公开(公告)号：US20070092259A1

公开(公告)日：2007-04-26

申请号：US11294613

申请日：2005-12-06

申请人： Chandra Bontu ,  Maurice O'Sullivan ,  Kim Roberts ,  Han Sun ,  Kuang Wu

发明人： Chandra Bontu ,  Maurice O'Sullivan ,  Kim Roberts ,  Han Sun ,  Kuang Wu

IPC分类号： H04B10/12

CPC分类号： H04B10/2572 ,  H04B10/60 ,  H04B10/6161 ,  H04B10/6162 ,  H04B10/64 ,  H04J14/06 ,  H04L7/041

摘要： A method of processing a stream of digital samples of an optical signal received by a coherent optical receiver. The digital sample stream is processed to generate a dispersion compensated sample stream. The dispersion compensated sample stream is then processed to compensate polarization dependent impairments of the optical signal.

摘要翻译： 一种处理由相干光接收机接收的光信号的数字样本流的方法。 数字样本流被处理以产生色散补偿样本流。 然后处理色散补偿采样流以补偿光信号的偏振相关损伤。

公开(公告)号：US07315575B2

公开(公告)日：2008-01-01

申请号：US10793801

申请日：2004-03-08

申请人： Han Sun ,  Kuang Tsan Wu

发明人： Han Sun ,  Kuang Tsan Wu

IPC分类号： H03D1/04

CPC分类号： H04B10/2572 ,  H04B10/6162

摘要： A method is provided for an equalization strategy for compensating channel distortions in a dual-polarization optical transport system wherein the received signal includes a complex signal of a first transmitted polarization component and a complex signal of a second transmitted polarization component. In a first step, a blind self recovery mode used a blind adaptation algorithm in calculating and modifying multiple complex equalizer transfer function coefficients to enables recovery of only the complex signal of the first transmitted polarization component. In a second step, equalization is performed in a training mode for recovery of the complex signals of the first and second transmitted polarization components. In a third step, equalization is performed in a data directed mode. The method is suited for a digital signal processing implementation in a coherent receiver.

摘要翻译： 提供了一种用于补偿双偏振光学传输系统中的信道失真的均衡策略的方法，其中接收信号包括第一透射偏振分量的复信号和第二透射偏振分量的复信号。 在第一步骤中，盲自恢复模式使用盲适应算法来计算和修改多个复均衡器传递函数系数，以仅恢复第一透射偏振分量的复信号。 在第二步骤中，在用于恢复第一和第二透射偏振分量的复信号的训练模式中执行均衡。 在第三步骤中，以数据定向模式执行均衡。 该方法适用于相干接收机中的数字信号处理实现。

公开(公告)号：US20060285855A1

公开(公告)日：2006-12-21

申请号：US11315345

申请日：2005-12-23

申请人： Han Sun ,  Slobodan Jovanovic ,  Kuang Wu ,  Chandra Bontu ,  Kim Roberts ,  Jianzhong Xu

发明人： Han Sun ,  Slobodan Jovanovic ,  Kuang Wu ,  Chandra Bontu ,  Kim Roberts ,  Jianzhong Xu

IPC分类号： H04B10/00

CPC分类号： H04B10/508 ,  H03L7/085 ,  H03L2207/06 ,  H04J14/06 ,  H04L7/0029 ,  H04L7/0083 ,  H04L7/0278

摘要： A method of recovering a clock signal from an optical signal received through an optical communications system. A digital sample stream is processed to generate a dispersion compensated signal. The dispersion compensated signal is then tapped to obtain upper side band and lower side, band signals of each received polarization of the optical signal. The upper side band sand lower side band signals are then processed to compensate polarization dependent impairments and the clock recovered from the resulting optimized.

摘要翻译： 一种从通过光通信系统接收的光信号中恢复时钟信号的方法。 处理数字样本流以产生色散补偿信号。 然后分散色散补偿信号以获得光信号的每个接收极化的上边带和下侧的带信号。 然后处理上边带砂下边带信号以补偿偏振相关损伤，并从所得优化中恢复时钟。

公开(公告)号：US20050201492A1

公开(公告)日：2005-09-15

申请号：US10796152

申请日：2004-03-10

申请人： Kuang Wu ,  Han Sun ,  John McNicol

发明人： Kuang Wu ,  Han Sun ,  John McNicol

IPC分类号： H04L27/22

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 {overscore (Q1⊕Q2)}·(I1{overscore (I2I3)}+{overscore (I1)}I2I3)+({overscore (I1⊕I2)})·(Q1{overscore (Q2Q3)}+{overscore (Q1)}Q2Q3), or alternatively, by ({overscore (I1⊕I2)}·{overscore (Q2⊕Q3)})+({overscore (Q1⊕Q2)}·{overscore (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了一种锁定检测算法，该检测算法将检测到的信号映射到与由（I 2 / （Q 2）⊕Q3 3）和（超core SUB SUB SUB SUB⊕SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB >）}。（I _{1 {overscore（I 2 3 }} ）}（{overscore（I＆lt; 1＆lt; 1＆lt; 2＆gt; 2＆gt;}}）（ Q （过大的（Q 2）3 Q 3）} + {overscore（Q 1> 1 ）} Q “1”>“3”）}）。 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。}

