WO2023124950A1 - 光信噪比的测量方法和系统 - Google Patents

光信噪比的测量方法和系统 Download PDF

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WO2023124950A1
WO2023124950A1 PCT/CN2022/138488 CN2022138488W WO2023124950A1 WO 2023124950 A1 WO2023124950 A1 WO 2023124950A1 CN 2022138488 W CN2022138488 W CN 2022138488W WO 2023124950 A1 WO2023124950 A1 WO 2023124950A1
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optical
optical signal
signal
power
narrowband
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PCT/CN2022/138488
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French (fr)
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张之坤
张明超
朱晓宇
赵志勇
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中兴通讯股份有限公司
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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
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07953—Monitoring or measuring OSNR, BER or Q
    • 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
    • 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
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • 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
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power

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  • the embodiments of the present application relate to the technical field of optical transport networks, and in particular to a method and system for measuring an optical signal-to-noise ratio.
  • OSNR Optical Signal Noise Ratio, optical signal-to-noise ratio
  • ASE noise amplifier spontaneous emission noise
  • OSNR is related to BER (Bit Error Ratio, bit error rate)
  • BER Bit Error Ratio, bit error rate
  • the main purpose of the embodiments of the present application is to propose a method and system for measuring an optical signal-to-noise ratio, which aims to obtain more accurate out-of-band noise power, so that the accuracy of the finally calculated signal-to-noise ratio can be improved.
  • an embodiment of the present application provides a method for measuring an optical signal-to-noise ratio, including: acquiring a narrowband optical signal, using the narrowband optical signal to simulate the transmission of a service optical signal in an optical channel, and the narrowband optical signal
  • the bandwidth is such that the narrowband optical signal is not affected by the filtering effect and the crosstalk of the service optical signal in the optical channel adjacent to the optical channel; the out-of-band noise power and optical power; calculating the signal-to-noise ratio of the optical channel according to the out-of-band noise power and the optical power.
  • an embodiment of the present application also proposes an optical signal-to-noise ratio measurement system, including:
  • An optical signal generating module configured to generate a narrowband optical signal, through which the analog service optical signal is transmitted in the optical channel, and the narrowband optical signal is not affected by filtering effect and crosstalk of adjacent optical channel service optical signals;
  • the optical performance detection module acquires the out-of-band noise power and optical power of the narrowband optical signal, and calculates the signal-to-noise ratio of the optical channel according to the out-of-band noise power and optical power.
  • a method and system for measuring optical signal-to-noise ratio proposed in this application uses narrow-band optical signals to simulate service optical signals transmitted in optical channels, and the narrow bandwidth of narrow-band optical signals prevents them from filtering effects and traffic in adjacent optical channels.
  • the influence of optical signal crosstalk that is, the edge of the narrowband optical signal does not overlap with the edge of other service signals, so that the calibrated optical performance detection module can accurately obtain the out-of-band noise power of the narrowband optical signal, according to the out-of-band noise power and the narrowband
  • the optical power of the optical signal can accurately obtain the optical signal-to-noise ratio.
  • Fig. 1 is the flow chart of the measurement method of optical signal to noise ratio provided by the embodiment of the present application
  • FIG. 2 is a schematic structural diagram of a measurement system for optical signal-to-noise ratio provided by an embodiment of the present application
  • FIG. 3 is a second structural schematic diagram of an optical signal-to-noise ratio measurement system provided in an embodiment of the present application.
  • the embodiment of the present application relates to a method for measuring optical signal-to-noise ratio, as shown in FIG. 1 , including:
  • Step 101 Obtain a narrowband optical signal, and use the narrowband optical signal to simulate the transmission of the service optical signal in the optical channel.
  • the bandwidth of the narrowband optical signal is such that the narrowband optical signal is not affected by the filtering effect and the service optical signal in the optical channel adjacent to the optical channel effects of crosstalk.
  • step 101 specifically includes: acquiring an optical signal through a light source; amplifying the optical power of the optical signal, so that the fiber input power of the optical signal is consistent with the fiber input power of the service optical signal; The frequency and bandwidth of the optical signal amplified by the optical power are adjusted to obtain a narrow-band optical signal.
