SOFT-DECISION NON-BINARY LDPC CODING FOR ULTRA-LONG-HAUL OPTICAL TRANSOCEANIC TRANSMISSIONS
    1.
    发明申请
    SOFT-DECISION NON-BINARY LDPC CODING FOR ULTRA-LONG-HAUL OPTICAL TRANSOCEANIC TRANSMISSIONS 审中-公开
    用于超长距离光电传输的软决策非二进制LDPC编码

    公开(公告)号:US20120216093A1

    公开(公告)日:2012-08-23

    申请号:US13402462

    申请日:2012-02-22

    IPC分类号: H03M13/29 G06F11/10

    摘要: Methods and systems for soft-decision non-binary low-density parity-check (LDPC) coding for ultra-long-haul optical transoceanic transmissions are provided. A receiver includes one or more maximum a posteriori (MAP) equalizers configured to decode one or more symbols of an encoded input stream to provide one or more symbol log-likelihood ratios (LLRs). One or more LLR estimators are configured to estimate the log-likelihood ratios of the one or more symbol LLRs to provide one or more bit LLRs. One or more non-binary LDPC decoders are configured to decode the input stream using the one or more bit LLRs to recover an original input stream.

    摘要翻译: 提供了用于超长距离光学跨洋传输的软判决非二进制低密度奇偶校验(LDPC)编码的方法和系统。 接收机包括一个或多个最大后验(MAP)均衡器,其被配置为解码编码输入流的一个或多个符号以提供一个或多个符号对数似然比(LLR)。 一个或多个LLR估计器被配置为估计一个或多个符号LLR的对数似然比以提供一个或多个比特LLR。 一个或多个非二进制LDPC解码器被配置为使用一个或多个比特LLR解码输入流,以恢复原始输入流。

    Polarization-alternating optical signal generation using CSRZ modulation
    3.
    发明授权
    Polarization-alternating optical signal generation using CSRZ modulation 有权
    使用CSRZ调制的极化交替光信号生成

    公开(公告)号:US08787709B2

    公开(公告)日:2014-07-22

    申请号:US13435775

    申请日:2012-03-30

    IPC分类号: G02F1/035 G02F1/01

    摘要: A method for optical chirp-free optical polarization modulation includes dividing a data modulated optical signal into a first optical path and a second optical path, using a Mach-Zehnder intensity modulator in the first optical path for imparting a π phase difference between adjacent symbols of the data modulated optical signal in the first optical path, adjusting a delay and amplitude of symbols of the data modulated optical signal in the second path so that the symbols in the first path and the symbols in the second path are synchronized and have substantially equal power levels, and combining the first and second optical paths so that symbols from the first and second optical paths are in orthogonal polarizations.

    摘要翻译: 一种用于无啁啾光学偏振调制的方法包括:使用第一光路中的马赫 - 曾德尔强度调制器将数据调制光信号划分成第一光路和第二光路, 在第一光路中的数据调制光信号的相邻符号之间的相位差,调整第二路径中的数据调制光信号的符号的延迟和幅度,使得第一路径中的符号和第二路径中的符号为 同步并且具有基本上相等的功率电平,并且组合第一和第二光路,使得来自第一和第二光路的符号处于正交偏振。

    Coherent Interleaved Polarization-Multiplexing Optical Communications with Single IQ Modulator
    4.
    发明申请
    Coherent Interleaved Polarization-Multiplexing Optical Communications with Single IQ Modulator 审中-公开
    具有单IQ调制器的相干交错极化复用光通信

    公开(公告)号:US20120321311A1

    公开(公告)日:2012-12-20

    申请号:US13523045

    申请日:2012-06-14

    IPC分类号: H04J14/06

    摘要: An inventive method for coherent interleaved polarization-multiplexing PolMux optical communications with a single IQ modulator includes modulating a light source to generate a 50% return-to-zero RZ signal pulse at a frequency Rs, driving a single IQ modulator with inphase I and quadrature phase Q data at a bit rate of sais Rs to introduce phase modulation on said 50% RZ signal pulse to produce a QPSK pulse signal with all symbols being in a same polarization state without any time overlapping; and polarization modulating said QPSK signal to alternatively convert said QPSK signal into two orthogonal polarizations states enabling an interleaving PolMux signal with a symbol rate of Rs/2.

    摘要翻译: 用于具有单个IQ调制器的相干交错偏振复用PolMux光通信的创新方法包括调制光源以产生频率为Rs的50%归零RZ信号脉冲,以同相I和正交驱动单个IQ调制器 相位Q数据以sais的比特率在所述50%RZ信号脉冲上引入相位调制以产生QPSK脉冲信号,所有符号处于相同的极化状态,没有任何时间重叠; 以及对所述QPSK信号进行极化调制,以将所述QPSK信号交替地转换为使得能够以Rs / 2的符号率进行交织的PolMux信号的两个正交极化状态。

    Polarization-Alternating Optical Signal Generation using CSRZ Modulation
    7.
    发明申请
    Polarization-Alternating Optical Signal Generation using CSRZ Modulation 有权
    使用CSRZ调制的极化交替光信号生成

    公开(公告)号:US20120251028A1

    公开(公告)日:2012-10-04

    申请号:US13435775

    申请日:2012-03-30

    IPC分类号: G02F1/01

    摘要: A method for optical chirp-free optical polarization modulation includes dividing a data modulated optical signal into a first optical path and a second optical path, using a Mach-Zehnder intensity modulator in the first optical path for imparting a π phase difference between adjacent symbols of the data modulated optical signal in the first optical path, adjusting a delay and amplitude of symbols of the data modulated optical signal in the second path so that the symbols in the first path and the symbols in the second path are synchronized and have substantially equal power levels, and combining the first and second optical paths so that symbols from the first and second optical paths are in orthogonal polarizations.

    摘要翻译: 一种用于无啁啾光学偏振调制的方法包括:使用第一光路中的马赫 - 曾德尔强度调制器将数据调制光信号划分成第一光路和第二光路, 在第一光路中的数据调制光信号的相邻符号之间的相位差,调整第二路径中的数据调制光信号的符号的延迟和幅度,使得第一路径中的符号和第二路径中的符号为 同步并且具有基本上相等的功率电平,并且组合第一和第二光路,使得来自第一和第二光路的符号处于正交偏振。

    Compensation of optical transmission impairments using digital backward propagation
    10.
    发明授权
    Compensation of optical transmission impairments using digital backward propagation 有权
    使用数字反向传播补偿光传输损伤

    公开(公告)号:US08447191B2

    公开(公告)日:2013-05-21

    申请号:US12728854

    申请日:2010-03-22

    IPC分类号: H04B10/06

    CPC分类号: H04B10/2507 H04J14/002

    摘要: Systems and method of compensating for transmission impairment are disclosed. One such method comprises receiving a wavelength-division multiplexed optical signal. The received optical signal has been distorted in the physical domain by an optical transmission channel. The method further comprises propagating the distorted optical signal backward in the electronic domain in a corresponding virtual optical transmission channel. The backward propagation fully compensates for fiber dispersion, self-phase modulation, and cross-phase modulation (XPM) and partially compensates for four-wave mixing (FWM).

    摘要翻译: 公开了补偿传动损伤的系统和方法。 一种这样的方法包括接收波分复用光信号。 所接收的光信号在物理域中已被光传输通道失真。 该方法还包括在对应的虚拟光传输信道中的电子域中向后传播失真的光信号。 反向传播完全补偿光纤色散,自相位调制和交叉相位调制(XPM),并部分补偿四波混频(FWM)。