WO2015106494A1 - 一种色度色散测量方法、装置及数字相干接收机 - Google Patents

一种色度色散测量方法、装置及数字相干接收机 Download PDF

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Publication number
WO2015106494A1
WO2015106494A1 PCT/CN2014/074567 CN2014074567W WO2015106494A1 WO 2015106494 A1 WO2015106494 A1 WO 2015106494A1 CN 2014074567 W CN2014074567 W CN 2014074567W WO 2015106494 A1 WO2015106494 A1 WO 2015106494A1
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value
domain data
frequency domain
chromatic dispersion
unit
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PCT/CN2014/074567
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English (en)
French (fr)
Inventor
姚扬中
李运鹏
蔡轶
周伟勤
贾振生
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深圳市中兴微电子技术有限公司
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Priority to KR1020167014063A priority Critical patent/KR20160103979A/ko
Priority to US15/112,044 priority patent/US9929801B2/en
Priority to JP2016554774A priority patent/JP6310091B2/ja
Priority to EP14878650.2A priority patent/EP3096469B1/en
Publication of WO2015106494A1 publication Critical patent/WO2015106494A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795Performance monitoring; Measurement of transmission parameters
    • H04B10/07951Monitoring or measuring chromatic dispersion or PMD
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60Receivers
    • H04B10/61Coherent receivers

Definitions

  • the present invention relates to optical communication technologies, and in particular, to a chromatic dispersion measurement method and apparatus, and a digital coherent receiver. Background technique
  • digital coherent reception technology Compared with non-coherent technology, digital coherent reception technology has the following advantages: Optical signal-to-noise ratio (OSNR) gain of about 3dB; easy use of electrical equalization technology to cope with channel changes, reduce cost, etc.; Modulation technology and polarization multiplexing technology to improve transmission capacity; Among them, ⁇ power equalization technology can almost completely compensate the linear distortion of optical signals, such as: can compensate for chromatic dispersion (CD), polarization mode dispersion (PMD) and so on. Therefore, digital coherence technology is considered to be a key technology for high-speed optical communication systems.
  • OSNR Optical signal-to-noise ratio
  • PMD polarization mode dispersion
  • FIG. 1 is a block diagram of the signal processing of a typical digital coherent receiver.
  • the process of signal processing by the digital coherent receiver includes: dividing the optical signal into two mutually polarized optical signals by a polarization beam splitter (PBS) 101; and outputting the polarized light signal of the PBS 101 through the 90° optical hybrid.
  • the frequency converter 102 mixes with the local oscillator optical signal; the mixed optical signal is converted into a baseband electrical signal by a balanced photodetector (PD) 103; the photoelectrically converted electrical signal passes through an analog to digital converter (ADC, Analog-to -Digital Converter ) 104 is converted to a digital signal, after which the digital signal converted by the ADC can be processed by a general digital signal processing technique.
  • ADC Analog-to -Digital Converter
  • the general digital signal processing technology is used to process the digital signal converted by the ADC, which in turn includes: the skew compensation module 105 performs skew compensation processing, and removes DC/IQ unbalance compensation.
  • the compensation module 106 performs the DC/IQ imbalance compensation process
  • the dispersion chromaticity compensation module 107 performs the dispersion chromaticity compensation process
  • the clock recovery module 108 performs the clock recovery process
  • the adaptive equalization module 109 performs the adaptive equalization process
  • the carrier synchronization module 110 The carrier synchronization processing is performed
  • the decision detection module 111 performs a decision detection process.
  • the compensation of the chromatic dispersion and the polarization mode dispersion is generally completed in two parts.
  • the chromatic dispersion is compensated, and the equalizer here cannot usually use the standard adaptive algorithm for coefficient update.
  • the chromatic dispersion 40,000 ps/nm is compensated, the number of filter taps should be several hundred or even thousands, and the fast Fourier transform technique is usually used for fast frequency convolution in the frequency domain; and the chromatic dispersion estimation module is the dispersion chromaticity compensation module 107.
  • the compensation of residual chromatic dispersion and polarization mode dispersion is implemented by the adaptive equalization module 109, specifically, by a Finite Impulse Response (FIR) butterfly equalizer, and the FIR butterfly filter is used.
  • the adaptive algorithm updates the coefficients to track the polarization mode dispersion that compensates dynamically over time.
  • the function of the FIR butterfly equalizer is to implement polarization demultiplexing.
  • the FIR butterfly equalizer has the functions of equalization, matched filtering and sample position adjustment. When the range of the sample change is too large, or if the frequency deviation of the sample is such that the phase change range of the sample exceeds the adjustment range of the FIR butterfly adaptive equalizer, the FIR butterfly equalizer may not work properly. Therefore, a clock recovery module 108 needs to be placed before the FIR butterfly equalizer.
  • the clock recovery module 108 estimates the sampling time error of the input symbol, and performs interpolation adjustment on the sampling time of the symbol, or adjusts the sampling frequency of the ADC through a voltage-controlled oscillator (VCO, Voltage-Controlled Oscillator) to ensure stability.
  • VCO Voltage-Controlled Oscillator
  • the symbol is like the phase.
  • the phase detector of the clock recovery module 108 is required to tolerate a certain signal distortion, and the conventional phase detector generally can only tolerate a small amount. Chromatic dispersion value.
  • the dispersion chromaticity compensation module 107 is required to accurately perform chromatic dispersion compensation; and the dispersion chromaticity compensation module 107 is required to perform accurately Chromatic dispersion compensation requires the chromatic dispersion estimation module to provide accurate chromatic dispersion values to be compensated. In other words, it is necessary to measure the chromatic dispersion values to be compensated with high precision.
  • embodiments of the present invention provide a chromaticity dispersion measuring method, a device, and a digital coherent receiver.
  • Embodiments of the present invention provide a chromatic dispersion measurement method, including:
  • the obtained chromatic dispersion sequence of each frequency domain data is subjected to a correlation operation of a predetermined interval, wherein: the complex conjugate of the prime is multiplied, and the obtained products are summed to obtain correlations. value.
  • the determining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval includes:
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the method further includes: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the method before the determining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval, the method further includes:
  • the chromatic dispersion value is determined according to the sixth value, the frequency value of the unit frequency point interval of the frequency domain data, and the preset interval.
  • the determining the chromatic dispersion value according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval includes:
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the values of the two or more preset intervals are different; correspondingly, two or more of the first values and two or more of the sixth are obtained. a value and two or more of the second values;
  • the method further includes: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the method before performing the chromaticity dispersion sequence processing on the acquired frequency domain data, the method further includes:
  • the generated plurality of frequency domain data having different polarization directions are subjected to chromatic dispersion sequence processing.
  • the method before the performing polarization rotation on the frequency domain data, the method further includes:
  • An embodiment of the present invention further provides a chromaticity dispersion measuring apparatus, including: a chromatic dispersion sequence processing unit, a correlation operation processing unit, and a determining unit; wherein
  • the chromatic dispersion sequence processing unit is configured to perform chromaticity dispersion sequence processing on the acquired frequency domain data to obtain a chromatic dispersion sequence of the frequency domain data; and send the obtained chromaticity dispersion sequences to the correlation operation Processing unit
  • the correlation operation processing unit is configured to: after receiving the obtained chromaticity dispersion sequences sent by the chromatic dispersion sequence processing unit, performing correlation operation processing on the obtained chromaticity chromatic dispersion sequences at predetermined intervals, and obtaining the obtained Summing each correlation value, obtaining a first value, and transmitting the first value to the determining unit;
  • the determining unit is configured to receive the frequency value of the unit frequency interval of the frequency domain data and the preset interval sent by the correlation operation processing unit, and determine the chromatic dispersion value.
  • the device further includes: a filtering unit, configured to perform filtering processing on the first value, to obtain a sixth value, and send the sixth value to the determining unit; correspondingly, the determining unit, And configuring, according to the sixth value, the frequency value of the unit frequency point interval of the frequency domain data, and the preset interval, determining a chromatic dispersion value.
  • a filtering unit configured to perform filtering processing on the first value, to obtain a sixth value, and send the sixth value to the determining unit; correspondingly, the determining unit, And configuring, according to the sixth value, the frequency value of the unit frequency point interval of the frequency domain data, and the preset interval, determining a chromatic dispersion value.
  • the correlation operation The processing unit includes two or more related operation processing sub-units, and each of the correlation operation processing sub-units is configured to perform correlation operation processing of one of the two or more preset intervals.
  • the filtering unit includes two or more filtering subunits
  • Each correlation operation processing sub-unit sends the data subjected to the correlation operation processing to the corresponding filter sub-unit; each filter sub-unit performs filtering processing on the received data.
  • the device further includes: a polarization rotation unit configured to perform polarization rotation on the acquired frequency domain data to generate a plurality of frequency domain data having different polarization directions; and generate a plurality of frequency bands with different polarization directions
  • the domain data is sent to the chromatic dispersion sequence processing unit; correspondingly, the chromatic dispersion sequence processing unit is configured to: after receiving the plurality of frequency domain data having different polarization directions sent by the polarization rotation unit, generate A plurality of frequency domain data having different polarization directions are processed by chromatic dispersion sequence.
  • the device further includes:
  • a frequency domain data acquiring unit configured to acquire frequency domain data, and send the acquired frequency domain data to the polarization rotation unit;
  • the polarization rotation unit is configured to receive the frequency domain data sent by the frequency domain data acquisition unit, and perform polarization rotation on the acquired frequency domain data to generate a plurality of frequency domain data having different polarization directions.
  • an embodiment of the present invention further provides a digital coherent receiver, the digital coherent receiver comprising the chromatic dispersion measuring device described above.
  • An embodiment of the present invention further provides a computer storage medium, the computer storage medium comprising a set of instructions, when executed, causing at least one processor to perform the chromatic dispersion measurement method described above.
  • the chromaticity dispersion measuring method, device and digital coherent receiver provided by the embodiment of the present invention perform chromaticity dispersion sequence processing on the obtained frequency domain data to obtain a chromatic dispersion sequence of the frequency domain data;
  • the sequence is separately processed at a preset interval, and will be obtained.
  • the chromatic dispersion value is determined and the processing efficiency is high.
  • Figure 1 is a block diagram of signal processing of a typical digital coherent receiver
  • FIG. 2 is a schematic flow chart of a chromatic dispersion measurement method according to an embodiment of the present invention
  • FIG. 3 is a schematic flow chart of a method for measuring chromatic dispersion according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural view of a device for measuring a chromatic dispersion according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a device for measuring chromatic dispersion according to an embodiment of the present invention.
  • FIG. 6 is a block diagram of signal processing of a digital coherent receiver according to a fifth embodiment of the present invention.
  • FIG. 7 is a block diagram of signal processing of a five-chrominance dispersion measuring device according to an embodiment of the present invention. detailed description
  • the chromaticity dispersion sequence processing is performed on the acquired frequency domain data to obtain a chromatic dispersion sequence of the frequency domain data; and the correlation operation of each chromatic dispersion sequence is performed at a preset interval Processing, and summing the obtained correlation values to obtain a first value; determining a chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval.
  • the chromatic dispersion measurement method of this embodiment includes the following steps: Step 201: Perform chrominance dispersion sequence processing on the acquired frequency domain data to obtain a chromatic dispersion sequence of the frequency domain data.
  • the frequency domain data includes: first sub-frequency domain data and second sub-frequency domain data; wherein, the first sub-frequency domain data refers to: frequency domain data according to polarization of the first light; the second sub-frequency The domain data refers to: frequency domain data according to the polarization of the second light.
  • the obtained chromatic dispersion sequence is two chromatic dispersion sequences corresponding to the first sub-frequency domain data and the second sub-frequency domain data, respectively.
