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    • 99. 发明授权
    • Optical offset signal cancellation for optical receiver
    • 光接收机的光偏移信号消除
    • US07536107B2
    • 2009-05-19
    • US11026632
    • 2004-12-30
    • Fabrice PailletTanay KarnikJianping XuDonald S. Gardner
    • Fabrice PailletTanay KarnikJianping XuDonald S. Gardner
    • H04B10/00
    • H04B10/66
    • A laser driver for high speed interconnections may convert a digital signal to a current train of a bias mode to represent logical zero and of a modulation mode to represent logical one. An optical signal thus produced may include an optical offset. An optical receiver may include a photo-detector to receive the optical signal and generate a current signal, which includes a corresponding current offset. A first amplifier stage converts the current signal to a voltage signal and a second amplifier stage generates a digital output from the voltage signal. One or more low-pass filters may be used to filter the digital output and generate a filtered offset signal for a differential amplifier to generate an offset cancellation signal. The offset cancellation signal may be provided to offset cancellation circuitry to remove the current offset from the current signal generated by the photo-detector.
    • 用于高速互连的激光驱动器可以将数字信号转换为偏置模式的当前列,以表示逻辑零和调制模式以表示逻辑1。 如此产生的光信号可以包括光偏移。 光接收器可以包括光检测器,用于接收光信号并产生电流信号,其包括对应的电流偏移。 第一放大器级将电流信号转换为电压信号,第二放大器级从电压信号产生数字输出。 可以使用一个或多个低通滤波器来对数字输出进行滤波,并产生用于差分放大器的滤波偏移信号以产生偏移消除信号。 可以将偏移消除信号提供给偏移消除电路,以从光电检测器产生的电流信号中去除电流偏移。