within the scope of the invention.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A clock performance monitoring system, comprising: a signal clock compensator, a signal adjuster, a phase detector, a loop filter, an interpolation controller, and a clock performance monitoring device, wherein:

The clock performance monitoring device is configured to feed back a light dispersion compensation signal for compensating residual light dispersion to the signal clock compensator, and feed back two polarization state tracking coefficients for compensating the polarization state tracking error to the signal adjuster; and receive The signal fed back by the loop filter updates the two polarization state tracking coefficients and the light dispersion compensation signal according to the signal fed back by the loop filter, so that the values of the two polarization state tracking coefficients and the light dispersion compensation signal occur. When changing, the signal fed back by the loop filter is a fixed value within the set time;

The signal clock compensator is configured to receive the received chromatic dispersion estimation and compensation module from the clock performance monitoring system according to the optical dispersion compensation signal fed back by the clock performance monitoring device and the phase compensation value fed back by the interpolation controller The two signals are phase compensated, and the compensated two signals are outputted to the signal adjuster and the depolarization module connected to the clock performance monitoring system;

The signal adjuster is configured to perform polarization state tracking on the received signal according to two polarization state tracking coefficients fed back by the clock performance monitoring device, to obtain a positive spectrum signal and a negative spectrum signal, and output the signal to the phase detector;

The phase detector is configured to detect a sampling clock deviation of the received signal, obtain a sampling clock error signal, and output an imaginary part of the sampling clock error signal to a loop filter and an analog to digital converter;

The loop filter is configured to filter the signal from the phase detector, and output the filtered signal to the interpolation controller, and output the filtered signal to the clock performance monitoring device. ;

The interpolation controller is configured to feed back a phase compensation value to the signal clock compensator, and update the phase compensation value fed back to the signal clock compensator according to the signal from the loop filter.
The system of claim 1 wherein:

The clock performance monitoring device is specifically configured to perform a bias according to a signal fed back by the loop filter The vibration state tracking coefficients are respectively derived, and the change direction of the tracking coefficients of each polarization state is calculated, and according to the change direction of the tracking coefficients of each polarization state, the corresponding polarization state tracking coefficients are updated according to the set first step length; The derived derivative is a regular change direction, and the negative direction is a decrease; and, according to the signal fed back by the loop filter, according to the set value of the set light dispersion compensation signal and the set second step Scan the value of the light dispersion compensation signal to determine whether the signal fed back by the loop filter is a fixed value within a set time. If it is a fixed value, stop scanning the optical dispersion compensation signal and loop The light dispersion compensation signal when the signal fed back by the filter is a fixed value within the set time is used as the light dispersion compensation signal that needs to be fed back to the signal clock compensator.
The system of claim 2 wherein:

The value of the light dispersion compensation signal is [0, 1], where 0 means no movement is required, and 1 means moving one sample interval forward.
The system of claim 1 wherein:

The signal clock compensator is specifically configured to perform Fourier transform on the path signal for each of the received two signals to obtain a corresponding frequency domain signal, and perform positive and negative frequencies on the frequency domain signal. The branching of the information obtains the positive spectrum sub-signal and the negative spectrum sub-signal corresponding to the path signal; and according to the optical dispersion compensation signal fed back by the clock performance monitoring device and the phase compensation value fed back by the interpolation controller, The corresponding positive spectrum sub-signal performs phase shift processing in the frequency domain, and performs phase shift processing on the frequency domain on the negative spectral sub-signal corresponding to the path signal according to the phase compensation value fed back by the interpolation controller And performing spectral combining of the phase shift processed positive spectrum sub-signal corresponding to the path signal and the phase shift processed negative spectrum sub-signal to obtain a compensated signal corresponding to the path signal.
The system of claim 1 wherein:

The signal adjuster is specifically configured to multiply a positive spectrum sub-signal and a negative spectrum sub-signal corresponding to the first path signal by a clock performance monitoring device for the first one of the received two signals Transmitting the first tracking coefficient of the two polarization state tracking coefficients, obtaining the corrected first positive spectral sub-signal and the first negative spectral sub-signal; and for the second of the received two signals, The positive signal sub-signal corresponding to the second signal and the negative spectral sub-signal, corresponding multiplication Obtaining the second tracking coefficient of the two polarization state tracking coefficients fed back by the clock performance monitoring device to obtain the corrected second positive spectral sub-signal and the second negative spectral sub-signal; and the first positive spectral sub-signal and the second positive The spectral sub-signals are added correspondingly to obtain a positive spectral signal, and the first negative spectral sub-signal and the second negative spectral sub-signal are correspondingly added to obtain one negative spectral signal.
The system of claim 1 wherein:

The loop filter is specifically configured to divide the received signal into the same two signals, one signal multiplied by the set proportional coefficient, the other signal multiplied by the set integral coefficient, and multiplied by the set The signal of the integral coefficient is added to the output of the delayer and split into two sub-signals. One sub-signal is added to the signal multiplied by the set proportional coefficient and output as the first output signal to the interpolation controller. The path signal is fed back to the clock performance monitoring device as a second output signal.
The system of claim 1 wherein:

