WO2018094574A1 - 一种色散补偿方法及装置 - Google Patents

一种色散补偿方法及装置 Download PDF

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Publication number
WO2018094574A1
WO2018094574A1 PCT/CN2016/106812 CN2016106812W WO2018094574A1 WO 2018094574 A1 WO2018094574 A1 WO 2018094574A1 CN 2016106812 W CN2016106812 W CN 2016106812W WO 2018094574 A1 WO2018094574 A1 WO 2018094574A1
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signal
phase compensation
subcarrier
value
optical
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PCT/CN2016/106812
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English (en)
French (fr)
Inventor
张亮
周杰
左天健
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华为技术有限公司
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Priority to CN201680090979.3A priority Critical patent/CN109983718B/zh
Priority to PCT/CN2016/106812 priority patent/WO2018094574A1/zh
Publication of WO2018094574A1 publication Critical patent/WO2018094574A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion

Definitions

  • the present invention relates to the field of optical fiber communication technologies, and in particular, to a dispersion compensation method and apparatus.
  • optical fiber communication systems are widely used in signal transmission processes due to their high speed and large capacity.
  • the problem of dispersion of optical signals in fiber optic links has been a major problem that constrains the performance of fiber-optic communication systems.
  • the transmitting end performs dispersion compensation on the signal to be transmitted according to the estimated dispersion value, and transmits the dispersion-compensated signal to the receiving end to reduce the light received by the receiving end.
  • the degree of dispersion of the signal For example, suppose the dispersion expression is H(w) and the transmitter signal is Txwave.
  • the inverse function 1/H(w) of the dispersion expression is usually superimposed on the signal to be transmitted, then the dispersion compensation is added.
  • Txwave_comp IFFT(FFT(Txwave)/H(w)), where FFT represents Fast Fourier Transformation (FFT) and IFFT represents Inverse Fast Fourier Transform (Inverse Fast Fourier Transform, IFFT).
  • a dispersion compensation method and device are provided for implementing a compensation optical fiber communication system Dispersion in the middle.
  • an embodiment of the present invention provides a dispersion compensation method, where the method includes:
  • the transmitting end of the optical fiber communication system receives the indication information sent by the receiving end of the optical fiber communication system, and the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end.
  • the transmitting end performs phase compensation on the plurality of subcarrier signals by using a plurality of optimal phase compensation values according to the one-to-one correspondence relationship to obtain a second multicarrier signal; and the transmitting end optically modulates the second multicarrier signal to obtain the first
  • the optical signal transmits the first optical signal to the receiving end.
  • the one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end means that for each subcarrier in the first multicarrier signal
  • there is a unique optimal phase compensation value corresponding to the subcarrier signal and the optimal phase compensation value is used for phase compensation of the subcarrier signal, the number of the plurality of optimal compensation values and the plurality of subcarrier signals The number is the same.
  • the indication information sent by the receiving end to the transmitting end includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end, and the transmitting end includes the indication information according to the indication information.
  • the one-to-one correspondence uses a plurality of optimal phase compensation values to phase compensate a plurality of subcarrier signals in the first multicarrier signal. Since the transmitting end performs dispersion compensation on the first multi-carrier signal, a plurality of optimal phase compensation values are used according to a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multi-carrier signal.
  • the method provided by the first aspect is directed to the first multicarrier Each subcarrier signal in the signal is separately compensated, and thus the dispersion compensation is more accurate.
  • the following operations may also be performed, so that the receiving end can determine the one-to-one correspondence:
  • the transmitting end determines a plurality of preset phase compensation values; the transmitting end respectively performs the following operations on the first multi-carrier signal by using each of the preset phase compensation values: using the preset phase compensation value to the first Phase compensation for each subcarrier signal in the multicarrier signal to obtain a third multicarrier a signal; optically modulating the third multi-carrier signal to obtain a second optical signal, and transmitting the second optical signal to the receiving end, where the second optical signal is used by the receiving end according to the performance of the plurality of sub-carrier signals included in the second optical signal
  • the indicator value determines the one-to-one correspondence.
  • the performance indicator values of the plurality of subcarrier signals included in the second optical signal include, but are not limited to, a signal to noise ratio SNR and/or a bit error rate BER.
  • the optimum phase compensation value is set as follows:
  • the preset phase compensation value used when the SNR of the subcarrier signal in the plurality of second optical signals is maximum is the optimal phase compensation value corresponding to the subcarrier signal;
  • the preset phase compensation value used when the BER of the subcarrier signal in the plurality of second optical signals is minimum is the optimal phase compensation value corresponding to the subcarrier signal.
  • the plurality of optimal phase compensation values are based on the phase compensation test of the first multi-carrier signal by using a plurality of preset phase compensation values respectively at the transmitting end, and the receiving end is configured according to each of the second optical signals.
  • the performance value of the plurality of subcarrier signals included in the second optical signal is determined.
  • the receiving end determines the performance index value of the plurality of subcarrier signals included in each of the second optical signals, and thus may perform the phase compensated first multicarrier signal (ie, the second multicarrier).
  • the performance index value of the signal is better, and the performance index value of the first optical signal obtained by the second multi-carrier signal is also better.
  • each of the preset phase compensation values is located in the same setting interval; when the plurality of preset phase compensation values are arranged in numerical order, multiple pre- Let the difference between any two adjacent phase compensation values in the phase compensation value be the preset step size.
  • each preset phase compensation value is set in the set interval, and the preset setting of the preset phase compensation value can be avoided; at the same time, the plurality of preset phase compensation values are evenly distributed evenly within the set interval.
  • the distribution is such that the plurality of optimal phase compensation values are selected more accurately, so that the dispersion compensation effect is better.
  • the second multicarrier signal may also be inverse Fourier transformed before the transmitting end optically modulates the second multicarrier signal.
  • the second multicarrier signal in the frequency domain is thereby converted into a second multicarrier signal in the time domain. Converting the second multi-carrier signal in the frequency domain into the second multi-carrier signal in the time domain and then performing optical modulation is easier to implement.
  • an embodiment of the present invention provides a dispersion compensation method, which includes: determining, by a receiving end of an optical fiber communication system, a plurality of optimal phase compensation values and a plurality of first multi-carrier signals to be transmitted by a transmitting end of the optical fiber communication system; a one-to-one correspondence relationship of the subcarrier signals; the receiving end generates indication information, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal; the receiving end sends the indication information to The transmitting end.
  • the one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end means that for each subcarrier signal in the first multicarrier signal, there is a unique An optimal phase compensation value is associated with the subcarrier signal, and the optimal phase compensation value is used for phase compensation of the subcarrier signal, that is, the number of the plurality of optimal compensation values is the same as the number of the plurality of subcarrier signals.
  • the indication information sent by the receiving end to the transmitting end includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end, and the transmitting end includes the indication information according to the indication information.
  • the one-to-one correspondence uses a plurality of optimal phase compensation values to phase compensate a plurality of subcarrier signals in the first multicarrier signal. Since the transmitting end performs dispersion compensation on the first multi-carrier signal, a plurality of optimal phase compensation values are used according to a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multi-carrier signal.
  • the method provided by the second aspect is directed to the first multicarrier, compared with the prior art using the dispersion expression to compensate the signal to be transmitted at the transmitting end.
  • Each subcarrier signal in the signal is separately compensated, and thus the dispersion compensation is more accurate.
  • the following steps may be performed to determine the one-to-one correspondence: the receiving end receives the plurality of second optical signals sent by the transmitting end, and the plurality of second optical signals
  • the plurality of second multi-carrier signals are respectively optically modulated by the transmitting end, and the plurality of second multi-carrier signals are each preset phase compensation of the plurality of preset phase compensation values for the transmitting end.
  • the values are respectively obtained by phase-compensating each sub-carrier signal in the first multi-carrier signal; the receiving end calculates a performance index value of the plurality of sub-carrier signals included in each of the plurality of second optical signals; And determining, according to the calculated performance indicator value, an optimal phase compensation value corresponding to each subcarrier signal in the first multicarrier signal.
  • the receiving end respectively determines an optimal phase compensation value corresponding to each subcarrier signal in the first multicarrier signal according to the calculated performance index value, which can be implemented as follows:
  • the receiving end acquires, from the calculated performance indicator value, a performance indicator value of the subcarrier signal of each of the plurality of second optical signals; the receiving end determines the performance index value of the subcarrier signal in each second optical signal.
  • the optimal performance index value, and the preset phase compensation value used when obtaining the optimal performance index value is taken as the optimal phase compensation value corresponding to the subcarrier signal.
  • the plurality of optimal phase compensation values are based on the phase compensation test of the first multi-carrier signal by using a plurality of preset phase compensation values respectively at the transmitting end, and the receiving end is configured according to each of the second optical signals.
  • the performance value of the plurality of subcarrier signals included in the second optical signal is determined.
  • the receiving end determines the performance index value of the plurality of subcarrier signals included in each of the second optical signals, and thus may perform the phase compensated first multicarrier signal (ie, the second multicarrier).
  • the performance index value of the signal is better, and the performance index value of the first optical signal obtained by the second multi-carrier signal is also better.
  • the performance index values of the plurality of subcarrier signals included in each second optical signal include a signal to noise ratio SNR and/or a bit error rate BER;
  • the receiving end determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value when the optimal performance index value is obtained.
  • the optimal phase compensation value corresponding to the subcarrier signal is specifically: the receiving end determines the SNR maximum value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value used when obtaining the SNR maximum value as the sub The optimal phase compensation value corresponding to the carrier signal;
  • the receiving end determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value when the optimal performance index value is obtained.
  • the optimal phase compensation value corresponding to the subcarrier signal is specifically: the receiving end determines the SNR maximum value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value used when obtaining the SNR maximum value as the sub The optimum phase compensation value corresponding to the carrier signal.
  • each of the preset phase compensation values is located in the same setting interval; when the plurality of preset phase compensation values are arranged in numerical order, multiple pre- Let the difference between any two adjacent phase compensation values in the phase compensation value be the preset step size.
  • each preset phase compensation value is set in the set interval, and the preset setting of the preset phase compensation value can be avoided; at the same time, the plurality of preset phase compensation values are evenly distributed evenly within the set interval.
  • the distribution is such that the plurality of optimal phase compensation values are selected more accurately, so that the dispersion compensation effect is better.
  • an embodiment of the present invention provides a dispersion compensation apparatus, where the apparatus includes:
  • a receiving module configured to receive indication information sent by a receiving end of the optical fiber communication system, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted;
  • phase compensation module configured to perform phase compensation on the plurality of subcarrier signals by using a plurality of optimal phase compensation values according to a one-to-one correspondence included in the indication information received by the receiving module, to obtain a second multicarrier signal
  • An optical modulation module configured to perform optical modulation on the second multi-carrier signal obtained by the phase compensation module to obtain a first optical signal
  • a sending module configured to send the first optical signal modulated by the optical modulation module to the receiving end.
  • the one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end means that there is only one for each subcarrier signal in the first multicarrier signal.
  • An optimal phase compensation value is associated with the subcarrier signal, and the optimal phase compensation value is used for phase compensation of the subcarrier signal, and the number of the plurality of optimal compensation values is the same as the number of the plurality of subcarrier signals.
  • the indication information sent by the receiving end to the receiving module includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end, and the phase compensation module follows the indication information.
  • the one-to-one correspondence includes a phase compensation of a plurality of subcarrier signals in the first multicarrier signal by using a plurality of optimal phase compensation values.
  • the phase compensation module uses a plurality of optimal phase compensation according to a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal when performing dispersion compensation on the first multicarrier signal.
  • the value of the plurality of subcarrier signals in the first multicarrier signal is dispersion-compensated, and the device provided by the third aspect is the first one compared with the compensation of the signal to be transmitted at the transmitting end by using the dispersion expression in the prior art.
  • Each subcarrier signal in the carrier signal is separately compensated, and thus the dispersion compensation is more accurate.
  • the device further includes: a determining module, configured to determine a plurality of preset phase compensation values before the receiving module receives the indication information sent by the receiving end; and the phase compensation module is further configured to adopt multiple Each preset phase compensation value of the preset phase compensation value phase compensates each subcarrier signal in the first multicarrier signal to obtain a third multicarrier signal; the optical modulation module is further configured to use the third multicarrier signal Performing optical modulation to obtain a second optical signal, where the second optical signal is used by the receiving end to determine the one-to-one correspondence according to performance index values of the plurality of subcarrier signals included in the second optical signal; and the sending module is further configured to use the second one.
  • the optical signal is sent to the receiving end.
  • the performance indicator values of the plurality of subcarrier signals included in the second optical signal include, but are not limited to, a signal to noise ratio SNR and/or a bit error rate BER.
