WO2013113208A1 - 波分复用系统的光信噪比监测装置及方法 - Google Patents

波分复用系统的光信噪比监测装置及方法 Download PDF

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Publication number
WO2013113208A1
WO2013113208A1 PCT/CN2012/078693 CN2012078693W WO2013113208A1 WO 2013113208 A1 WO2013113208 A1 WO 2013113208A1 CN 2012078693 W CN2012078693 W CN 2012078693W WO 2013113208 A1 WO2013113208 A1 WO 2013113208A1
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wavelength
signal
division multiplexing
multiplexing system
osnr
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PCT/CN2012/078693
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English (en)
French (fr)
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沈百林
华锋
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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
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0775—Performance monitoring and measurement of transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0272—Transmission of OAMP information
    • H04J14/0275—Transmission of OAMP information using an optical service channel

Definitions

  • the present invention relates to optical communication technologies, and in particular, to an optical signal-to-noise ratio (OSNR) monitoring apparatus and method for a wavelength division multiplexing system.
  • OSNR optical signal-to-noise ratio
  • the optical signal to noise ratio (OSNR) of the wavelength division multiplexing system is a key parameter to measure the transmission performance of the wavelength division system. It is defined as the signal power of the channel divided by the noise power in the O.lnm at the signal wavelength. As the single-wavelength rate of WDM systems moves to 40 Gb/s and above, OSNR monitoring becomes more and more difficult.
  • the traditional method is implemented by interpolation, that is, firstly, the noise power outside the signal light is monitored, and then the interpolation power is used to obtain the noise power at the signal wavelength, and finally the OSNR is calculated.
  • the interpolation method can well satisfy the OSNR monitoring of 2.5Gb/s and 10Gbit/s WDM systems, because the spectral width of the 10Gb/s signal is much smaller than the system channel spacing, and there is enough spectral space to measure the phase.
  • Noise power between adjacent signals, the optical performance module (OPM) of the current wavelength division multiplexing system uses spectral scanning technology to scan the optical language in the working wavelength range, thereby obtaining channel power and channel
  • the noise power is then interpolated to obtain the noise power at the signal wavelength, and the OSNR is calculated.
  • the interpolation method is no longer applicable.
  • the signal width of 40Gb/s and above is large, close to the channel spacing.
  • the noise power between the channels cannot be accurately measured by interpolation, so the noise power at the signal wavelength cannot be obtained.
  • the accurate OSNR monitoring is also impossible. Start.
  • the existing wavelength division multiplexing system may include a wavelength label loading unit, and the topping technology related to the wavelength labeling technology is introduced as follows:
  • a pilot tone signal is loaded for each wavelength, which can realize multiple A special application, which has been studied in the industry.
  • the topping signal is sometimes called the low-frequency dither signal, and the effect of the wavelength signal loading the topping signal on the transmission performance is almost negligible.
  • the modulating signal implements the acknowledgment and power management of the wavelength channels required for fault management in the wavelength division multiplexing system.
  • Embodiments of the present invention provide an optical signal-to-noise ratio (OSNR) monitoring apparatus and method for a wavelength division multiplexing system to solve the OSNR monitoring problem of the existing high-speed wavelength division multiplexing system.
  • OSNR optical signal-to-noise ratio
  • the OSNR monitoring apparatus of the wavelength division multiplexing system of the embodiment of the present invention includes a wavelength label analysis unit, an optical performance monitoring unit, and an OSNR calculation unit, wherein:
  • the wavelength label analyzing unit is configured to: receive a monitoring optical signal provided by the wavelength division multiplexing system, obtain a signal power of a channel where each wavelength signal in the monitoring optical signal is located, and
  • An OSNR calculation unit transmits the signal power
  • the optical performance monitoring unit is configured to: receive the monitoring optical signal provided by the wavelength division multiplexing system, obtain total power of a channel where each wavelength signal in the monitoring optical signal is located, and send the total power to the OSNR calculation unit The total power;
  • the OSNR calculation unit is configured to: obtain an OSNR of the wavelength division multiplexing system according to signal power and total power of each channel transmitted by the wavelength label analysis unit and the optical performance monitoring unit.
