Polarization-Alternating Optical Signal Generation using CSRZ Modulation
    71.
    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。

    OPTIMIZED NORMALIZED LEAST MEAN SQUARE PHASE ESTIMATION
    73.
    发明申请
    OPTIMIZED NORMALIZED LEAST MEAN SQUARE PHASE ESTIMATION 有权
    优化正规化最小均方相位估计

    公开(公告)号:US20120106983A1

    公开(公告)日:2012-05-03

    申请号:US12938738

    申请日:2010-11-03

    IPC分类号: H04B10/06 H03D1/06

    摘要: Methods and systems for normalized least mean square phase estimation are shown that include receiving optical transmissions that include a modulated signal, determining a step size based on a signal-to-noise ratio (SNR) and a laser linewidth that provides a balance between convergence speed and precision, estimating phase error using the determined step size, derotating the modulated signal to remove the estimated phase error, and demodulating the derotated signal to produce a bitstream.

    摘要翻译: 示出了用于归一化的最小均方相位估计的方法和系统,其包括接收包括调制信号的光传输,基于信噪比(SNR)确定步长,以及提供收敛速度之间的平衡的激光线宽 和精确度,使用所确定的步长估计相位误差,解调调制信号以去除估计的相位误差,以及解调解旋信号以产生比特流。

    LDPC codes and stochastic decoding for optical transmission
    75.
    发明授权
    LDPC codes and stochastic decoding for optical transmission 有权
    用于光传输的LDPC码和随机解码

    公开(公告)号:US08099645B2

    公开(公告)日:2012-01-17

    申请号:US12195525

    申请日:2008-08-21

    IPC分类号: G06F11/00

    摘要: A method for error correction and a decoder using low density parity check (LDPC) codes includes initializing extrinsic probability information between variable nodes and check nodes in a bipartite graph including generating a Bernoulli sequence according to a probability of a bit having a value one. Parity checking is performed in accordance with a parity check equation. If the parity check equation is not satisfied, then extrinsic information is updated in check nodes from variable nodes using a parity node update logic circuit in a first half iteration, extrinsic information is updated in variable nodes from check nodes using a variable node update logic circuit in a second half iteration, and the variable nodes are updated with a probability based upon the extrinsic information passed between check nodes and variable nodes wherein the probability represents a likelihood that an ith bit is a one. Information bits are passed when the parity check equation is satisfied or a predetermined number of iterations has been reached.

    摘要翻译: 用于纠错的方法和使用低密度奇偶校验(LDPC)码的解码器包括在二分图中的可变节点和校验节点之间初始化外在概率信息,包括根据具有值1的比特的概率生成伯努利序列。 根据奇偶校验方程执行奇偶校验。 如果奇偶校验方程不满足,则在第一半迭代中使用奇偶校验节点更新逻辑电路,从可变节点的校验节点中更新外部信息,使用可变节点更新逻辑电路从校验节点在变量节点中更新外部信息 在第二半迭代中,并且基于在校验节点和可变节点之间传递的外部信息的概率来更新变量节点,其中概率表示第i位是一个的可能性。 当满足奇偶校验等式或达到预定数量的迭代时,信息比特被传递。

    Optical Frontend for Integration of Optical and Wireless Networks
    78.
    发明申请
    Optical Frontend for Integration of Optical and Wireless Networks 审中-公开
    用于光和无线网络集成的光学前端

    公开(公告)号:US20090285577A1

    公开(公告)日:2009-11-19

    申请号:US12119884

    申请日:2008-05-13

    IPC分类号: H04J14/02

    摘要: Data is transmitted by radio over fiber in a wavelength division multiplex optical transmission system. Data is transmitted over a single optical channel by directly modulating a single wavelength laser with a baseband data signal. Multiple single wavelength laser beams are multiplexed into a single multi-wavelength laser beam. All of the single optical channels are up-converted to RF frequencies by modulating the intensity of the multi-wavelength laser beam with an RF carrier.