  • Step 202 Perform correlation operation processing on each of the obtained chromaticity chromatic dispersion sequences at predetermined intervals, and sum the obtained correlation values to obtain a first value;
  • the obtained chromatic dispersion sequence of each frequency domain data is subjected to a correlation operation of a predetermined interval, specifically: multiplication of the complex conjugate of the prime, and the obtained products are summed to obtain respective correlation values. .
  • the preset interval is a positive integer, such as: 1, 2, 3, and so on.
  • the preset interval is set according to requirements; the number of the preset intervals may be more than one. Specifically, when the number of the preset intervals is one, the preset interval may be set according to related parameters and indicators of the applied network environment; when the number of the preset intervals is two or more The preset intervals may be set according to relevant parameters and indicators of the applied network environment, and related theory of chromatic dispersion.
  • Step 203 Determine a chromatic dispersion value according to the first value, a frequency value of a unit frequency interval of the frequency domain data, and the preset interval.
  • the determining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval specifically includes: Calculating the argument of the first value to obtain a second value;
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the specific processing procedure for obtaining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval is expressed by a formula, and the following are:
  • CD represents the chromatic dispersion value in nanometers per nanosecond (nm/ns); ⁇ indicates
  • the preset interval when only the preset interval with a small value is used, for example: the preset interval is 1 or 2, etc., at this time, the determined accuracy is considered to be low, and the determined chromatic dispersion value is determined.
  • the range is large, which is not conducive to the subsequent clock recovery processing.
  • the preset interval is 16 or 32, etc. High, but the range of the determined chromatic dispersion value is small, which is also disadvantageous for subsequent clock recovery processing; therefore, the number of the preset intervals can be more than two, and the larger value and the smaller value are smaller The combination of values is handled.
  • the values of the two or more preset intervals are different; correspondingly, the number of the first values obtained is two or more, and the second value
  • the first preset interval and the second preset interval are two preset intervals, and the first preset interval and the second preset interval are different.
  • the obtained chromatic dispersion sequence is respectively subjected to a correlation operation of the first preset interval, and the obtained correlation values are summed to obtain a first value, and the amplitude of the first value is calculated to obtain a second a value; performing a correlation operation on the obtained second chromatic dispersion sequence for each second chromatic dispersion sequence, and summing the obtained correlation values to obtain another first value, calculating the other first value, and obtaining another The second value, that is, the corresponding two first values are obtained, and correspondingly, the corresponding two second values are obtained.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the two or more of the preset intervals and the corresponding two or more second values are unwrapped, and the specific implementation of obtaining the third value may be various, which is a common technology for those skilled in the art. means.
  • the method may further include: before determining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval, the method further includes:
  • the sixth value is a complex number.
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the specific processing procedure for obtaining the chromatic dispersion value according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval is expressed by a formula, and the following is:
  • CD represents the chromatic dispersion value in nanoseconds/nanometer (ns/nm); ⁇ indicates
  • the number of the preset intervals is two or more, the values of the two or more preset intervals are different, and according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the Predetermined interval, before the chromatic dispersion value is determined
  • the first value is filtered
  • the number of the first value obtained is two or more
  • the number of the sixth value is also two More than one
  • the number of the second values is also two or more; for example, it is assumed that there are two preset intervals, a first preset interval and a second preset interval, the first preset interval and the second If the values of the preset intervals are different, the correlation processing of the first preset intervals is performed on each obtained chromatic dispersion sequence, and the obtained correlation values are summed to obtain a first value, and the first obtained is obtained.
  • the value is filtered to obtain a sixth value, and the angle of the sixth value is calculated to obtain a second value; the obtained chromatic dispersion sequence is respectively subjected to a correlation operation of the second preset interval, and each obtained result is obtained.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the two or more of the preset intervals and the corresponding two or more second values are unwrapped, and the specific implementation of obtaining the third value may be various, which is a common technology for those skilled in the art. means.
  • the chromatic dispersion measurement method provided by the embodiment of the present invention is proposed based on the correlation feature of the chromatic dispersion channel, and can accurately determine the chromatic dispersion value, and the processing efficiency is high.
  • the conventional chromatic dispersion measurement method has a method of performing feedback control of the chromaticity dispersion compensator by using transmission quality information (such as error rate, Q factor, etc.).
  • the basic idea of the method is to change the dispersion compensation of the chromatic dispersion compensation filter at a chromatic dispersion interval of a certain step until the digital coherent receiver system converges.
  • the search process is slow when the digital coherent receiver system is started, the accuracy of the determined chromatic dispersion value is low.
  • the optical fiber link is subject to changes in ambient temperature, and the chromatic dispersion value of the link also changes slowly. Therefore, it is difficult to judge the slow change of the chromatic dispersion value in the operation of the digital coherent receiver system.
  • the chromatic dispersion measurement method provided by the embodiment uses a direct calculation method without searching, so that when the digital coherent receiver system is started, the chromatic dispersion value of the link can be quickly estimated; meanwhile, the digital coherent receiver system operates. In the middle, it is also possible to continue to estimate the link chromatic dispersion value, track its change, and provide accurate compensation dispersion for the chromatic dispersion compensation module, thereby reducing the complexity of the clock recovery module processing.
  • the number of the predetermined intervals is two or more, so that the range of the chromatic dispersion value can be more accurately determined.
  • the first value is filtered to obtain a sixth value; correspondingly, the chromaticity is determined according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval.
  • the dispersion value in this way, can more accurately determine the range of the chromatic dispersion value.
  • the chromatic dispersion measurement method of this embodiment includes the following steps:
  • Step 200 Perform polarization rotation on the acquired frequency domain data to generate a plurality of frequency domain data having different polarization directions.
  • the specific implementation of this step can use the prior art.
  • the specific number of generated frequency domain data having different polarization directions can be determined as needed.
  • the method may further include:
  • the received time domain data may be converted into frequency domain data; or, the frequency domain data may be directly obtained.
  • converting the received time domain data into frequency domain data is a common technical means for those skilled in the art, and will not be described again.
  • Step 201 Perform chrominance dispersion sequence processing on the acquired frequency domain data to obtain a chromatic dispersion sequence of the frequency domain data.
  • performing chromatic dispersion sequence processing on the acquired frequency domain data means: performing chromatic dispersion sequence processing on the generated plurality of frequency domain data having different polarization directions.
  • the performing chromatic dispersion sequence processing is specifically:
  • the frequency domain data includes: first sub-frequency domain data and second sub-frequency domain data; wherein, the first sub-frequency domain data refers to: frequency domain data according to polarization of the first light; the second sub-frequency The domain data refers to: frequency domain data according to the polarization of the second light.
  • the obtained chromatic dispersion sequence is two chromatic dispersion sequences corresponding to the first sub-frequency domain data and the second sub-frequency domain data, respectively.
  • Step 202 Perform correlation operation processing on each of the obtained chromaticity chromatic dispersion sequences at predetermined intervals, and sum the obtained correlation values to obtain a first value;
  • the obtained chromatic dispersion sequence of each frequency domain data is subjected to a correlation operation of a predetermined interval, specifically: multiplication of the complex conjugate of the prime, and the obtained products are summed to obtain respective correlation values. .
  • the preset interval is a positive integer, such as: 1, 2, 3, and so on.
  • the preset interval is set as needed; the number of the preset intervals may be more than one. Specifically, when the number of the preset intervals is one, the preset interval may be set according to related parameters and indicators of the applied network environment; when the number of the preset intervals is two or more The preset intervals may be set according to relevant parameters and indicators of the applied network environment, and related theory of chromatic dispersion.
  • Step 203 Determine a chromatic dispersion value according to the first value, the frequency value of the unit frequency point interval of the frequency domain data, and the preset interval.
  • the determining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval specifically includes:
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the unit is Gbaud; here, the optical domain corresponding to the frequency domain data
  • the wavelength of the number and the symbol rate of the system are set values, and the sampling rate ( ) is divided by the number of FFT points ( ⁇ ) to obtain the frequency value of the frequency-frequency interval of the frequency domain data.
  • the preset interval when only the preset interval with a small value is used, for example: the preset interval is 1 or 2, etc., at this time, the determined accuracy is considered to be low, and the determined chromatic dispersion value is determined.
  • the range is large, which is not conducive to the subsequent clock recovery processing.
  • the preset interval is 16 or 32, etc. High, but the range of the determined chromatic dispersion value is small, which is also disadvantageous for subsequent clock recovery processing; therefore, the number of the preset intervals can be more than two, and the larger value and the smaller value are smaller The combination of values is handled.
  • the values of the two or more preset intervals are different; correspondingly, the number of the first values obtained is two or more, and the second value
  • the first preset interval and the second preset interval are two preset intervals, and the first preset interval and the second preset interval are different.
  • the obtained chromatic dispersion sequence is respectively subjected to a correlation operation of the first preset interval, and the obtained correlation values are summed to obtain a first value, and the amplitude of the first value is calculated to obtain a second a value; performing a correlation operation on the obtained second chromatic dispersion sequence for each second chromatic dispersion sequence, and summing the obtained correlation values to obtain another first value, calculating the other first value, and obtaining another The second value, that is, the corresponding two first values are obtained, and correspondingly, the corresponding two second values are obtained.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the two or more of the preset intervals and the corresponding two or more second values are unwrapped, and the specific implementation of obtaining the third value may be various, which is a common technology for those skilled in the art. means.
  • the following is a practical application example in which two or more of the preset intervals and corresponding two or more second values are unwrapped to obtain a third value.
  • the method may further include: before determining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval, the method further includes:
  • the sixth value is a complex number.
  • the specific processing procedure for obtaining the chromatic dispersion value according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval is expressed by a formula, and the following is:
  • CD represents the chromatic dispersion value in nanoseconds/nanometer (ns/nm); the sixth value of the argument, the unit of which is turn; ⁇ represents the preset interval, no unit; c represents the speed of light, The unit is m/s (m/s); A represents the wavelength of the optical signal corresponding to the frequency domain data, and its unit is nanometer (nm); ⁇ represents the frequency value of the frequency-frequency interval of the frequency domain data, The unit is GHz; represents the system symbol rate, and its unit is Gbaud; here, the wavelength of the optical signal corresponding to the frequency domain data and the system symbol rate are set values, and the sampling rate ( ) is divided by the FFT point ( ⁇ ) Obtaining a frequency value of the frequency domain data unit frequency interval.
  • the number of the preset intervals is two or more, the values of the two or more preset intervals are different, and according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the Predetermined interval, before the chromatic dispersion value is determined
  • the first value is filtered
  • the number of the first value obtained is two or more
  • the number of the sixth value is also two More than one
  • the number of the second values is also two or more; for example, it is assumed that there are two preset intervals, a first preset interval and a second preset interval, the first preset interval and the second If the values of the preset intervals are different, the correlation processing of the first preset intervals is performed on each obtained chromatic dispersion sequence, and the obtained correlation values are summed to obtain a first value, and the first obtained is obtained.
  • the value is filtered to obtain a sixth value, and the angle of the sixth value is calculated to obtain a second value; the obtained chromatic dispersion sequence is respectively subjected to a correlation operation of the second preset interval, and each obtained result is obtained.
  • Summing the relevant values getting another a first value, filtering the another first value to obtain another sixth value, calculating an argument of the another sixth value, and obtaining another second value, namely: To the corresponding two first values, correspondingly, the corresponding two sixth values are obtained, and the corresponding two second values are obtained.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the method may further include: unwrapping two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the two or more of the preset intervals and the corresponding two or more second values are unwrapped, and the specific implementation of obtaining the third value may be various, which is a common technology for those skilled in the art. means.
  • the chromatic dispersion measurement method provided by the embodiment of the present invention is proposed based on the correlation feature of the chromatic dispersion channel, and can accurately determine the chromatic dispersion value, and the processing efficiency is high.
  • the conventional chromatic dispersion measurement method has a method of performing feedback control of the chromaticity dispersion compensator by using transmission quality information (such as error rate, Q factor, etc.).