  • the optimum phase compensation value is set as follows:
  • the preset phase compensation value used when the SNR of the subcarrier signal in the plurality of second optical signals is maximum is the optimal phase compensation value corresponding to the subcarrier signal;
  • the preset phase compensation value used when the BER of the subcarrier signal in the plurality of second optical signals is minimum is the optimal phase compensation value corresponding to the subcarrier signal.
  • the plurality of optimal phase compensation values are based on the phase compensation test of the first multi-carrier signal by using the plurality of preset phase compensation values respectively, and the receiving end is based on The performance index value of the plurality of subcarrier signals included in each of the second optical signals is determined.
  • the receiving end determines the performance index value of the plurality of subcarrier signals included in each of the second optical signals, and thus may perform the phase compensated first multicarrier signal (ie, the second multicarrier).
  • the performance index value of the signal is better, and the performance index value of the first optical signal obtained by the second multi-carrier signal is also better.
  • each of the preset phase compensation values is located in the same setting interval; when the plurality of preset phase compensation values are arranged in numerical order, multiple pre- Let the difference between any two adjacent phase compensation values in the phase compensation value be the preset step size.
  • each preset phase compensation value is set in the set interval, and the preset setting of the preset phase compensation value can be avoided; at the same time, the plurality of preset phase compensation values are evenly distributed evenly within the set interval.
  • the distribution is such that the plurality of optimal phase compensation values are selected more accurately, so that the dispersion compensation effect is better.
  • the dispersion compensation apparatus provided by the above third aspect further includes: an inverse Fourier transform module, configured to: before the optical modulation module optically modulates the second multicarrier signal, to the second multicarrier The signal is inverse Fourier transformed. The second multicarrier signal in the frequency domain is thereby converted into a second multicarrier signal in the time domain. Converting the second multi-carrier signal in the frequency domain into the second multi-carrier signal in the time domain and then performing optical modulation is easier to implement.
  • an inverse Fourier transform module configured to: before the optical modulation module optically modulates the second multicarrier signal, to the second multicarrier The signal is inverse Fourier transformed. The second multicarrier signal in the frequency domain is thereby converted into a second multicarrier signal in the time domain. Converting the second multi-carrier signal in the frequency domain into the second multi-carrier signal in the time domain and then performing optical modulation is easier to implement.
  • an embodiment of the present invention provides a dispersion compensation apparatus, the apparatus comprising:
  • a determining module configured to determine a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end of the optical fiber communication system;
  • the indication information generating module is configured to generate indication information, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal;
  • the sending module is configured to send the indication information to the transmitting end.
  • the one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted refers to that, for each subcarrier signal in the first multicarrier signal, there is The only one of the best phase compensation values corresponds to the subcarrier signal, and the optimum phase compensation value is used for phase compensation of the subcarrier signal, and the number of the plurality of optimal compensation values is the same as the number of the plurality of subcarrier signals.
  • the indication information sent by the sending module end to the transmitting end includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end, and the transmitting end follows the indication information.
  • the one-to-one correspondence includes a phase compensation of a plurality of subcarrier signals in the first multicarrier signal by using a plurality of optimal phase compensation values. Since the transmitting end performs dispersion compensation on the first multi-carrier signal, a plurality of optimal phase compensation values are used according to a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multi-carrier signal.
  • the apparatus provided by the fourth aspect is directed to the first multicarrier, compared with the prior art using a dispersion expression to compensate a signal to be transmitted at a transmitting end. Multiple subcarrier signals in the signal are compensated separately, so dispersion compensation is more accurate.
  • the dispersion compensation apparatus further includes: a receiving module, configured to receive a plurality of second optical signals sent by the transmitting end, and the plurality of second optical signals are transmitted before the determining module determines the one-to-one correspondence
  • the terminal respectively optically modulates the plurality of second multi-carrier signals, and the plurality of second multi-carrier signals are respectively used by the transmitting end to adopt a preset phase compensation value of each of the plurality of preset phase compensation values to the first multi-carrier signal respectively
  • Each of the subcarrier signals is phase compensated;
  • the determining module is specifically configured to: calculate performance index values of the plurality of subcarrier signals included in each of the plurality of second optical signals; and determine the first according to the calculated performance index value The optimum phase compensation value corresponding to each subcarrier signal in a multicarrier signal.
  • the determining module respectively determines an optimal phase compensation value corresponding to each subcarrier signal in the first multicarrier signal according to the calculated performance indicator value, which can be implemented as follows:
  • the optimal performance index value of the performance index value of the subcarrier signal in the signal, and the preset phase compensation value used when obtaining the optimal performance index value is used as the optimal phase compensation value corresponding to the subcarrier signal.
  • the plurality of optimal phase compensation values are based on the phase compensation test of the first multi-carrier signal by using a plurality of preset phase compensation values respectively at the transmitting end, and the determining module is configured according to each of the second optical signals.
  • the performance value of the plurality of subcarrier signals included in the second optical signal is determined.
  • the determining module determines the performance index value of the plurality of subcarrier signals included in each of the second optical signals, and thus may perform the phase compensated first multicarrier signal (ie, the second multicarrier).
  • the performance index value of the signal is better, and the performance index value of the first optical signal obtained by the second multi-carrier signal is also better.
  • the performance index values of the plurality of subcarrier signals included in each second optical signal include a signal to noise ratio SNR and/or a bit error rate BER;
  • the receiving end determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value when the optimal performance index value is obtained.
  • the optimal phase compensation value corresponding to the subcarrier signal is specifically: the receiving end determines the SNR maximum value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value used as the SNR maximum value as the subcarrier signal. Corresponding optimal phase compensation value;
  • the receiving end determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value when the optimal performance index value is obtained.
  • the optimal phase compensation value corresponding to the subcarrier signal is specifically: the receiving end determines the SNR maximum value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value used when obtaining the SNR maximum value as the sub The optimum phase compensation value corresponding to the carrier signal.
  • each of the preset phase compensation values is located in the same setting interval; when the plurality of preset phase compensation values are arranged in numerical order, multiple pre- Let the difference between any two adjacent phase compensation values in the phase compensation value be the preset step size.
  • each preset phase compensation value is set in the set interval, and the preset setting of the preset phase compensation value can be avoided; at the same time, the plurality of preset phase compensation values are evenly distributed evenly within the set interval. Distribution, so that multiple optimal phase compensation values are chosen to be more accurate, The effect of dispersion compensation is better.
  • an embodiment of the present invention provides a dispersion compensation apparatus, where the apparatus includes:
  • a transceiver configured to receive indication information sent by a receiving end of the optical fiber communication system, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted;
  • a digital signal processor configured to perform phase compensation on the plurality of subcarrier signals by using a plurality of optimal phase compensation values according to a one-to-one correspondence included in the indication information received by the transceiver, to obtain a second multicarrier signal;
  • An electro-optic modulator for optically modulating a second multi-carrier signal obtained by the digital signal processor to obtain a first optical signal
  • the transceiver is further configured to send the first optical signal modulated by the electro-optic modulator to the receiving end.
  • the dispersion compensation device provided by the fifth aspect can be used to perform the method provided by the first aspect, and can be regarded as a specific implementation manner of the dispersion compensation device provided by the third aspect.
  • an embodiment of the present invention provides a dispersion compensation apparatus, where the apparatus includes:
  • a digital signal processor configured to determine a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end of the optical fiber communication system; and generate indication information, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal;
  • the transceiver is configured to send the indication information to the transmitting end.
  • the dispersion compensation device provided by the sixth aspect can be used to perform the method provided by the second aspect, and can be regarded as a specific implementation manner of the dispersion compensation device provided by the fourth aspect.
  • 1a is a schematic structural diagram of an optical fiber communication system according to an embodiment of the present invention.
  • 1b is a schematic diagram of a function of a dispersion expression and a dispersion compensation value according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a dispersion compensation method according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an IQ modulator according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a dual-drive modulator according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a signal-to-noise ratio of a first optical signal received by a receiving end after the dispersion compensation method shown in FIG. 2 and the dispersion compensation method provided by the prior art are provided according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a bit error rate of a first optical signal received by a receiving end after the dispersion compensation method shown in FIG. 2 and the dispersion compensation method provided by the prior art are provided according to an embodiment of the present disclosure;
  • FIG. 7 is a schematic diagram of signal to noise ratios of multiple subcarrier signals included in a plurality of second optical signals according to an embodiment of the present invention.
  • FIG. 8 is a schematic flowchart of performing phase compensation on a first multi-carrier signal by using a preset phase compensation value by using a cyclic process according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a detailed processing flow of a transmitting end and a receiving end when the dispersion compensation method in the embodiment of the present invention is used according to an embodiment of the present disclosure
  • FIG. 10 is a schematic structural diagram of a first dispersion compensation apparatus according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a second dispersion compensation apparatus according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a third dispersion compensation apparatus according to an embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a fourth dispersion compensation apparatus according to an embodiment of the present invention.
  • Embodiments of the invention are applied to fiber optic communication systems.
  • a schematic diagram of the structure of the fiber optic communication system can be as shown in Figure 1a.
  • a fiber optic communication system consists of a transmitting end and a receiving end.
  • the transmitting end obtains the optical signal by encoding, modulating and the like of the electrical signal, and the optical signal is transmitted to the optical fiber through the optical amplifier for transmission; the optical signal received by the receiving end from the optical fiber passes through the optical amplifier and is received by the receiving end.
  • the electrical signal is restored.
  • the electrical signal recovered by the receiving end is the electrical signal before the transmitting end encodes and modulates the processing. Thereby, the electrical signal is transmitted from the transmitting end to the receiving end through the optical fiber communication system.
  • the dispersion problem of optical signals in optical fiber links has always been a major problem that restricts the performance of optical fiber communication systems.
  • a dispersion compensation scheme is generally adopted. For example, by predicting the dispersion expression H(w), the inverse function 1/H(w) of the dispersion expression is superimposed on the signal to be transmitted at the transmitting end, and then the inverse of the Fourier transform, light modulation, etc. are performed on the transmitted signal. After that, it is transmitted to the receiving end. As shown in FIG. 1b, assuming that the dispersion expression H(w) is as shown by the dashed line in FIG.
  • the dispersion expression H(w) is inverted to obtain the inverse function of the dispersion expression, ie
  • the dispersion compensation value is 1/H(w), as shown by the solid line in Figure 1b.
  • the dispersion compensation value 1/H(w) shown by the solid line in Fig. 1b is superimposed on the signal to be transmitted to achieve dispersion compensation.
  • the above dispersion compensation method has a problem that the dispersion compensation value is inaccurate. This is because the dispersion expression is an estimated expression, and the actual parameters in the dispersion expression are difficult to obtain accurately by the prediction method, thus causing inaccuracy of the dispersion expression, which in turn leads to inaccurate dispersion compensation values. Moreover, there are many factors affecting the dispersion in the fiber link, such as the nonlinearity of the modulator and the driver, the quantization noise of each device, etc., and only the dispersion compensation is performed according to the dispersion form type of all subcarrier signals in the signal to be transmitted. Even if the dispersion expression is accurate, the dispersion compensation value is not accurate.
  • Embodiments of the present invention provide a dispersion compensation method for compensating for dispersion in a fiber-optic communication system. As shown in Figure 2, the method includes:
  • the receiving end of the optical fiber communication system determines a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end of the optical fiber communication system.
  • the embodiment of the present invention is applied to an optical fiber communication system.
  • the transmitting end refers to the transmitting end of the optical fiber communication system
  • the receiving end refers to the receiving end of the optical fiber communication system.
  • the one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end is that, for each subcarrier signal in the first multicarrier signal, there is The only one of the best phase compensation values corresponding to the The subcarrier signal is phase compensated, that is, the number of the plurality of optimal compensation values is the same as the number of the plurality of subcarrier signals.
  • the first multicarrier signal includes three subcarrier signals ⁇ 1, ⁇ 2, and ⁇ 3, and then the number of the plurality of optimal phase compensation values is also three, that is, ⁇ 1, ⁇ 2, and ⁇ 3.
  • the one-to-one correspondence between the optimal compensation value and the subcarrier signal may be that ⁇ 1 is the optimal phase compensation value for phase compensation of ⁇ 1, ⁇ 2 is the optimum phase compensation value for phase compensation of ⁇ 2, and ⁇ 3 is for ⁇ 3 The best phase compensation value for phase compensation.
  • S202 The receiving end generates indication information.
  • the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal.
  • S203 The receiving end sends the generated indication information to the transmitting end.
  • the transmitting end receives the indication information sent by the receiving end, and performs phase compensation on the plurality of subcarrier signals in the first multicarrier signal by using multiple optimal phase compensation values according to the one-to-one correspondence relationship to obtain a second multicarrier signal. .