  • the monitoring optical signal is a partial optical signal that is separated from the main optical signal by the wavelength division multiplexing system; the OSNR calculating unit is configured to: according to the obtained signal power and total of each channel The OSNR of the wavelength division multiplexing system is calculated from the power and the corresponding split ratio.
  • the OSNR device is located on a trunk fiber of the wavelength division multiplexing system; or the OSNR device is located on a network element of the wavelength division multiplexing system.
  • the wavelength label analysis unit is configured to: obtain, by using a digital signal processing technique, an amplitude of a wavelength label carried by each wavelength signal in the monitoring optical signal, and derive a signal corresponding to the channel according to the amplitude of the wavelength label. power.
  • the primary optical signal comprises a wavelength signal after the wavelength label loading unit of the wavelength division multiplexing system loads the wavelength label.
  • the wavelength label loading unit is located between the transmitting portion of the optical forwarding unit of the transmitting end of the wavelength division multiplexing system and the optical multiplexing unit; or the wavelength label loading unit is located at the transmitting end of the wavelength division multiplexing system. Between the transmitting portion of the optical forwarding unit and the optical add/drop multiplexing unit.
  • the OSNR of the wavelength division multiplexing system is obtained based on the signal power and total power of each channel.
  • the monitoring optical signal is a part of the wavelength division multiplexing system that is separated from the main optical signal Optical signal
  • the step of obtaining the OSNR of the wavelength division multiplexing system according to the signal power and the total power of each channel includes:
  • the OSNR of the wavelength division multiplexing system is calculated based on the obtained signal power and total power of each channel and the corresponding split ratio.
  • the primary optical signal comprises a wavelength signal after the wavelength label loading unit of the wavelength division multiplexing system loads the wavelength label.
  • the step of obtaining the signal power of the channel where each wavelength signal in the monitoring optical signal is located includes: obtaining, by using a digital signal processing technique, an amplitude of a wavelength label carried by each wavelength signal in the monitoring optical signal, according to The amplitude of the wavelength label is derived from the signal power of the corresponding channel.
  • the OSNR monitoring device and method of the above wavelength division multiplexing system realizes OSNR monitoring of the high speed wavelength division multiplexing system by combining the wavelength labeling technology and the traditional OPM technology.
  • Figure 1 is a block diagram showing an embodiment of an OSNR monitoring apparatus of a wavelength division multiplexing system according to the present invention
  • Figure 2 is a flow chart showing an embodiment of an OSNR monitoring method of a wavelength division multiplexing system according to the present invention.
  • the embodiment of the invention utilizes the combination of the wavelength label technology and the traditional OPM technology to realize the OSNR monitoring of the high-speed wavelength division multiplexing system
  • the wavelength label technology can refer to the Chinese postal industry standard YD/T 2003-2009 "reconfigurable light distribution"
  • Appendix D of Plug-and-Relay (ROADM) Equipment Technical Requirements describes wavelength trace monitoring (wavelength labeling) technology in ROADM applications.
  • the encoder is modulated and encoded before the wavelength signal enters the WDM network, and a unique identifier (wavelength label) of the entire network is attached to each wavelength signal; each reference point of each node passing through the wavelength path
  • the embedded wavelength tag detector can be used to monitor and identify the point passing through the point. Labels for each wavelength.
  • An embodiment of the present invention provides an optical signal-to-noise ratio (OSNR) monitoring apparatus for a wavelength division multiplexing system, where the apparatus includes a wavelength label analysis unit, an optical performance monitoring unit, and an OSNR calculation unit, where: the wavelength label analysis unit is configured. And receiving the monitoring optical signal provided by the wavelength division multiplexing system, obtaining signal power of a channel where each wavelength signal of the monitoring optical signal is located, and transmitting the signal power to the OSNR calculation unit;
  • OSNR optical signal-to-noise ratio
  • the optical performance monitoring unit is configured to: receive the monitoring optical signal provided by the wavelength division multiplexing system, obtain total power of a channel where each wavelength signal in the monitoring optical signal is located, and send the total power to the OSNR calculation unit The total power;
  • the OSNR calculation unit is configured to: obtain an OSNR of the wavelength division multiplexing system according to signal power and total power of each channel transmitted by the wavelength label analysis unit and the optical performance monitoring unit.
