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    Efficient data transmission and training of data processing functions
    1.
    发明授权
    Efficient data transmission and training of data processing functions 失效
    高效的数据传输和数据处理功能的培训

    公开(公告)号：US07522841B2

    公开(公告)日：2009-04-21

    申请号：US11328199

    申请日：2006-01-10

    申请人： Chandra Bontu ,  Kuang Tsan Wu ,  John McNicol ,  Kim B. Roberts ,  Han Sun

    发明人： Chandra Bontu ,  Kuang Tsan Wu ,  John McNicol ,  Kim B. Roberts ,  Han Sun

    IPC分类号： H04B10/00

    CPC分类号： H04J3/0608 ,  H04J14/06 ,  H04L7/027 ,  H04L7/0278 ,  H04L7/048

    摘要： A method of a conveying data through an optical communications system. An optical signal is received through the optical communication system, the optical signal comprising data symbols and SYNC bursts, each SYNC burst having a predetermined symbol sequence. The received optical signal is oversampled to generate a multi-bit sample stream. The sample stream is partitioned into blocks of contiguous samples, wherein each block of samples partially overlaps at least one other block of samples and encompasses at least one SYNC burst and a plurality of data symbols. Each block of samples is independently processed to detect a value of each data symbol.

    摘要翻译： 一种通过光通信系统传送数据的方法。 通过光通信系统接收光信号，光信号包括数据符号和SYNC脉冲串，每个SYNC脉冲串具有预定的符号序列。 所接收的光信号被过采样以产生多比特采样流。 样本流被划分为连续样本块，其中每个样本块与至少一个其他样本块部分重叠，并且包含至少一个SYNC突发和多个数据符号。 每个样本块被独立地处理以检测每个数据符号的值。

    Carrier lock detector
    2.
    发明授权
    Carrier lock detector 有权
    载体锁定检测器

    公开(公告)号：US07292653B2

    公开(公告)日：2007-11-06

    申请号：US10796152

    申请日：2004-03-10

    申请人： Kuang Tsan Wu ,  Han Sun ,  John McNicol

    发明人： Kuang Tsan Wu ,  Han Sun ,  John McNicol

    IPC分类号： H04L27/00 ,  H04L27/22 ,  H04L27/06

    CPC分类号： H04L27/3827 ,  H04L27/0014

    摘要： A carrier lock detector for a QPSK or 4-QAM system implements a lock detection algorithm that maps detected signals onto one of first and second areas associated with nominal states defined by (I2⊕I3)·(Q2⊕Q3) and Q1⊕Q2·(I1 I2I3+ I1I2I3)+( I1⊕I2)·(Q1 Q2Q3+ Q1Q2Q3), or alternatively, by ( I1⊕I2· Q2⊕Q3)+( Q1⊕Q2· I2⊕I3), respectively. When detected signals map onto one of the first areas, a first signal is generated. When detected signals map onto one of the second areas, a second signal is generated. When a difference between the first and second signals exceeds a threshold, a carrier lock detection signal is generated to enable a decoder. The carrier lock detector is able to detect carrier lock at a raw BER of 1e-2 or greater at a very low signal-to-noise ratio.

    摘要翻译： 用于QPSK或4-QAM系统的载波锁定检测器实现锁定检测算法，该检测算法将检测到的信号映射到与由（I 2>⊕I3）定义的标称状态相关联的第一和第二区域之一 （Q 2）⊕Q3 3）和O O Y LE =⊕⊕⊕⊕⊕⊕⊕⊕>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>⊕⊕⊕⊕⊕⊕ 2 （I <1> I 2 Q <1> Q 3 3）或者替代地，由（ I <2> O =“SLELE”> Q <2> Q <1> 2 I SUB>）。 当检测到的信号映射到第一区域之一时，产生第一信号。 当检测到的信号映射到第二区域之一时，产生第二信号。 当第一和第二信号之间的差异超过阈值时，产生载波锁定检测信号以使能解码器。 载波锁定检测器能够以非常低的信噪比以1e-2或更大的原始BER检测载波锁定。

    Optical transmission system using Raman amplification
    3.
    发明授权
    Optical transmission system using Raman amplification 有权
    使用拉曼放大的光传输系统