  • the phase compensation of the plurality of subcarrier signals in the first multicarrier signal by using the plurality of optimal phase compensation values is: determining, for each subcarrier signal in the first multicarrier signal, The optimal phase compensation value corresponding to the subcarrier signal indicated in the one-to-one correspondence, and phase compensation of the subcarrier signal by using the determined optimal phase compensation value.
  • the first multicarrier signal includes three subcarrier signals ⁇ 1, ⁇ 2, and ⁇ 3
  • the three optimal phase compensation values determined by the receiving end are ⁇ 1, ⁇ 2, and ⁇ 3
  • the plurality of optimal compensation values are one by one of the plurality of subcarrier signals.
  • ⁇ 1 is the optimum phase compensation value for phase compensation of ⁇ 1
  • ⁇ 2 is the optimum phase compensation value for phase compensation of ⁇ 2
  • ⁇ 3 is the optimum phase compensation value for phase compensation of ⁇ 3. Therefore, when S204 is executed, phase compensation is performed on ⁇ 1 by ⁇ 1, phase compensation is performed on ⁇ 2 by ⁇ 2, and phase compensation is performed on ⁇ 3 by ⁇ 3.
  • the step of performing phase compensation on multiple subcarrier signals in the first multicarrier signal by using multiple optimal phase compensation values in S204 needs to be performed in the frequency domain, so if the first multicarrier signal is a time domain signal Then, the first multi-carrier signal needs to be Fourier transformed before S204, and the obtained first multi-carrier signal is a frequency domain signal, and then the plurality of sub-carriers of the transformed first multi-carrier signal The carrier signal is phase compensated.
  • S205 The transmitting end optically modulates the second multi-carrier signal to obtain a first optical signal.
  • the second multi-carrier signal may also be subjected to inverse Fourier transform.
  • Performing an inverse Fourier transform on the second multicarrier signal actually converts the second multicarrier signal in the frequency domain into a second multicarrier signal in the time domain. Converting the second multi-carrier signal in the frequency domain into the second multi-carrier signal in the time domain and then performing optical modulation is easier to implement.
  • S206 The transmitting end sends the first optical signal to the receiving end.
  • the optical modulation refers to modulating a continuous wave (CW) by a second multi-carrier signal, and outputting a first optical signal, and the output first optical signal carries source information included in the second multi-carrier signal.
  • the first optical signal can be transmitted to the receiving end through the optical fiber, so that the source information carried in the first optical signal can be transmitted to the receiving end.
  • Optical modulation is usually implemented by an optical modulator. There are two inputs to the optical modulator, one is CW, and the other is a second multi-carrier signal containing source information. Usually, the second multi-carrier signal is divided into two inputs. Light modulator.
  • the optical modulator may be an In-phase Quadrature (IQ) modulator or a dual-drive modulator. Regardless of whether the optical modulator is an IQ modulator or a dual-drive modulator, the transmitting end can adopt either a single sideband modulation method or a double sideband modulation method when optically modulating the signal.
  • IQ In-phase Quadrature
  • the transmitting end can adopt either a single sideband modulation method or a double sideband modulation method when optically modulating the signal.
  • the structure of the IQ modulator can be as shown in Figure 3.
  • the I port is used to input the CW
  • the O port is used to output the first optical signal
  • the A1 port and the A2 port are used to use the second multicarrier.
  • the signal is divided into two inputs and two modulators. These two modulators are generally Mach-Zehnder-Modulator (MZM), and the two modulators respectively modulate the two second multi-carrier signals.
  • MZM Mach-Zehnder-Modulator
  • the B1, B2, and B3 ports are used to adjust the bias point of the IQ modulator, typically B1, B2, and B3 are set at ⁇ /2, ⁇ /2, and ⁇ /2, respectively.
  • the output first optical signal is a single sideband signal; if the IQ modulator modulates the second multicarrier signal, double sideband modulation is used. In the mode, the output first optical signal is a double sideband signal.
  • single sideband letter Only one sideband of the number carries the source information in the second multi-carrier signal, and both sidebands of the double-sideband signal carry the source information in the second multi-carrier signal.
  • the structure of the dual drive modulator can be as shown in FIG.
  • the dual-drive modulator shown in FIG. 4 is used for optical modulation of the second multi-carrier signal
  • the I port is used for inputting CW
  • the O port is for outputting the first optical signal
  • the A1 port and the A2 port are used for the second most
  • the carrier signal is divided into two channels and two modulators are respectively input.
  • the two modulators are generally Phase Modulators (PM), and the two modulators respectively modulate the two second multi-carrier signals.
  • B1 and B2 are used to adjust the bias point of the dual drive modulator.
  • the dual-drive modulator it is generally ensured that the difference between B1 and B2 is ⁇ /2, and the specific values of B1 and B2 are not limited. If the dual-drive modulator modulates the second multi-carrier signal by using a single sideband modulation method, the output first optical signal is a single sideband signal; if the dual-drive modulator modulates the second multi-carrier signal, bilaterally With modulation mode, the output first optical signal is a double sideband signal.
  • the indication information sent by the receiving end to the transmitting end includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end,
  • the transmitting end performs phase compensation on the plurality of subcarrier signals in the first multicarrier signal by using a plurality of optimal phase compensation values according to the one-to-one correspondence included in the indication information.
  • the one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of sub-carrier signals in the first multi-carrier signal is performed.
  • FIG. 5 is a graph showing a signal-to-noise ratio (SNR) of a first optical signal received by a receiving end after the dispersion compensation method shown in FIG. 2 and the dispersion compensation method provided by the prior art are used. It can be seen from FIG. 5 that the SNR compensation method shown in FIG. 2 can improve the SNR of the first optical signal received by the receiving end, and the effect of compensating for the dispersion is better.
  • 6 is a first optical signal received by the receiving end after the dispersion compensation method shown in FIG. 2 and the dispersion compensation method provided by the prior art are used. The curve of the Bit Error Rate (BER). It can be seen from FIG. 6 that the BER compensation method shown in FIG. 2 can reduce the BER of the first optical signal received by the receiving end, and the effect of compensating for the dispersion is better.
  • BER Bit Error Rate
  • the receiving end determines a plurality of optimal phase compensation values, which can be implemented by the transmitting end and the receiving end by performing the following steps:
  • the transmitting end determining a plurality of preset phase compensation values; respectively performing, by using each of the plurality of preset phase compensation values, the following operation on the first multi-carrier signal: the transmitting end adopts the preset phase compensation value Phase compensation is performed on each subcarrier signal in the first multicarrier signal to obtain a third multicarrier signal, and the transmitting end optically modulates the third multicarrier signal to obtain a second optical signal, and sends the second optical signal to the receiving end. Since the first multi-carrier signal is phase-compensated by using each of the preset phase compensation values, and then the second optical signal is obtained, the number of the second optical signals sent by the transmitting end to the receiving end is Same as the preset phase compensation value.
  • the receiving end receives a plurality of second optical signals sent by the transmitting end, and calculates performance index values of the plurality of subcarrier signals included in each of the plurality of second optical signals, assuming the second optical signal
  • the number is M
  • the number of subcarrier signals included in each second optical signal is N.
  • the number of performance index values to be calculated is the product of M and N, and M and N are positive integers.
  • the receiving end respectively determines an optimal phase compensation value corresponding to each subcarrier signal in the first multicarrier signal according to the calculated performance indicator value.
  • the receiving end calculates performance index values of the plurality of subcarrier signals included in each of the plurality of second optical signals, and determines each subcarrier in the first multicarrier signal according to the calculated performance index value.
  • the optimal phase compensation value corresponding to the signal can be understood as: for any one of the first multi-carrier signals, the receiving end acquires each of the plurality of second optical signals from the calculated performance indicator value.
  • the performance index value of the subcarrier signal that is, the same performance index, the number of performance index values of the subcarrier signal obtained is the same as the number of the second optical signal; determining the subcarrier signal in each second optical signal
  • the optimal performance index value of the performance index value, and the preset phase compensation value used when obtaining the optimal performance index value is used as the optimal phase compensation value corresponding to the subcarrier signal.
  • the sub-carrier signal has three performance index values, that is, each second optical signal corresponds to a performance index value of the sub-carrier signal.
  • the receiving end obtains the optimal performance index value among the three performance index values, and the preset phase compensation value used by the corresponding second optical signal when obtaining the optimal performance index value is the optimal phase compensation of the subcarrier signal. value.
  • a preset phase compensation may be adopted. After performing the above three operations on the first multi-carrier signal, performing the above three operations on the first multi-carrier signal by using another preset phase compensation value; or using a preset phase compensation value for the first multiple When the carrier signal does not perform the above three operations, the third operation is performed on the first multicarrier signal by using another preset phase compensation value.
  • a second optical signal can be obtained after phase compensation and optical modulation of the first multicarrier signal by using ⁇ /4, and then ⁇ / is used. 2 performing phase compensation and optical modulation on the first multi-carrier signal to obtain another second optical signal, and then transmitting two second optical signals respectively.
  • the receiving end needs to determine the performance index value of the plurality of subcarrier signals included in each of the plurality of second optical signals when determining the optimal phase compensation value of each subcarrier signal.
  • the performance indicator values of the plurality of subcarrier signals included in each second optical signal include SNR and/or BER.
  • the receiving end determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value when the optimal performance index value is obtained.
  • the optimal phase compensation value corresponding to the subcarrier signal is specifically: the receiving end determines the SNR maximum value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value used as the SNR maximum value as the subcarrier signal. Corresponding optimal phase compensation value;
  • the receiving end determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation value when the optimal performance index value is obtained.
  • the optimal phase compensation value corresponding to the subcarrier signal is specifically: the receiving end determines each The SNR maximum value of the subcarrier signal in the second optical signal, and the preset phase compensation value used when obtaining the SNR maximum value is taken as the optimal phase compensation value corresponding to the subcarrier signal.
  • the performance index value of the second optical signal is not limited to the SNR and the BER, and other performance indicators that can be used to measure the performance of the second optical signal may also be used as the multiple optimal phase compensation values in the embodiment of the present invention. Basis.
  • the performance index of the second optical signal is SNR
  • the plurality of preset phase compensation values are ⁇ /5, 2 ⁇ /5, 3 ⁇ /5, 4 ⁇ /5, and ⁇ , respectively, in a fiber-optic communication system
  • the SNRs of the plurality of subcarrier signals included in the five second optical signals calculated by the receiving end may be as shown in FIG. 7.
  • the SNRs of the plurality of subcarrier signals included in the second optical signal when different preset phase compensation values are used are distinguished by different line types, and the optimal compensation value curve represents the plurality of sub-inclusions included by the receiving end according to the five second optical signals.
  • the specific example shows how the receiving end determines the optimal phase compensation value of one of the first multi-carrier signals. Taking the performance index value SNR of the five second optical signals shown in FIG. 7 as an example, it is assumed that the receiving end determines the optimum phase compensation value of the subcarrier signal having a frequency of 20 GHz.
  • the receiving end can obtain the SNR of the subcarrier signal on each of the five second optical signals; since the subcarrier signal for the second optical signal is When the value of SNR is large, the performance index value is superior, so the receiving end determines the largest SNR among the five SNRs, that is, the SNR of the subcarrier signal in the second optical signal represented by the square line type; Multi-carrier signal phase compensation
  • the preset phase compensation value used to obtain the maximum SNR is used as the optimum phase compensation value of the sub-carrier signal, that is, the preset phase compensation used for the SNR of the sub-carrier signal represented by the block line type.
  • the value is 2 ⁇ /5.
  • each of the preset phase compensation values may be set in the same setting interval.
  • the setting interval may be [0, ⁇ ] or [0, 2 ⁇ ].
  • Limiting the range of values of the plurality of preset phase compensation values can avoid repeated setting of the preset phase compensation values.
  • the two preset phase compensation values are ⁇ /3 and 7 ⁇ /3, respectively, and the two preset phase compensation values are respectively The effect of phase compensation on a subcarrier signal is the same, so the two preset phases
  • the bit offset value is the preset phase offset value that is set repeatedly.
  • the plurality of optimal phase compensation values are based on the phase compensation test of the first multi-carrier signal by using a plurality of preset phase compensation values at the transmitting end, respectively, by the receiving end Determining according to performance index values of the plurality of subcarrier signals included in each of the second optical signals.
  • the receiving end determines the performance index value of the plurality of subcarrier signals included in each of the second optical signals, and thus may perform the phase compensated first multicarrier signal (ie, the second multicarrier).
  • the performance index value of the signal is better, and the performance index value of the first optical signal obtained by the second multi-carrier signal is also better.
  • the process can be implemented by a cyclic process. Assuming that the setting interval is [0, ⁇ ] and the preset step size is ⁇ /N, the process of the loop operation can be as shown in FIG. In FIG. 8, when a plurality of preset phase compensation values are arranged in numerical order, the first preset phase compensation value set by the transmitting end is 0, and the second preset phase compensation value is ⁇ /N, The three preset phase compensation values are 2 ⁇ /N... and so on. In FIG.
