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85 条记录 (耗时 0.02 秒)

    Photonic vector signal generation without precoding
    21.
    发明授权
    Photonic vector signal generation without precoding 有权

    公开(公告)号：US10044444B2

    公开(公告)日：2018-08-07

    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 ,  H04B10/25 ,  H04B10/27 ,  G02F1/225 ,  G02F1/21

    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 16G-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.

    Signal to noise ratio estimation in optical communication networks
    24.
    发明授权
    Signal to noise ratio estimation in optical communication networks 有权

    公开(公告)号：US09819411B2

    公开(公告)日：2017-11-14

    申请号：US14883563

    申请日：2015-10-14

    申请人： ZTE Corporation

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

    IPC分类号： H04B10/08 ,  H04B10/073

    CPC分类号： H04B10/073

    摘要： Optical signal to noise ratio within a band of interest (in-band OSNR) is calculated by using a reference signal for noise estimation. In-band noise at a node along the optical communication path is estimated by subtracting the reference signal contribution from the received in-band signal energy. Contribution from the reference signal is calculated using an effective transfer function of the optical communication path using either a direct method in which measurements are made a priori on an equivalent optical system or an indirect method in which the effective transfer function is calculated using computerized simulations. The selection of which method to use may be based on the desired resolution bandwidth for the estimation of transfer function.

    TRANSMISSION AND RECEPTION OF QUAD-SUBCARRIER ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED SIGNALS
    28.
    发明申请
    TRANSMISSION AND RECEPTION OF QUAD-SUBCARRIER ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED SIGNALS 有权
    四通道正交分频多路复用信号的传输和接收

    公开(公告)号：US20150110492A1

    公开(公告)日：2015-04-23

    申请号：US14521364

    申请日：2014-10-22

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Fan Li

    IPC分类号： H04L1/00 ,  H04B10/60 ,  H04L27/18

    CPC分类号： H04B10/60 ,  H04B10/612 ,  H04J14/00 ,  H04L27/18 ,  H04L27/206 ,  H04L27/2601 ,  H04L27/2614 ,  H04L27/2647 ,  H04L27/362

    摘要： A dual-polarization, 4-subcarriers orthogonal frequency division multiplexed signal carrying information bits is transmitted in an optical communication network without transmitting a corresponding pilot tone or training sequence. A receiver receives the transmitted signal and recovers information bits using a blind equalization technique and by equalizing the 4-subcarriers OFDM signal as a 25-QAM signal in time domain with a CMMA (constant multi modulus algorithm) equalization method.

    摘要翻译： 在光通信网络中发送携带双重极化的4子载波正交频分复用信号位信息，而不发送对应的导频音或训练序列。 接收机接收所发送的信号，并使用盲均衡技术恢复信息比特，并且通过使用CMMA（恒定多模算法）均衡方法在时域中均衡4子载波OFDM信号作为25-QAM信号。

    PRE-EQUALIZATION USING PHASE CORRECTION
    29.
    发明申请
    PRE-EQUALIZATION USING PHASE CORRECTION 有权
    使用相位校正的均衡化

    公开(公告)号：US20140334828A1

    公开(公告)日：2014-11-13

    申请号：US14274669

    申请日：2014-05-09

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Ze Dong

    IPC分类号： H04B10/556

    CPC分类号： H04B10/2507 ,  H04B10/073 ,  H04B10/516 ,  H04B10/63

    摘要： An optical transmitter determines the transfer function in the reference-based pre-equalization for applying to an optically modulated signal at the transmitter. The determined pre-equalization transfer function is made robust to linewidth inaccuracy of the optical source by performing phase correction during the calculation of the pre-equalization transfer function. The phase correction includes averaging a number of consecutive received phase samples. The determined pre-equalization transfer function is applied to modulated signals prior to the transmission over an optical medium.

    摘要翻译： 光发射机确定基于参考的预均衡中的传递函数，以应用于发射机处的光调制信号。 通过在预均衡传递函数的计算期间执行相位校正，确定的预均衡传递函数对于光源的线宽不准确性是鲁棒的。 相位校正包括对多个连续的接收相位采样进行平均。 所确定的预均衡传递函数在通过光学介质传输之前被应用于调制信号。

    Nonlinearity pre-compensation of high order modulation transmissions
    30.
    发明授权
    Nonlinearity pre-compensation of high order modulation transmissions 有权

    公开(公告)号：US10567211B2

    公开(公告)日：2020-02-18

    申请号：US15814347

    申请日：2017-11-15

    申请人： ZTE Corporation

    发明人： Jianjun Yu ,  Hung-Chang Chien

    IPC分类号： H04L27/36 ,  H04B10/61 ,  H04B10/079 ,  H04B10/524 ,  H04L5/00

    摘要： An optical transmitter apparatus is disclosed. The apparatus includes a processor, a memory coupled to the processor, and one or more programs configured to be executed by the processor. The programs include instructions for nonlinearity estimation that characterizes nonlinearity in an optical communication and estimates an amount of symbol distortion caused by the nonlinearity, instructions for selecting and mapping symbols to provide, for the nonlinearity estimation, only symbols that meet predetermined nonlinearity criteria, and instructions for storing, in the memory, the amount of symbol distortion to be used for a nonlinearity pre-compensation.