    公开(公告)号：US07522842B1

    公开(公告)日：2009-04-21

    申请号：US11239148

    申请日：2005-09-30

    申请人： John McNicol ,  Kuang Tsan Wu

    发明人： John McNicol ,  Kuang Tsan Wu

    IPC分类号： H04B10/08 ,  H04B10/00 ,  H04J14/02

    CPC分类号： H04B10/2916

    摘要： A commercially viable All-Raman system, is implemented by removing the dispersion compensating Fiber (DCF) and two stage amplifier at each span, and including a transmission path dispersion compensator which performs dispersion compensation on a transmission path basis. For example, by pre-compensating for the accumulated dispersion in the electrical domain at the transmitter, the gain of the Raman pumps at each span amplifier need only compensate for the loss within the span, without needing to compensate for the loss of a DCF. In addition there is provided a low-cost method for implementing a bidirectional Service Channel by modulating/demodulating low-rate data on the Raman pump. For example, a Raman amplifier can include an information source for producing a service channel signal which includes information to be communicated; and a modulator for modulating the Raman pump signal with the service channel signal.

    摘要翻译： 通过在每个跨度处去除色散补偿光纤（DCF）和两级放大器，实现商业上可行的全拉曼系统，并且包括在传输路径基础上进行色散补偿的传输路径色散补偿器。 例如，通过预先补偿发射机电域中的累积色散，每个跨距放大器的拉曼泵的增益只需要补偿跨度内的损耗，而不需要补偿DCF的损耗。 另外，通过调制/解调拉曼泵上的低速率数据，提供了一种实现双向业务信道的低成本方法。 例如，拉曼放大器可以包括用于产生包括要传送的信息的服务信道信号的信息源; 以及用服务信道信号调制拉曼泵浦信号的调制器。

    High-speed digital signal processing in a coherent optical receiver
    7.
    发明授权
    High-speed digital signal processing in a coherent optical receiver 有权
    相干光接收机中的高速数字信号处理

    公开(公告)号：US07769305B1

    公开(公告)日：2010-08-03

    申请号：US11533940

    申请日：2006-09-21

    申请人： Kim B. Roberts ,  Han Sun ,  Chandra Bontu ,  Kuang Tsan Wu

    发明人： Kim B. Roberts ,  Han Sun ,  Chandra Bontu ,  Kuang Tsan Wu

    IPC分类号： H04B10/00

    CPC分类号： H04L7/0075 ,  H04B10/60 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/6165 ,  H04L7/0004

    摘要： In a coherent optical receiver, a frequency domain engine digitally processes at least two multi-bit sample streams of a received optical signal. The frequency domain engine includes a Fast Fourier Transform (FFT) filter for computing a complex vector representative of a frequency-domain spectrum of the received optical signal. A transpose and add block computes a vector sum of the complex vector and a transposed version of the complex vector, and an Inverse Fast Fourier Transform (IFFT) filter computes a complex output vector from the addition result. With this arrangement, parallel real filter operations are efficiently performed on each of the multi-bit sample streams, using a single back-to-back FFT-IFFT filter structure.

    摘要翻译： 在相干光接收机中，频域引擎对接收到的光信号的至少两个多比特采样数字进行数字处理。 频域引擎包括用于计算表示所接收的光信号的频域频谱的复矢量的快速傅里叶变换（FFT）滤波器。 转置和加法块计算复矢量的矢量和和复矢量的转置版本，而快速傅里叶逆变换（IFFT）滤波器根据相加结果计算复数输出矢量。 利用这种布置，使用单个背靠背FFT-IFFT滤波器结构，对每个多比特采样流有效地执行并行实际滤波器操作。

    OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK
    8.
    发明申请
    OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK 有权
    使用接收器反馈的光传输器误差减少

    公开(公告)号：US20100067902A1

    公开(公告)日：2010-03-18

    申请号：US12211216

    申请日：2008-09-16

    申请人： Han Sun ,  Kuang Tsan Wu ,  Kim B. Roberts

    发明人： Han Sun ,  Kuang Tsan Wu ,  Kim B. Roberts

    IPC分类号： H04B10/04 ,  H04B10/08 ,  H04B10/00

    CPC分类号： H04B10/0799

    摘要： Described is a method of reducing transmitter error in an optical communications channel. An optical signal transmitted from an optical transmitter that has impairment due to transmitter error is processed to generate a digitally-equalized signal. A nonlinear characteristic of the digitally-equalized signal that relates to the transmitter error is determined. An optical control signal comprising data that are based on the nonlinear characteristic is transmitted to the optical transmitter. The optical transmitter modifies a transmitter parameter in response to the optical control signal to change the nonlinear characteristic and thereby reduce the impairment.

