WO2016180080A1 - Procédé et dispositif de détermination de rapport signal-bruit optique (osnr) - Google Patents

Procédé et dispositif de détermination de rapport signal-bruit optique (osnr) Download PDF

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Publication number
WO2016180080A1
WO2016180080A1 PCT/CN2016/076640 CN2016076640W WO2016180080A1 WO 2016180080 A1 WO2016180080 A1 WO 2016180080A1 CN 2016076640 W CN2016076640 W CN 2016076640W WO 2016180080 A1 WO2016180080 A1 WO 2016180080A1
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Prior art keywords
optical signal
determining
noise ratio
determined
total
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PCT/CN2016/076640
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English (en)
Chinese (zh)
Inventor
杨爱英
华锋
施社平
王会涛
沈百林
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中兴通讯股份有限公司
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Publication of WO2016180080A1 publication Critical patent/WO2016180080A1/fr

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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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for determining an optical signal to noise ratio OSNR.
  • OSNR Optical Signal-Noise Ratio
  • WDM Wavelength Division Multiplexing
  • the linear interpolation of the ASE noise power is used as the ASE noise power in the WDM channel band to measure the OSNR value.
  • the measurement of the WDM channel OSNR is typically performed using a spectral analyzer with a 0.1 nm resolution bandwidth.
  • the above method can accurately estimate the OSNR level.
  • ROADM Reconfigurable Optical Add-Drop Multiplexer
  • OXC Optical Cross-Connect
  • Non-data-assisted methods include polarization zeroing, delay interferometry, beat frequency noise method, error vector magnitude method, and moment method.
  • the error vector magnitude method and the moment method are relatively simple to implement, and are suitable for linear optical communication systems, but the monitoring error is relatively large.
  • the error vector amplitude method monitors the optical signal-to-noise ratio by measuring the error vector magnitude of the constellation of the received optical signal and the reference constellation. It is necessary to first perform frequency offset and phase noise estimation on the correlated optical received signal, and the monitoring system is complex, and the modulation format is Related.
  • the moment method assumes that the ASE noise and optical signal of the optical amplifier are statistically independent and have no interaction. By calculating the second and fourth moments of the coherent optical demodulation signal, the optical signal to noise ratio is monitored and also related to the modulation format. Both the error vector magnitude method and the moment method assume that the signal and noise do not interact, and the calculated noise is used as the ASE noise of the amplifier, thus overestimating the ASE noise, resulting in a large error in the monitored optical signal-to-noise ratio.
  • the invention provides a method and a device for determining an optical signal-to-noise ratio OSNR, so as to at least solve the problem that the detected optical signal-to-noise ratio error is large in the related art.
  • a method for determining an optical signal-to-noise ratio OSNR includes: determining a noise power correction factor k; correcting a noise power P N of the detected optical signal according to the determined k; according to the corrected noise
  • the power P ASE determines the optical signal to noise ratio OSNR.
  • n is a positive integer; wherein the predetermined process comprises: performing coherent demodulation on the optical signal to obtain a real part and an imaginary part of the coherently demodulated optical signal;
  • the real part performs transimpedance amplification and analog-to-digital conversion processing, performs transimpedance amplification and analog-to-digital conversion processing on the imaginary part of the optical signal; and real and virtual after trans-resistance amplification and analog-to-digital conversion processing Digital signal processing are performed; after the digital signal processing of the real part and the imaginary part for dispersion equalization.
  • correcting the noise power P N of the detected optical signal according to the determined k comprises: correcting the P N by :
  • determining the optical signal to noise ratio OSNR according to the modified noise power P ASE includes: determining a signal carrier-to-noise ratio CNR by using the following formula:
  • the OSNR is determined by the following formula: Where R B is the symbol rate and B r is the reference bandwidth for measuring the optical signal to noise ratio.
  • an apparatus for determining an optical signal-to-noise ratio OSNR comprising: a first determining module configured to determine a noise power correction factor k; and a second determining module configured to be corrected according to the determined k The noise power P N of the detected optical signal; a third determining module configured to determine the optical signal to noise ratio OSNR based on the corrected noise power P ASE .
  • n is a positive integer; wherein the predetermined process comprises: performing coherent demodulation on the optical signal to obtain a real part and an imaginary part of the coherently demodulated optical signal;
  • the real part performs transimpedance amplification and analog-to-digital conversion processing, performs transimpedance amplification and analog-to-digital conversion processing on the imaginary part of the optical signal; and real and virtual after trans-resistance amplification and analog-to-digital conversion processing Digital signal processing are performed; after the digital signal processing of the real part and the imaginary part for dispersion equalization.
