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    • 5. 发明授权
    • Systems and methods for determining the spectral content of an optical signal
    • 用于确定光信号的光谱含量的系统和方法
    • US07265849B2
    • 2007-09-04
    • US10670538
    • 2003-09-25
    • Mohan GurunathanWilliam Ian McAlexanderTun S. Tan
    • Mohan GurunathanWilliam Ian McAlexanderTun S. Tan
    • G01B9/02
    • G01J9/04
    • In one embodiment, a method determines the spectral content of an optical signal. Specifically, the optical signal and an optical local oscillator (LO) signal are provided to inputs of an optical hybrid (e.g., an N×N optical coupler where N is greater than two). The phase-diverse components from the optical hybrid are photodetected allowing for mixing of the optical signal and the optical local oscillator. Bandpass filtering is performed to eliminate or reduce relative intensity noise (RIN). The filtered signals are mixed with an electrical LO signal. A quadrature representation of a phase-diverse heterodyne signal is generated from signals from the mixing. The negative image and the positive image from the quadrature representation are separated. The spectral content of the optical signal is determined from the images.
    • 在一个实施例中,一种方法确定光信号的频谱内容。 具体地,将光信号和光本地振荡器(LO)信号提供给光混合(例如,N大于2的NxN光耦合器)的输入。 来自光学混合物的相位不同的分量被光电检测,允许光学信号和光学本地振荡器的混合。 执行带通滤波以消除或减少相对强度噪声(RIN)。 经滤波的信号与电LO信号混合。 相位分集外差信号的正交表示由混合信号产生。 来自正交表示的负像和正像被分离。 根据图像确定光信号的光谱内容。
    • 6. 发明授权
    • Heterodyne based optical spectrum analysis with controlled optical attenuation
    • 基于Heterodyne的光谱分析,具有受控的光衰减
    • US07012697B2
    • 2006-03-14
    • US10279436
    • 2002-10-24
    • William Ian McAlexanderDouglas M. Baney
    • William Ian McAlexanderDouglas M. Baney
    • G01B9/02
    • G01J9/04G01J2001/0276
    • An optical heterodyne detection system includes an attenuator for attenuating an input signal before the input signal is combined with a local oscillator signal. An optimal attenuation level for the input signal, which improves the signal to noise ratio of the heterodyne beat signal, is determined by obtaining a base measurement of an output signal in response to the local oscillator signal and in the absence of the input signal, obtaining sample measurements of the output signal in response to the input signal as a function of different attenuation levels, and determining the optimal attenuation level as a function of the base measurement and the sample measurements. A minimum attenuation level for the input signal, which protects receiver photodetectors from being saturated or damaged, is determined by setting an initial attenuation level and gradually reducing the attenuation level until the voltage limit of the photodetectors is reached.
    • 光外差检测系统包括用于在输入信号与本地振荡器信号组合之前衰减输入信号的衰减器。 通过获得响应于本地振荡器信号的输出信号的基本测量并且在不存在输入信号的情况下获得用于提高外差拍信号的信噪比的输入信号的最佳衰减电平,获得 作为响应于作为不同衰减水平的函数的输入信号的输出信号的采样测量,以及确定作为基本测量和样本测量的函数的最佳衰减水平。 通过设置初始衰减电平并逐渐减小衰减电平来确定保护接收机光电探测器不被饱和或损坏的输入信号的最小衰减电平直到达到光电检测器的电压极限。