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    Method and system for discrete multi-tone transmission with multiple modulations
    22.
    发明授权
    Method and system for discrete multi-tone transmission with multiple modulations 有权

    公开(公告)号：US09749056B2

    公开(公告)日：2017-08-29

    申请号：US14596875

    申请日：2015-01-14

    申请人： Chuandong Li ,  Zhuhong Zhang ,  Mahdi Zamani

    发明人： Chuandong Li ,  Zhuhong Zhang ,  Mahdi Zamani

    IPC分类号： H04B10/11 ,  H04B10/516 ,  H04L27/26

    CPC分类号： H04B10/5161 ,  H04L27/2601

    摘要： Optical network devices and method for optical network communications in discrete multi-tone (DMT) are provided. A serial information signal is converted to groups of bits and loaded to parallel processing branches based on bit rates of the parallel processing branches. Each branch is configured to encode the associated group of data bits on the associated tone. A first bit rate and modulation and power allocation to a first branch of the branches may be different from a second bit rate and modulation and power allocation to a second branch of the branches. To recover the incoming data, the encoded signal may be parallel-processed using branches with different demodulation formats and provide the serial data stream.

    Method with improved phase robustness in coherent detected optical system
    25.
    发明授权
    Method with improved phase robustness in coherent detected optical system 有权
    相干检测光学系统相位鲁棒性提高的方法

    公开(公告)号：US09025969B2

    公开(公告)日：2015-05-05

    申请号：US13480230

    申请日：2012-05-24

    申请人： Chuandong Li ,  Yuanjie Chen ,  Zhuhong Zhang ,  Yi Cai ,  Fei Zhu

    发明人： Chuandong Li ,  Yuanjie Chen ,  Zhuhong Zhang ,  Yi Cai ,  Fei Zhu

    IPC分类号： H04B10/06 ,  H04B10/61

    CPC分类号： H04B10/613 ,  H04B10/6164

    摘要： An optical signal receiver tracks local oscillator frequency offset (LOFO) and compensates for the phase distortion introduced in the received signals as a result of utilizing the local oscillator within a coherent detection scheme. This phase distortion is basically a constant phase rotation caused by the LOFO and implementation of the receiver using coherent detection and a digital interferometer instead of a conventional (yet complex) carrier phase estimation or recovery scheme. With an optical receiver implemented in this manner, the requirement of using a precise local oscillator laser with low frequency offset is less important.

    摘要翻译： 光信号接收器跟踪本地振荡器频率偏移（LOFO），并且通过在相干检测方案中利用本地振荡器来补偿在接收信号中引入的相位失真。 该相位失真基本上是由LOFO引起的恒定相位旋转和使用相干检测的接收机的实现以及数字干涉仪而不是常规（但复杂的）载波相位估计或恢复方案。 通过以这种方式实现的光接收机，使用具有低频偏移的精确本地振荡器激光器的要求不那么重要。

    Linear Dispersion Polarization-Time Codes and Equalization in Polarization Multiplexed Coherent Optical System
    28.
    发明申请
    Linear Dispersion Polarization-Time Codes and Equalization in Polarization Multiplexed Coherent Optical System 有权
    线性色散偏振时间码和极化复用相干光学系统中的均衡

    公开(公告)号：US20130272704A1

    公开(公告)日：2013-10-17

    申请号：US13601360

    申请日：2012-08-31

    申请人： Mahdi Zamani ,  Chuandong Li ,  Zhuhong Zhang

    发明人： Mahdi Zamani ,  Chuandong Li ,  Zhuhong Zhang

    IPC分类号： H04J14/06

    CPC分类号： H04J14/06 ,  H04B10/5055 ,  H04B10/532 ,  H04J14/02 ,  H04L27/2697

    摘要： A method of optical communication comprising encoding four modulated symbols to generate four encoded symbols in two orthogonal polarizations and transmitting the four encoded symbols in two successive time slots. An optical communication apparatus comprising a processor configured to receive two sequences of digital symbols in a plurality of time slots, wherein the two sequences correspond to two components of two orthogonal polarizations, wherein one digital symbol per polarization is received in each of the plurality of time slots, divide each of the two sequences into a plurality of groups using a modulo operation of time, wherein each group comprises two digital symbols received in two consecutive time slots, and adaptively equalize the four digital symbols of the two consecutive time slots using a 4×4 matrix to generate four modulated symbols, wherein the 4×4 matrix comprises 16 tap-vectors.

    摘要翻译： 一种光通信方法，包括编码四个调制符号以在两个正交偏振中产生四个编码符号，并在两个连续的时隙中发送四个编码符号。 一种光通信设备，包括被配置为在多个时隙中接收两个数字符号序列的处理器，其中两个序列对应于两个正交偏振的两个分量，其中在多个时间的每一个中接收每个极化的一个数字符号 时隙，使用时间的模运算将两个序列中的每一个划分为多个组，其中每个组包括在两个连续时隙中接收的两个数字符号，并且使用4个时隙自适应地均衡两个连续时隙的四个数字符号 ×4矩阵以生成四个调制符号，其中4×4矩阵包括16个抽头矢量。