  • FIG. 1 is a block diagram of a single-fiber unidirectional one of the existing wavelength division multiplexing systems, including optical forwarding units 11, 12, 13, 14, 15, and 16; Photosynthetic wave unit 21; optical add/drop multiplexing unit 22; optical demultiplexing unit 23; optical amplifying units 31 and 32; transmission optical fibers 81, 82, 83, 84; wavelength label loading units 41, 42 and 43;
  • the OSNR monitoring device for implementing the high speed wavelength division multiplexing system includes: a wavelength label analyzing unit 51; an optical performance monitoring unit 61; an OSNR calculating unit 71, wherein:
  • the wavelength label loading unit 41 is located between the transmitting portion 11 of the transmitting end optical forwarding unit and the optical multiplexing unit 21, and the wavelength label loading unit 43 is located between the transmitting portion 15 of the transmitting end optical forwarding unit and the add/drop multiplexing unit 22, and the optical signal
  • the wavelength label loading unit loads a unique label information, and the wavelength label loading unit uses the topping technology.
  • the topping technology does not affect the transmission performance of the optical signal, and the modulation depth is small, for example, 1% to 8%.
  • the mode or scaling mode locks the modulation depth to a fixed value; Figure 1 shows only three wavelength channels exemplarily.
  • the OSNR monitoring point shown in Figure 1 is located before the optical demultiplexing unit 23, and is for illustrative purposes only.
  • the OSNR monitoring point can be located in any network element of the wavelength division multiplexing system, and respectively separate a small portion of the optical signal from the main optical signal, for example, 1% or 5% or other suitable value, as the monitoring optical signal input to the wavelength label analyzing unit. 51 and optical performance monitoring unit 61.
  • the wavelength label analysis unit 51 uses digital signal processing techniques such as frequency modulation Z conversion (Chirped Z Transform, CZT) or Fast Fourier Transform (FFT) and other frequency analysis methods, the frequency and amplitude of the wavelength label are obtained. Because the modulation depth of the wavelength label at the transmitting end is known, the monitoring light can be derived proportionally. The signal power of each channel in the signal.
  • digital signal processing techniques such as frequency modulation Z conversion (Chirped Z Transform, CZT) or Fast Fourier Transform (FFT) and other frequency analysis methods, the frequency and amplitude of the wavelength label are obtained. Because the modulation depth of the wavelength label at the transmitting end is known, the monitoring light can be derived proportionally. The signal power of each channel in the signal.
  • the optical performance monitoring unit 61 scans the spectrum of the entire wavelength working range to obtain the total power of each channel in the monitoring optical signal.
  • the optical performance monitoring unit is mature in technology and can be used in existing OPM commercial products.
  • the OSNR calculating unit 71 calculates the OSNR of each channel based on the data information supplied from the wavelength tag unit 51 and the optical performance monitoring unit 61. First, consider the splitting ratio factor to obtain the signal power and total power of each channel in the main optical signal; secondly, the total power minus the signal power is the noise power; then calculate the OSNR of each channel according to the OSNR definition.
  • the OSNR monitoring method for implementing the wavelength division multiplexing system by using the above OSNR monitoring device includes the following steps:
  • Step A receiving a monitoring optical signal provided by the wavelength division multiplexing system
  • the monitoring optical signal is a partial optical signal that is separated from the main optical signal by the wavelength division multiplexing system; and the main optical signal includes a wavelength signal after the wavelength label loading unit of the wavelength division multiplexing system loads the wavelength label. ;
  • Step B respectively obtaining signal power and total power of a channel where each wavelength signal in the monitoring optical signal is located;
  • the wavelength signal technique is used to measure the signal power of each channel and the spectral scanning technique is used to measure the total power of each channel;
  • Step C Obtain the OSNR of the wavelength division multiplexing system based on the signal power and total power of each channel.