  • the ultimate goal of the adjustment is to prevent the optical signal from filtering effects and crosstalk of service optical signals in optical channels adjacent to the optical channel. Influence.
  • the light source of the present application is applicable to two situations of being generated by an OTN network device and being generated by an external light source.
  • Step 102 acquire out-of-band noise power and optical power of the narrowband optical signal through the calibrated optical performance detection module.
  • step 102 before step 102, it also includes: acquiring a test optical signal, the true value of the central wavelength of the test optical signal is known, and the true value of the optical power of the test optical signal is known; through the optical performance detection module Obtain the measured value of the center wavelength and the measured value of the optical power of the test optical signal; obtain a calibration parameter according to the true value of the center wavelength and the measured value of the center wavelength, the true value of the optical power and the measured value of the optical power; The detection result of the optical performance detection module is calibrated.
  • the optical power detection accuracy and the center wavelength detection accuracy are calibrated to meet the actual requirements of the optical transmission network.
  • the optical power detection and center wavelength detection of the OPM will drift to a certain extent. Therefore, it must be calibrated to ensure the accuracy of detection.
  • test signals with different central wavelengths and different optical powers may be obtained multiple times, and then multiple calibration parameters may be obtained, and the final calibration parameters may be obtained by averaging the multiple calibration parameters.
  • the calibration parameters include center wavelength calibration parameters and optical power calibration parameters.
  • the detection results obtained by the optical performance detection module are calibrated by these two calibration parameters.
  • the wavelength of the test optical signal during calibration may be the ITU service wavelength or may not be the ITU service wavelength.
  • Step 103 calculate the signal-to-noise ratio of the optical channel according to the out-of-band noise power and the optical power.
  • step 103 specifically includes: interpolating the out-of-band noise of the narrow-band optical signal, and calculating the in-band noise power of the narrow-band optical signal according to the out-of-band noise power; Calculate the optical signal-to-noise ratio. That is to say, the in-band noise power can be easily obtained through the out-of-band noise power, and thus the optical signal-to-noise ratio can be calculated and obtained.
  • the formula for calculating the optical signal-to-noise ratio is:
  • P i is the optical signal power of the i-th channel, using the linear unit watts
  • N i is the ASE noise power measured within the noise equivalent bandwidth B m of the i-th channel, using the linear unit watts
  • B r is the reference light
  • the bandwidth usually 0.1nm or 12.5GHz (converted from 0.1nm in the C-band), is consistent with the B m unit.
  • This application proposes a measurement method for optical signal-to-noise ratio.
  • This method uses narrow-band optical signals to simulate the transmission of service optical signals in optical channels, and the narrow bandwidth of narrow-band optical signals makes it free from filtering effects and service light in adjacent optical channels.
  • the influence of signal crosstalk that is, the edge of the narrowband optical signal does not overlap with the edge of other service signals, so that the optical performance detection module after calibration can accurately obtain the out-of-band noise power of the narrowband optical signal, according to the out-of-band noise power and narrowband optical
  • the optical power of the signal can accurately obtain the optical signal-to-noise ratio.
  • the embodiment of the present application relates to a measurement system for optical signal-to-noise ratio, as shown in FIG. 2 , including:
  • the optical signal generating module 201 is configured to generate a narrowband optical signal through which an analog service optical signal is transmitted in an optical channel, and the bandwidth of the narrowband optical signal is such that the narrowband optical signal is free from filtering effects and is not compatible with the The influence of crosstalk of service optical signals in optical channels adjacent to optical channels;
  • the optical performance detection module 202 acquires the out-of-band noise power and optical power of the narrowband optical signal, and calculates the signal-to-noise ratio of the optical channel according to the out-of-band noise power and optical power.
  • the optical signal generation module 201 further includes: a light source 2011, a signal amplifier 2012, and a signal conditioner 2013; the light source 2011 is used to generate an optical signal; The power of the optical signal is amplified so that the fiber input power of the optical signal is consistent with the fiber input power of the service optical signal; the signal adjuster 2013 is used to adjust the frequency and bandwidth of the optical signal whose optical power has been amplified to obtain narrowband optical signal.
  • the light source 2011 may specifically be an optical amplifier or a single-wavelength tunable laser.