  • the basic idea of the method is to change the dispersion compensation of the chromatic dispersion compensation filter at a chromatic dispersion interval of a certain step until the digital coherent receiver system converges.
  • the search process is slow when the digital coherent receiver system is started, the accuracy of the determined chromatic dispersion value is low.
  • the optical fiber link is subject to changes in ambient temperature, and the chromatic dispersion value of the link also changes slowly. Therefore, it is difficult to judge the slow change of the chromatic dispersion value in the operation of the digital coherent receiver system.
  • the chromatic dispersion measurement method provided by the embodiment uses a direct calculation method without searching, so that when the digital coherent receiver system is started, the chromatic dispersion value of the link can be quickly estimated; meanwhile, the digital coherent receiver system operates. In the middle, it is also possible to continue to estimate the link chromatic dispersion value, track its change, and provide accurate compensation dispersion for the chromatic dispersion compensation module, thereby reducing the complexity of the clock recovery module processing.
  • the number of the preset intervals is two or more, so that Accurately determine the range of chromatic dispersion values.
  • the first value is filtered to obtain a sixth value; correspondingly, the chromaticity is determined according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval.
  • the dispersion value in this way, can more accurately determine the range of the chromatic dispersion value.
  • the present embodiment provides a chromaticity dispersion measuring apparatus.
  • the apparatus includes: a chromatic dispersion sequence processing unit 41, a correlation operation processing unit 42, and a determining unit 43; ,
  • the chromatic dispersion sequence processing unit 41 is configured to perform chromatic dispersion sequence processing on the acquired frequency domain data to obtain a chromatic dispersion sequence of the frequency domain data; and send the obtained chromatic dispersion sequence to the correlation operation processing unit 42. ;
  • the correlation operation processing unit 42 is configured to receive the respective chromaticity chromatic dispersion sequences transmitted by the chromatic dispersion sequence processing unit 41, and perform correlation operation processing on the obtained chromaticity chromatic dispersion sequences at predetermined intervals, and obtain related correlations. The values are summed to obtain a first value, and the first value is sent to the determining unit 43;
  • the determining unit 43 is configured to receive the frequency value of the unit frequency interval of the frequency domain data and the preset interval sent by the correlation operation processing unit 42 to determine the chromatic dispersion value. among them,
  • the performing chromatic dispersion sequence processing is specifically:
  • the frequency domain data includes: first sub-frequency domain data and second sub-frequency domain data; wherein, the first sub-frequency domain data refers to: frequency domain data according to polarization of the first light; the second sub-frequency The domain data refers to: frequency domain data according to the polarization of the second light.
  • the obtained chromatic dispersion sequence is two chromatic dispersion sequences corresponding to the first sub-frequency domain data and the second sub-frequency domain data, respectively.
  • the obtained chromatic dispersion sequence of each frequency domain data is subjected to a correlation operation of a predetermined interval, specifically: multiplying the complex conjugates of the elements, and summing the obtained products to obtain respective correlation values.
  • the preset interval is a positive integer, such as: 1, 2, 3, and so on.
  • the preset interval is set according to requirements; the number of the preset intervals may be more than one. Specifically, when the number of the preset intervals is one, the preset interval may be set according to related parameters and indicators of the applied network environment; when the number of the preset intervals is two or more The preset intervals may be set according to relevant parameters and indicators of the applied network environment, and related theory of chromatic dispersion.
  • the determining unit 43 is specifically configured to:
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the specific processing procedure for obtaining the chromatic dispersion value according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval is expressed by a formula, and the following are: Where CD represents the chromatic dispersion value, the unit is nanoseconds/nanometer (ns/nm); ⁇ indicates the first
  • the wavelength of the signal, in units Nano (nm); ⁇ represents the frequency value of the frequency domain data unit frequency interval, the unit is GHz; nfft
  • the preset interval when only the preset interval with a small value is used, for example: the preset interval is 1 or 2, etc., at this time, the determined accuracy is considered to be low, and the determined chromatic dispersion value is determined.
  • the range is large, which is not conducive to the subsequent clock recovery processing.
  • the preset interval is 16 or 32, etc. High, but the range of the determined chromatic dispersion value is small, which is also disadvantageous for subsequent clock recovery processing; therefore, the number of the preset intervals can be more than two, and the larger value and the smaller value are smaller The combination of values is handled.
  • the correlation operation processing unit 42 includes two or more correlation operation processing sub-units; for example, it is assumed that there are two preset intervals of the first preset interval and the second preset interval.
  • the first preset interval is different from the second preset interval.
  • the correlation operation processing unit 42 includes a first correlation operation processing sub-unit and a second correlation operation processing sub-unit, and is obtained by the first correlation operation processing sub-unit pair.
  • Each chromatic dispersion sequence is subjected to correlation operation processing of the first preset interval, and the obtained correlation values are summed to obtain a first value, and then the determining unit 43 calculates the amplitude of the first value to obtain a first And performing, by the second correlation operation processing sub-unit, each chromaticity dispersion sequence obtained by performing correlation processing on a second preset interval, and summing the obtained correlation values to obtain another
  • the first value is further calculated by the determining unit 43 to obtain another second value, that is, the corresponding two first values are obtained, and correspondingly, the corresponding two second values are obtained.
  • the determining unit 43 is further configured to be more than two.
  • the predetermined interval and the corresponding two or more second values are subjected to unwinding processing to obtain a third value.
  • an integer multiple of phase ambiguity may occur, and therefore, an unwinding process is required.
  • the two or more of the preset intervals and the corresponding two or more second values are unwrapped, and the specific implementation of obtaining the third value may be various, which is a common technology for those skilled in the art. means.
  • the apparatus may further include: a filtering unit 44 configured to perform filtering processing on the first value to obtain a sixth value, and send the sixth value to the determining unit 43; the sixth value is a complex number.
  • the determining unit 43 is configured to determine a chromatic dispersion value according to a sixth value, a frequency value of a unit frequency interval of the frequency domain data, and the preset interval;
  • the determining unit 43 is specifically configured to: Calculating the argument of the sixth value to obtain a second value
  • the third value is multiplied by the fifth value to obtain a chromatic dispersion value.
  • the specific processing procedure for obtaining the chromatic dispersion value according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval is expressed by a formula, and the following is:
  • CD represents the chromatic dispersion value in nanoseconds/nanometer (ns/nm); ⁇ indicates
  • the number of the preset intervals is two or more, the values of the two or more preset intervals are different, and according to the first value, the frequency value of the unit frequency interval of the frequency domain data, and the Predetermined interval, before the chromatic dispersion value is determined, when the first value is filtered, the number of the first value obtained is two or more, and the number of the sixth value is also two
  • the number of the second values is also two or more, that is, the correlation operation processing unit 42 includes two or more correlation operation processing sub-units, and correspondingly, the filtering unit 44 includes two or more corresponding filtering sub-units; For example, suppose there are two preset intervals and a second preset interval, two preset intervals, first The preset interval is different from the value of the second preset interval.
  • the correlation operation processing unit 42 includes a first correlation operation processing sub-unit and a second correlation operation processing sub-unit, and the filtering unit 44 includes a first filter sub-unit and a second filter. a unit, wherein each chromatic dispersion sequence obtained by the first correlation operation processing sub-unit performs a correlation operation of the first preset interval, and sums the obtained correlation values to obtain a first value;
  • the filtering subunit performs filtering processing on the first value to obtain a sixth value;
  • the determining unit 43 calculates the argument of the sixth value to obtain a second value;
  • the second correlation operation processing subunit unit obtains Each chromatic dispersion sequence is subjected to a correlation operation of a second predetermined interval, and the obtained correlation values are summed to obtain another first value; then the other first value is filtered by the second filtering subunit Processing, another sixth value is obtained; and the determining unit 43 calculates the argument of the other sixth value to obtain another second value, namely: obtaining the corresponding The two first values, corresponding
  • the determining unit 43 is further configured to untwist two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the determining unit 43 is further configured to untwist two or more of the preset intervals and the corresponding two or more second values to obtain a third value.
  • the two or more of the preset intervals and the corresponding two or more second values are unwrapped, and the specific implementation of obtaining the third value may be various, which is a common technology for those skilled in the art. means.
  • the chromaticity dispersion measuring apparatus provided by the embodiment of the present invention is proposed based on the correlation feature of the chromatic dispersion channel, and can accurately determine the chromatic dispersion value, and the processing efficiency is high.
  • the number of the predetermined intervals is two or more, so that the range of the chromatic dispersion value can be more accurately determined.
  • chromatic dispersion value in this way, can more accurately determine the range of the chromatic dispersion value.
  • the apparatus may further include: a polarization rotation unit 45 configured to perform polarization rotation on the acquired frequency domain data to generate a plurality of frequency domain data having different polarization directions; and correspondingly, the generated chromatic dispersion sequence processing unit 41 is configured to receive the plurality of frequency domain data having different polarization directions sent by the polarization rotation unit 45, The generated plurality of frequency domain data having different polarization directions are subjected to chromatic dispersion sequence processing.
  • a polarization rotation unit 45 configured to perform polarization rotation on the acquired frequency domain data to generate a plurality of frequency domain data having different polarization directions
  • the generated chromatic dispersion sequence processing unit 41 is configured to receive the plurality of frequency domain data having different polarization directions sent by the polarization rotation unit 45, The generated plurality of frequency domain data having different polarization directions are subjected to chromatic dispersion sequence processing.
  • the device may further include: a frequency domain data acquiring unit 46, configured to acquire frequency domain data, and send the acquired frequency domain data to the polarization rotation unit 45;
  • the polarization rotation unit 45 is configured to receive the frequency domain data sent by the frequency domain data acquisition unit 46, and perform polarization rotation on the acquired frequency domain data to generate a plurality of frequency domain data having different polarization directions.
  • the frequency domain data acquiring unit 46 may convert the received time domain data into frequency domain data; or, the frequency domain data may be directly obtained from the corresponding location.
  • the conversion of the received time domain data into frequency domain data is a common technical means for those skilled in the art, and will not be described again.
  • the chromatic dispersion sequence processing unit, the correlation operation processing unit, the determining unit, and the frequency domain data acquiring unit may be implemented by a central processing unit (CPU, Central Processing Unit) in the chromatic dispersion measuring device. ), a digital signal processor (DSP) or a programmable logic array (FPGA), the filter unit can be implemented by a filter in the chromatic dispersion measuring device, specifically, can be a low pass Filter;
  • the polarization rotation unit can be implemented by a polarization rotation filter bank in a chromatic dispersion measuring device.
  • FIG. 6 is a block diagram of signal processing of a digital coherent receiver according to an embodiment of the present invention.
  • the chromaticity dispersion measuring apparatus provided in this embodiment is located in a dispersion chromaticity compensation module 607, and may be a dispersion chromaticity compensation module 607.
  • the FFT sub-module provides frequency domain data directly to the chromatic dispersion measuring device.
  • the apparatus includes: a frequency domain data acquiring unit 71, a yaw rotation filter bank 72, a chromatic dispersion sequence processing unit 73, and a first The correlation operation processing sub-unit 74, the second correlation operation processing sub-unit 75, the first filtering sub-unit 76, the second filtering sub-unit 77, and the determining unit 78; the corresponding signal processing procedure includes the following steps:
  • Step A The frequency domain data acquiring unit 71 directly obtains the frequency domain data from the FFT submodule of the chromatic dispersion compensation module, and transmits the acquired frequency domain data to the yaw rotation filter bank 72;
  • the obtained first frequency domain data of the frequency domain data and the second sub-frequency domain data wherein the first sub-frequency domain data refers to: frequency domain data according to polarization of the first light; the second sub-frequency The domain data refers to: frequency domain data according to the polarization of the second light.
  • Step B The deflection rotation filter bank 72 performs polarization rotation on the frequency domain data sent by the frequency domain data acquisition unit 71 to generate three frequency domain data having different polarization directions, and generates three frequency bands with different polarization directions.