    摘要翻译： 描述了减少光通信信道中的发射机误差的方法。 处理从发射机发生故障的光发射机发送的光信号，生成数字均衡信号。 确定与发射机误差有关的数字均衡信号的非线性特性。 包括基于非线性特性的数据的光控制信号被发送到光发射机。 光发射机根据光控信号修改发射机参数，改变非线性特性，从而减少损伤。

    Method for quadrature phase angle correction in a coherent receiver of a dual-polarization optical transport system
    9.
    发明授权
    Method for quadrature phase angle correction in a coherent receiver of a dual-polarization optical transport system 有权
    双偏振光学传输系统的相干接收机中的正交相位角校正方法

    公开(公告)号：US06917031B1

    公开(公告)日：2005-07-12

    申请号：US10778026

    申请日：2004-02-17

    申请人： Han Sun ,  Kuang Tsan Wu

    发明人： Han Sun ,  Kuang Tsan Wu

    IPC分类号： H01J40/14 ,  H04B10/148

    CPC分类号： H04B10/61 ,  H04B10/611 ,  H04B10/614 ,  H04B10/6162

    摘要： A method is provided for correcting a quadrature angle error that exists in the coherent receiver hardware of a dual-polarization optical transport system. The receiver hardware that causes the quadrature angle error is a 90 degree optical hybrid mixing device. The method involves generating an estimate of the quadrature angle error and compensating for the quadrature angle error by multiplying the first and second detected baseband signals by coefficients that are a function of the estimate of the quadrature angle error. The method is robust to severe channel distortion encountered within an optical fiber transmission channel as well as temperature effects and ageing of the 90 degree optical hybrid. The method is suited for a digital signal processing implementation in the coherent receiver when a modulation scheme used on a transmitted signal is quadriphase-shift keying (QPSK). In other embodiments, the method can be used to correct for quadrature angle error in modulation schemes such as binary PSK, M-ary PSK where M>4, or Quadrature Amplitude Modulation (QAM). The method can be implemented by an application-specific integrated circuit(ASIC).

    摘要翻译： 提供一种用于校正存在于双偏振光学传输系统的相干接收机硬件中的正交角误差的方法。 导致正交角误差的接收机硬件是90度光混合混合装置。 该方法包括产生正交角误差的估计，并通过将第一和第二检测的基带信号乘以作为正交角误差的估计的函数的系数来补偿正交角误差。 该方法对于在光纤传输通道中遇到的严重信道失真以及90度光混合器的温度效应和老化是鲁棒的。 当在发射信号上使用的调制方案是四相移键控（QPSK）时，该方法适用于相干接收机中的数字信号处理实现。 在其他实施例中，该方法可用于校正调制方案中的正交角误差，例如二进制PSK，M-ary PSK，其中M> 4或正交幅度调制（QAM）。 该方法可以由专用集成电路（ASIC）来实现。

    Clock recovery with channel coefficients
    10.
    发明授权
    Clock recovery with channel coefficients 有权
    时钟恢复与通道系数

    公开(公告)号：US08452186B2

    公开(公告)日：2013-05-28

    申请号：US13288375

    申请日：2011-11-03

    申请人： Han Sun ,  Kuang Tsan Wu ,  Kim B. Roberts

    发明人： Han Sun ,  Kuang Tsan Wu ,  Kim B. Roberts

    IPC分类号： H04B10/00

    CPC分类号： H03L7/0812 ,  H04B10/695 ,  H04L7/0087 ,  H04L7/0278

    摘要： In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal. A channel delay is estimated based on the computed compensation vectors. The estimated channel delay is subtracted from the computed compensation vectors to generate corresponding modified compensation vectors. Finally, the modified compensation vectors are used to derive a recovered clock signal.

    摘要翻译： 在光通信网络的相干光接收机中，从通过光链路接收的高速光信号中恢复时钟信号的方法。 自适应地计算一组补偿矢量，用于补偿因至少光学信号的偏振损伤而引起的符号间干扰（ISI）。 基于所计算的补偿向量来估计信道延迟。 从所计算的补偿向量中减去估计的信道延迟，以产生相应的修改的补偿向量。 最后，修正的补偿向量用于导出恢复的时钟信号。