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    Iterative nonlinear compensation
    1.
    发明授权
    Iterative nonlinear compensation 有权

    公开(公告)号：US10148363B2

    公开(公告)日：2018-12-04

    申请号：US15372326

    申请日：2016-12-07

    申请人： ZTE Corporation

    发明人： Hung-Chang Chien ,  Zhensheng Jia ,  Jianjun Yu

    IPC分类号： H04B10/00 ,  H04B10/61

    摘要： A method of optical communication, implemented at a receiver in an optical communication network, includes receiving an optical signal carrying modulated information bits, processing the optical signal through a receiver subsystem to generate a stream of digitized modulation symbols from the optical signal, and producing, using the digitized modulation symbols as input symbols to an iterative process, estimates of information bits. Each iteration includes: generating estimated output symbols from input symbols by filtering by an estimate of inverse of the optical channel, updating, using the estimated output symbols, the estimate of the inverse of the optical channel to minimize a measure of error, and compensating the estimated output symbols by using pre-distortion values from a look-up table (LUT) to generate compensated output symbols that are used as input to a next iteration.

    Imaging cancellation in high-speed intensity modulation and direct detection system with dual single sideband modulation
    4.
    发明授权
    Imaging cancellation in high-speed intensity modulation and direct detection system with dual single sideband modulation 有权

    公开(公告)号：US10014954B2

    公开(公告)日：2018-07-03

    申请号：US15442523

    申请日：2017-02-24

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Yuanquan Wang

    IPC分类号： H04B10/61 ,  H04J14/02

    CPC分类号： H04B10/616 ,  H04B10/6163 ,  H04J14/0298 ,  H04L5/0007 ,  H04L27/2697 ,  H04L27/38

    摘要： Provided are methods and systems for receiving and processing optical signals. A dual single side band (SSB) modulation scheme is utilized to take advantage of a given wavelengths' bandwidth. Modulation schemes are employed that modulate each SSB with their In-phase (I) and Quadrature (Q) components. The methods and systems discussed utilize an adaptive equalizer and an LMS algorithm to remove imaging components of the left and right SSBs provided by the modulators. The adaptive equalizer and the LMS algorithm also compensate for linear and nonlinear distortions. Various algorithms can be employed, including but not limited to, algorithms for updating crosstalk coefficients in the equalizer, where the cross talk coefficients are induced from the imaging from the modulation of the dual SSB signal, and for updating coefficients relating to linear and nonlinear distortion.

    OPTICAL MM-WAVE SIGNAL GENERATION USING A SINGLE IQ MODULATOR
    6.
    发明申请
    OPTICAL MM-WAVE SIGNAL GENERATION USING A SINGLE IQ MODULATOR 审中-公开

    公开(公告)号：US20170317760A1

    公开(公告)日：2017-11-02

    申请号：US15499799

    申请日：2017-04-27

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Xinying Li ,  Hung-Chang Chien

    IPC分类号： H04B10/516 ,  H04L27/36

    CPC分类号： H04B10/5161 ,  H04B10/5165 ,  H04L27/206 ,  H04L27/2096 ,  H04L27/364

    摘要： A scheme for generating asymmetric single sideband photonic vector signal at millimeter wave spectral region is described. At a transmitter, information bits to be transmitted are modulated using a vector modulation technique to generate a baseband signal. The baseband signal is converted into its single sideband (SSB) version using a complex frequency source having a first frequency. The real part of the upconverted signal is added to the real part of a second frequency source and is input as I component to an I/Q modulator. The imaginary part of the upconverted signal is added to the imaginary part of the second frequency source and is used as the Q component. The I/Q modulator is driven by a laser source at frequency fc. The resulting signal is transmitter over an optical transmission medium and upconverted by a single-ended photodiode to a desired radio-frequency (RF) carrier frequency.

