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    Adaptive equalization device, adaptive equalization method, and communication device
    1.
    发明授权
    Adaptive equalization device, adaptive equalization method, and communication device 有权

    公开(公告)号：US11611395B2

    公开(公告)日：2023-03-21

    申请号：US17273544

    申请日：2019-10-07

    申请人： NTT Electronics Corporation

    发明人： Tomohiro Takamuku ,  Mitsuteru Yoshida ,  Tsutomu Takeya ,  Kazuhito Takei ,  Katsuichi Oyama ,  Tomoharu Semboku

    IPC分类号： H04B10/2507 ,  H04B10/2569 ,  H04B10/61

    摘要： First compensation circuitry includes a first digital filter compensating a phase difference between a phase of a symbol of a received signal and a sampling timing, and first filter coefficient calculation circuitry calculating a filter coefficient of the first digital filter as a first filter coefficient. Second filter coefficient calculation circuitry calculates, as a second filter coefficient, a filter coefficient for adaptive equalization that compensates distortion due to temporally changing polarization dispersion, based on an output of the first digital filter. Coefficient combination circuitry combines the first filter coefficient and the second filter coefficient. Second compensation circuitry includes a second digital filter which uses a filter coefficient combined by the coefficient combination circuitry and performs a compensation of the phase difference between the phase of the symbol of the received signal and the sampling timing, and a process of the adaptive equalization at the same time.

    Adaptive equalizer, adaptive equalization method, and optical communication system
    4.
    发明授权
    Adaptive equalizer, adaptive equalization method, and optical communication system 有权

    公开(公告)号：US12040834B2

    公开(公告)日：2024-07-16

    申请号：US17596617

    申请日：2020-06-10

    申请人： NTT ELECTRONICS CORPORATION

    发明人： Tomohiro Takamuku ,  Mitsuteru Yoshida ,  Tsutomu Takeya ,  Tomoharu Senboku

    IPC分类号： H04B10/2569 ,  H04B3/06 ,  H04B10/61

    CPC分类号： H04B10/2569 ,  H04B3/06 ,  H04B10/61

    摘要： An adaptive equalizer (70) according to this invention includes an adaptive equalization filter (71) configured to adaptively compensate for a waveform distortion caused by a polarization fluctuation of a received signal (61) by updating a tap coefficient, a first tap coefficient updater (72) configured to calculate the tap coefficient according to the polarization fluctuation of the received signal (61) using a variable step size and update the tap coefficient of the adaptive equalization filter (71), a second tap coefficient updater (73) configured to calculate the tap coefficient according to the polarization fluctuation of the received signal (61) using a fixed step size μ0, a polarization state estimator (74) configured to estimate a polarization state of the received signal (61) using the tap coefficient calculated by the second tap coefficient updater (73), and a step size updater (75) configured to obtain the step size corresponding to the polarization state estimated by the polarization state estimator (74) and update the variable step size. According to this invention, it is possible to provide an adaptive equalizer that always implements stable followability to various SOP fluctuations.