  • the dispersion compensation provided by the embodiment of the present invention can be adjusted by setting the value of N.
  • the dispersion compensation accuracy of the compensation method the larger the value of N, the smaller the preset step size, and the greater the number of preset phase compensation values, the higher the accuracy of dispersion compensation.
  • the dispersion compensation method shown in FIG. 2 can more accurately compensate the dispersion in the optical fiber communication system than the dispersion compensation method in the prior art.
  • FIG. 9 provides a detailed processing flow of the transmitting end and the receiving end when the dispersion compensation method in the embodiment of the present invention is adopted.
  • the process flow shown in FIG. 9 can be regarded as a specific implementation of the dispersion compensation method shown in FIG. 2.
  • the multi-channel parallel time domain signal obtained by serial-to-parallel conversion is subjected to IFFT.
  • Obtaining a multi-channel parallel frequency domain signal that is, the first multi-carrier signal in the embodiment of the present invention; then adding the first multi-carrier signal to a Cyclic Prefix (CP) and outputting to the sub-carrier signal phase compensation module (Phase) Comp.For subcarriers); the subcarrier signal phase compensation module uses the dispersion compensation method shown in FIG.
  • the signal is subjected to parallel-to-serial conversion (P/S) to obtain a serial frequency domain signal, and the serial frequency domain signal is divided into two outputs, and each serial frequency domain signal is subjected to a digital-to-analog converter (DAC).
  • P/S parallel-to-serial conversion
  • DAC digital-to-analog converter
  • the digital-to-analog conversion, the amplifier performs amplification, and the attenuator performs attenuation processing, and then inputs to the dual-drive modulator. After the double-drive modulator double-bands the second multi-carrier signal, the obtained first optical signal is output to the reception.
  • the binary sequence transmitted by the transmitting end can be restored. Since the subcarrier signal phase compensation module in FIG. 9 adopts the dispersion compensation method shown in FIG. 2, dispersion compensation can be performed more accurately on the optical fiber communication system than in the prior art.
  • the receiving end may set a subcarrier signal SNR calculation module (SNR Cal. For subcarriers), and the module may calculate multiple subcarriers included in each second optical signal after receiving the plurality of second optical signals sent by the transmitting end.
  • SNR subcarrier signal
  • the SNR of the signal; the receiving end may further set a BER calculation module (BER Calculation), the module may calculate the BER of the plurality of subcarrier signals included in each second optical signal after receiving the plurality of second optical signals sent by the transmitting end .
  • the receiving end may determine the first multiple according to the calculated value of the SNR and/or the value of the BER of the plurality of subcarrier signals included in each second optical signal.
  • the optimal phase compensation value corresponding to each subcarrier signal in the carrier signal, and the calculated plurality of optimal phase compensation values may be respectively used for the subcarrier signal phase compensation module of the transmitting end and the plurality of subcarrier signals of the first multicarrier signal Perform phase compensation.
  • Embodiments of the present invention provide a dispersion compensation apparatus that can be used to perform operations performed by a transmitting end in the method shown in FIG. 2.
  • the dispersion compensation device 1000 includes:
  • the receiving module 1001 is configured to receive indication information sent by the receiving end of the optical fiber communication system, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted;
  • the phase compensation module 1002 is configured to perform phase compensation on the plurality of subcarrier signals by using a plurality of optimal phase compensation values according to the one-to-one correspondence included in the indication information received by the receiving module 1001, to obtain a second multicarrier signal;
  • the optical modulation module 1003 is configured to perform optical modulation on the second multi-carrier signal compensated by the phase compensation module 1002 to obtain a first optical signal.
  • the sending module 1004 is configured to send the first optical signal modulated by the optical modulation module 1003 to the receiving end.
  • the dispersion compensation apparatus 1000 further includes: a determining module, configured to determine a plurality of preset phase compensation values before the receiving module 1001 receives the indication information sent by the receiving end; the phase compensation module 1002 is further configured to adopt multiple Each preset phase compensation value of the preset phase compensation value phase compensates each subcarrier signal in the first multicarrier signal to obtain a third multicarrier signal; the optical modulation module 1003 is further configured to use the third multicarrier The signal is optically modulated to obtain a second optical signal, and the second optical signal is used by the receiving end to determine a one-to-one correspondence according to performance index values of the plurality of subcarrier signals included in the second optical signal; the transmitting module 1004 is further configured to use the second The optical signal is sent to the receiving end.
  • a determining module configured to determine a plurality of preset phase compensation values before the receiving module 1001 receives the indication information sent by the receiving end
  • the phase compensation module 1002 is further configured to adopt multiple Each preset phase compensation value of the preset phase
  • the performance indicator value of the multiple subcarrier signals included in the second optical signal includes a signal to noise ratio SNR and/or a bit error rate BER; and for any one of the first multicarrier signals, the performance indicator value includes an SNR.
  • the preset phase compensation value used when the SNR of the plurality of second optical signals is maximum is the optimal phase compensation value corresponding to the subcarrier signal; when the performance index value includes the BER, the plurality of second optical signal neutrons
  • the preset phase compensation value used when the BER of the carrier signal is minimum is The optimum phase compensation value corresponding to the carrier signal.
  • each of the preset phase compensation values is located in the same setting interval; when the plurality of preset phase compensation values are arranged in an increasing order of values, the plurality of preset phase compensation values The difference between any two adjacent preset phase compensation values is a preset step size.
  • the dispersion compensation apparatus 1000 further includes: an inverse Fourier transform module, configured to perform inverse Fourier transform on the second multicarrier signal before the optical modulation module 1003 optically modulates the second multicarrier signal.
  • an inverse Fourier transform module configured to perform inverse Fourier transform on the second multicarrier signal before the optical modulation module 1003 optically modulates the second multicarrier signal.
  • dispersion compensation apparatus 1000 provided by the embodiment of the present invention can be used to perform the operations performed by the transmitting end in the dispersion compensation method shown in FIG. 2, and the implementation manner not explained and described in detail by the dispersion compensation apparatus 1000 can be referred to FIG. A related description in the dispersion compensation method shown.
  • each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • an embodiment of the present invention further provides a dispersion compensation apparatus.
  • the dispersion compensating apparatus 1100 can perform the method provided by the embodiment corresponding to FIG. 2, which can be the same as the dispersion compensating apparatus 1000 shown in FIG.
  • the dispersion compensation device 1100 includes:
  • the transceiver 1101 is configured to receive indication information sent by the receiving end of the optical fiber communication system, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted;
  • the digital signal processor 1102 is configured to perform phase compensation on the plurality of subcarrier signals by using a plurality of optimal phase compensation values according to a one-to-one correspondence included in the indication information received by the transceiver 1101, to obtain a second multicarrier signal;
  • An electro-optic modulator 1103, configured to perform optical modulation on the second multi-carrier signal obtained by the digital signal processor to obtain a first optical signal
  • the transceiver 1101 is further configured to send the first optical signal modulated by the electro-optic modulator to the receiving end.
  • the dispersion compensation device 1100 may be the same device as the dispersion compensation device 1000 shown in FIG.
  • the transceiver 1101 can be used to perform operations performed by the receiving module 1001 and the transmitting module 1004 in the dispersion compensation device 1000
  • the digital signal processor 1102 can be used to perform operations performed by the phase compensation module 1002 in the dispersion compensation device 1000, the electro-optic modulator 1103 It can be used to perform the operations performed by the light modulation module 1003 in the dispersion compensation device 1000.
  • the digital signal processor 1102 can be used to perform operations performed by the determination module and the inverse Fourier transform module in the dispersion compensation device 1000. Implementations not specifically explained and described in the dispersion compensation device 1100 can be referred to the relevant description in the dispersion compensation device 1100.
  • the embodiment of the invention provides a dispersion compensation device, which can be used to perform the operations performed by the receiving end in the method shown in FIG. 2.
  • the dispersion compensation device 1200 includes:
  • the determining module 1201 is configured to determine a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end of the optical fiber communication system;
  • the indication information generating module 1202 is configured to generate indication information, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal;
  • the sending module 1203 is configured to send the indication information to the transmitting end.
  • the dispersion compensation device 1200 further includes: a receiving module, configured to receive, by the determining module 1201, a plurality of second optical signals sent by the transmitting end, where the plurality of second optical signals are respectively sent by the transmitting end, before the determining module 1201 determines the one-to-one correspondence And obtaining, by the plurality of second multi-carrier signals, the plurality of second multi-carrier signals, wherein each of the plurality of preset phase compensation values is used by the transmitting end, respectively, for each of the first multi-carrier signals
  • the determining module 1201 is configured to: calculate a performance index value of the plurality of sub-carrier signals included in each of the plurality of second optical signals; And determining, according to the calculated performance indicator value, an optimal phase compensation value corresponding to each subcarrier signal in the first multicarrier signal.
  • the determining module 1201 is configured to: determine, according to the calculated performance indicator value, an optimal phase compensation value corresponding to each subcarrier signal in the first multicarrier signal, specifically: for any of the first multicarrier signals a subcarrier signal, obtaining a plurality of second lights from the calculated performance indicator values a performance index value of a subcarrier signal of each second optical signal in the signal; determining an optimal performance index value of a performance index value of the subcarrier signal in each second optical signal, and obtaining an optimal performance index value
  • the preset phase compensation value is adopted as the optimal phase compensation value corresponding to the subcarrier signal.
  • the performance indicator value of the multiple subcarrier signals included in each second optical signal includes a signal to noise ratio SNR and/or a bit error rate BER;
  • the determining module 1201 determines the optimal performance index value among the performance index values of the subcarrier signals in each second optical signal, and uses the preset phase compensation when obtaining the optimal performance index value.
  • the value is used as the optimal phase compensation value corresponding to the subcarrier signal, and is specifically used to: determine the SNR maximum value of the subcarrier signal in each second optical signal, and use the preset phase compensation value used as the SNR maximum value as a sub- The optimal phase compensation value corresponding to the carrier signal;
  • the determining module 1201 determines the optimal performance index value of the performance index value of the subcarrier signal in each second optical signal, and uses the preset phase compensation when obtaining the optimal performance index value.
  • the value is used as the optimal phase compensation value corresponding to the subcarrier signal, and is specifically used to: determine the SNR maximum value of the subcarrier signal in each second optical signal, and use the preset phase compensation value used as the SNR maximum value as a sub- The optimum phase compensation value corresponding to the carrier signal.
  • each of the preset phase compensation values is located in the same setting interval; when the plurality of preset phase compensation values are arranged in an increasing order of values, the plurality of preset phase compensation values The difference between any two adjacent preset phase compensation values is a preset step size.
  • dispersion compensation apparatus 1200 provided by the embodiment of the present invention can be used to perform the operations performed by the receiving end in the dispersion compensation method shown in FIG. 2, and the implementation manner not explained and described in detail by the dispersion compensation apparatus 1200 can be referred to FIG. A related description in the dispersion compensation method.
  • an embodiment of the present invention further provides a dispersion compensation apparatus.
  • the dispersion compensation device 1300 can perform the method provided by the embodiment corresponding to FIG. 2, which can be the same as the dispersion compensation device 1200 shown in FIG.
  • the dispersion compensation device 1300 includes:
  • the digital signal processor 1301 is configured to determine a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal to be transmitted by the transmitting end of the optical fiber communication system; Generating indication information, where the indication information includes a one-to-one correspondence between the plurality of optimal phase compensation values and the plurality of subcarrier signals in the first multicarrier signal;
  • the transceiver 1302 is configured to send the indication information to the transmitting end.
  • the dispersion compensation device 1300 may be the same device as the dispersion compensation device 1200 illustrated in FIG.
  • the transceiver 1302 can be used to perform operations performed by the transmitting module 1203 and the receiving module in the dispersion compensating device 1200
  • the digital signal processor 1301 can be used to perform operations performed by the determining module 1201 and the indication information generating module 1202 in the dispersion compensating device 1200. Implementations not specifically explained and described in the dispersion compensation device 1300 can be referred to the relevant description in the dispersion compensation device 1200.
  • embodiments of the present invention provide a dispersion compensation method and apparatus to more accurately compensate dispersion in a fiber-optic communication system.
  • 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 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.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, 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 device is implemented in a flow chart or Multiple processes and/or block diagrams The functions specified in one or more boxes.
