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47 条记录 (耗时 0.032 秒)

    Method and system for removing a pilot tone from an optical signal
    31.
    发明授权
    Method and system for removing a pilot tone from an optical signal 有权
    从光信号中去除导频音的方法和系统

    公开(公告)号：US09473263B2

    公开(公告)日：2016-10-18

    申请号：US14598581

    申请日：2015-01-16

    申请人： Zhiping Jiang ,  Zhuhong Zhang ,  Xuefeng Tang

    发明人： Zhiping Jiang ,  Zhuhong Zhang ,  Xuefeng Tang

    IPC分类号： H04B10/00 ,  H04J14/02 ,  H04B10/077

    CPC分类号： H04J14/0276 ,  H04B10/077 ,  H04B10/0775 ,  H04B10/2504 ,  H04B10/516 ,  H04B2210/075 ,  H04J14/06

    摘要： The present applies to digital wavelength converters that convert, independently of the format in which optical data may be encoded, an input waveform at a first wavelength to an output waveform at a second wavelength. When operating in an environment where an input waveform has a pilot tone associated thereto, the method and system of the present disclosure allows for the removal of the pilot tone from the input waveform, and also allows for the addition of another pilot to the output waveform.

    摘要翻译： 本发明适用于与光学数据可被编码的格式独立地将第一波长的输入波形转换为第二波长的输出波形的数字波长转换器。 当在输入波形具有与其相关联的导频音的环境中操作时，本公开的方法和系统允许从输入波形中去除导频音，并且还允许将另外的导频添加到输出波形 。

    Method with improved phase robustness in coherent detected optical system
    32.
    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
    35.
    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。

    Side Band Pilot Tone for Digital Signal Processing in Polarization Multiplexed Coherent Optical Communication System
    39.
    发明申请
    Side Band Pilot Tone for Digital Signal Processing in Polarization Multiplexed Coherent Optical Communication System 有权
    用于极化复用相干光通信系统中数字信号处理的边带导频

    公开(公告)号：US20110033184A1

    公开(公告)日：2011-02-10

    申请号：US12847749

    申请日：2010-07-30

    申请人： Zhuhong Zhang ,  Chuandong Li ,  Fei Zhu ,  Yusheng Bai

    发明人： Zhuhong Zhang ,  Chuandong Li ,  Fei Zhu ,  Yusheng Bai

    IPC分类号： H04J14/06

    CPC分类号： H04J14/06 ,  H04J14/002

    摘要： A method comprising generating a plurality of first symbols that correspond to a side band pilot tone (SBPT) signal for a plurality of data streams, mapping the first symbols into a plurality of second symbols that correspond to a plurality of signal components of the polarization multiplexed (PM) optical signal, and transmitting the second symbols in a plurality of data blocks of a PM optical signal. An apparatus comprising at least one processor coupled to a memory and configured to obtain a data block that comprises a plurality of SBPTs in a received PM optical signal, estimate a set of values for a carrier frequency and a polarization state, update a tap weight of a master equalizer based on the estimated set of values, and update a plurality of slave equalizers based on the updated tap weight of the master equalizer.

    摘要翻译： 一种方法，包括生成对应于多个数据流的边带导频（SBPT）信号的多个第一符号，将第一符号映射成与偏振复用的多个信号分量相对应的多个第二符号 （PM）光信号，并且在PM光信号的多个数据块中发送第二符号。 一种装置，包括耦合到存储器并被配置为获得包含接收的PM光信号中的多个SBPT的数据块的至少一个处理器，估计载波频率和极化状态的一组值，更新一个 基于估计的值集合的主均衡器，并且基于主均衡器的更新抽头权重来更新多个从均衡器。

    Apparatus and method for in-phase and quadrature skew calibration in a coherent transceiver
    40.
    发明授权
    Apparatus and method for in-phase and quadrature skew calibration in a coherent transceiver 有权

    公开(公告)号：US11088766B1

    公开(公告)日：2021-08-10

    申请号：US17008402

    申请日：2020-08-31

    申请人： Wing Chau Ng ,  Xuefeng Tang ,  Zhuhong Zhang

    发明人： Wing Chau Ng ,  Xuefeng Tang ,  Zhuhong Zhang

    IPC分类号： H04L25/03 ,  H04B10/61 ,  H04B7/0413

    摘要： Methods and apparatuses for IQ time skew calibration in a coherent transceiver are described. A four-channel signal is received. A set of inputs is constructed for a 4×8 MIMO equalizer by converting the four-channel signal into four complex inputs that each have a phase shift corresponding to an estimated carrier frequency offset. The set of inputs further includes conjugate replicas of the four complex inputs. Using output from the 4×8 MIMO equalizer, equalizer coefficients are calculated by minimizing error between the MIMO output and a reference signal. Receiver and transmitter IQ skew are estimated using the equalizer coefficients, by converting the equalizer coefficients form the time domain to the frequency domain to determine receiver and transmitter IQ differential phase responses, which are indicative of respective receiver and transmitter IQ skew in the time domain. Skew compensation is then performed.