    摘要翻译: 数据通过光纤通过波分复用光传输系统传输。 通过用基带数据信号直接调制单个波长激光器,通过单个光通道传输数据。 多个单波长激光束被复用成单个多波长激光束。 通过用RF载体调制多波长激光束的强度,所有单个光通道被上变频到RF频率。

    MULTIDIMENSIONAL TURBO PRODUCT CODES AND GENERALIZED LOW-DENSITY PARITY-CHECK CODES WITH COMPONENT REED-SOLOMON CODES FOR OPTICAL TRANSMISSION
    79.
    发明申请
    MULTIDIMENSIONAL TURBO PRODUCT CODES AND GENERALIZED LOW-DENSITY PARITY-CHECK CODES WITH COMPONENT REED-SOLOMON CODES FOR OPTICAL TRANSMISSION 有权
    多组份涡轮产品代码和通用低密度奇偶校验码与组件光电代码进行光传输

    公开(公告)号:US20090282314A1

    公开(公告)日:2009-11-12

    申请号:US12392374

    申请日:2009-02-25

    IPC分类号: H03M13/29 G06F11/10

    摘要: A transmitter, a receiver, and corresponding methods are provided. The transmitter includes encoders configured to encode source bit streams from L information sources into bytes of codewords. Each encoder includes different (n, k) multidimensional turbo-product codes of code rate R=k/n, where k is a number of information bytes, and n is code word length. The encoders operate in at least two phases. A first phase involves operating ky column-encoders in parallel on kx bytes per column to generate the code words for a current dimension. A second phase involves operating nx row-encoders in parallel on ky memory locations per rows to generate the code words for the current dimension. The first and second phases are repeated for remaining layers of the current dimension and layers of other dimensions.

    摘要翻译: 提供发射机,接收机和相应的方法。 发射机包括被配置为将来自L个信息源的源比特流编码成码字的字节的编码器。 每个编码器包括码率R = k / n的不同(n,k)多维turbo乘积码,其中k是信息字节数,n是码字长度。 编码器至少运行两个阶段。 第一阶段涉及每列以kx字节并行运行ky列编码器,以生成当前维度的代码字。 第二阶段涉及在每行每个ky个存储单元上并行运行nx行编码器,以生成当前维度的代码字。 对于当前尺寸和其他尺寸的层的剩余层重复第一和第二阶段。

    GLDPC ENCODING WITH REED-MULLER COMPONENT CODES FOR OPTICAL COMMUNICATIONS
    80.
    发明申请
    GLDPC ENCODING WITH REED-MULLER COMPONENT CODES FOR OPTICAL COMMUNICATIONS 有权
    GLDPC编码用于光通信的冗余组件代码

    公开(公告)号:US20090199065A1

    公开(公告)日:2009-08-06

    申请号:US12189759

    申请日:2008-08-11

    IPC分类号: H03M13/05 G06F11/10

    CPC分类号: H03M13/1174 H03M13/136

    摘要: A method of encoding for optical transmission of information includes encoding information with a generalized low-density parity-check (GLDPC) code for providing coding gains, and constructing the GLDPC code with a Reed-Muller RM code as a component code, the component code being decodable using a maximum posterior probability (MAP) decoding. In a preferred embodiment, the GLDPC code includes a codeword length of substantially 4096, an information word length of substantially 3201, a lower-bound on minimum distance of substantially greater than or equal to 16, a code rate of substantially 0.78 and the RM component code includes an order of substantially 4 and an r parameter of substantially 6.

    摘要翻译: 用于信息的光传输的编码方法包括使用用于提供编码增益的广义低密度奇偶校验(GLDPC)码的编码信息,以及用作为分量代码的里德 - 穆勒RM码构建GLDPC码, 使用最大后验概率(MAP)解码来解码。 在优选实施例中,GLDPC代码包括基本上为4096的码字长度,基本为3201的信息字长度,基本上大于或等于16的最小距离的下限,码率基本上为0.78,并且RM分量 代码包括基本为4的顺序和基本为6的r参数。