  • the method includes: Step 201: Using a wavelength label technology to measure signal power of each channel;
  • the wavelength label analyzing unit 51 receives a small portion of the optical signal separated by the main optical signal as a monitoring optical signal, and analyzes the wavelength label information by using a digital signal processing technique to obtain a signal power p s of each channel in the monitoring optical signal ( ).
  • Step 202 Measure a total power of each channel by using a spectral scanning technique;
  • the optical performance monitoring unit 61 receives a small portion of the optical signal separated by the main optical signal as a monitoring optical signal, and scans the spectrum to obtain a total power p c ( ) of each channel in the monitored optical signal.
  • Step 203 Calculate OSNR by using signal power and total power.
  • the OSNR monitoring apparatus and method described above implement OSNR monitoring of a high-speed wavelength division multiplexing system in the optical domain; the interpolation method in the prior art cannot be applied to a wavelength division multiplexing system of 40 Gb/s or more, and the polarization extinction method cannot be used in the prior art.
  • the wavelength division multiplexing system suitable for polarization multiplexing, the invention combines the existing optical performance monitoring technology (OPM) based on the wavelength label technology to solve the technical problem that the OPM cannot be monitored by the existing OPM alone, compared with the polarization extinction method. With outstanding advantages of simple implementation and low cost.
  • the OSNR monitoring device and method of the above wavelength division multiplexing system realizes OSNR monitoring of the high speed wavelength division multiplexing system by combining the wavelength labeling technology and the traditional OPM technology.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