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。}

公开(公告)号：US20060285854A1

公开(公告)日：2006-12-21

申请号：US11315342

申请日：2005-12-23

申请人： Han Sun ,  Slobodan Jovanovic ,  Kuang Wu ,  Chandra Bontu ,  Kim Roberts ,  Jianzhong Xu

发明人： Han Sun ,  Slobodan Jovanovic ,  Kuang Wu ,  Chandra Bontu ,  Kim Roberts ,  Jianzhong Xu

IPC分类号： H04B10/00

CPC分类号： H04B10/508 ,  H03L7/085 ,  H03L2207/06 ,  H04J14/06 ,  H04L7/0029 ,  H04L7/0083 ,  H04L7/0278

摘要： A method of recovering a clock signal from an optical signal received through an optical communications system. A digital sample stream is processed to generate a dispersion compensated signal. The dispersion compensated signal is then tapped to obtain upper side band and lower side band signals of each received polarization of the optical signal. The upper side band and lower side band signals are then processed to compensate polarization dependent impairments, and the clock recovered from the resulting optimized.

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。

公开(公告)号：US08005368B2

公开(公告)日：2011-08-23

申请号：US11950585

申请日：2007-12-05

申请人： Kim Roberts ,  Han Sun

发明人： Kim Roberts ,  Han Sun

IPC分类号： H04B10/00

CPC分类号： H04B10/6971 ,  H04B10/2569 ,  H04B10/2572 ,  H04B10/532 ,  H04B10/677

摘要： A signal equalizer for compensating impairments of an optical signal received through a link of a high speed optical communications network. At least one set of compensation vectors are computed for compensating at least two distinct types of impairments. A frequency domain processor is coupled to receive respective raw multi-bit in-phase (I) and quadrature (Q) sample streams of each received polarization of the optical signal. The frequency domain processor operates to digitally process the multi-bit sample streams, using the compensation vectors, to generate multi-bit estimates of symbols modulated onto each transmitted polarization of the optical signal. The frequency domain processor exhibits respective different responses to each one of the at least two distinct types of impairments.

摘要翻译： 一种信号均衡器，用于补偿通过高速光通信网络的链路接收的光信号的损伤。 计算至少一组补偿向量以补偿至少两种不同类型的损伤。 频域处理器被耦合以接收光信号的每个接收极化的相应的原始多位同相（I）和正交（Q）采样流。 频域处理器操作以使用补偿矢量对多位采样流进行数字处理，以产生调制到光信号的每个透射偏振上的符号的多位估计。 所述频域处理器对所述至少两种不同类型的损伤中的每一种表现出相应的不同响应。

公开(公告)号：US20070092260A1

公开(公告)日：2007-04-26

申请号：US11328199

申请日：2006-01-10

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

发明人： Chandra Bontu ,  Kuang Wu ,  John McNicol ,  Kim 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。

公开(公告)号：US20050196176A1

公开(公告)日：2005-09-08

申请号：US10793801

申请日：2004-03-08

申请人： Han Sun ,  Kuang Wu

发明人： Han Sun ,  Kuang Wu

IPC分类号： H04B10/00

CPC分类号： H04B10/2572 ,  H04B10/6162

摘要： A method is provided for an equalization strategy for compensating channel distortions in a dual-polarization optical transport system wherein the received signal includes a complex signal of a first transmitted polarization component and a complex signal of a second transmitted polarization component. In a first step, a blind self-recovery mode used a blind adaptation algorithm in calculating and modifying multiple complex equalizer transfer function coefficients to enable recovery of only the complex signal of the first transmitted polarization component. By recovering only a single polarization component in the first step the degenerate case of recovering only a single transmitted signal at both polarization component outputs of an equalizer is prevented. In a second step, equalization is performed in a training mode for calculating and modifying the multiple complex equalizer transfer function coefficients to enable recovery of the complex signals of the first and second transmitted polarization components. In a third step, equalization is performed in a data directed mode for continuing to calculate and modify the multiple complex equalizer transfer function coefficients to ensure continued recovery of the complex signals of the first and second transmitted polarization components. The method is suited for a digital signal processing implementation in a coherent receiver when a modulation scheme used on a transmitted signal is quadriphase-shift keying (QPSK). In other embodiments, the method can be used with modulation schemes such as binary PSK, M-ary PSK where M>4, or Quadrature Amplitude Modulation (QAM).

摘要翻译： 提供了一种用于补偿双极化光传输系统中的信道失真的均衡策略的方法，其中接收信号包括第一透射偏振分量的复信号和第二透射偏振分量的复信号。 在第一步中，盲自恢复模式使用盲适应算法来计算和修改多个复均衡器传递函数系数，以使得仅恢复第一透射偏振分量的复信号。 通过在第一步骤中仅恢复单个偏振分量，防止在均衡器的两个偏振分量输出处仅恢复单个发射信号的简并情况。 在第二步骤中，在用于计算和修改多个复均衡器传递函数系数的训练模式中执行均衡，以使得能够恢复第一和第二透射偏振分量的复信号。 在第三步骤中，以数据定向模式执行均衡，以继续计算和修改多个复均衡器传递函数系数，以确保第一和第二透射偏振分量的复信号的持续恢复。 当在发送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，该方法可以与诸如二进制PSK，M-ary PSK，其中M> 4或正交幅度调制（QAM）的调制方案一起使用。