  • the second determining module includes: modifying the PN by :
  • the third determining module includes: determining a signal carrier-to-noise ratio CNR by using the following formula:
  • the OSNR is determined by the following formula: Where R B is the symbol rate and B r is the reference bandwidth for measuring the optical signal to noise ratio.
  • the noise power correction factor k is determined; the noise power P N of the detected optical signal is corrected according to the determined k; and the optical signal to noise ratio OSNR is determined based on the corrected noise power P ASE . Calculating the optical signal-to-noise ratio by using the corrected noise power can improve the calculation accuracy and reduce the calculation error, thereby solving the problem that the detected optical signal-to-noise ratio error is large in the related art, thereby achieving the reduction of the detected optical signal. The effect of the noise ratio error.
  • FIG. 1 is a flow chart of a method of determining an optical signal to noise ratio OSNR according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing the structure of an apparatus for determining an optical signal-to-noise ratio OSNR according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of a first determining module 22 in an apparatus for determining an optical signal-to-noise ratio OSNR according to an embodiment of the present invention
  • FIG. 4 is an overall flow chart of in-band OSNR monitoring of an optical communication system based on second-order moment and noise correction, in accordance with an embodiment of the present invention
  • FIG. 5 is a diagram of an in-band OSNR monitoring apparatus for an optical communication system based on second-order moment and noise correction, in accordance with an embodiment of the present invention
  • FIG. 6 is a schematic diagram of total signal power after coherent reception of a 30.2 GB QPSK optical signal with a fiber input power of -3.0, +0.0, and +2.0 dBm, respectively, according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of total noise power after coherent reception of a 30.2 GB QPSK optical signal with a fiber input power of -3.0, +0.0, and +2.0 dBm, respectively, according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of noise correction factors of a 30.2 GB QPSK optical signal with a fiber input power of -3.0, +0.0, and +2.0 dBm, respectively, according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of optical signal to noise ratio monitoring values of a 30.2 GB QPSK optical signal with a fiber input power of -3.0, +0.0, and +2.0 dBm, respectively, according to an embodiment of the present invention.
  • FIG. 10 is a diagram showing error values of optical signal to noise ratio monitoring of a 30.2 GB QPSK signal according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for determining an optical signal-to-noise ratio OSNR according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps. :
  • Step S102 determining a noise power correction factor k
  • Step S104 correcting the noise power P N of the detected optical signal according to the determined k;
  • Step S106 determining an optical signal to noise ratio OSNR based on the corrected noise power P ASE .
  • calculating the optical signal-to-noise ratio by using the corrected noise power can improve the calculation accuracy and reduce the calculation error, thereby solving the problem that the detected optical signal-to-noise ratio error is large in the related art, thereby achieving a reduction.
  • the effect of the detected optical signal to noise ratio error can improve the calculation accuracy and reduce the calculation error, thereby solving the problem that the detected optical signal-to-noise ratio error is large in the related art, thereby achieving a reduction.
  • the total power P total of the optical signal and the noise power P N of the optical signal may be determined; according to the determined P total and P N determines the correction factor k.
  • the above determination manner is only an example, and the correction factor k may be determined in other manners.
  • P total E ⁇
  • the predetermined processing may include the following steps: performing coherent demodulation on the optical signal to obtain a real part and an imaginary part of the coherent demodulated optical signal; performing cross-resistance amplification and analog-to-digital conversion processing on the real part of the optical signal,
  • the imaginary part of the optical signal is subjected to transimpedance amplification and analog-to-digital conversion processing; the real and imaginary parts subjected to transimpedance amplification and analog-to-digital conversion are subjected to digital signal processing; and the real and imaginary parts after digital signal processing are processed. Both are dispersion-balanced.
  • the noise power P N of the detected optical signal according to the determined k includes: correcting P N by the following formula:
  • the P ASE is the corrected noise power.
  • the OSNR may be determined based on the corrected noise power P ASE .
  • determining the optical signal-to-noise ratio OSNR based on the corrected noise power includes: determining the signal load by the following formula Noise ratio CNR:
  • the OSNR is determined by the following formula: Where R B is the symbol rate and B r is the reference bandwidth for measuring the optical signal to noise ratio.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • a storage medium such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.
  • a device for determining the optical signal-to-noise ratio is provided.
  • the device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 2 is a structural block diagram of an apparatus for determining an optical signal-to-noise ratio OSNR according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes a first determining module 22, a second determining module 24, and a third determining module 26, The device will be described.