波分复用系统的OSNR监测装置及方法，该装置包括波长标签分析单元、光性能监测单元和OSNR计算单元，其中：波长标签分析单元接收波分复用系统提供的监测光信号，获得监测光信号中每个波长信号所在通道的信号功率，并向OSNR计算单元发送信号功率；光性能监测单元接收波分复用系统提供的监测光信号，获得监测光信号中每个波长信号所在通道的总功率，并向OSNR计算单元发送总功率；OSNR计算单元根据波长标签分析单元和光性能监测单元发送的每个通道的信号功率和总功率获得波分复用系统的OSNR。

Description

波分复用系统的光信噪比监测装置及方法
技术领域
本发明涉及光通信技术，尤其涉及一种波分复用系统的光信噪比（ OSNR ) 监测装置及方法。
背景技术
波分复用系统的光信噪比（ Optical Signal to Noise Ratio, OSNR )是衡量 波分系统传输性能的关键参数，定义为通道的信号功率除以信号波长处 O.lnm 内的噪声功率。 随着波分复用系统单波速率向 40Gb/s及以上发展， OSNR的 监测越来越困难。 传统方法釆用内插法实现， 即首先监测信号光语之外的噪 声功率， 然后再用内插公式得到信号波长处的噪声功率， 最后计算出 OSNR。 内插法可以很好地满足单波速率为 2.5Gb/s和 10Gbit/s波分复用系统的 OSNR 监测， 因为 10Gb/s信号的光谱宽度远小于系统通道间隔， 有足够的光谱空间 测量相邻信号之间噪声功率， 当前波分复用系统商用的光性能监测单元 ( Optical performance module, OPM )釆用光谱扫描技术， 扫描出工作波长范 围内的光语， 从而得到通道功率和通道间的噪声功率， 再釆用内插法得出信 号波长处的噪声功率， 从而计算得出 OSNR。 但如果波分复用系统中有多级 光滤波器， 通道间的噪声不能反映出信号波长处的噪声， 这种情况下内插法 不再适用。 40Gb/s及以上速率的信号光谱宽度大， 接近于通道间隔， 用内插 法也无法准确测量到通道间的噪声功率， 所以也无法得到信号波长处的噪声 功率， 准确的 OSNR监测也无从谈起。
近年来， 一种新方法即偏振消光法的 OSNR监测技术也已成功商用， 原 理是利用信号偏振、 噪声非偏振的特性实现信号和噪声的分离计算， 从而实 现 OSNR的监测， 这种方法适用于 40Gb/s非相干接收系统及 10Gb/s直接探 测系统。 偏振消光法实现原理非常复杂， 成本较高， 目前仅仅是仪表级商用， 尚未见到基于偏振消光法的系统模块级商用。 但如果是偏振复用系统， 无法 用偏振消光的机制分离出信号和噪声， 因而无法用偏振消光法监测 OSNR。 OSNR监测的内插法和偏振消光法的具体实现原理在国际电信联盟颁布的 G.697建议的附录 III中有详细描述。 部分 40Gb/s波分传输釆用偏振复用 +相 技术， 无法釆用内插法和偏振消光法监测高速波分复用系统的 OSNR, 因此 高速波分复用系统的 OSNR监测成为业界亟待解决的技术难题。
现有的波分复用系统可以包括波长标签加载单元， 波长标签技术涉及到 的调顶技术介绍如下： 波分复用系统中为每个波长加载一个调顶 （ pilot tone ) 信号， 可以实现多种特殊的应用， 这在业界早有研究。 调顶信号有时也叫低 频微扰 ( low-frequency dither )信号， 波长信号加载调顶信号对传输性能的影 响几乎可以忽略不计。 例如 1993年英国 BT实验室、 瑞典 Ericsson等多家单 位在光波技术学报上联合发表的"一种基于光网络网元的传送网络层 （A transport network layer based on optical network elements ) ", 提出了利用调顶 信号实现波分复用系统中故障管理所需的波长通道的确认和功率管理。 还有 1994年加拿大 Nortel公司的 Kim B. Roberts申请的专利"光传输系统的性能监 测的方法和装置 ( method and apparatus for monitoring performance of optical transmission systems ) "； 还提出了公开号为 US 005513029的专利申请 "一种 监测光放大器性能的方法" ， 即监测已知调制深度的调顶信号， 实现光放大 器的信号和噪声分量的预估。 此外还有 1996 年美国贝尔实验室的 Fred Heismann等人在 ECOC'96会议上发表的 "多波长光网络的信号跟踪和性能监 测 ( signal tracking and performance monitoring in multi-wavelength optical networks ) ", 论文编号为 WeB2.2, 公开了一种波分复用网络实现在线式波长 路由跟踪的方案， 即每个波长调制一个独一无二的调顶信号， 并通过频移键 控方式进行数字信息的编码， 在光网络中的任意站点监测调顶信号， 从而可 以获知全网的波长路由信息。 发明内容
