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    • 81. 发明申请
    • DQPSK OPTICAL RECEIVER
    • DQPSK光接收机
    • US20120141145A1
    • 2012-06-07
    • US13372687
    • 2012-02-14
    • Yuichi AKIYAMAToshiki Tanaka
    • Yuichi AKIYAMAToshiki Tanaka
    • H04B10/06
    • H04B10/677
    • According to an aspect of an embodiment, a DQPSK optical receiver, comprising: a first LPF connected to a line branching off from between a first optical-electrical converter and a first data recovery circuit; a second LPF connected to a line branching off from between a second optical-electrical converter and a second data recovery circuit; a first LIA for amplifying a signal output from the first LPF and also limiting an amplitude of an output signal thereof; a second LIA for amplifying a signal output from the second LPF and also limiting an amplitude of an output signal thereof; a first mixer for multiplying the output signal from the first LIA by a signal output from the second LPF; and a second mixer for multiplying the output signal from the second LIA by a signal output from the first LPF.
    • 根据实施例的一个方面,一种DQPSK光接收机,包括:第一LPF,其连接到从第一光电转换器和第一数据恢复电路之间分支的线路; 连接到从第二光电转换器和第二数据恢复电路之间分支的线路的第二LPF; 第一LIA,用于放大从第一LPF输出的信号,并且还限制其输出信号的幅度; 第二LIA,用于放大从第二LPF输出的信号,并且还限制其输出信号的幅度; 第一混频器,用于将来自第一LIA的输出信号乘以从第二LPF输出的信号; 以及第二混频器,用于将来自第二LIA的输出信号乘以从第一LPF输出的信号。
    • 85. 发明申请
    • Electrical-dispersion compensating apparatus, optical receiving apparatus, and optical receiving method
    • 电色散补偿装置,光接收装置和光接收方法
    • US20090116844A1
    • 2009-05-07
    • US12230247
    • 2008-08-26
    • Toshiki TanakaYuichi AkiyamaTomoo Takahara
    • Toshiki TanakaYuichi AkiyamaTomoo Takahara
    • H04B10/00
    • H04B10/6971H04B10/677
    • An optical receiving apparatus branches an optical signal, photo-electric-converts the branched signals, and compensates dispersion in each of the converted electrical signals. Electrical-dispersion compensators respectively compensate the dispersion in the electrical signals using a transversal filter having plural taps. A dispersion control unit controls the dispersion compensation amount for each of the electrical signals by adjusting tap coefficients of the transversal filter. A delay control unit controls the difference in the delay time of the electrical signals by adjusting the tap coefficients adjusted by the dispersion control unit. An identifying circuit identifies data in the optical signal based on each of the electrical signals that have been subjected to dispersion compensation by each of the electrical-dispersion compensators.
    • 光接收装置分支光信号,对分支信号进行光电转换,并补偿每个转换的电信号中的色散。 电色散补偿器使用具有多个抽头的横向滤波器分别补偿电信号中的色散。 色散控制单元通过调整横向滤波器的抽头系数来控制每个电信号的色散补偿量。 延迟控制单元通过调整由色散控制单元调节的抽头系数来控制电信号的延迟时间的差异。 识别电路基于通过每个电色散补偿器进行色散补偿的每个电信号来识别光信号中的数据。