  • the signal conditioner 2013 may be a wavelength selector.
  • the optical amplifier may be an erbium-doped fiber amplifier or a Raman fiber amplifier or other types of optical amplifiers.
  • the measurement system may further include: a spectroscopic module 203 respectively connected to the optical signal generation module 201 and the optical performance detection module 202; the spectroscopic module 203 is used to obtain preset The narrowband signal light indicated by the splitting ratio is transmitted to the light performance detection module.
  • the optical splitting module 203 may be a wavelength-selectable filter, or an optical splitter without a wavelength-selective function. For example: when the optical splitting ratio is 1/99, the optical splitter can obtain one percent of the optical signal from the optical channel.
  • the optical signal includes narrow-band optical signals and other service optical signals. The out-of-band noise power of narrowband optical signals can be determined.
  • the position of the signal amplifier and the position of the signal adjuster can be interchanged, and this is only a specific embodiment, and the position of each component is not limited.
  • the erbium-doped fiber amplifier EDFA (1) is used as a light source to output a wide-spectrum signal light
  • the wavelength selector WSS can be used as a signal conditioner to perform wavelength and bandwidth of the wide-spectrum signal light Adjustment so that it is not affected by the filtering effect and the crosstalk of the service optical signal in the optical channel adjacent to the optical channel, that is, the edge of the broadband signal light does not overlap with the edge of the service optical signal in other optical channels, such as: narrow-band light
  • the parameters of the signal are 20Db spectral width less than 0.1nm, 12.5Ghz.
  • the erbium-doped fiber amplifier EDFA (2) is used as a signal amplifier to amplify the broadband signal light, so that the fiber input power of the broadband optical signal is consistent with that of the normal service optical signal, and finally a narrowband optical signal is obtained.
  • the wavelength-selectable filter is used as an optical splitting module, which selects the narrowband signal light from the optical channel according to the wavelength in the optical channel and transfers it to the optical performance detection module OPM.
  • An optical signal-to-noise ratio measurement system proposed in this application uses a narrow-band optical signal to simulate the transmission of a service optical signal in an optical channel, and the narrow bandwidth of the narrow-band optical signal prevents it from filtering effects and the service optical signal in an adjacent optical channel.
  • the influence of crosstalk that is, the edge of the narrowband optical signal does not overlap with the edge of other service signals, so that the calibrated optical performance detection module can accurately obtain the out-of-band noise power of the narrowband optical signal, according to the out-of-band noise power and the narrowband optical signal
  • the optical power can accurately obtain the optical signal-to-noise ratio.
  • this embodiment is a system embodiment corresponding to the embodiment of the method for measuring the optical signal-to-noise ratio, and this embodiment can be implemented in cooperation with the foregoing embodiments.
  • the relevant technical details mentioned in the foregoing embodiments are still valid in this embodiment, and will not be repeated here in order to reduce repetition.
  • the relevant technical details mentioned in this embodiment can also be applied to the above method embodiments.