本发明实施例提供了一种波分复用系统的光信噪比 ( OSNR )监测装置及 方法， 以解决现有的高速波分复用系统的 OSNR监测问题。
本发明实施例的波分复用系统的 OSNR监测装置包括波长标签分析单 元、 光性能监测单元和 OSNR计算单元， 其中： 所述波长标签分析单元设置为： 接收所述波分复用系统提供的监测光信 号， 获得所述监测光信号中每个波长信号所在通道的信号功率， 并向所述
OSNR计算单元发送所述信号功率；
所述光性能监测单元设置为： 接收所述波分复用系统提供的所述监测光 信号， 获得所述监测光信号中每个波长信号所在通道的总功率， 并向所述 OSNR计算单元发送所述总功率；
所述 OSNR计算单元设置为： 根据所述波长标签分析单元和所述光性能 监测单元发送的每个通道的信号功率和总功率获得所述波分复用系统的 OSNR。
优选地， 所述监测光信号为所述波分复用系统从主光信号中分出的部分 光信号； 所述 OSNR计算单元是设置为： 根据获得的所述每个通道的信号功 率和总功率以及对应的分光比， 计算出所述波分复用系统的 OSNR。
优选地， 所述 OSNR装置位于所述波分复用系统的主干光纤上； 或者， 所述 OSNR装置位于所述波分复用系统的网元上。
优选地， 所述波长标签分析单元是设置为： 利用数字信号处理技术获得 所述监测光信号中每个波长信号所携带的波长标签的幅度， 根据所述波长标 签的幅度推算出对应通道的信号功率。
优选地， 所述主光信号包括所述波分复用系统的波长标签加载单元加载 波长标签后的波长信号。
优选地， 所述波长标签加载单元位于所述波分复用系统发送端光转发单 元的发送部分和光合波单元之间； 或者， 所述波长标签加载单元位于所述波 分复用系统发送端光转发单元的发送部分和光分插复用单元之间。
本发明实施例的波分复用系统的 OSNR监测方法包括：
接收所述波分复用系统提供的监测光信号；
分别获得所述监测光信号中每个波长信号所在通道的信号功率和总功 率；
根据每个通道的信号功率和总功率获得所述波分复用系统的 OSNR。 优选地， 所述监测光信号为所述波分复用系统从主光信号中分出的部分 光信号；
所述根据每个通道的信号功率和总功率获得所述波分复用系统的 OSNR 的步骤包括：
根据获得的所述每个通道的信号功率和总功率以及对应的分光比， 计算 出所述波分复用系统的 OSNR。
优选地， 所述主光信号包括所述波分复用系统的波长标签加载单元加载 波长标签后的波长信号。
优选地， 所述获得所述监测光信号中每个波长信号所在通道的信号功率 的步骤包括： 利用数字信号处理技术获得所述监测光信号中每个波长信号所 携带的波长标签的幅度， 根据所述波长标签的幅度推算出对应通道的信号功 率。
上述波分复用系统的 OSNR监测装置及方法， 利用波长标签技术和传统 的 OPM技术相结合实现了高速波分复用系统的 OSNR监测。
附图概述 图 1是本发明波分复用系统的 OSNR监测装置实施例的结构示意图； 图 2是本发明波分复用系统的 OSNR监测方法实施例的流程图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互任意组合。
本发明实施例利用波长标签技术和传统的 OPM技术相结合实现高速波 分复用系统的 OSNR监测， 其中， 波长标签技术可参考中国邮电行业标准 YD/T 2003-2009 "可重构的光分插复用 （ ROADM)设备技术要求" 的附录 D, 介绍了 ROADM应用中的波长踪迹监控（波长标签）技术。 在波长路径的源 端点， 在波长信号进入波分网络之前使用编码器进行调制编码， 为每个波长 信号附加一个全网唯一的标识（波长标签） ； 在波长路径经过的各个节点的 各个参考点上， 都可以通过嵌入的波长标签检测器来监测和识别经过该点的 各个波长的标签。
