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47 条记录 (耗时 0.067 秒)

    Optical transceiver, communication system, and adaptive frequency control method
    3.
    发明授权
    Optical transceiver, communication system, and adaptive frequency control method 有权

    公开(公告)号：US10187155B2

    公开(公告)日：2019-01-22

    申请号：US15352040

    申请日：2016-11-15

    申请人： Zhiping Jiang ,  Chuandong Li ,  Zhuhong Zhang ,  Xuefeng Tang

    发明人： Zhiping Jiang ,  Chuandong Li ,  Zhuhong Zhang ,  Xuefeng Tang

    IPC分类号： H04B10/00 ,  H04B10/40 ,  H04B3/32 ,  H04B10/556 ,  H04Q11/00 ,  H04B10/572 ,  H04B10/61 ,  H04J14/02

    摘要： An optical transceiver is provided with an optical front end for receiving signal light comprising an optical sub-channel, and for providing an electrical signal based on the signal light; a light source optically coupled to the optical front end for providing local oscillator light thereto for mixing with the signal light; an electro-optical modulator coupled to the light source for receiving output light therefrom and for modulating the output light with digital information to obtain modulated light; and a signal processor operably coupled to the optical front end. The signal processor is configured for processing the electrical signal to obtain a frequency offset of the sub-channel; and adjusting an optical frequency of the modulated light based on the frequency offset. When applied to a multiple-access environment, this may allow access nodes to generate optical sub-channels in the uplink direction using the downlink optical signal as an optical frequency reference.

    Fractionally Spaced Adaptive Equalizer With Non-Integer Sampling
    4.
    发明申请
    Fractionally Spaced Adaptive Equalizer With Non-Integer Sampling 有权

    公开(公告)号：US20170257234A1

    公开(公告)日：2017-09-07

    申请号：US15228592

    申请日：2016-08-04

    申请人： Syed Faisal Ali Shah ,  Chuandong Li ,  Zhuhong Zhang

    发明人： Syed Faisal Ali Shah ,  Chuandong Li ,  Zhuhong Zhang

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03949 ,  H04L25/03063 ,  H04L25/03885

    摘要： An apparatus for performing fractionally spaced adaptive equalization with non-integer sub-symbol sampling has an adaptive equalizer that receives a continuous stream of input data having a non-integer, fractional delay between consecutive samples at a non-integer, sub-symbol rate and outputs a stream of equalized data based on tap weights of taps of the adaptive equalizer that are spaced at an interval corresponding to the non-integer, sub-symbol rate. The tap weights are updated independently of the fractional delay between consecutive samples of the input data using an error signal. An equalizer output alignment component downstream of the adaptive equalizer aligns the stream of equalized data with a corresponding transmitted symbol.

    Method and apparatus of using joint timing recovery for a coherent optical system
    6.
    发明授权
    Method and apparatus of using joint timing recovery for a coherent optical system 有权
    用于相干光学系统的联合定时恢复的方法和装置

    公开(公告)号：US08737847B2

    公开(公告)日：2014-05-27

    申请号：US13423959

    申请日：2012-03-19

    申请人： Chuandong Li ,  Zhuhong Zhang ,  Fei Zhu ,  Yu Sheng Bai

    发明人： Chuandong Li ,  Zhuhong Zhang ,  Fei Zhu ,  Yu Sheng Bai

    IPC分类号： H04B10/06

    CPC分类号： H04B10/6162

    摘要： An apparatus and method for performing joint equalization and timing recovery in coherent optical systems. The method includes equalizing signals to generate compensated polarization signals, wherein timing error in a distorted optical signal is calculated based on one of the compensated polarization signals. The method further includes performing resampling polarization signals to correct timing offset in an optical signal based on the calculated timing error. The calculated timing error may also be used to adaptively control one or more operating parameters of an external device.

    摘要翻译： 用于在相干光学系统中执行联合均衡和定时恢复的装置和方法。 该方法包括均衡信号以产生补偿的偏振信号，其中基于补偿的偏振信号中的一个来计算失真的光信号中的定时误差。 该方法还包括基于所计算的定时误差来执行重采样偏振信号以校正光信号中的定时偏移。 所计算的定时误差也可用于自适应地控制外部设备的一个或多个操作参数。

    Fractionally spaced adaptive equalizer with non-integer sampling
    10.
    发明授权
    Fractionally spaced adaptive equalizer with non-integer sampling 有权

    公开(公告)号：US09755864B1

    公开(公告)日：2017-09-05

    申请号：US15228592

    申请日：2016-08-04

    申请人： Syed Faisal Ali Shah ,  Chuandong Li ,  Zhuhong Zhang

    发明人： Syed Faisal Ali Shah ,  Chuandong Li ,  Zhuhong Zhang

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03949 ,  H04L25/03063 ,  H04L25/03885

    摘要： An apparatus for performing fractionally spaced adaptive equalization with non-integer sub-symbol sampling has an adaptive equalizer that receives a continuous stream of input data having a non-integer, fractional delay between consecutive samples at a non-integer, sub-symbol rate and outputs a stream of equalized data based on tap weights of taps of the adaptive equalizer that are spaced at an interval corresponding to the non-integer, sub-symbol rate. The tap weights are updated independently of the fractional delay between consecutive samples of the input data using an error signal. An equalizer output alignment component downstream of the adaptive equalizer aligns the stream of equalized data with a corresponding transmitted symbol.