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  • Electromagnetism (AREA)
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Abstract

本申请提出一种光信噪比的测量方法和系统，涉及光传送网技术领域。光信噪比的测量方法包括：获取窄带光信号，通过所述窄带光信号模拟业务光信号在光通道内传输，所述窄带光信号不受滤波效应和相邻光通道光信号串扰的影响；通过校准后的光性能检测模块获取所述窄带光信号的带外底噪和光功率；根据所述带外底噪和光功率计算光通道的信噪比。

Description

光信噪比的测量方法和系统
相关申请
本申请要求于2021年12月28日申请的、申请号为202111630817.3的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及光传送网技术领域，特别涉及一种光信噪比的测量方法和系统。
背景技术
OSNR(Optical Signal Noise Ratio，光信噪比)，用来描述光纤链路中ASE噪声(amplifier spontaneousemissionnoise，放大器自发辐射噪声)引起的信号损伤。由于OSNR与BER(Bit Error Ratio，比特出错率)相关，可通过实时监测的OSNR预判最终光网络的传输性能。OSNR准确监测的关键点在于带内底噪的测量。随着40G和100G系统的商用部署，一方面，受ROADM(Reconfigurable Optical Add-Drop Multiplexer，可重构光分插复用器)站点滤波效应和相邻通道串扰的影响，业务信号边缘重叠，使得带外底噪重叠，无法准确获得带外噪声功率，进而无法获取准确的带内噪声，最终导致OSNR测量的准确性受到影响。另一方面，如果链路中不存在业务信号，放大器的自发辐射噪声又无法准确替代存在业务信号时的带外底噪。因此，这种方法也无法准确获得带内底噪，进而无法进行准确的OSNR。
发明内容
本申请实施例的主要目的在于提出一种光信噪比的测量方法和系统，旨在获取更加准确的带外噪声功率，使得最终计算得到的信噪比准确度得到提高。
为实现上述目的，本申请实施例提供了一种光信噪比的测量方法，包括：获取窄带光信号，通过所述窄带光信号模拟业务光信号在光通道内传输，所述窄带光信号的带宽使得所述窄带光信号不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响；通过校准后的光性能检测模块获取所述窄带光信号的带外噪声功率和光功率；根据所述带外噪声功率和光功率计算光通道的信噪比。
为实现上述目的，本申请实施例还提出了一种光信噪比的测量系统，包括：
光信号产生模块，用于产生窄带光信号，通过所述窄带光信号模拟业务光信号在光通道内传输，所述窄带光信号不受滤波效应和相邻光通道业务光信号串扰的影响；
光性能检测模块，获取所述窄带光信号的带外噪声功率和光功率，并根据所述带外噪声功率和光功率计算光通道的信噪比。
本申请提出的一种光信噪比的测量方法和系统，采用窄带光信号模拟业务光信号在光通道内传输，而窄带光信号的窄带宽使得其不受滤波效应和相邻光通道中业务光信号串扰的影响，即窄带光信号的边缘不与其他业务信号的边缘重叠，如此通过校准后的光性能检测模块可以准确地获取窄带光信号的带外噪声功率，根据带外噪声功率和窄带光信号的光功率可以 准确获取光信噪比。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定。
图1是本申请的实施例提供的光信噪比的测量方法的流程图；
图2是本申请的实施例提供的光信噪比的测量系统的结构示意图一；
图3是本申请的实施方式提供的光信噪比的测量系统的结构示意图二。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请的各实施例进行详细的阐述。然而，本领域的普通技术人员可以理解，在本申请各实施例中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施例的种种变化和修改，也可以实现本申请所要求保护的技术方案。以下各个实施例的划分是为了描述方便，不应对本申请的具体实现方式构成任何限定，各个实施例在不矛盾的前提下可以相互结合相互引用。
本申请的实施例涉及一种光信噪比的测量方法，如图1所示，包括：
步骤101，获取窄带光信号，通过窄带光信号模拟业务光信号在光通道内传输，窄带光信号的带宽使得窄带光信号不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响。