  • the first determining module 22 is configured to determine a noise power correction factor k; the second determining module 24 is connected to the first determining module 22, and is configured to correct the noise power P N of the detected optical signal according to the determined k; The determining module 26 is coupled to the second determining module 24 and configured to determine the optical signal to noise ratio OSNR based on the corrected noise power P ASE .
  • FIG. 3 is a structural block diagram of a first determining module 22 in an apparatus for determining an optical signal-to-noise ratio (OSNR) according to an embodiment of the present invention.
  • the first determining module 22 includes a first determining unit 32 and a second determining unit. 34.
  • the first determining module 22 will be described below.
  • the first determining unit 32 is configured to determine the total power P total of the optical signal and the noise power P N of the optical signal; the second determining unit 34 is connected to the first determining unit 32, and is set according to the determined P total and P N Determine k.
  • P total :P total E ⁇
  • E ⁇ is a second-order moment operation
  • y ⁇ y n ⁇
  • y n is after the predetermined processing of the optical signal
  • the value of the optical signal at n values, y n Re(y n )+i*Im(y n )
  • Re(y n ) is the real part, Im(y n ) is the imaginary part, and n is positive An integer;
  • ⁇ ) 2 , where y ⁇ y n ⁇ , y n is the value of the optical signal at the nth point after the predetermined processing of the optical signal,
  • the predetermined processing may include: performing coherent demodulation on the optical signal to obtain a real part and an imaginary part of the coherently demodulated optical signal; performing transimpedance amplification and analog-to-digital conversion processing on the real part of the optical signal, and virtualizing the optical signal
  • the part performs transimpedance amplification and analog-to-digital conversion processing; performs digital signal processing on both the real part and the imaginary part after transimpedance amplification and analog-to-digital conversion processing; and performs dispersion-equalization on both the real part and the imaginary part after digital signal processing .
  • the second determining module 24 includes: correcting P N by the following formula:
  • the third determining module 26 includes: determining a signal carrier-to-noise ratio CNR by using the following formula:
  • the OSNR is determined by the following formula: Where R B is the symbol rate and B r is the reference bandwidth for measuring the optical signal to noise ratio.
  • 4 is an overall flow chart of in-band OSNR monitoring of an optical communication system based on second-order moment and noise correction according to an embodiment of the present invention. As shown in FIG. 4, the process includes the following steps:
  • Step S402 receiving the monitored optical signal, and performing coherent demodulation on the monitored optical signal to obtain a real part and an imaginary part of the monitored signal, and the real part and the imaginary part signal are respectively subjected to transimpedance amplification and analog-to-digital conversion, and then performed by the DSP.
  • Step S410 using the correction factor k, calculating the ASE noise power P ASE by using
  • Step S412 calculating a signal carrier-to-noise ratio (CNR) by using
  • Step S414 calculating an optical signal-to-noise ratio (OSNR) of the signal by using
  • SNR dB is the value of OSNR
  • R B is the symbol rate
  • B r is the reference bandwidth for measuring the optical signal-to-noise ratio, typically 12.5 GHz.
  • an optical communication system in-band OSNR monitoring apparatus implemented in accordance with the method of the present invention may include The following modules: a coherent demodulation module 52, a cross-group amplification module 54, an analog-to-digital conversion module 56, and a DSP module 58, and an optical signal to noise ratio monitoring module 510.
  • the monitored optical signal first enters the coherent demodulation module 52.
  • the coherent demodulation module 52 is composed of an optical mixer and a balanced detector.
  • the coherent demodulation module 52 outputs the real and imaginary signals of the optical signal, and the real part of the optical signal.
  • the imaginary part signal is respectively subjected to the transimpedance amplification of the cross-group amplification module 54 and the analog-to-digital conversion of the analog-to-digital conversion module 56, and then input into the DSP module 58 for dispersion equalization, and the real and imaginary signals output by the dispersion equalization module enter the optical signal noise.
  • the optical signal to noise ratio monitoring module 510 includes a second order moment calculation, a noise power calculation, an ASE noise power correction, and an optical signal to noise ratio calculation.
  • a 30.2 GB offset multiplexed Quadrature Phase Shift Keying (QPSK) signal is generated and input to the fiber link.
  • QPSK Quadrature Phase Shift Keying
  • the signal power of the input fiber is changed to -3.0 dBm, 0.0 dBm, and +2.0 dBm, respectively.
  • the filter bandwidth is changed to 28 GHz and 30.2 GHz, respectively.
  • FIG. 6 is a schematic diagram of total signal power after coherent reception of a 30.2 GB QPSK optical signal with a fiber input power of -3.0, +0.0, and +2.0 dBm, respectively, according to an embodiment of the present invention
  • FIG. 7 is a fiber input power according to an embodiment of the present invention.