  • the domain data is sent to the chroma dispersion sequence processing unit 73;
  • the generated three frequency domain data with different polarization directions can be expressed as:
  • Step C The chromatic dispersion sequence processing unit 73 pairs the generated three having different polarization directions
  • the frequency domain data is processed by the chromatic dispersion sequence, and the obtained three chromatic dispersion sequences are respectively sent to the first correlation operation processing sub-unit 74 and the second correlation operation processing sub-unit 75;
  • Step D The first correlation operation processing sub-unit 74 performs the correlation operation processing of the obtained three chromatic dispersion sequences on the first preset interval, and sums the obtained correlation values to obtain a first value, and obtains This first value is sent to the first filter subunit 76;
  • the correlation operation processing of performing the first preset interval is specifically:
  • the elements in the three chromatic dispersion sequences are multiplied by the complex conjugate of the other element at a first predetermined interval, and the obtained products are summed to obtain respective correlation values.
  • the first value can be expressed as: (C Intel[ AJ));
  • Step E The first filtering sub-unit 76 filters the obtained Fi i line to obtain a sixth value, and sends the obtained sixth value to the determining unit 78;
  • the first filter subunit 76 is a low pass filter.
  • This sixth value is expressed by a formula and can be expressed as:
  • Step F The first correlation operation processing sub-unit 75 performs the correlation operation processing of the obtained three chromatic dispersion sequences on the second preset interval, and sums the obtained correlation values to obtain another a value, and the other first value obtained is sent to the second filter subunit 77;
  • the correlation operation processing of performing the first preset interval is specifically:
  • the elements in the three chromatic dispersion sequences are multiplied by the complex conjugate of the other element at a first predetermined interval, and the obtained products are summed to obtain respective correlation values.
  • the other first value can be expressed as:
  • Step G The second filtering sub-unit 77 performs filtering processing on the obtained F 2 to obtain a sixth value, and sends the obtained another sixth value to the determining unit 78;
  • the second filter subunit 77 is a low pass filter.
  • Another sixth value is expressed by a formula, which can be expressed as:
  • Step H After determining that the unit receives two sixth values, respectively calculating the amplitudes of the two sixth values, and unwinding the two preset intervals and the two second values;
  • Step HI Calculate the angles of the two sixth values separately, then:
  • Step ⁇ 3 Determine the chromatic dispersion value.
  • —————— when the wavelength corresponding to the frequency domain data, the symbol rate of the FFT point system, and the sampling rate are determined, the value of ————— is a constant, therefore, —————— can be called the dispersion chromaticity ratio
  • Nffi nffi relationship coefficient in this embodiment, the value is 249567 ps/nm; where c is ⁇ 2 X ⁇ X f d
  • the value is 299792458m/s.
  • two predetermined intervals are used for correlation operation processing, and therefore, high dispersion estimation accuracy can be achieved.
  • the first value is filtered to obtain a sixth value; correspondingly, the chromaticity is determined according to the sixth value, the frequency value of the unit frequency interval of the frequency domain data, and the preset interval.
  • the dispersion value in this way, can more accurately determine the range of the chromatic dispersion value.
  • the embodiment of the present invention further provides a digital coherent receiver, including the basic structure of the chromatic dispersion measuring device shown in FIG. 4 or FIG. 5, and various deformations and equivalent replacements thereof. Make a statement.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can be applied to one or more of its A computer program product embodied on a computer usable storage medium (including but not limited to disk storage and optical storage, etc.) containing computer usable program code.
  • a computer usable storage medium including but not limited to disk storage and optical storage, etc.
  • 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.

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Abstract

一种色度色散测量方法、色度色散测量装置及数字相干接收机。其中,色度色散测量方法包括:对获取的频域数据进行色度色散序列处理,得到所述频域数据的色度色散序列(201);对得到的各色度色散序列分别进行预设间隔的相关运算处理,并将得到的各相关值求和,得到第一值(202);根据所述第一值、所述频域数据的单位频点间隔的频率值及所述预设间隔,确定色度色散值(203)。如此,能够精确地确定色度色散值,且处理效率高。

Description

一种色度色散测量方法、 装置及数字相干接收机 技术领域
本发明涉及光通信技术, 尤其涉及一种色度色散测量方法、 装置及数 字相干接收机。 背景技术
随着互联网流量的增加, 在干线系统的光通信系统中需要更大的容量。 同时, 当每波长比特率增加时, 由传输路径上的色度色散、 偏振模色散以 及各种非线性效应的波形失真而导致信息质量的退化会变得很严重。
和非相干技术相比, 数字相干接收技术有如下优点: 大约 3dB的光信 噪比(OSNR )增益; 可以方便地釆用电均衡技术来应对信道变化, 降低成 本等; 可以釆用更高效的调制技术以及偏振复用技术来提高传输容量; 其 中, 釆用电均衡技术能够近乎完全地补偿光信号的线性失真, 比如: 可以 补偿色度色散(CD)、 偏振模色散(PMD)等。 因此数字相干技术被认为是 高速光通信系统的关键技术。
图 1为典型的数字相干接收机的信号处理框图。 如图 1所示, 数字相 干接收机进行信号处理的过程包括: 光信号被偏振分光器(PBS) 101分成相 互正交的两个偏振光信号; PBS 101输出的偏振光信号通过 90°光混频器 102 与本振光信号进行混频; 混频后的光信号通过平衡光电检测器 (PD ) 103 转换为基带电信号; 光电转换后的电信号通过模数转换器 (ADC, Analog-to-Digital Converter ) 104转换为数字信号, 之后可以通用数字信号 处理技术对经 ADC转换后的数字信号进行处理。
其中,釆用通用数字信号处理技术对经 ADC转换后的数字信号进行处 理, 依次包括: 歪斜补偿模块 105进行歪斜补偿处理、 去直流 /IQ不平衡补 偿模块 106进行去直流 /IQ不平衡补偿处理、 色散色度补偿模块 107进行色 散色度补偿处理、 时钟恢复模块 108进行时钟恢复处理、 自适应均衡模块 109进行自适应均衡处理、 载波同步模块 110进行载波同步处理、 判决检测 模块 111进行判决检测处理。
其中, 由于色散色度的值一般较大, 因此色度色散和偏振模色散的补 偿一般分两部分完成, 首先, 补偿色度色散, 这里的均衡器通常不能使用 标准的自适应算法进行系数更新, 如补偿 40000ps/nm色度色散, 滤波器抽 头数要达到大几百甚至上千, 通常利用快速傅立叶变换技术进行频域快速 卷积; 并由色度色散估计模块为色散色度补偿模块 107提供要补偿的色度 色散值;