The interpolation controller is specifically configured to limit the phase compensation value fed back to the signal clock compensator within a range of moving a sample interval according to a signal from the loop filter.
The system of claim 7 wherein:

The value of the phase compensation value is [0, 1], where 0 means no movement is required, and 1 means moving one sample interval forward.
A clock performance monitoring method, comprising:

The clock performance monitoring device receives the signal fed back by the loop filter;

And an optical dispersion compensation signal for compensating residual light dispersion fed back to the signal clock compensator by the clock performance monitoring device according to the signal fed back by the loop filter, and the clock performance monitoring device feeding back to the signal adjuster The two polarization state tracking coefficients for compensating the polarization state tracking error are updated, so that when the values of the two polarization state tracking coefficients and the light dispersion compensation signal change, the signal fed back by the loop filter is fixed within the set time. value;

And determining a light dispersion compensation signal when the signal fed back by the loop filter is a fixed value within a set time is fed back to the signal clock compensator, so that the signal clock compensator compensates the light dispersion compensation signal according to the clock performance monitoring device, Receiving two signals from the dispersion estimation and compensation module for phase compensation and outputting the compensated two signals to the signal adjuster; and, determining loop filtering The two feedback state tracking coefficients of the feedback signal are fed back to the signal adjuster when the set value is a fixed value, so that the signal adjuster receives the two polarization state tracking coefficients according to the clock performance monitoring device, and receives the The signal from the signal clock compensator performs polarization state tracking.
The method according to claim 9, wherein the light dispersion compensation signal for compensating for residual light dispersion fed back to the signal clock compensator by the clock performance monitoring device according to the signal fed back by the loop filter, and the method The clock performance monitoring device updates the two polarization state tracking coefficients fed back to the signal adjuster for compensating for the polarization state tracking error, including:

According to the signal fed back by the loop filter, the tracking coefficients of each polarization state are respectively obtained, and the changing direction of the tracking coefficients of each polarization state is calculated, and according to the changing direction of the tracking coefficients of each polarization state, according to the set first step length corresponding The polarization tracking coefficient is updated; wherein the derivative obtained by the derivative is a regular change direction, and the negative direction is a decrease; and, according to the signal fed back by the loop filter, the signal is compensated according to the set light dispersion compensation signal. The value range and the set second step scan the value of the light dispersion compensation signal to determine whether the signal fed back by the loop filter is a fixed value within the set time. If it is a fixed value, stop the pair. The light dispersion compensation signal is scanned, and the light dispersion compensation signal when the signal fed back by the loop filter is a fixed value within a set time is used as a light dispersion compensation signal that needs to be fed back to the signal clock compensator.
The method according to claim 10, wherein said light dispersion compensation signal has a value range of [0, 1], wherein 0 means no movement is required, and 1 means moving forward by one sample interval.
A clock performance monitoring device, comprising:

a receiving module, configured to receive a signal fed back by the loop filter;

a processing module, configured to, according to a signal fed back by the loop filter, a light dispersion compensation signal for compensating residual light dispersion fed back to the signal clock compensator, and two signals for compensating for polarization state tracking error fed back to the signal adjuster The polarization tracking coefficients are updated such that when the two polarization state tracking coefficients and the value of the light dispersion compensation signal change, the signal fed back by the loop filter is a fixed value within a set time;

a sending module, configured to feed back a light dispersion compensation signal when the signal fed back by the loop filter is a fixed value within a set time to the signal clock compensator, so that the signal clock compensator is timed The light dispersion compensation signal fed back by the clock performance monitoring device performs phase compensation on the received two signals from the dispersion estimation and compensation module and outputs the compensated two signals to the signal adjuster; and, the loop filter feedback is determined The two polarization state tracking coefficients of the signal when the signal is a fixed value within a set time are fed back to the signal adjuster, so that the signal adjuster monitors the two polarization state tracking coefficients according to the clock performance monitoring device, and receives the received signal from the signal. The signal of the clock compensator performs polarization state tracking.
The device of claim 12 wherein:

The processing module is specifically configured to, according to a signal fed back by the loop filter, separately obtain a tracking coefficient of each polarization state, calculate a change direction of each polarization state tracking coefficient, and according to a change direction of each polarization state tracking coefficient, according to the setting The first step length is updated to update the corresponding polarization state tracking coefficient; wherein, the derivative obtained by the derivative is positive, the direction of change is increased, and the direction of change is negative, and the direction of change is reduced; and, according to the signal fed back by the loop filter, Setting the range of the light dispersion compensation signal and the set second step to scan the value of the light dispersion compensation signal, and determining whether the signal fed back by the loop filter is a fixed value within the set time, if When it is a fixed value, the scanning of the optical dispersion compensation signal is stopped, and the optical dispersion compensation signal when the signal fed back by the loop filter is a fixed value within the set time is used as the light dispersion required to be fed back to the signal clock compensator. Compensation signal.
The apparatus according to claim 13, wherein said light dispersion compensation signal has a value range of [0, 1], wherein 0 means no movement is required, and 1 means moving forward by one sample interval.