本发明实施例提供了一种波分复用系统的光信噪比 （OSNR )监测装置， 该装置包括波长标签分析单元、 光性能监测单元和 OSNR计算单元， 其中： 所述波长标签分析单元设置为： 接收所述波分复用系统提供的监测光信 号， 获得所述监测光信号中每个波长信号所在通道的信号功率， 并向所述 OSNR计算单元发送所述信号功率；
所述光性能监测单元设置为： 接收所述波分复用系统提供的所述监测光 信号， 获得所述监测光信号中每个波长信号所在通道的总功率， 并向所述 OSNR计算单元发送所述总功率；
所述 OSNR计算单元设置为： 根据所述波长标签分析单元和所述光性能 监测单元发送的每个通道的信号功率和总功率获得所述波分复用系统的 OSNR。
下面以具体实施例为例介绍 OSNR监测装置的结构， 图 1中给出了现有 波分复用系统单纤单向的框图， 包括光转发单元 11、 12、 13、 14、 15、 16; 光合波单元 21 ; 光分插复用单元 22; 光分波单元 23; 光放大单元 31和 32; 传输光纤 81、 82、 83、 84; 波长标签加载单元 41、 42和 43; 本发明所述的 实现高速波分复用系统的 OSNR监测装置包括： 波长标签分析单元 51 ; 光性 能监测单元 61 ; OSNR计算单元 71 , 其中：
波长标签加载单元 41位于发送端光转发单元的发送部分 11和光合波单 元 21之间，波长标签加载单元 43位于发送端光转发单元的发送部分 15和分 插复用单元 22之间，光信号经过波长标签加载单元时就加载一个独特的标签 信息， 波长标签加载单元釆用调顶技术， 调顶技术不影响光信号的传输性能， 调制深度很小， 例如 1%~8%, 釆用反馈方式或定标方式使得调制深度锁定在 某个固定值； 图 1仅示例性地给出了 3个波长通道。
图 1给出的 OSNR监测点位于光分波单元 23之前， 仅用于示例性说明，
OSNR监测点可位于波分复用系统的任意网元， 分别从主光信号中分出一小 部分光信号， 例如 1%或 5%或其他合适值， 作为监测光信号输入给波长标签 分析单元 51和光性能监测单元 61。
波长标签分析单元 51釆用数字信号处理技术，例如调频 Z变换 (Chirped Z Transform, CZT)或快速傅里叶变换 (Fast Fourier Transform, FFT)等频率分析 方法， 得到波长标签的频率和幅度， 因为发送端波长标签的调制深度是已知 的， 可以按比例推算出监测光信号中每个通道的信号功率。
光性能监测单元 61扫描出整个波长工作范围的光谱，可以得到监测光信 号中每个通道的总功率。光性能监测单元技术成熟，可釆用现有 OPM商用产 口 。
OSNR计算单元 71根据波长标签单元 51和光性能监测单元 61提供的数 据信息计算出每个通道的 OSNR。 首先考虑分光比因素得到主光信号中每个 通道的信号功率和总功率； 其次总功率减去信号功率即为噪声功率； 再才艮据 OSNR定义计算出每个通道的 OSNR。
利用上述 OSNR监测装置实现波分复用系统的 OSNR监测方法包括以下 步骤：
步骤 A. 接收所述波分复用系统提供的监测光信号；
所述监测光信号为所述波分复用系统从主光信号中分出的部分光信号； 所述主光信号包括所述波分复用系统的波长标签加载单元加载波长标签后的 波长信号；
步骤 B. 分别获得所述监测光信号中每个波长信号所在通道的信号功率 和总功率；
分别利用波长标签技术测量每个通道的信号功率以及利用光谱扫描技术 测量每个通道的总功率；
步骤 C. 根据每个通道的信号功率和总功率获得所述波分复用系统的 OSNR。
下面以具体实施例为例介绍 OSNR监测方法，如图 2所示，该方法包括： 步骤 201、 利用波长标签技术测量每个通道的信号功率；
具体地，波长标签分析单元 51接收主光信号分离出的一小部分光信号作 为监测光信号， 釆用数字信号处理技术分析波长标签信息， 得到监测光信号 中每个通道的信号功率 ps( )。 步骤 202、 利用光谱扫描技术测量每个通道的总功率；
光性能监测单元 61 接收主光信号分离出的一小部分光信号作为监测光 信号， 扫描出光谱， 得到监测光信号中每个通道的总功率 pc( )。
步骤 203、 利用信号功率和总功率计算出 OSNR。
首先考虑到分光比，从监测光信号的 ps( )和 pc 分别计算出主光信号中 信号功率 ps( ）和总功率 pc( ）。 然后计算出通道内的噪声功率，
Figure imgf000009_0001