  • 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

一种色散补偿方法及装置，用以补偿光纤通信***中的色散。方法包括：光纤通信***的接收端确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；接收端生成指示信息，该指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；接收端将生成的指示信息发送给发射端；发射端接收接收端发送的指示信息，并按照该一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿，得到第二多载波信号；发射端对第二多载波信号进行光调制，得到第一光信号；发射端将该第一光信号发送给接收端。

Description

一种色散补偿方法及装置 技术领域
本发明涉及光纤通信技术领域，尤其涉及一种色散补偿方法及装置。
背景技术
随着移动互联网技术的不断发展，光纤通信***因其高速率、大容量的特点被广泛应用于信号传输过程中。光纤链路中光信号的色散问题一直是制约光纤通信***性能的主要问题。
为解决光纤链路中光信号的色散问题，现有技术中发射端根据预估的色散值对待发射信号进行色散补偿，并向接收端传输色散补偿后的信号，以降低接收端接收到的光信号的色散程度。例如：假设色散表达式为H(w)，发射端信号为Txwave，在进行色散补偿时，通常将色散表达式的反函数1/H(w)叠加在待发射信号上，那么加入色散补偿的待发射信号为：Txwave_comp＝IFFT(FFT(Txwave)/H(w))，其中FFT表示快速傅里叶变换(Fast Fourier Transformation，FFT)，IFFT表示快速傅里叶逆变换(Inverse Fast Fourier Transform，IFFT)。
现有的对光纤链路中的色散进行色散补偿的技术方案中，由于发射端对待发射信号进行色散补偿的色散值是预估的，光纤链路的类型、长度和相位噪声等因素都会对实际应该进行色散补偿的色散值产生影响，因而在上述多种因素未知的前提下仅通过预估的色散值对待发射信号进行色散补偿，无法准确地补偿光纤链路中的色散。
综上，现有的对光纤链路中的色散进行色散补偿的技术方案，存在色散补偿值不准确的问题。
发明内容
有鉴于此，提供一种色散补偿方法及装置，用以实现补偿光纤通信*** 中的色散。
第一方面，本发明实施例提供一种色散补偿方法，该方法包括：
光纤通信***的发射端接收光纤通信***的接收端发送的指示信息，该指示信息包括多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；发射端按照该一一对应关系，采用多个最佳相位补偿值对多个子载波信号进行相位补偿，得到第二多载波信号；发射端对第二多载波信号进行光调制，得到第一光信号，并将第一光信号发送给接收端。
在上述第一方面中，多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系是指，对于第一多载波信号中的每个子载波信号而言，有唯一一个最佳相位补偿值与该子载波信号对应，该最佳相位补偿值用于对该子载波信号进行相位补偿，多个最佳补偿值的个数与多个子载波信号的个数相同。
采用上述方案，接收端向发射端发送的指示信息包括多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系，发射端按照指示信息包括的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿。由于发射端在对第一多载波信号进行色散补偿时，是按照多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行色散补偿的，与现有技术中用色散表达式对发射端的待发射信号进行补偿相比，第一方面所提供的方法是针对第一多载波信号中的每个子载波信号分别进行补偿的，因而色散补偿更为准确。
在一种可能的设计中，发射端接收接收端发送的指示信息之前，还可以执行如下操作，从而使得接收端可以确定上述一一对应关系：
发射端确定多个预设相位补偿值；发射端分别采用多个预设相位补偿值中的每个预设相位补偿值对第一多载波信号执行如下操作：采用预设相位补偿值对第一多载波信号中的每个子载波信号进行相位补偿，得到第三多载波 信号；对第三多载波信号进行光调制，得到第二光信号，并将第二光信号发送给接收端，第二光信号用于接收端根据第二光信号包含的多个子载波信号的性能指标值确定所述一一对应关系。
其中，第二光信号包含的多个子载波信号的性能指标值包括但不限于信号噪声比SNR和/或误码率BER。
针对第一多载波信号中的任意一个子载波信号，最佳相位补偿值按如下方式设置：
性能指标值包括SNR时，多个第二光信号中子载波信号的SNR最大时采用的预设相位补偿值为该子载波信号对应的最佳相位补偿值；
性能指标值包括BER时，多个第二光信号中子载波信号的BER最小时采用的预设相位补偿值为该子载波信号对应的最佳相位补偿值。
采用上述方案，多个最佳相位补偿值是在发射端分别采用多个预设相位补偿值对第一多载波信号进行相位补偿测试的基础上，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的。由于多个最佳相位补偿值是在将光纤通信***中影响色散补偿的因素(比如，传输距离、发射端中各器件的非线性因素和量化噪声、光纤链路中的噪声等)均纳入考虑后，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的，因而可以使得进行相位补偿后的第一多载波信号(即第二多载波信号)的性能指标值更优，由第二多载波信号进行光调制后得到的第一光信号的性能指标值也更优。
在一种可能的设计中，多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
采用上述方案，将每个预设相位补偿值设置在设定区间内，可以避免预设相位补偿值的重复设置；同时，设置的多个预设相位补偿值均匀分布在上述设定区间内均匀分布，从而使得多个最佳相位补偿值选择得更为准确，使得色散补偿的效果更好。
在一种可能的设计中，发射端对第二多载波信号进行光调制之前，还可以对第二多载波信号进行傅里叶逆变换。从而将频域的第二多载波信号转换为时域的第二多载波信号。将频域上的第二多载波信号转换为时域上的第二多载波信号后再进行光调制，更易于工程实现。
第二方面，本发明实施例提供一种色散补偿方法，该包括：光纤通信***的接收端确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；接收端生成指示信息，指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；接收端将指示信息发送给发射端。
其中，多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系是指对于第一多载波信号中的每个子载波信号而言，有唯一一个最佳相位补偿值与该子载波信号对应，该最佳相位补偿值用于对该子载波信号进行相位补偿，即多个最佳补偿值的个数与多个子载波信号的个数相同。
采用上述方案，接收端向发射端发送的指示信息包括多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系，发射端按照指示信息包括的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿。由于发射端在对第一多载波信号进行色散补偿时，是按照多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行色散补偿的，与现有技术中用色散表达式对发射端的待发射信号进行补偿相比，第二方面所提供的方法是针对第一多载波信号中的每个子载波信号分别进行补偿的，因而色散补偿更为准确。
在一种可能的设计中，接收端确定一一对应关系之前，还可以执行如下步骤来确定上述一一对应关系：接收端接收发射端发送的多个第二光信号，多个第二光信号为发射端分别对多个第二多载波信号进行光调制得到的，多个第二多载波信号为发射端采用多个预设相位补偿值中的每个预设相位补偿 值分别对第一多载波信号中的每个子载波信号进行相位补偿得到的；接收端计算多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值；接收端根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值。
具体实现时，接收端根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值，可通过如下方式实现：
针对第一多载波信号中的任意一个子载波信号：
接收端从计算的性能指标值中获取多个第二光信号中每个第二光信号的子载波信号的性能指标值；接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值。
采用上述方案，多个最佳相位补偿值是在发射端分别采用多个预设相位补偿值对第一多载波信号进行相位补偿测试的基础上，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的。由于多个最佳相位补偿值是在将光纤通信***中影响色散补偿的因素(比如，传输距离、发射端中各器件的非线性因素和量化噪声、光纤链路中的噪声等)均纳入考虑后，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的，因而可以使得进行相位补偿后的第一多载波信号(即第二多载波信号)的性能指标值更优，由第二多载波信号进行光调制后得到的第一光信号的性能指标值也更优。
在一种可能的设计中，每个第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
性能指标值包括SNR时，接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值，具体为：接收端确定每个第二光信号中该子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为该子载波信号对应的最佳相位补偿值；
性能指标值包括BER时，接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值，具体为：接收端确定每个第二光信号中该子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为该子载波信号对应的最佳相位补偿值。
在一种可能的设计中，多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
采用上述方案，将每个预设相位补偿值设置在设定区间内，可以避免预设相位补偿值的重复设置；同时，设置的多个预设相位补偿值均匀分布在上述设定区间内均匀分布，从而使得多个最佳相位补偿值选择得更为准确，使得色散补偿的效果更好。
第三方面，本发明实施例提供一种色散补偿装置，该装置包括：
接收模块，用于接收光纤通信***的接收端发送的指示信息，指示信息包括多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信号的一一对应关系；
相位补偿模块，用于按照接收模块接收的指示信息包括的一一对应关系，采用多个最佳相位补偿值对多个子载波信号进行相位补偿，得到第二多载波信号；
光调制模块，用于对相位补偿模块补偿得到的第二多载波信号进行光调制，得到第一光信号；
发送模块，用于将光调制模块调制得到的第一光信号发送给接收端。
其中，多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系是指对于第一多载波信号中的每个子载波信号而言，有唯一一个最佳相位补偿值与该子载波信号对应，该最佳相位补偿值用于对该子载波信号进行相位补偿，多个最佳补偿值的个数与多个子载波信号的个数相同。
采用上述方案，接收端向接收模块发送的指示信息包括多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系，相位补偿模块按照指示信息包括的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿。由于相位补偿模块在对第一多载波信号进行色散补偿时，是按照多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行色散补偿的，与现有技术中用色散表达式对发射端的待发射信号进行补偿相比，第三方面所提供的装置是针对第一多载波信号中的每个子载波信号分别进行补偿的，因而色散补偿更为准确。
在一种可能的设计中，该装置还包括：确定模块，用于在接收模块接收接收端发送的指示信息之前，确定多个预设相位补偿值；相位补偿模块，还用于分别采用多个预设相位补偿值中的每个预设相位补偿值对第一多载波信号中的每个子载波信号进行相位补偿，得到第三多载波信号；光调制模块，还用于对第三多载波信号进行光调制，得到第二光信号，第二光信号用于接收端根据第二光信号包含的多个子载波信号的性能指标值确定所述一一对应关系；发送模块，还用于将第二光信号发送给接收端。
其中，第二光信号包含的多个子载波信号的性能指标值包括但不限于信号噪声比SNR和/或误码率BER。
针对第一多载波信号中的任意一个子载波信号，最佳相位补偿值按如下方式设置：
性能指标值包括SNR时，多个第二光信号中子载波信号的SNR最大时采用的预设相位补偿值为该子载波信号对应的最佳相位补偿值；
性能指标值包括BER时，多个第二光信号中子载波信号的BER最小时采用的预设相位补偿值为该子载波信号对应的最佳相位补偿值。
采用上述方案，多个最佳相位补偿值是在相位补偿模块分别采用多个预设相位补偿值对第一多载波信号进行相位补偿测试的基础上，由接收端根据 第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的。由于多个最佳相位补偿值是在将光纤通信***中影响色散补偿的因素(比如，传输距离、发射端中各器件的非线性因素和量化噪声、光纤链路中的噪声等)均纳入考虑后，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的，因而可以使得进行相位补偿后的第一多载波信号(即第二多载波信号)的性能指标值更优，由第二多载波信号进行光调制后得到的第一光信号的性能指标值也更优。
在一种可能的设计中，多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
采用上述方案，将每个预设相位补偿值设置在设定区间内，可以避免预设相位补偿值的重复设置；同时，设置的多个预设相位补偿值均匀分布在上述设定区间内均匀分布，从而使得多个最佳相位补偿值选择得更为准确，使得色散补偿的效果更好。
在一种可能的设计中，上述第三方面所提供的色散补偿装置还包括：傅里叶逆变换模块，用于在光调制模块对第二多载波信号进行光调制之前，对第二多载波信号进行傅里叶逆变换。从而将频域的第二多载波信号转换为时域的第二多载波信号。将频域上的第二多载波信号转换为时域上的第二多载波信号后再进行光调制，更易于工程实现。
第四方面，本发明实施例提供一种色散补偿装置，该装置包括：
确定模块，用于确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；
指示信息生成模块，用于生成指示信息，指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；
发送模块，用于将指示信息发送给发射端。
其中，多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信号的一一对应关系是指对于第一多载波信号中的每个子载波信号而言，有 唯一一个最佳相位补偿值与该子载波信号对应，该最佳相位补偿值用于对该子载波信号进行相位补偿，多个最佳补偿值的个数与多个子载波信号的个数相同。