接着, 残余的色度色散和偏振模色散的补偿由自适应均衡模块 109 实 现, 具体地, 通过有限长脉冲响应 (FIR, Finite Impulse Response )蝶形均 衡器来实现, FIR蝶形滤波器釆用自适应算法对系数进行更新, 以跟踪补偿 随时间动态变化的偏振模色散。 FIR蝶形均衡器的功能是实现偏振解复用。 FIR蝶形均衡器具有均衡、 匹配滤波和釆样位置调整的作用。 当釆样位置变 化范围过大, 或者, 存在的釆样频偏使得釆样相位变化范围超过 FIR蝶形 自适应均衡器调整范围时, 会引起 FIR蝶形均衡器无法正常工作。 因此, 需要在 FIR蝶形均衡器之前放一个时钟恢复模块 108。
其中, 时钟恢复模块 108估计输入符号的釆样时间误差, 并对符号的 釆样时间进行插值调整, 或者通过压控振荡器 (VCO, Voltage-Controlled Oscillator )调整 ADC釆样频率, 以保证提供稳定的符号釆样相位。 在对符 号的釆样时间进行插值调整, 或者通过 VCO调整 ADC釆样频率时, 要求 时钟恢复模块 108 的鉴相器能够容忍一定的信号失真, 而传统的鉴相器通 常仅能容忍很小的色度色散值。 因此, 就要求色散色度补偿模块 107 能够 精确地进行色度色散补偿; 而要求色散色度补偿模块 107 能够精确地进行 色度色散补偿, 就需要色度色散估计模块提供精确的要补偿的色度色散值, 换句话说, 需要高精度地测量要补偿的色度色散值。
目前, 还未有高精度地测量要补偿的色度色散值的技术方案。 发明内容
为解决现有存在的技术问题, 本发明实施例提供一种色度色散测量方 法、 装置及数字相干接收机。
本发明实施例提供了一种色度色散测量方法, 包括:
对获取的频域数据进行色度色散序列处理, 得到所述频域数据的色度 色散序列;
对得到的各色度色散序列分别进行预设间隔的相关运算处理, 并将得 到的各相关值求和, 得到第一值;
根据所述第一值、 所述频域数据的单位频点间隔的频率值及所述预设 间隔, 确定色度色散值。
上述方案中, 所述进行色度色散序列处理, 为:
将所述频域数据中的元素与其相距第一距离的另一元素的复共轭相 乘; 其中, 所述第一距离为系统符号速率。
上述方案中, 所述对得到的各频域数据的色度色散序列分别进行预设 间隔的相关运算处理, 为: 素的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
上述方案中, 所述根据所述第一值、 所述频域数据的单位频点间隔的 频率值及所述预设间隔, 确定色度色散值, 包括:
计算第一值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
上述方案中, 所述预设间隔的个数为两个以上时, 两个以上的预设间 隔的取值不同; 相应地, 得到两个以上所述第一值;
在得到第三值时, 所述方法还包括: 将两个以上的所述预设间隔及对 应的两个以上第二值进行解卷绕处理, 得到第三值。
上述方案中, 所述根据第一值、 所述频域数据的单位频点间隔的频率 值及所述预设间隔, 确定色度色散值之前, 所述方法还包括:
对所述第一值进行滤波处理, 得到第六值;
相应地, 根据第六值、 所述频域数据的单位频点间隔的频率值及所述 预设间隔, 确定色度色散值。
上述方案中, 所述根据第六值、 所述频域数据的单位频点间隔的频率 值及所述预设间隔, 确定色度色散值, 包括:
计算第六值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
上述方案中, 所述预设间隔的个数为两个以上时, 两个以上的预设间 隔的取值不同; 相应地, 得到两个以上所述第一值、 两个以上所述第六值 及两个以上所述第二值;
在得到第三值时, 所述方法还包括: 将两个以上的所述预设间隔及对 应的两个以上第二值进行解卷绕处理, 得到第三值。 上述方案中, 所述对获取的频域数据进行色度色散序列处理之前, 所 述方法还包括:
对所述频域数据进行偏振旋转, 生成多个具有不同偏振方向的所述频 域数据;
相应地, 对生成的多个具有不同偏振方向的所述频域数据进行色度色 散序列处理。
上述方案中, 所述对所述频域数据进行偏振旋转之前, 所述方法还包 括:
获取所述频域数据。
本发明实施例还提供了一种色度色散测量装置, 包括: 色度色散序列 处理单元、 相关运算处理单元及确定单元; 其中,
所述色度色散序列处理单元, 配置为对获取的频域数据进行色度色散 序列处理, 得到所述频域数据的色度色散序列; 并将得到的各色度色散序 列发送给所述相关运算处理单元;
所述相关运算处理单元, 配置为收到所述色度色散序列处理单元发送 的得到的各色度色散序列后, 对得到的各色度色散序列分别进行预设间隔 的相关运算处理, 并将得到的各相关值求和, 得到第一值, 并将第一值发 送给所述确定单元;
所述确定单元, 配置为收到所述相关运算处理单元发送的根据第一值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色度色散值。
上述方案中, 所述装置还包括: 滤波单元, 配置为对所述第一值进行 滤波处理, 得到第六值, 并将第六值发送给所述确定单元; 相应地, 所述 确定单元, 配置为根据第六值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 确定色度色散值。
上述方案中, 当所述预设间隔的个数为两个以上时, 所述相关运算处 理单元包含两个以上相关运算处理子单元, 每个相关运算处理子单元, 配 置为进行两个以上所述预设间隔中的一个预设间隔的相关运算处理。
上述方案中, 所述滤波单元包含两个以上滤波子单元;
每个相关运算处理子单元将进行相关运算处理后的数据发送给对应的 滤波子单元; 每个滤波子单元对收到的数据进行滤波处理。
上述方案中, 所述装置还包括: 偏振旋转单元, 配置为对获取的频域 数据进行偏振旋转, 生成多个具有不同偏振方向的频域数据; 并将生成的 多个具有不同偏振方向的频域数据发送给所述色度色散序列处理单元; 相应地, 所述色度色散序列处理单元, 配置为收到所述偏振旋转单元 发送的多个具有不同偏振方向的频域数据后, 对生成的多个具有不同偏振 方向的频域数据进行色度色散序列处理。
上述方案中, 所述装置还包括:
频域数据获取单元, 配置为获取频域数据, 并将获取的频域数据发送 给所述偏振旋转单元;
相应地, 所述偏振旋转单元, 配置为收到频域数据获取单元发送的频 域数据后, 对获取的频域数据进行偏振旋转, 生成多个具有不同偏振方向 的频域数据。
本发明实施例又提供了一种数字相干接收机, 所述数字相干接收机包 括上述的色度色散测量装置。
本发明实施例还提供了一种计算机存储介质, 所述计算机存储介质包 括一组指令, 当执行所述指令时, 引起至少一个处理器执行上述的色度色 散测量方法。
本发明实施例提供的色度色散测量方法、 装置及数字相干接收机, 对 获取的频域数据进行色度色散序列处理, 得到所述频域数据的色度色散序 列; 对得到的各色度色散序列分别进行预设间隔的相关运算处理, 并将得 到的各相关值求和, 得到第一值; 根据所述第一值、 所述频域数据的单位 频点间隔的频率值及所述预设间隔, 确定色度色散值, 如此, 能够精确地 确定色度色散值, 且处理效率高。 附图说明
在附图 (其不一定是按比例绘制的) 中, 相似的附图标记可在不同的 视图中描述相似的部件。 具有不同字母后缀的相似附图标记可表示相似部 件的不同示例。 附图以示例而非限制的方式大体示出了本文中所讨论的各 个实施例。
图 1为典型的数字相干接收机的信号处理框图;
图 2为本发明实施例一色度色散测量方法流程示意图;
图 3为本发明实施例二色度色散测量方法流程示意图;
图 4为本发明实施例三色度色散测量方装置结构示意图;
图 5为本发明实施例四色度色散测量方装置结构示意图;
图 6为本发明实施例五数字相干接收机的信号处理框图;
图 7为本发明实施例五色度色散测量方装置的信号处理框图。 具体实施方式
在本发明的各种实施例中: 对获取的频域数据进行色度色散序列处理, 得到所述频域数据的色度色散序列; 对得到的各色度色散序列分别进行预 设间隔的相关运算处理, 并将得到的各相关值求和, 得到第一值; 根据所 述第一值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定 色度色散值。
下面结合附图及具体实施例对本发明作进一步详细的描述。
实施例一
本实施例色度色散测量方法, 如图 2所示, 包括以下步骤: 步骤 201 : 对获取的频域数据进行色度色散序列处理,得到所述频域数 据的色度色散序列;
这里, 所述进行色度色散序列处理, 具体为:
将所述频域数据中的元素与其相距第一距离的另一元素的复共轭相 乘; 其中, 所述第一距离为系统符号速率。
所述频域数据包括: 第一子频域数据及第二子频域数据; 其中, 所述 第一子频域数据是指: 按照第一光偏振的频域数据; 所述第二子频域数据 是指: 按照第二光偏振的频域数据。 相应地, 得到的所述色度色散序列为 两个色度色散序列, 分别对应第一子频域数据及第二子频域数据。
步骤 202: 对得到的各色度色散序列分别进行预设间隔的相关运算处 理, 并将得到的各相关值求和, 得到第一值;
这里, 所述对得到的各频域数据的色度色散序列分别进行预设间隔的 相关运算处理, 具体为: 素的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
其中, 所述预设间隔为正整数, 比如: 1、 2、 3等等。
依据需要设置所述预设间隔; 所述预设间隔的个数可以为一个以上。 具体地, 当所述预设间隔的个数为一个时, 可以依据所应用的网络环境的 相关参数和指标来设置所述预设间隔; 当所述预设间隔的个数为两个以上 时, 可以依据所应用的网络环境的相关参数和指标, 并结合色度色散的相 关理论来设置各所述预设间隔。
步骤 203: 根据所述第一值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 确定色度色散值。
这里, 所述根据所述第一值、 所述频域数据的单位频点间隔的频率值 及所述预设间隔, 确定色度色散值, 具体包括: 计算第一值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
其中, 将所述根据第一值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 得到色度色散值的具体处理过程釆用公式表达, 则有:
Figure imgf000011_0001
其中, CD表示色度色散值, 其单位为纳米 /纳秒(nm/ns) ; ^表示
2π 第一值的幅角, 其单位为转(turn ); Δ表示预设间隔, 无单位; c表示光速, 其单位为米 /秒(m/s) ; A表示所述频域数据对应的光信号的波长, 其单位 为纳米( nm ); ^表示所述频域数据单位频点间隔的频率值,其单位为 GHz;
nfft
表示系统符号速率, 其单位为 Gbaud; 这里, 所述频域数据对应的光信 号的波长及系统符号速率为设定的值,将釆样率( )除以 FFT点数( φ ), 得到所述频域数据单位频点间隔的频率值。
其中, 当只釆用一个取值较小的所述预设间隔时, 比如: 所述预设间 隔为 1或 2等, 此时, 认为确定的精度较低, 确定出的色度色散值的范围 较大, 不利于后续的时钟恢复处理; 当只釆用一个取值较大的所述预设间 隔时, 比如: 所述预设间隔为 16或 32等, 此时, 认为确定的精度较高, 但确定出的色度色散值的范围较小, 同样不利于后续的时钟恢复处理; 因 此, 可以釆用所述预设间隔的个数为两个以上、 且较大取值与较小取值相 结合的处理方式。 当所述预设间隔的个数为两个以上时, 两个以上的预设间隔的取值不 同; 相应地, 得到的所述第一值的个数为两个以上, 所述第二值的个数也 为两个以上; 举个例子来说, 假设有第一预设间隔及第二预设间隔两个预 设间隔, 第一预设间隔与第二预设间隔的取值不同, 则有对得到的各色度 色散序列分别进行第一预设间隔的相关运算处理, 并将得到的各相关值求 和, 得到一个第一值, 计算这个第一值的幅角, 得到一个第二值; 对得到 的各色度色散序列分别进行第二预设间隔的相关运算处理, 并将得到的各 相关值求和, 得到另一个第一值, 计算所述另一个第一值, 得到另一个第 二值, 即: 得到对应的两个第一值, 相应地, 得到对应的两个第二值。
这种情况下, 在得到第三值时, 该方法还可以包括: 将两个以上的所 述预设间隔及对应的两个以上第二值进行解卷绕处理, 得到第三值。 其中, 当有两个以上的所述预设间隔时, 可能会产生整数倍相位模糊, 因此, 需 要进行解卷绕处理。
实际应用时, 所述将两个以上的所述预设间隔及对应的两个以上第二 值进行解卷绕处理, 得到第三值的具体实现可以有多种, 为本领域技术人 员惯用技术手段。
下面给出一个将两个以上的所述预设间隔及对应的两个以上第二值进 行解卷绕处理, 得到第三值实际应用实例。
具体地, 假设有 N ( N > 1 )个以上所述预设间隔, 且^ < ^ < ... <八^, 各预设间隔对应的第一值分别为 F1 F2... Fw, 则计算各第一值的幅角, 得
当 Δ,时, 幅角为 Φ
Figure imgf000012_0001
当 Δ时, 幅角为 Φ , 以此类推,
2π 2π
Figure imgf000012_0002
对(1)2, (1)3,...., (^进行解卷绕处理, 包括: φ', = φ
2, ..., Ν
Φ' = Φ
Figure imgf000013_0001
其中, ro ί表示四舍五入取整;
相应地, 将解卷绕处理后得到的第三值代入公式(1 ), 则有:
Figure imgf000013_0002
nffi