在一实施例中，步骤101具体包括：通过光源获取光信号；将所述光信号的光功率进行放大，以使所述光信号的入纤功率与所述业务光信号的入纤功率一致；将光功率经过放大的光信号的频率和带宽进行调整，得到窄带光信号。需要说明的是，对光功率经过放大的光信号的波长和带宽进行调整时，调整的最终目标是使光信号不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响。另外，本申请的光源适用于由OTN网络器件产生和外置光源产生的两种情况。
步骤102，通过校准后的光性能检测模块获取窄带光信号的带外噪声功率和光功率。
在一实施例中，在步骤102之前，还包括：获取测试光信号，所述测试光信号的中心波长真实值已知，所述测试光信号的光功率真实值已知；通过光性能检测模块获取测试光信号的中心波长测量值和光功率测量值；根据所述中心波长真实值和所述中心波长测量值、所述光功率真实值和所述光功率测量值获取校准参数；根据校准参数对光性能检测模块的检测结果进行校准。
在本实施例中，光性能检测模块出厂时会校准光功率检测精度和中心波长检测精度，以满足光传送网络的实际需求。实际使用中，由于温度变化等影响，OPM的光功率检测和中心波长检测会产生一定漂移。因此必须对其进行校准，才能保证检测地准确性。
具体地说，在对光性能检测模块进行校准时，可多次获取不同中心波长和不同光功率的测试信号，然后获取多个校准参数，对多个校准参数进行平均获取最终的校准参数。需要说明的是，校准参数包括中心波长校准参数和光功率校准参数。通过这两个校准参数对光性能检测模块获取的检测结果进行校准。另外，在校准时测试光信号的波长可以是I TU业务波长， 也可以不是I TU业务波长。
步骤103，根据带外噪声功率和光功率计算光通道的信噪比。
本实施例中，步骤103具体包括：对所述窄带光信号的带外噪声进行插值，并根据带外噪声功率计算所述窄带光信号的带内噪声功率；根据所述带内噪声功率和光功率计算光信噪比。也就是说，通过带外噪声功率可以很容易地获取到带内噪声功率，由此即可计算获取光信噪比。具体地，光信噪比的计算公式为：
Figure PCTCN2022138488-appb-000001
其中，P i是第i个通道的光信号功率，使用线性单位瓦特；N i是第i个通道噪声等效带宽B m范围内测量的ASE噪声功率，使用线性单位瓦特；B r是参考光带宽，通常取0.1nm或者12.5GHz(C波段0.1nm换算而来)，与B m单位保持一致。
本申请提出的一种光信噪比的测量方法，本采用窄带光信号模拟业务光信号在光通道内传输，而窄带光信号的窄带宽使得其不受滤波效应和相邻光通道中业务光信号串扰的影响，即窄带光信号的边缘不与其他业务信号的边缘重叠，如此通过校准后的光性能检测模块可以准确地获取窄带光信号的带外噪声功率，根据带外噪声功率和窄带光信号的光功率可以准确获取光信噪比。
此外，应当理解的是，上面各种方法的步骤划分，只是为了描述清楚，实现时可以合并为一个步骤或者对某些步骤进行拆分，分解为多个步骤，只要包括相同的逻辑关系，都在本专利的保护范围内；对流程中添加无关紧要的修改或者引入无关紧要的设计，但不改变其流程的核心设计都在该专利的保护范围内。
本申请的实施例涉及一种光信噪比的测量系统，如图2所示，包括：
光信号产生模块201，用于产生窄带光信号，通过所述窄带光信号模拟业务光信号在光通道内传输，所述窄带光信号的带宽使得所述窄带光信号不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响；
光性能检测模块202，获取所述窄带光信号的带外噪声功率和光功率，并根据所述带外噪声功率和光功率计算光通道的信噪比。
在一实施例中，所述光信号产生模块201还包括：光源2011、信号放大器2012、信号调整器2013；所述光源2011用于产生光信号；所述信号放大器2012用于对所述光信号的功率进行放大，使得所述光信号的入纤功率与所述业务光信号的入纤功率一致；所述信号调整器2013用于对光功率经过放大的光信号的频率和带宽进行调整，获取窄带光信号。
另外，光源2011具体可以是光放大器或单波长可调谐激光器。信号调整器2013可以是波长选择器。在一实施例中，光放大器可以是掺铒光纤放大器或拉曼光纤放大器或其它类型的光放大器。
在一实施例中，所述测量系统还可以包括：分别连接所述光信号产生模块201和所述光性能检测模块202的分光模块203；所述分光模块203用于从光通道中获取预设的分光比所指示的窄带信号光，并传输至所述光性能检测模块。在一实施例中，分光模块203可以是波长可选择的滤波器，也可以是没有波长选择功能的分光器。比如：当分光比为1/99时，分光 器可以从光通道中获取百分之一的光信号，光信号中包括窄带光信号和其他业务光信号，光性能检测模块根据窄带光信号的波长可以确定窄带光信号的带外噪声功率。
需要说明的是，信号放大器的位置和信号调整器的位置可以互换，此处仅为一个具体的实施例，不对各器件的位置进行限定。