    IMAGING CANCELLATION IN HIGH-SPEED INTENSITY MODULATION AND DIRECT DETECTION SYSTEM WITH DUAL SINGLE SIDEBAND MODULATION
    7.
    发明申请
    IMAGING CANCELLATION IN HIGH-SPEED INTENSITY MODULATION AND DIRECT DETECTION SYSTEM WITH DUAL SINGLE SIDEBAND MODULATION 有权

    公开(公告)号：US20170250760A1

    公开(公告)日：2017-08-31

    申请号：US15442523

    申请日：2017-02-24

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Yuanquan Wang

    IPC分类号： H04B10/61 ,  H04L5/00 ,  H04J14/02

    CPC分类号： H04B10/616 ,  H04B10/6163 ,  H04J14/0298 ,  H04L5/0007 ,  H04L27/2697 ,  H04L27/38

    摘要： Provided are methods and systems for receiving and processing optical signals. A dual single side band (SSB) modulation scheme is utilized to take advantage of a given wavelengths' bandwidth. Modulation schemes are employed that modulate each SSB with their In-phase (I) and Quadrature (Q) components. The methods and systems discussed utilize an adaptive equalizer and an LMS algorithm to remove imaging components of the left and right SSBs provided by the modulators. The adaptive equalizer and the LMS algorithm also compensate for linear and nonlinear distortions. Various algorithms can be employed, including but not limited to, algorithms for updating crosstalk coefficients in the equalizer, where the cross talk coefficients are induced from the imaging from the modulation of the dual SSB signal, and for updating coefficients relating to linear and nonlinear distortion.

    PHOTONIC VECTOR SIGNAL GENERATION WITHOUT PRECODING
    9.
    发明申请
    PHOTONIC VECTOR SIGNAL GENERATION WITHOUT PRECODING 审中-公开
    光电子矢量信号发生，无需预编码

    公开(公告)号：US20170033872A1

    公开(公告)日：2017-02-02

    申请号：US15223342

    申请日：2016-07-29

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Yuanquan Wang ,  Xinying Li

    IPC分类号： H04B10/54 ,  H04B10/27 ,  G02F1/225 ,  H04B10/25

    CPC分类号： H04B10/541 ,  G02F1/2255 ,  G02F2001/212 ,  H04B10/2575 ,  H04B10/505

    摘要： A novel and simple photonic vector signal generation scheme at radio frequency (RF) bands enabled by a single-drive Mach-Zehnder modulator (MZM)-based optical carrier suppression (OCS) without precoding techniques and optical filter, which can reduce the complexity of transmitter digital signal processing (DSP), is described. The generation and reception of 16/20/22-Gbaud quadrature-phase-shift-keying (QPSK) vector signals at 16/20/22 GHz are experimentally demonstrated, respectively. The measured bit-error ratio for 16 G-baud QPSK vector signals after transmitting over 10-km standard single mode fiber (SSMF) can be under 7% hard-decision forward-error-correction (HD-FEC) threshold of 3.8×10−3. Moreover, compared to the conventional precoding scheme, the receiver sensitivity can be enhanced by 4 dB at both back-to-back (BTB) and after 10-km SSMF transmission cases, which demonstrates the feasibility of this technique, and show its potential promising application in radio over fiber (RoF) system.

    摘要翻译： 一种基于单驱动马​​赫 - 曾德调制器（MZM）的光载波抑制（OCS），无需预编码技术和滤波器的射频（RF）频带的新颖简单的光子矢量信号生成方案，可以降低复杂度 发射机数字信号处理（DSP）。 分别在16/20/22 GHz的16/20/22-G波特率正交相移键控（QPSK）矢量信号的生成和接收分别被实验证明。 在10km标准单模光纤（SSMF）发射之后，测量的16个G波特QPSK矢量信号的比特误差率可以低于7×10％的硬判决前向纠错（HD-FEC）阈值3.8×10 -3。 此外，与传统的预编码方案相比，接收机灵敏度可以在背对背（BTB）和10 km的SSMF传输情况下提高4 dB，这表明了该技术的可行性，并展示了其潜在的前景 在无线电中应用于光纤（RoF）系统。