所述根据第一值、 所述频域数据的单位频点间隔的频率值及所述预设 间隔, 确定色度色散值之前, 该方法还可以包括:
对所述第一值进行滤波处理, 得到第六值; 所述第六值为复数。
相应地, 根据第六值、 所述频域数据的单位频点间隔的频率值及所述 预设间隔, 确定色度色散值;
具体地, 计算第六值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
其中, 将所述根据第六值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 得到色度色散值的具体处理过程釆用公式表达, 则有:
Figure imgf000013_0003
nffi 其中, CD表示色度色散值, 其单位为纳秒 /纳米(ns/nm ); ^表示
2π 第六值的幅角, 其单位为转(turn) ; Δ表示预设间隔, 无单位; c表示光速, 其单位为米 /秒(m/s) ; A表示所述频域数据对应的光信号的波长, 其单位 为纳米( nm); ^表示所述频域数据单位频点间隔的频率值,其单位为 GHz; nfft
表示系统符号速率, 其单位为 Gbaud; 这里, 所述频域数据对应的光信 号的波长及系统符号速率为设定的值,将釆样率( )除以 FFT点数( φ ), 得到所述频域数据单位频点间隔的频率值。
这里, 当所述预设间隔的个数为两个以上, 两个以上的预设间隔的取 值不同, 且根据第一值、 所述频域数据的单位频点间隔的频率值及所述预 设间隔, 确定色度色散值之前, 对所述第一值进行了滤波处理时, 则得到 的所述第一值的个数为两个以上, 所述第六值的个数也为两个以上, 所述 第二值的个数也为两个以上; 举个例子来说, 假设有第一预设间隔及第二 预设间隔两个预设间隔, 第一预设间隔与第二预设间隔的取值不同, 则对 得到的各色度色散序列分别进行第一预设间隔的相关运算处理, 并将得到 的各相关值求和, 得到一个第一值, 对得到的这个第一值进行滤波处理, 得到一个第六值, 计算这个第六值的幅角, 得到一个第二值; 对得到的各 色度色散序列分别进行第二预设间隔的相关运算处理, 并将得到的各相关 值求和, 得到另一个第一值, 对得到的所述另一个第一值进行滤波处理, 得到另一个第六值, 计算所述另一个第六值的幅角, 得到另一个第二值, 即: 得到对应的两个第一值, 相应地, 得到对应的两个第六值, 得到对应 的两个第二值。
这种情况下, 在得到第三值时, 该方法还可以包括: 将两个以上的所 述预设间隔及对应的两个以上第二值进行解卷绕处理, 得到第三值。 其中, 当有两个以上的所述预设间隔时, 可能会产生整数倍相位模糊, 因此, 需 要进行解卷绕处理。
实际应用时, 所述将两个以上的所述预设间隔及对应的两个以上第二 值进行解卷绕处理, 得到第三值的具体实现可以有多种, 为本领域技术人 员惯用技术手段。 本发明实施例提供的色度色散测量方法, 是基于色度色散信道的相关 特征提出的, 能够精确地确定色度色散值, 且处理效率高。
并且, 传统的色度色散测量方法有利用传输质量信息 (如差错率、 Q 因数等) 来进行可变色度色散补偿器的反馈控制的方法。 该方法的基本思 想是: 以一定步长的色度色散间隔, 改变色度色散补偿滤波器的色散补偿 量, 直到数字相干接收机系统收敛。 但是, 釆用该方法时, 由于数字相干 接收机系统启动时, 搜索过程是緩慢的, 因此确定出的色度色散值的精度 低。 另外, 光纤链路受环境温度变化的影响, 链路的色度色散值也会发生 緩慢变化, 因此, 该方法很难判断数字相干接收机系统运行中色度色散值 的緩慢变化。
而实施例提供的色度色散测量方法, 釆用直接计算的方式, 无需搜索, 因此数字相干接收机系统启动时, 可以快速估算到链路的色度色散值; 同 时, 数字相干接收机系统运行中, 也可以继续估算链路色度色散值, 跟踪 其变化, 为色度色散补偿模块提供精确的补偿色散, 从而减小时钟恢复模 块处理的复杂性等。
另外, 釆用所述预设间隔的个数为两个以上的处理方式, 如此, 能更 加准确地确定出色度色散值的范围。
除此以外, 对所述第一值进行滤波处理, 得到第六值; 相应地, 根据 第六值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色 度色散值, 如此, 能更加准确地确定出色度色散值的范围。
实施例二
本实施例色度色散测量方法, 如图 3所示, 包括以下步骤:
步骤 200: 对获取的频域数据进行偏振旋转, 生成多个具有不同偏振方 向的频域数据;
这里, 本步骤的具体实现可釆用现有技术。 生成的具有不同偏振方向的频域数据的具体个数可以根据需要来确 定。
在执行本步骤之前, 该方法还可以包括:
获取频域数据;
具体地, 实际应用时, 可以将收到的时域数据转换为频域数据; 或者, 可以直接获取频域数据。 这里, 将收到的时域数据转换为频域数据为本领 域技术人员惯用技术手段, 不再赘述。
步骤 201 : 对获取的频域数据进行色度色散序列处理,得到所述频域数 据的色度色散序列;
这里, 对获取的频域数据进行色度色散序列处理, 是指: 对生成的多 个具有不同偏振方向的频域数据进行色度色散序列处理。
所述进行色度色散序列处理, 具体为:
将所述频域数据中的元素与其相距第一距离的另一元素的复共轭相 乘; 其中, 所述第一距离为系统符号速率。
所述频域数据包括: 第一子频域数据及第二子频域数据; 其中, 所述 第一子频域数据是指: 按照第一光偏振的频域数据; 所述第二子频域数据 是指: 按照第二光偏振的频域数据。 相应地, 得到的所述色度色散序列为 两个色度色散序列, 分别对应第一子频域数据及第二子频域数据。
步骤 202: 对得到的各色度色散序列分别进行预设间隔的相关运算处 理, 并将得到的各相关值求和, 得到第一值;
这里, 所述对得到的各频域数据的色度色散序列分别进行预设间隔的 相关运算处理, 具体为: 素的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
其中, 所述预设间隔为正整数, 比如: 1、 2、 3等等。 依据需要设置所述预设间隔; 所述预设间隔的个数可以为一个以上。 具体地, 当所述预设间隔的个数为一个时, 可以依据所应用的网络环境的 相关参数和指标来设置所述预设间隔; 当所述预设间隔的个数为两个以上 时, 可以依据所应用的网络环境的相关参数和指标, 并结合色度色散的相 关理论来设置各所述预设间隔。
步骤 203: 根据第一值、 所述频域数据的单位频点间隔的频率值及所述 预设间隔, 确定色度色散值。
这里, 所述根据第一值、 所述频域数据的单位频点间隔的频率值及所 述预设间隔, 确定色度色散值, 具体包括:
计算第一值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
其中, 将所述根据第一值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 得到色度色散值的具体处理过程釆用公式表达, 则有:
Figure imgf000017_0001
其中, CD表示色度色散值, 其单位为纳秒 /纳米(ns/nm) ; ^表示
2π 第一值的幅角, 其单位为转(turn) ; Δ表示预设间隔, 无单位; c表示光速, 其单位为米 /秒(m/s) ; A表示所述频域数据对应的光信号的波长, 其单位为 纳米(nm) ; ^表示所述频域数据单位频点间隔的频率值, 其单位为 GHz;
nfft
表示系统符号速率, 其单位为 Gbaud; 这里, 所述频域数据对应的光信 号的波长及系统符号速率为设定的值,将釆样率( )除以 FFT点数( φ ), 得到所述频域数据单位频点间隔的频率值。
其中, 当只釆用一个取值较小的所述预设间隔时, 比如: 所述预设间 隔为 1或 2等, 此时, 认为确定的精度较低, 确定出的色度色散值的范围 较大, 不利于后续的时钟恢复处理; 当只釆用一个取值较大的所述预设间 隔时, 比如: 所述预设间隔为 16或 32等, 此时, 认为确定的精度较高, 但确定出的色度色散值的范围较小, 同样不利于后续的时钟恢复处理; 因 此, 可以釆用所述预设间隔的个数为两个以上、 且较大取值与较小取值相 结合的处理方式。
当所述预设间隔的个数为两个以上时, 两个以上的预设间隔的取值不 同; 相应地, 得到的所述第一值的个数为两个以上, 所述第二值的个数也 为两个以上; 举个例子来说, 假设有第一预设间隔及第二预设间隔两个预 设间隔, 第一预设间隔与第二预设间隔的取值不同, 则有对得到的各色度 色散序列分别进行第一预设间隔的相关运算处理, 并将得到的各相关值求 和, 得到一个第一值, 计算这个第一值的幅角, 得到一个第二值; 对得到 的各色度色散序列分别进行第二预设间隔的相关运算处理, 并将得到的各 相关值求和, 得到另一个第一值, 计算所述另一个第一值, 得到另一个第 二值, 即: 得到对应的两个第一值, 相应地, 得到对应的两个第二值。
这种情况下, 在得到第三值时, 该方法还可以包括: 将两个以上的所 述预设间隔及对应的两个以上第二值进行解卷绕处理, 得到第三值。 其中, 当有两个以上的所述预设间隔时, 可能会产生整数倍相位模糊, 因此, 需 要进行解卷绕处理。
实际应用时, 所述将两个以上的所述预设间隔及对应的两个以上第二 值进行解卷绕处理, 得到第三值的具体实现可以有多种, 为本领域技术人 员惯用技术手段。 下面给出一个将两个以上的所述预设间隔及对应的两个以上第二值进 行解卷绕处理, 得到第三值实际应用实例。
具体地, 假设有 N (N> 1 )个以上所述预设间隔, 且 A <Δ2 各预设间隔对应的第一值分别为 F1 F2...Fw, 则计算各第一值的幅角, 得 到:
当 时, 幅角为 , 以此类推,
Figure imgf000019_0001
当 时, 幅角为 Φ =^
Ν Ν
对(1>2,(1)3,....,(^进行解卷绕处理, 包括:
, « = 2,...,N;
Φ'„ = Φ„
Figure imgf000019_0002
其中, ro ί表示四舍五入取整;
相应地, 将解卷绕处理后得到的第三值代入公式(1), 则有:
Figure imgf000019_0003
nffi
所述根据第一值、 所述频域数据的单位频点间隔的频率值及所述预设 间隔, 确定色度色散值之前, 该方法还可以包括:
对所述第一值进行滤波处理, 得到第六值; 所述第六值为复数。
相应地, 根据第六值、 所述频域数据的单位频点间隔的频率值及所述 预设间隔, 确定色度色散值;
具体地, 计算第六值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值; 将第三值与第五值相乘, 得到色度色散值。
其中, 将所述根据第六值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 得到色度色散值的具体处理过程釆用公式表达, 则有:
Figure imgf000020_0001
其中, CD表示色度色散值, 其单位为纳秒 /纳米(ns/nm) ; 第六值的幅角, 其单位为转(turn) ; Δ表示预设间隔, 无单位; c表示光速, 其单位为米 /秒(m/s) ; A表示所述频域数据对应的光信号的波长, 其单位为 纳米(nm) ; ^表示所述频域数据单位频点间隔的频率值, 其单位为 GHz; 表示系统符号速率, 其单位为 Gbaud; 这里, 所述频域数据对应的光信 号的波长及系统符号速率为设定的值,将釆样率( )除以 FFT点数( φ ), 得到所述频域数据单位频点间隔的频率值。
这里, 当所述预设间隔的个数为两个以上, 两个以上的预设间隔的取 值不同, 且根据第一值、 所述频域数据的单位频点间隔的频率值及所述预 设间隔, 确定色度色散值之前, 对所述第一值进行了滤波处理时, 则得到 的所述第一值的个数为两个以上, 所述第六值的个数也为两个以上, 所述 第二值的个数也为两个以上; 举个例子来说, 假设有第一预设间隔及第二 预设间隔两个预设间隔, 第一预设间隔与第二预设间隔的取值不同, 则对 得到的各色度色散序列分别进行第一预设间隔的相关运算处理, 并将得到 的各相关值求和, 得到一个第一值, 对得到的这个第一值进行滤波处理, 得到一个第六值, 计算这个第六值的幅角, 得到一个第二值; 对得到的各 色度色散序列分别进行第二预设间隔的相关运算处理, 并将得到的各相关 值求和, 得到另一个第一值, 对所述另一个第一值进行滤波处理, 得到另 一个第六值, 计算所述另一个第六值的幅角, 得到另一个第二值, 即: 得 到对应的两个第一值, 相应地, 得到对应的两个第六值, 得到对应的两个 第二值。
这种情况下, 在得到第三值时, 该方法还可以包括: 将两个以上的所 述预设间隔及对应的两个以上第二值进行解卷绕处理, 得到第三值。 其中, 当有两个以上的所述预设间隔时, 可能会产生整数倍相位模糊, 因此, 需 要进行解卷绕处理。
实际应用时, 所述将两个以上的所述预设间隔及对应的两个以上第二 值进行解卷绕处理, 得到第三值的具体实现可以有多种, 为本领域技术人 员惯用技术手段。
本发明实施例提供的色度色散测量方法, 是基于色度色散信道的相关 特征提出的, 能够精确地确定色度色散值, 且处理效率高。
并且, 传统的色度色散测量方法有利用传输质量信息 (如差错率、 Q 因数等) 来进行可变色度色散补偿器的反馈控制的方法。 该方法的基本思 想是: 以一定步长的色度色散间隔, 改变色度色散补偿滤波器的色散补偿 量, 直到数字相干接收机系统收敛。 但是, 釆用该方法时, 由于数字相干 接收机系统启动时, 搜索过程是緩慢的, 因此确定出的色度色散值的精度 低。 另外, 光纤链路受环境温度变化的影响, 链路的色度色散值也会发生 緩慢变化, 因此, 该方法很难判断数字相干接收机系统运行中色度色散值 的緩慢变化。