  • Figure 6 and Figure 7 show the total signal power and total noise power after the coherent reception of the 30.2 GB QPSK optical signals with the fiber-input powers of -3.0, +0.0, and +2.0 dBm, respectively, as a function of the reference signal-to-noise ratio.
  • FIG. 6 It can be seen from FIG. 6 that the total power of the coherent received signal does not change much with the reference optical signal-to-noise ratio and the fiber-input power. As can be seen from Fig. 7, the total power of the noise in the coherent received signal varies significantly with the power of the fiber.
  • a noise correction factor is defined.
  • FIG. 8 is a 30.2 GB QPSK optical signal with a fiber input power of -3.0, +0.0, +2.0 dBm, respectively, according to an embodiment of the present invention. Schematic diagram of the noise correction factor. The noise power is corrected by using a correction factor to obtain an optical signal to noise ratio of the optical signal to be measured.
  • FIG. 8 Schematic diagram of the noise correction factor. The noise power is corrected by using a correction factor to obtain an optical signal to noise ratio of the optical signal to be measured.
  • FIG. 10 is a schematic diagram showing error values of optical signal-to-noise ratio (SNR) monitoring of a 30.2 GB QPSK signal according to an embodiment of the present invention.
  • SNR optical signal-to-noise ratio
  • FIG. 10 a 30.2 GB offset-multiplexed QPSK signal with a reference optical signal-to-noise ratio of 15.0 to 25.0 dB is shown.
  • the optical signal-to-noise ratio monitoring error is within ⁇ 1.0 dB under different fiber input power and different filter bandwidth conditions.
  • the second-order moment and the noise power correction method are adopted, and the monitoring error in the range of the reference signal-to-noise ratio of 15.0 to 25.0 dB is within ⁇ 1.0 dB, and is independent of the filter effect on the fiber link.
  • the optical signal to noise ratio monitoring method provided in the embodiment of the present invention is simple, and the monitoring accuracy is improved, and is applicable to different modulation formats, Monitoring of fiber link signals with different fiber power and different filtering effects.
  • the system used in the invention comprises coherent demodulation, cross-group amplification, analog-to-digital conversion and dispersion equalization and optical signal-to-noise ratio calculation modules, and the optical signal-to-noise ratio of the optical signal is monitored by these modules, and good effects are obtained.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the method and apparatus for determining the optical signal-to-noise ratio OSNR provided by the embodiments of the present invention have the following beneficial effects: solving the problem that the detected optical signal-to-noise ratio error is large in the related art, and further reducing The effect of the detected optical signal to noise ratio error.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé et un dispositif de détermination d'un rapport signal-bruit optique (OSNR). Le procédé comporte les étapes consistant à: déterminer un facteur k de correction de puissance de bruit, et corriger, en fonction du k déterminé, une puissance de bruit PN d'un signal optique détecté; et déterminer, en fonction de la puissance de bruit corrigée PASE, un rapport signal-bruit optique (OSNR). La présente invention résout le problème de l'erreur importante d'un rapport signal-bruit optique détecté dans la technique apparentée, et a en outre pour effet de réduire l'erreur du rapport signal-bruit optique détecté.
PCT/CN2016/076640 2015-05-13 2016-03-17 Procédé et dispositif de détermination de rapport signal-bruit optique (osnr) WO2016180080A1 (fr)

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CN107276669B (zh) * 2017-06-17 2019-09-20 邹恒 超高速率超密集波分复用光信噪比监测方法及系统
CN109802723B (zh) 2017-11-16 2022-03-08 富士通株式会社 监测光信噪比的方法、装置、接收机和通信系统
CN110875775B (zh) * 2019-11-22 2020-09-22 苏州大学 Qam相干光通信系统中基于矩的精度增强的osnr监测方法
CN112217563B (zh) * 2020-09-27 2022-05-13 武汉光迅科技股份有限公司 一种光信号的处理方法、系统、电子设备及存储介质

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CN104079347A (zh) * 2013-03-26 2014-10-01 武汉光迅科技股份有限公司 一种光信噪比测量方法
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EP2096422A1 (fr) * 2006-11-29 2009-09-02 Fujitsu Limited Procédé de calcul d'indice de bruit optique, dispositif de calcul d'indice de bruit optique, et oscilloscope d'échantillonnage optique
CN104079347A (zh) * 2013-03-26 2014-10-01 武汉光迅科技股份有限公司 一种光信噪比测量方法
CN104753591A (zh) * 2013-12-27 2015-07-01 中国移动通信集团公司 一种监测光信噪比的方法及装置

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