在一实施例中，如图3所示，掺铒光纤放大器EDFA(1)作为光源，输出一个宽谱信号光，波长选择器WSS作为信号调整器，可以对宽谱信号光的波长和带宽进行调整，使得不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响，即宽谱信号光的边缘不与其他光通道中业务光信号的边缘重叠，比如：窄带光信号的参数为20Db谱宽小于0.1nm，12.5Ghz。掺铒光纤放大器EDFA(2)作为信号放大器，用于将宽谱信号光进行放大，使得宽谱光信号的入纤功率与正常的业务光信号的入纤功率一致，最终得到窄带光信号。波长可选择的滤波器作为分光模块，根据光通道中的波长将窄带信号光从光通道中选择出来转送到光性能检测模块OPM。
本申请提出的一种光信噪比的测量系统，采用窄带光信号模拟业务光信号在光通道内传输，而窄带光信号的窄带宽使得其不受滤波效应和相邻光通道中业务光信号串扰的影响，即窄带光信号的边缘不与其他业务信号的边缘重叠，如此通过校准后的光性能检测模块可以准确地获取窄带光信号的带外噪声功率，根据带外噪声功率和窄带光信号的光功率可以准确获取光信噪比。
不难发现，本实施例为与光信噪比的测量方法实施例相对应的系统实施例，本实施例可与上述实施例互相配合实施。上述实施例中提到的相关技术细节在本实施例中依然有效，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在上述方法实施例中。
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (10)

  1. 一种光信噪比的测量方法，包括：
    获取窄带光信号，通过所述窄带光信号模拟业务光信号在光通道内传输，所述窄带光信号的带宽使得所述窄带光信号不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响；
    通过校准后的光性能检测模块获取所述窄带光信号的带外噪声功率和光功率；
    根据所述带外噪声功率和光功率计算光通道的信噪比。
  2. 根据权利要求1所述的光信噪比的测量方法，其中，所述获取窄带光信号，包括：
    通过光源获取光信号；
    将所述光信号的光功率进行放大，以使所述光信号的入纤功率与所述业务光信号的入纤功率一致；
    将光功率经过放大的光信号的波长和带宽进行调整，得到窄带光信号。
  3. 根据权利要求1所述的光信噪比的测量方法，其中，所述通过校准后的光性能监测模块获取所述窄带光信号的带外噪声功率和光功率之前，还包括：
    获取测试光信号，所述测试光信号的中心波长真实值已知，所述测试光信号的光功率真实值已知；
    通过光性能检测模块获取测试光信号的中心波长测量值和光功率测量值；
    根据所述中心波长真实值和所述中心波长测量值、所述光功率真实值和所述光功率测量值获取校准参数；
    根据校准参数对光性能检测模块的检测结果进行校准。
  4. 根据权利要求1所述的光信噪比的测量方法，其中，所述根据所述带外噪声功率和光功率计算光通道的信噪比，包括：
    对所述窄带光信号的带外噪声进行插值，并根据带外噪声功率计算所述窄带光信号的带内噪声功率；
    根据所述带内噪声功率和光功率计算光信噪比。
  5. 一种光信噪比的测量系统，包括：
    光信号产生模块，设置为产生窄带光信号，通过所述窄带光信号模拟业务光信号在光通道内传输，所述窄带光信号的带宽使得所述窄带光信号不受滤波效应和与所述光通道相邻的光通道中业务光信号串扰的影响；
    光性能检测模块，获取所述窄带光信号的带外噪声功率和光功率，并根据所述带外噪声功率和光功率计算光通道的信噪比。
  6. 根据权利要求5所述的光信噪比的测量系统，其中，所述光信号产生模块包括：光源、信号放大器、信号调整器；
    所述光源设置为产生光信号；
    所述信号放大器设置为对所述光信号的功率进行放大，使得所述光信号的入纤功率与所述业务光信号的入纤功率一致；
    所述信号调整器设置为对光功率经过放大的光信号的波长和带宽进行调整，获取窄带光信号。
  7. 根据权利要求6中所述的光信噪比的测量系统，其中，所述光源为光放大器或单波长可调谐激光器。
  8. 根据权利要求6中所述的光信噪比的测量系统，其中，所述信号调整器为波长选择器。
  9. 根据权利要求5中所述的光信噪比的测量系统，其中，所述系统还包括：分别连接所述光信号产生模块和所述光性能检测模块的分光模块；
    所述分光模块用于从光通道中获取预设的分光比所指示的窄带信号光，并传输至所述光性能检测模块。
  10. 根据权利要求9中所述的光信噪比的测量系统，其中，所述分光模块为分光器或波长可选择的滤波器。
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