而实施例提供的色度色散测量方法, 釆用直接计算的方式, 无需搜索, 因此数字相干接收机系统启动时, 可以快速估算到链路的色度色散值; 同 时, 数字相干接收机系统运行中, 也可以继续估算链路色度色散值, 跟踪 其变化, 为色度色散补偿模块提供精确的补偿色散, 从而减小时钟恢复模 块处理的复杂性等。
另外, 釆用所述预设间隔的个数为两个以上的处理方式, 如此, 能更 加准确地确定出色度色散值的范围。
除此以外, 对所述第一值进行滤波处理, 得到第六值; 相应地, 根据 第六值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色 度色散值, 如此, 能更加准确地确定出色度色散值的范围。
实施例三
为实现实施例一的方法, 本实施例提供了一种色度色散测量装置, 如 图 4所示, 该装置包括: 色度色散序列处理单元 41、 相关运算处理单元 42 及确定单元 43; 其中,
色度色散序列处理单元 41, 配置为对获取的频域数据进行色度色散序 列处理, 得到所述频域数据的色度色散序列; 并将得到的各色度色散序列 发送给相关运算处理单元 42;
相关运算处理单元 42,配置为收到色度色散序列处理单元 41发送的得 到的各色度色散序列后, 对得到的各色度色散序列分别进行预设间隔的相 关运算处理, 并将得到的各相关值求和, 得到第一值, 并将第一值发送给 确定单元 43 ;
确定单元 43, 配置为收到相关运算处理单元 42发送的根据第一值、 所 述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色度色散值。 其中,
所述进行色度色散序列处理, 具体为:
将所述频域数据中的元素与其相距第一距离的另一元素的复共轭相 乘; 其中, 所述第一距离为系统符号速率。
所述频域数据包括: 第一子频域数据及第二子频域数据; 其中, 所述 第一子频域数据是指: 按照第一光偏振的频域数据; 所述第二子频域数据 是指: 按照第二光偏振的频域数据。 相应地, 得到的所述色度色散序列为 两个色度色散序列, 分别对应第一子频域数据及第二子频域数据。 所述对得到的各频域数据的色度色散序列分别进行预设间隔的相关运 算处理, 具体为: 素的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
其中, 所述预设间隔为正整数, 比如: 1、 2、 3等等。
依据需要设置所述预设间隔; 所述预设间隔的个数可以为一个以上。 具体地, 当所述预设间隔的个数为一个时, 可以依据所应用的网络环境的 相关参数和指标来设置所述预设间隔; 当所述预设间隔的个数为两个以上 时, 可以依据所应用的网络环境的相关参数和指标, 并结合色度色散的相 关理论来设置各所述预设间隔。
所述确定单元 43, 具体配置为:
计算第一值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
其中, 将所述根据第一值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 得到色度色散值的具体处理过程釆用公式表达, 则有:
Figure imgf000023_0001
其中, CD表示色度色散值, 其单位为纳秒 /纳米(ns/nm) ; ^表示第
2π 一值的幅角, 其单位为转(turn) ; Δ表示预设间隔, 无单位; c表示光速, 其单位为米 /秒(m/s) ; A表示所述频域数据对应的光信号的波长, 其单位为 纳米(nm) ; ^表示所述频域数据单位频点间隔的频率值, 其单位为 GHz; nfft
表示系统符号速率, 其单位为 Gbaud; 这里, 所述频域数据对应的光信 号的波长及系统符号速率为设定的值,将釆样率( )除以 FFT点数( φ ), 得到所述频域数据单位频点间隔的频率值。
其中, 当只釆用一个取值较小的所述预设间隔时, 比如: 所述预设间 隔为 1或 2等, 此时, 认为确定的精度较低, 确定出的色度色散值的范围 较大, 不利于后续的时钟恢复处理; 当只釆用一个取值较大的所述预设间 隔时, 比如: 所述预设间隔为 16或 32等, 此时, 认为确定的精度较高, 但确定出的色度色散值的范围较小, 同样不利于后续的时钟恢复处理; 因 此, 可以釆用所述预设间隔的个数为两个以上、 且较大取值与较小取值相 结合的处理方式。
当所述预设间隔的个数为两个以上时, 两个以上的预设间隔的取值不 同; 相应地, 得到的所述第一值的个数为两个以上, 所述第二值的个数也 为两个以上,即:相关运算处理单元 42包含两个以上相关运算处理子单元; 举个例子来说, 假设有第一预设间隔及第二预设间隔两个预设间隔, 第一 预设间隔与第二预设间隔的取值不同, 相关运算处理单元 42包含第一相关 运算处理子单元及第二相关运算处理子单元, 则由第一相关运算处理子单 元对得到的各色度色散序列分别进行第一预设间隔的相关运算处理, 并将 得到的各相关值求和, 得到一个第一值, 再由确定单元 43计算这个第一值 的幅角, 得到一个第二值; 并由第二相关运算处理子单元对得到的各色度 色散序列分别进行第二预设间隔的相关运算处理, 并将得到的各相关值求 和, 得到另一个第一值, 再由确定单元 43计算所述另一个第一值, 得到另 一个第二值, 即: 得到对应的两个第一值, 相应地, 得到对应的两个第二 值。
这种情况下, 在得到第三值时, 所述确定单元 43还配置为将两个以上 的所述预设间隔及对应的两个以上第二值进行解卷绕处理, 得到第三值。 其中, 当有两个以上的所述预设间隔时, 可能会产生整数倍相位模糊, 因 此, 需要进行解卷绕处理。
实际应用时, 所述将两个以上的所述预设间隔及对应的两个以上第二 值进行解卷绕处理, 得到第三值的具体实现可以有多种, 为本领域技术人 员惯用技术手段。
下面给出一个将两个以上的所述预设间隔及对应的两个以上第二值进 行解卷绕处理, 得到第三值实际应用实例。
具体地, 4叚设有 N个以上所述预设间隔, 且^<^<...<八^, 各预设间 隔对应的第一值分别为 F2...Fw, 则计算各第一值的幅角, 得到:
当 时, 幅角为 , 以此类推,
Figure imgf000025_0001
当 时, 幅角为 Φ =^
Ν Ν
对(1>2,(1)3,....,(^进行解卷绕处理, 包括:
Φ',. = Φ,.
Figure imgf000025_0002
其中, ro ί表示四舍五入取整;
相应地, 将解卷绕处理后得到的第三值代入公式(1), 则有:
Figure imgf000025_0003
nffi
该装置还可以包括: 滤波单元 44, 配置为对所述第一值进行滤波处理, 得到第六值, 并将第六值发送给确定单元 43; 所述第六值为复数。
相应地, 所述确定单元 43, 配置为根据第六值、 所述频域数据的单位 频点间隔的频率值及所述预设间隔, 确定色度色散值;
其中, 所述确定单元 43, 具体配置为: 计算第六值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
其中, 将所述根据第六值、 所述频域数据的单位频点间隔的频率值及 所述预设间隔, 得到色度色散值的具体处理过程釆用公式表达, 则有:
Figure imgf000026_0001
其中, CD表示色度色散值, 其单位为纳秒 /纳米(ns/nm) ; ^表示
2π 第六值的幅角, 其单位为转(turn ); Δ表示预设间隔, 无单位; c表示光速, 其单位为米 /秒(m/s) ; A表示所述频域数据对应的光信号的波长, 其单位为 纳米(nm) ; ^表示所述频域数据单位频点间隔的频率值, 其单位为 GHz;
nfft
表示系统符号速率, 其单位为 Gbaud; 这里, 所述频域数据对应的光信 号的波长及系统符号速率为设定的值,将釆样率( )除以 FFT点数( φ ), 得到所述频域数据单位频点间隔的频率值。
这里, 当所述预设间隔的个数为两个以上, 两个以上的预设间隔的取 值不同, 且根据第一值、 所述频域数据的单位频点间隔的频率值及所述预 设间隔, 确定色度色散值之前, 对所述第一值进行了滤波处理时, 则得到 的所述第一值的个数为两个以上, 所述第六值的个数也为两个以上, 所述 第二值的个数也为两个以上, 即: 相关运算处理单元 42包含两个以上相关 运算处理子单元, 相应地, 滤波单元 44包含对应的两个以上滤波子单元; 举个例子来说, 假设有第一预设间隔及第二预设间隔两个预设间隔, 第一 预设间隔与第二预设间隔的取值不同, 相关运算处理单元 42包含第一相关 运算处理子单元及第二相关运算处理子单元, 滤波单元 44包含第一滤波子 单元及第二滤波子单元, 则由第一相关运算处理子单元对得到的各色度色 散序列分别进行第一预设间隔的相关运算处理, 并将得到的各相关值求和, 得到一个第一值; 接着由第一滤波子单元对这个第一值进行滤波处理, 得 到一个第六值;再由确定单元 43计算这个第六值的幅角,得到一个第二值; 并由第二相关运算处理子单元对得到的各色度色散序列分别进行第二预设 间隔的相关运算处理, 并将得到的各相关值求和, 得到另一个第一值; 接 着由第二滤波子单元对所述另一个第一值进行滤波处理, 得到另一个第六 值; 再由确定单元 43计算所述另一个第六值的幅角, 得到另一个第二值, 即: 得到对应的两个第一值, 相应地, 得到对应的两个第六值, 得到对应 的两个第二值。
这种情况下, 在得到第三值时, 所述确定单元 43还配置为将两个以上 的所述预设间隔及对应的两个以上第二值进行解卷绕处理, 得到第三值。 其中, 当有两个以上的所述预设间隔时, 可能会产生整数倍相位模糊, 因 此, 需要进行解卷绕处理。
实际应用时, 所述将两个以上的所述预设间隔及对应的两个以上第二 值进行解卷绕处理, 得到第三值的具体实现可以有多种, 为本领域技术人 员惯用技术手段。
本发明实施例提供的色度色散测量装置, 是基于色度色散信道的相关 特征提出的, 能够精确地确定色度色散值, 且处理效率高。
另外, 釆用所述预设间隔的个数为两个以上的处理方式, 如此, 能更 加准确地确定出色度色散值的范围。
除此以外, 对所述第一值进行滤波处理, 得到第六值; 相应地, 根据 第六值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色 度色散值, 如此, 能更加准确地确定出色度色散值的范围。
实施例四
本实施例提供的色度色散测量装置, 如图 5 所示, 除了实施例三中的 单元外, 该装置还可以包括: 偏振旋转单元 45, 配置为对获取的频域数据 进行偏振旋转, 生成多个具有不同偏振方向的频域数据; 并将生成的多个 相应地, 色度色散序列处理单元 41, 配置为收到偏振旋转单元 45发送 的多个具有不同偏振方向的频域数据后, 对生成的多个具有不同偏振方向 的频域数据进行色度色散序列处理。
该装置还可以包括: 频域数据获取单元 46, 配置为获取频域数据, 并 将获取的频域数据发送给偏振旋转单元 45;
相应地, 偏振旋转单元 45, 配置为收到频域数据获取单元 46发送的频 域数据后, 对获取的频域数据进行偏振旋转, 生成多个具有不同偏振方向 的频域数据。
其中, 实际应用时, 频域数据获取单元 46可以将收到的时域数据转换 为频域数据; 或者, 可以从相应的位置直接获取频域数据。 这里, 将收到 的时域数据转换为频域数据为本领域技术人员惯用技术手段, 不再赘述。
结合实施例三及实施例四, 实际应用时, 色度色散序列处理单元、 相 关运算处理单元、 确定单元以及频域数据获取单元可由色度色散测量装置 中的中央处理器 (CPU, Central Processing Unit ), 数字信号处理器 (DSP, Digital Signal Processor )或可编程逻辑阵列 ( FPGA, Field - Programmable Gate Array ) 实现; 滤波单元可由色度色散测量装置中的滤波器实现, 具体 地, 可以是低通滤波器; 偏振旋转单元可由色度色散测量装置中的偏振旋 转滤波器组实现。
实施例五 图 6 为本发明实施例提供的数字相干接收机的信号处理框图, 如图 6 所示, 本实施例提供的色度色散测量装置位于色散色度补偿模块 607 中, 可由色散色度补偿模块 607的 FFT子模块直接为色度色散测量装置提供频 域数据。
本实施例中: FFT点数为 4096, 色散色度补偿模块 607输入的时域数 据为 2倍过釆样率, 因此, 系统符号速率为 4096/2=2048; 频域数据对应的 光信号的波长为 1550ns, 釆样率为 4096。
图 7为本实施例色度色散测量装置的信号处理框图, 如图 7所示, 该 装置包括: 频域数据获取单元 71、 偏转旋转滤波器组 72、 色度色散序列处 理单元 73、 第一相关运算处理子单元 74、 第二相关运算处理子单元 75、 第 一滤波子单元 76、 第二滤波子单元 77、 以及确定单元 78; 对应的信号处理 过程包括以下步骤:
步骤 A:频域数据获取单元 71从色散色度补偿模块的 FFT子模块直接 获取频域数据, 并将获取的频域数据发送给偏转旋转滤波器组 72;
这里, 获取的频域数据第一子频域数据 及第二子频域数据 ; 其中, 所述第一子频域数据是指: 按照第一光偏振的频域数据; 所述第二子频域 数据是指: 按照第二光偏振的频域数据。
步骤 B: 偏转旋转滤波器组 72将频域数据获取单元 71发送的频域数 据, 进行偏振旋转, 生成三个具有不同偏振方向的频域数据, 并将生成的 三个具有不同偏振方向的频域数据发送给色度色散序列处理单元 73;
这里, 生成的三个具有不同偏振方向的频域数据可以表示为:
Figure imgf000029_0001
X2[k] = X[k] + Pi- Y[k] .