采用上述方案，发送模块端向发射端发送的指示信息包括多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系，发射端按照指示信息包括的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿。由于发射端在对第一多载波信号进行色散补偿时，是按照多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行色散补偿的，与现有技术中用色散表达式对发射端的待发射信号进行补偿相比，第四方面所提供的装置是针对第一多载波信号中的多个子载波信号分别进行补偿的，因而色散补偿更为准确。
在一种可能的设计中，该色散补偿装置还包括：接收模块，用于在确定模块确定一一对应关系之前，接收发射端发送的多个第二光信号，多个第二光信号为发射端分别对多个第二多载波信号进行光调制得到的，多个第二多载波信号为发射端采用多个预设相位补偿值中的每个预设相位补偿值分别对第一多载波信号中的每个子载波信号进行相位补偿得到的；
确定模块在确定一一对应关系时，具体用于：计算多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值；根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值。
具体实现时，确定模块根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值，可通过如下方式实现：
针对第一多载波信号中的任意一个子载波信号，从计算的性能指标值中获取多个第二光信号中每个第二光信号的子载波信号的性能指标值；确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值。
采用上述方案，多个最佳相位补偿值是在发射端分别采用多个预设相位补偿值对第一多载波信号进行相位补偿测试的基础上，由确定模块根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的。由于多个最佳相位补偿值是在将光纤通信***中影响色散补偿的因素(比如，传输距离、发射端中各器件的非线性因素和量化噪声、光纤链路中的噪声等)均纳入考虑后，由确定模块根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的，因而可以使得进行相位补偿后的第一多载波信号(即第二多载波信号)的性能指标值更优，由第二多载波信号进行光调制后得到的第一光信号的性能指标值也更优。
在一种可能的设计中，每个第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
性能指标值包括SNR时，接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值，具体为：接收端确定每个第二光信号中子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值；
性能指标值包括BER时，接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值，具体为：接收端确定每个第二光信号中该子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为该子载波信号对应的最佳相位补偿值。
在一种可能的设计中，多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
采用上述方案，将每个预设相位补偿值设置在设定区间内，可以避免预设相位补偿值的重复设置；同时，设置的多个预设相位补偿值均匀分布在上述设定区间内均匀分布，从而使得多个最佳相位补偿值选择得更为准确，使 得色散补偿的效果更好。
第五方面，本发明实施例提供一种色散补偿装置，该装置包括：
收发机，用于接收光纤通信***的接收端发送的指示信息，指示信息包括多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信号的一一对应关系；
数字信号处理器，用于按照收发机接收的指示信息包括的一一对应关系，采用多个最佳相位补偿值对多个子载波信号进行相位补偿，得到第二多载波信号；
电光调制器，用于对数字信号处理器补偿得到的第二多载波信号进行光调制，得到第一光信号；
收发机，还用于将电光调制器调制得到的第一光信号发送给接收端。
其中，第五方面提供的色散补偿装置可用于执行上述第一方面所提供的方法，可视为第三方面提供的色散补偿装置的一种具体实现方式。
第六方面，本发明实施例提供一种色散补偿装置，该装置包括：
数字信号处理器，用于确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；以及生成指示信息，指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；
收发机，用于将指示信息发送给发射端。
其中，第六方面提供的色散补偿装置可用于执行上述第二方面所提供的方法，可视为第四方面提供的色散补偿装置的一种具体实现方式。
附图说明
图1a为本发明实施例提供的光纤通信***的结构示意图；
图1b为本发明实施例提供的色散表达式和色散补偿值的函数的示意图；
图2为本发明实施例提供的色散补偿方法的流程示意图；
图3为本发明实施例提供的IQ调制器的结构示意图；
图4为本发明实施例提供的双驱动调制器的结构示意图；
图5为本发明实施例提供的采用图2所示色散补偿方法和采用现有技术提供的色散补偿方法后，接收端接收到的第一光信号的信号噪声比的示意图；
图6为本发明实施例提供的采用图2所示色散补偿方法和采用现有技术提供的色散补偿方法后，接收端接收到的第一光信号的误码率的示意图；
图7为本发明实施例提供的多个第二光信号包含的多个子载波信号的信号噪声比的示意图；
图8为本发明实施例提供的采用循环过程实现采用多个预设相位补偿值对第一多载波信号进行相位补偿的流程示意图；
图9为本发明实施例提供的采用本发明实施例中的色散补偿方法时，发射端和接收端的详细处理流程的示意图；
图10为本发明实施例提供的第一种色散补偿装置的结构示意图；
图11为本发明实施例提供的第二种色散补偿装置的结构示意图；
图12为本发明实施例提供的第三种色散补偿装置的结构示意图；
图13为本发明实施例提供的第四种色散补偿装置的结构示意图。
具体实施方式
为了更好地理解本发明的上述目的、方案和优势，下文提供了详细描述。该详细描述通过使用框图、流程图等附图和/或示例，阐明了装置和/或方法的各种实施方式。在这些框图、流程图和/或示例中，包含一个或多个功能和/或操作。本领域技术人员将理解到：这些框图、流程图或示例内的各个功能和/或操作，能够通过各种各样的硬件、软件、固件单独或共同实施，或者通过硬件、软件和固件的任意组合实施。
本发明实施例应用于光纤通信***。光纤通信***的结构示意图可如图1a所示。在图1a中，光纤通信***由发射端和接收端组成。发射端通过对电信号进行编码、调制等处理后得到光信号，光信号经过光放大器后发送至光纤中进行传输；接收端从光纤中接收到的光信号经过光放大器后由接收端进 行解调、解码等处理后，还原出电信号。接收端还原出的电信号即为发射端进行编码、调制处理前的电信号。从而，通过光纤通信***实现了电信号从发射端传输到接收端。
在光纤通信领域，光纤链路中光信号的色散问题一直是制约光纤通信***性能的主要问题。为解决光纤链路中的色散问题，一般采用色散补偿的方案。比如，通过预估色散表达式H(w)，在发射端将色散表达式的反函数1/H(w)叠加在待发射信号，再对待发射信号进行傅里叶逆变换、光调制等处理后，传输至接收端。如图1b所示，假设色散表达式H(w)如图1b中的虚线所示，那么在进行色散补偿时，对色散表达式H(w)取反，得到色散表达式的反函数，即色散补偿值1/H(w)，如图1b中的实线所示。将图1b中的实线所示的色散补偿值1/H(w)叠加在待发射信号实现色散补偿。
采用上述色散补偿方法存在色散补偿值不准确的问题。这是因为，色散表达式是一个预估的表达式，色散表达式中的实际参数难以通过预估的方式准确获得，因而造成色散表达式的不准确，进而导致色散补偿值不准确。而且，对光纤链路中的色散的造成影响的因素有很多，比如调制器和驱动器的非线性、各器件的量化噪声等，仅仅根据色散表单式对待发射信号中的所有子载波信号进行色散补偿，即使色散表达式是准确的，色散补偿值也是不准确的。
本发明实施例提供一种色散补偿方法，用以实现补偿光纤通信***中的色散。如图2所示，该方法包括：
S201：光纤通信***的接收端确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系。
本发明实施例应用于光纤通信***，本发明实施例中的发射端是指光纤通信***的发射端，接收端是指光纤通信***的接收端。
S201中，多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系是指对于第一多载波信号中的每个子载波信号而言，有唯一一个最佳相位补偿值与之相对应，该最佳相位补偿值用于对该 子载波信号进行相位补偿，即多个最佳补偿值的个数与多个子载波信号的个数相同。比如，第一多载波信号包括三个子载波信号λ1、λ2和λ3，那么，多个最佳相位补偿值的数量也为三个，即θ1、θ2和θ3。例如，最佳补偿值与子载波信号的一一对应关系可以是，θ1是对λ1进行相位补偿的最佳相位补偿值，θ2是对λ2进行相位补偿的最佳相位补偿值，θ3是对λ3进行相位补偿的最佳相位补偿值。
S202：接收端生成指示信息。
其中，该指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系。
S203：接收端将生成的指示信息发送给发射端。
S204：发射端接收接收端发送的指示信息，并按照该一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿，得到第二多载波信号。
其中，按照该一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿的含义是：针对第一多载波信号中的每个子载波信号，确定该一一对应关系中指示的、与该子载波信号对应的最佳相位补偿值，并采用确定的该最佳相位补偿值对该子载波信号进行相位补偿。假设第一多载波信号包括三个子载波信号λ1、λ2和λ3，接收端确定的三个最佳相位补偿值为θ1、θ2和θ3，且多个最佳补偿值与多个子载波信号的一一对应关系是：θ1是对λ1进行相位补偿的最佳相位补偿值，θ2是对λ2进行相位补偿的最佳相位补偿值，θ3是对λ3进行相位补偿的最佳相位补偿值。因而在执行S204时，采用θ1对λ1进行相位补偿，θ2对λ2进行相位补偿，θ3对λ3进行相位补偿。
需要说明的是，S204中采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿这一步骤需要在频域执行，因而若第一多载波信号是时域信号，则需要在S204之前对第一多载波信号进行傅里叶变换，得到的第一多载波信号是频域信号，再对变换后的第一多载波信号中的多个子 载波信号进行相位补偿。
S205：发射端对第二多载波信号进行光调制，得到第一光信号。
可选地，发射端在S205中对第二多载波信号进行光调制之前，还可以对第二多载波信号进行傅里叶逆变换。
对第二多载波信号进行傅里叶逆变换，实际是将频域的第二多载波信号转换为时域的第二多载波信号。将频域上的第二多载波信号转换为时域上的第二多载波信号后再进行光调制，更易于工程实现。
S206：发射端将第一光信号发送给接收端。
其中，光调制是指通过第二多载波信号对连续波光源(Continuous Wave，CW)进行调制，输出第一光信号，输出的第一光信号承载了第二多载波信号中包含的信源信息。第一光信号可通过光纤传输至接收端，因而可以实现将第一光信号中承载的信源信息传输至接收端。光调制通常通过光调制器实现，光调制器的输入有两个，一个是CW，另一个是包含有信源信息的第二多载波信号，通常第二多载波信号会分为两路输入至光调制器。
本发明实施例中，光调制器可以是同相正交(In-phase Quadrature，IQ)调制器，也可以是双驱动调制器。无论光调制器是IQ调制器还是双驱动调制器，发射端在对信号进行光调制时既可采用单边带调制方式，也可采用双边带调制方式。
IQ调制器的结构可如图3所示。当图3所示的IQ调制器用于对第二多载波信号进行光调制时，I端口用于输入CW，O端口用于输出第一光信号，A1端口和A2端口用于将第二多载波信号分为两路输入两个调制器，这两个调制器一般均为马赫曾德尔调制器(Mach-Zehnder-Modulator，MZM)，两个调制器分别对两路第二多载波信号进行调制。IQ调制器中，B1、B2和B3端口用于对IQ调制器的偏置点进行调节，通常B1、B2和B3分别设置在π/2、π/2、和π/2。若IQ调制器对第二多载波信号进行调制时采用单边带调制方式，则输出的第一光信号为单边带信号；若IQ调制器对第二多载波信号进行调制时采用双边带调制方式，则输出的第一光信号为双边带信号。其中，单边带信 号中只有一个边带承载了第二多载波信号中的信源信息，双边带信号中两个边带均承载了第二多载波信号中的信源信息。
双驱动调制器的结构可如图4所示。当图4所示的双驱动调制器用于对第二多载波信号进行光调制时，I端口用于输入CW，O端口用于输出第一光信号，A1端口和A2端口用于将第二多载波信号分为两路分别输入两个调制器，这两个调制器一般均为相位调制器(Phase Modulator，PM)，两个调制器分别对两路第二多载波信号进行调制。双驱动调制器中，B1和B2用于对双驱动调制器的偏置点进行调节。在双驱动调制器中，通常保证B1和B2之差为π/2即可，对B1和B2的具体值不做限定。若双驱动调制器对第二多载波信号进行调制时采用单边带调制方式，则输出的第一光信号为单边带信号；若双驱动调制器对第二多载波信号进行调制时采用双边带调制方式，则输出的第一光信号为双边带信号。
图2所示的色散补偿方法中，接收端向发射端发送的指示信息包括多个最佳相位补偿值与发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系，发射端按照指示信息包括的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行相位补偿。图2所示的色散补偿方法中，由于发射端在对第一多载波信号进行色散补偿时，是按照多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系，采用多个最佳相位补偿值对第一多载波信号中的多个子载波信号进行色散补偿的，与现有技术中用色散表达式对发射端的待发射信号进行补偿相比，图2所示方法中是针对第一多载波信号中的多个子载波信号分别进行补偿的，因而色散补偿更为准确。
图5为采用图2所示色散补偿方法和采用现有技术提供的色散补偿方法后，接收端接收到的第一光信号的信号噪声比(Signal-to-Noise Ratio，SNR)的曲线。由图5可以看出，采用图2所示色散补偿方法可以提高接收端接收到的第一光信号的SNR，补偿色散的效果更好。图6为采用图2所示色散补偿方法和采用现有技术提供的色散补偿方法后，接收端接收到的第一光信号的 误码率(Bit Error Rate，BER)的曲线。由图6可以看出，采用图2所示色散补偿方法可以降低接收端接收到的第一光信号的BER，补偿色散的效果更好。
此外，在执行S201之前，接收端确定多个最佳相位补偿值，可通过发射端和接收端执行如下步骤实现：
在发射端：确定多个预设相位补偿值；分别采用多个预设相位补偿值中的每个预设相位补偿值对第一多载波信号执行如下操作：发射端采用该预设相位补偿值对第一多载波信号中的每个子载波信号进行相位补偿，得到第三多载波信号，发射端对第三多载波信号进行光调制，得到第二光信号，并将第二光信号发送给接收端。由于是采用多个预设相位补偿值中的每个预设相位补偿值分别对第一多载波信号进行相位补偿，进而得到第二光信号，因此发射端发送给接收端的第二光信号的数量与预设相位补偿值的数量相同。
