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1. 发明授权

US5969834A Method and apparatus for monitoring wavelength multiplexed optical signals 失效
标题翻译：用于监测波长复用光信号的方法和装置
公开(公告)号：US5969834A
公开(公告)日：1999-10-19
申请号：US922295
申请日：1997-09-03
申请人： Gennady I. Farber , Salim N. Jabr , Edward A. Vetter , Victor A. Zeyliger
发明人： Gennady I. Farber , Salim N. Jabr , Edward A. Vetter , Victor A. Zeyliger
IPC分类号： H04B10/08
CPC分类号： H04B10/071
摘要： One method of determining the signal to noise ratio of an optical signal models the noise floor based on amplified spontaneous emission (ASE) which is accumulated along the link. The ASE wavelength dependence is represented by a known mathematical function with a limited number of parameters. The parameters of this function are derived from measurements of the noise floor at a limited number of points by computational best fit means. A number of fiber grating filters at wavelengths between ITU allocated wavelengths are used to sample the optical noise and reflect the light back. An optical circulator is used to direct the reflected ASE light to an optical switch which allows the detector to select between transmitted and reflected light. The signal transmitted through the switch is monitored by a scanning filter with the appropriate resolution to resolve the signal or noise peaks. A first scan of the transmitted peaks is carried out and the signal is digitized and stored. A second scan of the reflected noise is carried out and digitized. A microcomputer computes the peak values and wavelengths, calibrates the wavelength scale from the known grating wavelengths, recomputes the ASE shape and the SNR, and communicates the results to outside agents when queried.
摘要翻译：确定光信号的信噪比的一种方法是基于沿链路累积的放大的自发发射（ASE）模拟噪声本底。 ASE波长依赖性由具有有限数量参数的已知数学函数表示。该函数的参数是通过计算最佳拟合手段在有限数量的点测量噪声基底得出的。使用ITU分配波长之间波长的多个光纤光栅滤波器对光学噪声进行采样并反射光。光环行器用于将反射的ASE光引导到允许检测器在透射光和反射光之间进行选择的光开关。通过开关传输的信号由具有适当分辨率的扫描滤波器监测，以解决信号或噪声峰值。执行发送峰值的第一次扫描，并将信号数字化并存储。对反射噪声进行第二次扫描并进行数字化处理。微计算机计算峰值和波长，从已知光栅波长校准波长标度，重新计算ASE形状和SNR，并在查询时将结果传达给外部代理。

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