再折算出 O.lnm内的噪声功率， 例如通道带宽为 B(nm), 则 O.lnm 内 的噪声 功率 PN( )= 0.1 χΡΝο(λ /Β； 最后根据公式 OSNR( )=l( oglO(Ps/PN)得出 OSNR。
上述 OSNR监测装置及方法， 在光域实现了高速波分复用系统 OSNR监 测； 现有技术中内插法无法适用于 40Gb/s及以上波分复用系统， 现有技术中 偏振消光法无法适用于偏振复用的波分复用系统， 本发明在波长标签技术的 基础上结合现有光性能监测技术（OPM )解决了单纯依靠现有 OPM无法监 测 OSNR的技术难题， 相对于偏振消光法， 具有实现简单、 成本低的突出优 势。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 上述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上实施例仅用以说明本发明的技术方案而非限制， 仅仅参照较佳实施 例对本发明进行了详细说明。 本领域的普通技术人员应当理解， 可以对本发 明的技术方案进行修改或者等同替换， 而不脱离本发明技术方案的精神和范 围， 均应涵盖在本发明的权利要求范围当中。
工业实用性
上述波分复用系统的 OSNR监测装置及方法， 利用波长标签技术和传统 的 OPM技术相结合实现了高速波分复用系统的 OSNR监测。

Claims

权 利 要 求 书
1、 一种波分复用系统的光信噪比 （OSNR )监测装置， 该装置包括波长 标签分析单元、 光性能监测单元和 OSNR计算单元， 其中：
所述波长标签分析单元设置为： 接收所述波分复用系统提供的监测光信 号， 获得所述监测光信号中每个波长信号所在通道的信号功率， 并向所述 OSNR计算单元发送所述信号功率；
所述光性能监测单元设置为： 接收所述波分复用系统提供的所述监测光 信号， 获得所述监测光信号中每个波长信号所在通道的总功率， 并向所述 OSNR计算单元发送所述总功率；
所述 OSNR计算单元设置为： 根据所述波长标签分析单元和所述光性能 监测单元发送的每个通道的信号功率和总功率获得所述波分复用系统的 OSNR。
2、 根据权利要求 1所述的装置， 其中：
所述监测光信号为所述波分复用系统从主光信号中分出的部分光信号； 所述 OSNR计算单元是设置为根据获得的所述每个通道的信号功率和总 功率以及对应的分光比， 计算出所述波分复用系统的 OSNR。
3、 根据权利要求 2所述的装置， 其中：
所述 OSNR装置位于所述波分复用系统的主干光纤上； 或者
所述 OSNR装置位于所述波分复用系统的网元上。
4、 根据权利要求 1-3任一权利要求所述的装置， 其中：
所述波长标签分析单元是设置为利用数字信号处理技术获得所述监测光 信号中每个波长信号所携带的波长标签的幅度， 根据所述波长标签的幅度推 算出对应通道的信号功率。
5、 根据权利要求 2所述的装置， 其中：
所述主光信号包括所述波分复用系统的波长标签加载单元加载波长标签 后的波长信号。
6、 根据权利要求 5所述的装置， 其中：
所述波长标签加载单元位于所述波分复用系统发送端光转发单元的发送 部分和光合波单元之间； 或者
所述波长标签加载单元位于所述波分复用系统发送端光转发单元的发送 部分和光分插复用单元之间。
7、 一种波分复用系统的光信噪比 （OSNR )监测方法， 该方法包括： 接收所述波分复用系统提供的监测光信号；
分别获得所述监测光信号中每个波长信号所在通道的信号功率和总功 率； 以及
根据每个通道的信号功率和总功率获得所述波分复用系统的 OSNR。
8、 根据权利要求 7所述的方法， 其中：
所述监测光信号为所述波分复用系统从主光信号中分出的部分光信号； 所述根据每个通道的信号功率和总功率获得所述波分复用系统的 OSNR 的步骤包括：
根据获得的所述每个通道的信号功率和总功率以及对应的分光比， 计算 出所述波分复用系统的 OSNR。
9、 根据权利要求 8所述的方法， 其中：
所述主光信号包括所述波分复用系统的波长标签加载单元加载波长标签 后的波长信号。
10、 根据权利要求 7-9任一权利要求所述的方法， 其中：
所述获得所述监测光信号中每个波长信号所在通道的信号功率的步骤包 括：
利用数字信号处理技术获得所述监测光信号中每个波长信号所携带的波 长标签的幅度， 根据所述波长标签的幅度推算出对应通道的信号功率。
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