在接收端，接收端接收发射端发送的多个第二光信号，计算多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值，假设第二光信号的数量为M，每个第二光信号包含的子载波信号数量为N，则对于同一个性能指标，需要计算得到的性能指标值的数量为M与N的乘积，M、N均为正整数。接收端根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值。
其中，接收端计算多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值，并根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值，可以理解为：针对第一多载波信号中的任意一个子载波信号，接收端从计算的性能指标值中获取多个第二光信号中每个第二光信号的该子载波信号的性能指标值，即对于同一性能指标，获得的该子载波信号的性能指标值的数量与第二光信号的数量相同；确定每个第二光信号中该子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为该子载波信号对应的最佳相位补偿值。
示例性的，假设在上述实现方式中预设相位补偿值的数量为三个，那么 经过发射端的处理后可以得到与三个预设相位补偿值分别对应的三个第二光信号。此时对第一多载波信号中的任意一个子载波信号来说，该子载波信号存在三个性能指标值，即每个第二光信号均对应一个该子载波信号的性能指标值。接收端获取这三个性能指标值中最优的性能指标值，获取最优的性能指标值时对应的第二光信号所采用的预设相位补偿值即为该子载波信号的最佳相位补偿值。
本发明实施例中，发射端在分别采用每个预设相位补偿值对第一多载波信号执行上述相位补偿、光调制和发送第二光信号这三个操作时，可以采用一个预设相位补偿值对第一多载波信号执行完上述三个操作之后，再采用另一个预设相位补偿值对第一多载波信号执行上述三个操作；也可以在采用一个预设相位补偿值对第一多载波信号未执行完上述三个操作时即开始采用另一个预设相位补偿值对第一多载波信号执行上述三个操作。例如，当多个预设相位补偿值为π/4和π/2时，可以在采用π/4对第一多载波信号进行相位补偿和光调制后，得到一个第二光信号，再采用π/2对第一多载波信号进行相位补偿和光调制，得到另一个第二光信号，然后再分别发送两个第二光信号。
接收端在确定每个子载波信号的最佳相位补偿值时需要根据多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定。其中，每个第二光信号包含的多个子载波信号的性能指标值包括SNR和/或BER。
性能指标值包括SNR时，接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值，具体为：接收端确定每个第二光信号中子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值；
性能指标值包括BER时，接收端确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值，具体为：接收端确定每个 第二光信号中子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值。
需要说明的是，第二光信号的性能指标值不限于SNR和BER，其他可用于衡量第二光信号的性能优劣的性能指标也可作为本发明实施例中确定多个最佳相位补偿值的依据。
示例性的，当第二光信号的性能指标为SNR，且多个预设相位补偿值分别为π/5、2π/5、3π/5、4π/5和π时，在某光纤通信***的接收端计算出的五个第二光信号包含的多个子载波信号的SNR可如图7所示。图7中，用不同的线型区分采用不同预设相位补偿值时第二光信号包含的多个子载波信号的SNR，最佳补偿值曲线代表接收端根据五个第二光信号包含的多个子载波信号的性能指标值确定的多个最佳相位补偿值。
下面在具体场景下举例说明接收端如何确定第一多载波信号中的某一个子载波信号的最佳相位补偿值。以图7所示的五个第二光信号的性能指标值SNR为例，假设现在要接收端确定频率为20GHz的子载波信号的最佳相位补偿值。通过图7，对于频率为20GHz的子载波信号，接收端可获得五个第二光信号中每个第二光信号上该子载波信号的SNR；由于对于第二光信号的子载波信号而言，SNR的值较大时表示性能指标值较优，因而接收端确定五个SNR中最大的SNR，即用方块线型表示的第二光信号中该子载波信号的SNR；最后将对第一多载波信号进行相位补偿获得最大的SNR时所采用的预设相位补偿值作为该子载波信号的最佳相位补偿值，即方块线型表示的该子载波信号的SNR所采用的预设相位补偿值2π/5。
需要说明的是，预设相位补偿值的数量越多，本发明实施例提供的色散补偿方法越准确。本发明实施例中可以设定多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间内，比如，该设定区间可以为[0，π]或者[0，2π]。限定多个预设相位补偿值的取值范围可以避免预设相位补偿值的重复设置，比如，两个预设相位补偿值分别为π/3和7π/3，这两个预设相位补偿值对某个子载波信号进行相位补偿后的效果是相同的，因而这两个预设相 位补偿值就属于重复设置的预设相位补偿值。
此外，在设定多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间内以后，还可进一步设定当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。这样设置的优点是，多个预设相位补偿值可以在上述设定区间内均匀分布，从而使得多个最佳相位补偿值选择得更为准确，使得色散补偿的效果更好。其中，预设步长的值越小，色散补偿的效果越好。
采用上述确定多个最佳相位补偿值的方法，多个最佳相位补偿值是在发射端分别采用多个预设相位补偿值对第一多载波信号进行相位补偿测试的基础上，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的。由于多个最佳相位补偿值是在将光纤通信***中影响色散补偿的因素(比如，传输距离、发射端中各器件的非线性因素和量化噪声、光纤链路中的噪声等)均纳入考虑后，由接收端根据第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值确定的，因而可以使得进行相位补偿后的第一多载波信号(即第二多载波信号)的性能指标值更优，由第二多载波信号进行光调制后得到的第一光信号的性能指标值也更优。
为了便于实现分别采用多个预设相位补偿值中的每个预设相位补偿值对第一多载波信号进行相位补偿，并对得到的第三多载波信号进行光调制、得到第二光信号的过程，可通过循环过程实现上述过程。假设设定区间为[0，π]，预设步长为π/N，那么该循环操作的过程可如图8所示。图8中，当多个预设相位补偿值按数值递增的顺序排列时，发射端设定的第一个预设相位补偿值为0，第二个预设相位补偿值为π/N，第三个预设相位补偿值为2π/N…依此类推。图8中，采用每个预设相位补偿值对第一多载波信号进行相位补偿后，需要对得到的第三多载波信号进行光调制，并将得到的第二光信号发送至接收端后，再通过叠加π/N计算得到下一个预设相位补偿值，然后针对计算得到的下一个预设相位补偿值重复上述相位补偿→光调制→发送第二光信号的过程。图8中，可通过设置N的数值来调整本发明实施例提供的色散补 偿方法的色散补偿精度，N的数值越大，预设步长越小，预设相位补偿值的数量越多，色散补偿的精度越高。
综上，图2所示的色散补偿方法相比于现有技术中的色散补偿方法可以更准确地补偿光纤通信***中的色散。
结合以上，图9提供了采用本发明实施例中的色散补偿方法时，发射端和接收端的详细处理流程。图9所示的处理流程可视为图2所示的色散补偿方法的一种具体实现方式。如图9所示，发射端(Transmitter)对二进制序列(Bit Sequence)进行映射(Mapping)和串并转换(S/P)后，对串并转换后得到的多路并行的时域信号进行IFFT，得到多路并行的频域信号，即本发明实施例中的第一多载波信号；接着将第一多载波信号加入循环前缀(Cyclic Prefix，CP)后输出至子载波信号相位补偿模块(Phase Comp.For subcarriers)；子载波信号相位补偿模块采用图2所示的色散补偿方法对第一多载波信号中的多个子载波信号进行色散补偿后，输出第二多载波信号；对第二多载波信号进行并串转换(P/S)后得到串行的频域信号，将该串行的频域信号分为两路输出，每一路串行的频域信号经过数模转换器(DAC)进行数模转换、放大器进行放大和衰减器进行衰减处理后输入至双驱动调制器，经过双驱动调制器对第二多载波信号进行双边带调制后，将得到的第一光信号输出至接收端(Receiver)，接收端对第一光信号进行与发射端的操作相反的操作后，可以还原出发射端发射的二进制序列。由于图9中的子载波信号相位补偿模块采用图2所示的色散补偿方法，因而相比于现有技术，可以更准确地对光纤通信***进行色散补偿。
此外，接收端可设置子载波信号SNR计算模块(SNR Cal.For subcarriers)，该模块可在接收到发射端发送的多个第二光信号后，计算每个第二光信号包含的多个子载波信号的SNR；接收端还可设置BER计算模块(BER Calculation)，该模块可在接收到发射端发送的多个第二光信号后，计算每个第二光信号包含的多个子载波信号的BER。进而，接收端可以根据计算的每个第二光信号包含的多个子载波信号的SNR的值和/或BER的值确定第一多 载波信号中的每个子载波信号对应的最佳相位补偿值，计算得到的多个最佳相位补偿值可分别用于发射端的子载波信号相位补偿模块对第一多载波信号中的多个子载波信号进行相位补偿。
本发明实施例提供一种色散补偿装置，该装置可用于执行图2所示方法中发射端所执行的操作。如图10所示，色散补偿装置1000包括：
接收模块1001，用于接收光纤通信***的接收端发送的指示信息，指示信息包括多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信号的一一对应关系；
相位补偿模块1002，用于按照接收模块1001接收的指示信息包括的一一对应关系，采用多个最佳相位补偿值对多个子载波信号进行相位补偿，得到第二多载波信号；
光调制模块1003，用于对相位补偿模块1002补偿得到的第二多载波信号进行光调制，得到第一光信号；
发送模块1004，用于将光调制模块1003调制得到的第一光信号发送给接收端。
可选地，色散补偿装置1000还包括：确定模块，用于在接收模块1001接收接收端发送的指示信息之前，确定多个预设相位补偿值；相位补偿模块1002，还用于分别采用多个预设相位补偿值中的每个预设相位补偿值对第一多载波信号中的每个子载波信号进行相位补偿，得到第三多载波信号；光调制模块1003，还用于对第三多载波信号进行光调制，得到第二光信号，第二光信号用于接收端根据第二光信号包含的多个子载波信号的性能指标值确定一一对应关系；发送模块1004，还用于将第二光信号发送给接收端。
可选地，第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；针对第一多载波信号中的任意一个子载波信号，性能指标值包括SNR时，多个第二光信号中子载波信号的SNR最大时采用的预设相位补偿值为子载波信号对应的最佳相位补偿值；性能指标值包括BER时，多个第二光信号中子载波信号的BER最小时采用的预设相位补偿值为子 载波信号对应的最佳相位补偿值。
可选地，多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
可选地，色散补偿装置1000还包括：傅里叶逆变换模块，用于在光调制模块1003对第二多载波信号进行光调制之前，对第二多载波信号进行傅里叶逆变换。
需要说明的是，本发明实施例提供的色散补偿装置1000可用于执行图2所示的色散补偿方法中发射端执行的操作，色散补偿装置1000未详细解释和描述的实现方式可参考图2所示的色散补偿方法中的相关描述。
需要说明的是，本发明实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。另外，在本申请各个实施例中的各功能模块可以集成在一个处理模块中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
基于以上实施例，本发明实施例还提供一种色散补偿装置。如图11所示，该色散补偿装置1100可执行图2对应的实施例提供的方法，可以与图10所示的色散补偿装置1000相同。
色散补偿装置1100包括：
收发机1101，用于接收光纤通信***的接收端发送的指示信息，该指示信息包括多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信号的一一对应关系；
数字信号处理器1102，用于按照收发机1101接收的指示信息包括的一一对应关系，采用多个最佳相位补偿值对多个子载波信号进行相位补偿，得到第二多载波信号；
电光调制器1103，用于对数字信号处理器补偿得到的第二多载波信号进行光调制，得到第一光信号；
收发机1101，还用于将电光调制器调制得到的第一光信号发送给接收端。
需要说明的是，色散补偿装置1100可以是与图10所示的色散补偿装置1000相同的装置。收发机1101可用于执行色散补偿装置1000中的接收模块1001和发送模块1004所执行的操作，数字信号处理器1102可用于执行色散补偿装置1000中相位补偿模块1002所执行的操作，电光调制器1103可用于执行色散补偿装置1000中光调制模块1003所执行的操作。此外，数字信号处理器1102可用于执行色散补偿装置1000中确定模块和傅里叶逆变换模块所执行的操作。色散补偿装置1100中未详细解释和描述的实现方式可参考色散补偿装置1100中的相关描述。
本发明实施例提供一种色散补偿装置，该色散补偿装置可用于执行图2所示方法中接收端执行的操作。如图12所示，色散补偿装置1200包括：
确定模块1201，用于确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；
指示信息生成模块1202，用于生成指示信息，指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；
发送模块1203，用于将指示信息发送给发射端。
可选地，色散补偿装置1200还包括：接收模块，用于在确定模块1201确定一一对应关系之前，接收发射端发送的多个第二光信号，多个第二光信号为发射端分别对多个第二多载波信号进行光调制得到的，多个第二多载波信号为发射端采用多个预设相位补偿值中的每个预设相位补偿值分别对第一多载波信号中的每个子载波信号进行相位补偿得到的；确定模块1201在确定一一对应关系时，具体用于：计算多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值；根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值。
可选地，确定模块1201在根据计算的性能指标值，分别确定第一多载波信号中的每个子载波信号对应的最佳相位补偿值时，具体用于：针对第一多载波信号中的任意一个子载波信号，从计算的性能指标值中获取多个第二光 信号中每个第二光信号的子载波信号的性能指标值；确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值。
可选地，每个第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