X3[k] = X[k] + Y[k] '
Λ = 0, ..., 4095 步骤 C: 色度色散序列处理单元 73对生成的三个具有不同偏振方向的 频域数据进行色度色散序列处理, 并将得到的三个色度色散序列分别发送 给第一相关运算处理子单元 74及第二相关运算处理子单元 75 ;
这里, 所述进行色度色散序列处理, 具体为:
将所述频域数据中的元素与其相距第一距离的另一元素的复共轭相 乘; 其中, 所述第一距离为系统符号速率。
得到的三个色度色散序列 ( R ^ R3 )可以表示为:
Cn[k] = Xn [k] * conj(Xn [k + 2048]), k = Q, ..., 2047, " = 1,2,3 ;
步骤 D: 第一相关运算处理子单元 74将得到的三个色度色散序列进行 第一预设间隔的相关运算处理, 并将得到的各相关值求和, 得到一个第一 值, 并将得到的这个第一值发送给第一滤波子单元 76;
这里, 所述进行第一预设间隔的相关运算处理, 具体为:
分别将三个色度色散序列中的元素与其相距第一预设间隔的另一元素 的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
假设第一预设间隔为 , 则这个第一值可以表示为: (C„[ AJ));
1
步骤 E: 第一滤波子单元 76对得到的 Fi i行滤波处理, 得到一个第六 值, 并将得到的这个第六值发送给确定单元 78;
这里, 第一滤波子单元 76为低通滤波器。
这个第六值用公式表达, 可以表示为:
01 =∑^ [/];
1
其中, 表示取得的 F 次数; 这里, 根据需要, 确定 的具体取值。 为复数。
步骤 F: 第一相关运算处理子单元 75将得到的三个色度色散序列进行 第二预设间隔的相关运算处理, 并将得到的各相关值求和, 得到另一个第 一值, 并将得到的另一个第一值发送给第二滤波子单元 77;
这里, 所述进行第一预设间隔的相关运算处理, 具体为:
分别将三个色度色散序列中的元素与其相距第一预设间隔的另一元素 的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
假设第二预设间隔为 Δ2, 则另一个第一值可以表示为:
F2 =∑ 0∑ {Cn[k]*conj(Cn[k + A2]))-,
二 1
步骤 G: 第二滤波子单元 77对得到的 F2进行滤波处理,得到一个第六 值, 并将得到的另一个第六值发送给确定单元 78;
这里, 第二滤波子单元 77为低通滤波器。
另一个第六值用公式表达, 可以表示为:
Figure imgf000031_0001
其中, 表示取得的 F2的次数; 这里, 根据需要, 确定 的具体取值。 G2为复数。
这里, 步骤 D~E和步骤 F~G执行上没有先后顺序。
步骤 H: 确定单元收到两个第六值后, 分别计算两个第六值的幅角, 并将两个预设间隔及两个第二值进行解卷绕处理;
这里, 本步骤的具体实现包括:
步骤 HI: 分别计算两个第六值的幅角, 则有:
φ );
1 2π φ );
2 2π e卜 0.5,0.5), Φ2 £卜0.5,0.5)。
步骤 Η2: 由 和 Φ2进行解卷绕处理; 具体地, 假设 Δ1 = 2, Δ2 = 32 , 则有 Δ ^ = 16 ; 计算
φ' ,
Φ
Figure imgf000032_0001
其中, rowwi表示四舍五入取整; Φ'2为解卷绕后的值。
步骤 Η3 : 确定色度色散值。
具体地, 根据公式: 0) = , 计算色度色散值。
Figure imgf000032_0002
nffi
其中, 当频域数据对应的波长、 FFT 点数系统符号速率及釆样率确定 后, —— -——的值为一个常数, 因此, —— -——可以称为色散色度比例
Λ2 X -^1- X f, λ2 χ - X fr,
nffi nffi 关系系数; 在本实施例中, 的值为 249567 ps/nm; 其中, c的取 λ2 X― X fd
nffi
值为 299792458m/s。 本发明实施例釆用了两个预设间隔进行相关运算处理, 因此, 能达到 较高的色散估计精度。
除此以外, 对所述第一值进行滤波处理, 得到第六值; 相应地, 根据 第六值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色 度色散值, 如此, 能更加准确地确定出色度色散值的范围。
基于上述色度色散测量装置, 本发明实施例还提供了一种数字相干接 收机, 包括图 4、 或图 5所示的色度色散测量装置的基本结构及其各种变形 和等同替换, 不做赘述。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 系统、 或计算机程序产品。 因此, 本发明可釆用硬件实施例、 软件实施例、 或结 合软件和硬件方面的实施例的形式。 而且, 本发明可釆用在一个或多个其 中包含有计算机可用程序代码的计算机可用存储介质 (包括但不限于磁盘 存储器和光学存储器等 )上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(系统)、 和计算机程序 产品的流程图和 /或方框图来描述的。 应理解可由计算机程序指令实现流程 图和 /或方框图中的每一流程和 /或方框、以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器, 使得 在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功 能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理 设备以特定方式工作的计算机可读存储器中, 使得存储在该计算机可读存 储器中的指令产生包括指令装置的制造品, 该指令装置实现在流程图一个 流程或多个流程和 /或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备 上, 使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机 实现的处理, 从而在计算机或其他可编程设备上执行的指令提供用于实现 在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功 能的步骤。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种色度色散测量方法, 所述方法包括:
对获取的频域数据进行色度色散序列处理, 得到所述频域数据的色度 色散序列;
对得到的各色度色散序列分别进行预设间隔的相关运算处理, 并将得 到的各相关值求和, 得到第一值;
根据所述第一值、 所述频域数据的单位频点间隔的频率值及所述预设 间隔, 确定色度色散值。
2、 根据权利要求 1所述的方法, 其中, 所述进行色度色散序列处理, 为:
将所述频域数据中的元素与其相距第一距离的另一元素的复共轭相 乘; 其中, 所述第一距离为系统符号速率。
3、 根据权利要求 1所述的方法, 其中, 所述对得到的各频域数据的色 度色散序列分别进行预设间隔的相关运算处理, 为: 素的复共轭相乘, 并将得到的各乘积求和, 得到各相关值。
4、 根据权利要求 1至 3任一项所述的方法, 其中, 所述根据所述第一 值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色度色 散值, 包括:
计算第一值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
5、 根据权利要求 4所述的方法, 其中, 所述预设间隔的个数为两个以 上时, 两个以上的预设间隔的取值不同; 相应地, 得到两个以上所述第一 值;
在得到第三值时, 所述方法还包括: 将两个以上的所述预设间隔及对 应的两个以上第二值进行解卷绕处理, 得到第三值。
6、 根据权利要求 1至 3任一项所述的方法, 其中, 所述根据第一值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色度色散值 之前, 所述方法还包括:
对所述第一值进行滤波处理, 得到第六值;
相应地, 根据第六值、 所述频域数据的单位频点间隔的频率值及所述 预设间隔, 确定色度色散值。
7、 根据权利要求 6所述的方法, 其中, 所述根据第六值、 所述频域数 据的单位频点间隔的频率值及所述预设间隔, 确定色度色散值, 包括: 计算第六值的幅角, 得到第二值;
将第二值除以所述预设间隔, 得到第三值;
将所述频域数据对应的光信号的波长的平方、 所述频域数据单位频点 间隔的频率值以及系统符号速率相乘, 得到第四值;
将光速除以第四值, 得到第五值;
将第三值与第五值相乘, 得到色度色散值。
8、 根据权利要求 7所述的方法, 其中, 所述预设间隔的个数为两个以 上时, 两个以上的预设间隔的取值不同; 相应地, 得到两个以上所述第一 值、 两个以上所述第六值及两个以上所述第二值;
在得到第三值时, 所述方法还包括: 将两个以上的所述预设间隔及对 应的两个以上第二值进行解卷绕处理, 得到第三值。
9、 根据权利要求 1至 3任一项所述的方法, 其中, 所述对获取的频域 数据进行色度色散序列处理之前, 所述方法还包括:
对所述频域数据进行偏振旋转, 生成多个具有不同偏振方向的所述频 域数据;
相应地, 对生成的多个具有不同偏振方向的所述频域数据进行色度色 散序列处理。
10、 根据权利要求 9所述的方法, 其中, 所述对所述频域数据进行偏 振旋转之前, 所述方法还包括:
获取所述频域数据。
11、 一种色度色散测量装置, 所述装置包括: 色度色散序列处理单元、 相关运算处理单元及确定单元; 其中,
所述色度色散序列处理单元, 配置为对获取的频域数据进行色度色散 序列处理, 得到所述频域数据的色度色散序列; 并将得到的各色度色散序 列发送给所述相关运算处理单元;
所述相关运算处理单元, 配置为收到所述色度色散序列处理单元发送 的得到的各色度色散序列后, 对得到的各色度色散序列分别进行预设间隔 的相关运算处理, 并将得到的各相关值求和, 得到第一值, 并将第一值发 送给所述确定单元;
所述确定单元, 配置为收到所述相关运算处理单元发送的根据第一值、 所述频域数据的单位频点间隔的频率值及所述预设间隔, 确定色度色散值。
12、根据权利要求 11所述的装置, 其中, 所述装置还包括: 滤波单元, 配置为对所述第一值进行滤波处理, 得到第六值, 并将第六值发送给所述 确定单元; 相应地, 所述确定单元, 配置为根据第六值、 所述频域数据的 单位频点间隔的频率值及所述预设间隔, 确定色度色散值。
13、 根据权利要求 11或 12所述的装置, 其中, 当所述预设间隔的个 数为两个以上时, 所述相关运算处理单元包含两个以上相关运算处理子单 元, 每个相关运算处理子单元, 配置为进行两个以上所述预设间隔中的一 个预设间隔的相关运算处理。
14、 根据权利要求 13所述的装置, 其中, 所述滤波单元包含两个以上 滤波子单元;
每个相关运算处理子单元将进行相关运算处理后的数据发送给对应的 滤波子单元; 每个滤波子单元对收到的数据进行滤波处理。
15、 根据权利要求 11或 12所述的装置, 其中, 所述装置还包括: 偏 振旋转单元, 配置为对获取的频域数据进行偏振旋转, 生成多个具有不同 偏振方向的频域数据; 并将生成的多个具有不同偏振方向的频域数据发送 给所述色度色散序列处理单元;
相应地, 所述色度色散序列处理单元, 配置为收到所述偏振旋转单元 发送的多个具有不同偏振方向的频域数据后, 对生成的多个具有不同偏振 方向的频域数据进行色度色散序列处理。
16、 根据权利要求 15所述的装置, 其中, 所述装置还包括: 频域数据获取单元, 配置为获取频域数据, 并将获取的频域数据发送 给所述偏振旋转单元;
相应地, 所述偏振旋转单元, 配置为收到频域数据获取单元发送的频 域数据后, 对获取的频域数据进行偏振旋转, 生成多个具有不同偏振方向 的频域数据。
17、 一种数字相干接收机, 其中, 所述数字相干接收机包括如权利要 求 11至 16任一项所述的色度色散测量装置。
18、 一种计算机存储介质, 所述计算机存储介质包括一组指令, 当执 行所述指令时, 引起至少一个处理器执行所述如权利要求 1至 10任一项所 述的色度色散测量方法。
PCT/CN2014/074567 2014-01-15 2014-04-01 一种色度色散测量方法、装置及数字相干接收机 WO2015106494A1 (zh)

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