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11. 发明授权

US07606498B1 Carrier recovery in a coherent optical receiver 失效
标题翻译：相干光接收机中的载波恢复
公开(公告)号：US07606498B1
公开(公告)日：2009-10-20
申请号：US11366392
申请日：2006-03-03
申请人： Kuang Tsan Wu , Han Sun , Kim B. Roberts , Ruibin Jin , James Harley
发明人： Kuang Tsan Wu , Han Sun , Kim B. Roberts , Ruibin Jin , James Harley
IPC分类号： H04B10/00
CPC分类号： H04L7/0075 , H04B10/60 , H04B10/61 , H04B10/6162 , H04B10/6165 , H04L7/0004
摘要： A method of carrier recovery from a high speed optical signal received through an optical communications network. A stream of multi-bit digital samples of the optical signal is processed to generate a multi-bit estimate X′(n) of each one of a plurality of transmitted symbols. A phase of each symbol estimate X′(n) is rotated, and a respective symbol phase error Δφ(n) of the rotated symbol estimate determined.
摘要翻译：一种通过光通信网络接收的高速光信号的载波恢复方法。处理光信号的多比特数字样本流以产生多个发送符号中的每一个的多比特估计X'（n）。每个符号估计X'（n）的相位被旋转，并且确定旋转符号估计的相应符号相位误差Deltaphi（n）。

12. 发明授权

US07292653B2 Carrier lock detector 有权
标题翻译：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。}

13. 发明授权

US08135283B2 Clock recovery with channel coefficients 有权
标题翻译：时钟恢复与通道系数
公开(公告)号：US08135283B2
公开(公告)日：2012-03-13
申请号：US12419368
申请日：2009-04-07
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。

14. 发明授权

US08131148B2 Optical transmitter error reduction using receiver feedback 有权
标题翻译：使用接收机反馈的光发射机误差降低
公开(公告)号：US08131148B2
公开(公告)日：2012-03-06
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： H04B10/08 , H04B10/00 , H04B10/04 , H04B10/12
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。

15. 发明授权

US08023402B2 Low conversion rate digital dispersion compensation 有权
标题翻译：低转换率数字色散补偿
公开(公告)号：US08023402B2
公开(公告)日：2011-09-20
申请号：US12642948
申请日：2009-12-21
申请人： Kim B. Roberts , Kuang Tsan Wu , Maurice O'Sullivan , Han Sun
发明人： Kim B. Roberts , Kuang Tsan Wu , Maurice O'Sullivan , Han Sun
IPC分类号： H04J11/00
CPC分类号： H04B10/6161 , H04B10/60 , H04B10/611 , H04B10/6162 , H04B10/6971 , H04L27/2601 , H04L2025/03414 , H04L2025/03522
摘要： A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1
摘要翻译：抑制用于数字处理符号率为1 / T的高速信号的系统中的混叠效应的方法。以符号率的分数倍（N）对高速信号进行采样，其中1

16. 发明授权

US07701842B2 Low conversion rate digital dispersion compensation 有权
标题翻译：低转换率数字色散补偿
公开(公告)号：US07701842B2
公开(公告)日：2010-04-20
申请号：US12030242
申请日：2008-02-13
申请人： Kim B. Roberts , Kuang Tsan Wu , Maurice O'Sullivan , Han Sun
发明人： Kim B. Roberts , Kuang Tsan Wu , Maurice O'Sullivan , Han Sun
IPC分类号： H04J11/00
CPC分类号： H04B10/6161 , H04B10/60 , H04B10/611 , H04B10/6162 , H04B10/6971 , H04L27/2601 , H04L2025/03414 , H04L2025/03522
摘要： A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1
摘要翻译：抑制用于数字处理符号率为1 / T的高速信号的系统中的混叠效应的方法。以符号率的分数倍（N）对高速信号进行采样，其中1

17. 发明授权

US07936999B1 Automatic gain control in a coherent optical receiver 有权
标题翻译：相干光接收机中的自动增益控制
公开(公告)号：US07936999B1
公开(公告)日：2011-05-03
申请号：US11533438
申请日：2006-09-20
申请人： Mark Hawryluck , Kim B. Roberts , Kuang Tsan Wu
发明人： Mark Hawryluck , Kim B. Roberts , Kuang Tsan Wu
IPC分类号： H04B10/148
CPC分类号： H04L7/0075 , H04B10/60 , H04B10/61 , H04B10/6162 , H04B10/6165 , H04L7/0004
摘要： In a coherent optical receiver, a method of at least partially compensating Polarization Dependent Loss (PDL) of an optical signal received through an optical communications system. A respective multi-bit sample stream of each one of a pair of orthogonal received polarizations of the optical signal is tapped, and used to derive a respective metric value indicative of a quality of each multi-bit sample stream. A gain of an analog front end of the coherent optical receiver is adjusted based on the derived metric values.
摘要翻译：在相干光接收机中，至少部分补偿通过光通信系统接收的光信号的偏振相关损耗（PDL）的方法。光信号的一对正交接收极化中的每一个的相应多位采样流被抽头，并用于导出指示每个多位采样流的质量的相应度量值。基于导出的度量值来调整相干光接收机的模拟前端的增益。

18. 发明授权

US07522842B1 Optical transmission system using Raman amplification 有权
标题翻译：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。

19. 发明授权

US06917031B1 Method for quadrature phase angle correction in a coherent receiver of a dual-polarization optical transport system 有权
标题翻译：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。

20. 发明授权

US07315575B2 Equalization strategy for dual-polarization optical transport system 有权
标题翻译：双偏光光学传输系统的均衡策略
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。

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