性能指标值包括SNR时，确定模块1201在确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值时，具体用于：确定每个第二光信号中子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值；
性能指标值包括BER时，确定模块1201在确定每个第二光信号中子载波信号的性能指标值中最优的性能指标值，并将获得最优的性能指标值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值时，具体用于：确定每个第二光信号中子载波信号的SNR最大值，并将获得SNR最大值时采用的预设相位补偿值作为子载波信号对应的最佳相位补偿值。
可选地，多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当多个预设相位补偿值按数值递增的顺序排列时，多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
需要说明的是本发明实施例提供的色散补偿装置1200可用于执行图2所示的色散补偿方法中接收端执行的操作，色散补偿装置1200未详细解释和描述的实现方式可参考图2所示的色散补偿方法中的相关描述。
基于以上实施例，本发明实施例还提供一种色散补偿装置。如图13所示，该色散补偿装置1300可执行图2对应的实施例提供的方法，可以与图12所示的色散补偿装置1200相同。
色散补偿装置1300包括：
数字信号处理器1301，用于确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；以及 生成指示信息，指示信息包括多个最佳相位补偿值与第一多载波信号中的多个子载波信号的一一对应关系；
收发机1302，用于将指示信息发送给发射端。
需要说明的是，色散补偿装置1300可以是与图12所示的色散补偿装置1200相同的装置。收发机1302可用于执行色散补偿装置1200中的发送模块1203和接收模块所执行的操作，数字信号处理器1301可用于执行色散补偿装置1200中确定模块1201和指示信息生成模块1202所执行的操作。色散补偿装置1300中未详细解释和描述的实现方式可参考色散补偿装置1200中的相关描述。
综上，本发明实施例提供一种色散补偿方法和装置，从而更准确地补偿光纤通信***中的色散。
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、***、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采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、CD-ROM、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(***)、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，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生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。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (22)

  1. 一种色散补偿方法，其特征在于，包括：
    发射端接收光纤通信***的接收端发送的指示信息，所述指示信息包括多个最佳相位补偿值与所述发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；
    所述发射端按照所述一一对应关系，采用所述多个最佳相位补偿值对所述多个子载波信号进行相位补偿，得到第二多载波信号；
    所述发射端对所述第二多载波信号进行光调制，得到第一光信号，并将所述第一光信号发送给所述接收端。
  2. 如权利要求1所述的方法，其特征在于，所述发射端接收接收端发送的指示信息之前，还包括：
    所述发射端确定多个预设相位补偿值；
    所述发射端分别采用所述多个预设相位补偿值中的每个预设相位补偿值对所述第一多载波信号执行如下操作：
    采用所述预设相位补偿值对所述第一多载波信号中的每个子载波信号进行相位补偿，得到第三多载波信号；
    对所述第三多载波信号进行光调制，得到第二光信号，并将所述第二光信号发送给所述接收端，所述第二光信号用于所述接收端根据所述第二光信号包含的多个子载波信号的性能指标值确定所述一一对应关系。
  3. 如权利要求2所述的方法，其特征在于，所述第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
    针对所述第一多载波信号中的任意一个子载波信号，所述性能指标值包括SNR时，多个第二光信号中所述子载波信号的SNR最大时采用的预设相位补偿值为所述子载波信号对应的最佳相位补偿值；所述性能指标值包括BER时，所述多个第二光信号中所述子载波信号的BER最小时采用的预设相位补偿值为所述子载波信号对应的最佳相位补偿值。
  4. 如权利要求2或3所述的方法，其特征在于，所述多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当所述多个预设相位补偿值按数值递增的顺序排列时，所述多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
  5. 如权利要求1～4任一项所述的方法，其特征在于，所述发射端对所述第二多载波信号进行光调制之前，还包括：
    所述发射端对所述第二多载波信号进行傅里叶逆变换。
  6. 一种色散补偿方法，其特征在于，包括：
    接收端确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；
    所述接收端生成指示信息，所述指示信息包括所述多个最佳相位补偿值与所述第一多载波信号中的多个子载波信号的一一对应关系；
    所述接收端将所述指示信息发送给所述发射端。
  7. 如权利要求6所述的方法，其特征在于，所述接收端确定所述一一对应关系之前，还包括：
    所述接收端接收所述发射端发送的多个第二光信号，所述多个第二光信号为所述发射端分别对多个第二多载波信号进行光调制得到的，所述多个第二多载波信号为所述发射端采用多个预设相位补偿值中的每个预设相位补偿值分别对所述第一多载波信号中的每个子载波信号进行相位补偿得到的；
    所述接收端确定所述一一对应关系，包括：
    所述接收端计算所述多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值；
    所述接收端根据计算的所述性能指标值，分别确定所述第一多载波信号中的每个子载波信号对应的最佳相位补偿值。
  8. 如权利要求7所述的方法，其特征在于，所述接收端根据计算的所述性能指标值，分别确定所述第一多载波信号中的每个子载波信号对应的最佳相位补偿值，包括：
    针对所述第一多载波信号中的任意一个子载波信号，所述接收端从计算的所述性能指标值中获取所述多个第二光信号中每个第二光信号的所述子载波信号的性能指标值；
    所述接收端确定所述每个第二光信号中所述子载波信号的性能指标值中最优的性能指标值，并将获得所述最优的性能指标值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值。
  9. 如权利要求8所述的方法，其特征在于，所述每个第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
    所述性能指标值包括SNR时，所述接收端确定所述每个第二光信号中所述子载波信号的性能指标值中最优的性能指标值，并将获得所述最优的性能指标值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值，具体为：所述接收端确定所述每个第二光信号中所述子载波信号的SNR最大值，并将获得所述SNR最大值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值；
    所述性能指标值包括BER时，所述接收端确定所述每个第二光信号中所述子载波信号的性能指标值中最优的性能指标值，并将获得所述最优的性能指标值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值，具体为：所述接收端确定所述每个第二光信号中所述子载波信号的SNR最大值，并将获得所述SNR最大值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值。
  10. 如权利要求7～9任一项所述的方法，其特征在于，所述多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当所述多个预设相位补偿值按数值递增的顺序排列时，所述多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
  11. 一种色散补偿装置，其特征在于，包括：
    接收模块，用于接收光纤通信***的接收端发送的指示信息，所述指示信息包括多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信 号的一一对应关系；
    相位补偿模块，用于按照所述接收模块接收的所述指示信息包括的所述一一对应关系，采用所述多个最佳相位补偿值对所述多个子载波信号进行相位补偿，得到第二多载波信号；
    光调制模块，用于对所述相位补偿模块补偿得到的所述第二多载波信号进行光调制，得到第一光信号；
    发送模块，用于将所述光调制模块调制得到的所述第一光信号发送给所述接收端。
  12. 如权利要求11所述的装置，其特征在于，还包括：
    确定模块，用于在所述接收模块接收所述接收端发送的所述指示信息之前，确定多个预设相位补偿值；
    所述相位补偿模块，还用于分别采用所述多个预设相位补偿值中的每个预设相位补偿值对所述第一多载波信号中的每个子载波信号进行相位补偿，得到第三多载波信号；
    所述光调制模块，还用于对所述第三多载波信号进行光调制，得到第二光信号，所述第二光信号用于所述接收端根据所述第二光信号包含的多个子载波信号的性能指标值确定所述一一对应关系；
    所述发送模块，还用于将所述第二光信号发送给所述接收端。
  13. 如权利要求12所述的装置，其特征在于，所述第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
    针对所述第一多载波信号中的任意一个子载波信号，所述性能指标值包括SNR时，多个第二光信号中所述子载波信号的SNR最大时采用的预设相位补偿值为所述子载波信号对应的最佳相位补偿值；所述性能指标值包括BER时，所述多个第二光信号中所述子载波信号的BER最小时采用的预设相位补偿值为所述子载波信号对应的最佳相位补偿值。
  14. 如权利要求12或13所述的装置，其特征在于，所述多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当所述多个预设相位 补偿值按数值递增的顺序排列时，所述多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
  15. 如权利要求11～14任一项所述的装置，其特征在于，还包括：
    傅里叶逆变换模块，用于在所述光调制模块对所述第二多载波信号进行光调制之前，对所述第二多载波信号进行傅里叶逆变换。
  16. 一种色散补偿装置，其特征在于，包括：
    确定模块，用于确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；
    指示信息生成模块，用于生成指示信息，所述指示信息包括所述多个最佳相位补偿值与所述第一多载波信号中的多个子载波信号的一一对应关系；
    发送模块，用于将所述指示信息发送给所述发射端。
  17. 如权利要求16所述的装置，其特征在于，还包括：
    接收模块，用于在所述确定模块确定所述一一对应关系之前，接收所述发射端发送的多个第二光信号，所述多个第二光信号为所述发射端分别对多个第二多载波信号进行光调制得到的，所述多个第二多载波信号为所述发射端采用多个预设相位补偿值中的每个预设相位补偿值分别对所述第一多载波信号中的每个子载波信号进行相位补偿得到的；
    所述确定模块在确定所述一一对应关系时，具体用于：
    计算所述多个第二光信号中的每个第二光信号包含的多个子载波信号的性能指标值；根据计算的所述性能指标值，分别确定所述第一多载波信号中的每个子载波信号对应的最佳相位补偿值。
  18. 如权利要求17所述的装置，其特征在于，所述确定模块在根据计算的所述性能指标值，分别确定所述第一多载波信号中的每个子载波信号对应的最佳相位补偿值时，具体用于：
    针对所述第一多载波信号中的任意一个子载波信号，从计算的所述性能指标值中获取所述多个第二光信号中每个第二光信号的所述子载波信号的性能指标值；确定所述每个第二光信号中所述子载波信号的性能指标值中最优 的性能指标值，并将获得所述最优的性能指标值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值。
  19. 如权利要求18所述的装置，其特征在于，所述每个第二光信号包含的多个子载波信号的性能指标值包括信号噪声比SNR和/或误码率BER；
    所述性能指标值包括SNR时，所述确定模块在确定所述每个第二光信号中所述子载波信号的性能指标值中最优的性能指标值，并将获得所述最优的性能指标值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值时，具体用于：
    确定所述每个第二光信号中所述子载波信号的SNR最大值，并将获得所述SNR最大值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值；
    所述性能指标值包括BER时，所述确定模块在确定所述每个第二光信号中所述子载波信号的性能指标值中最优的性能指标值，并将获得所述最优的性能指标值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值时，具体用于：
    确定所述每个第二光信号中所述子载波信号的SNR最大值，并将获得所述SNR最大值时采用的预设相位补偿值作为所述子载波信号对应的最佳相位补偿值。
  20. 如权利要求17～19任一项所述的装置，其特征在于，所述多个预设相位补偿值中的每个预设相位补偿值均位于同一设定区间；当所述多个预设相位补偿值按数值递增的顺序排列时，所述多个预设相位补偿值中任意相邻两个预设相位补偿值的差值为预设步长。
  21. 一种色散补偿装置，其特征在于，包括：
    收发机，用于接收光纤通信***的接收端发送的指示信息，所述指示信息包括多个最佳相位补偿值与待发射的第一多载波信号中的多个子载波信号的一一对应关系；
    数字信号处理器，用于按照所述收发机接收的所述指示信息包括的所述 一一对应关系，采用所述多个最佳相位补偿值对所述多个子载波信号进行相位补偿，得到第二多载波信号；
    电光调制器，用于对所述数字信号处理器补偿得到的所述第二多载波信号进行光调制，得到第一光信号；
    所述收发机，还用于将所述电光调制器调制得到的所述第一光信号发送给所述接收端。
  22. 一种色散补偿装置，其特征在于，包括：
    数字信号处理器，用于确定多个最佳相位补偿值与光纤通信***的发射端待发射的第一多载波信号中的多个子载波信号的一一对应关系；以及生成指示信息，所述指示信息包括所述多个最佳相位补偿值与所述第一多载波信号中的多个子载波信号的一一对应关系；
    收发机，用于将所述指示信息发送给所述发射端。
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