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    • 34. 发明公开
    • OPTICAL RECEIVER AND OPTICAL TRANSMISSION SYSTEM
    • OPTISCHEREMPFÄNGERUND OPTISCHESÜBERTRAGUNGSSYSTEM
    • EP2592767A1
    • 2013-05-15
    • EP10854444.6
    • 2010-07-09
    • Hitachi, Ltd.
    • KIKUCHI, Nobuhiko
    • H04B10/04H04B10/06H04B10/14H04B10/142H04B10/152H04B10/26H04B10/28H04L27/01
    • H04B10/00H04B10/60H04B10/612H04B10/677H04B10/697
    • An optical receiver 300 uses two optical delay detectors 223 (which have been set such that the delay times T are equal to symbol time and the phase differences are zero and 90 degrees) to receive an optical multilevel signal 215 and the output signals are A/D converted, thereafter subjected to retiming processes, and then subjected to a differential phase detection, thereby detecting a differential phase at a symbol center time point. In the receiver, the detected differential phase is integrated for each symbol and thereafter combined with an amplitude component obtained from a separately disposed optical intensity receiver, thereby reproducing an optical electric field. Thereafter, a wavelength dispersion compensation circuit (231) of a time period T is used to compensate for the wavelength dispersion of the transmission path. Moreover, an electric or optical Nyquist filter may be inserted to perform a band limitation, thereby enhancing the wavelength dispersion compensation effect.
    • 光接收器300使用两个光延迟检测器223(其被设置为使得延迟时间T等于符号时间并且相位差为零和90度)以接收光学多电平信号215,并且输出信号为A / D转换,然后进行重新定时处理,然后进行差分相位检测,从而在符号中心时间点检测差分相位。 在接收机中,检测到的差分相位针对每个符号进行积分,然后与从单独配置的光强度接收器获得的振幅分量相结合,从而再现光电场。 此后,使用时间段T的波长色散补偿电路(231)来补偿传输路径的波长色散。 此外,可以插入电或光奈奎斯特滤波器以执行频带限制,从而增强波长色散补偿效果。