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21. 发明授权

US07894728B1 Sample timing control in an optical receiver 有权
标题翻译：光接收机中的采样定时控制
公开(公告)号：US07894728B1
公开(公告)日：2011-02-22
申请号：US11550042
申请日：2006-10-17
申请人： Han Sun , Chandra Bontu , Kim B. Roberts , John Sitch , John Wolczanski
发明人： Han Sun , Chandra Bontu , Kim B. Roberts , John Sitch , John Wolczanski
IPC分类号： H04B10/06
CPC分类号： H04L7/0075 , H04B10/60 , H04B10/61 , H04B10/6162 , H04B10/6165 , H04L7/0004
摘要： A method of compensating phase error between parallel digital signals of a received optical signal, in a coherent optical receiver. A phase differential between the digital signals is determined. A digital skew is imposed between the digital signals, an amount of skew imposed being an integer number of sample periods calculated to most nearly compensate the phase differential. The skewed digital signals are then digitally processed, in the frequency domain, to compensate a residual portion of the phase differential.
摘要翻译：在相干光接收机中补偿接收光信号的并行数字信号之间的相位误差的方法。确定数字信号之间的相位差。在数字信号之间施加数字偏移，施加的倾斜量是被计算为最接近地补偿相位差的整数个采样周期。然后在频域中数字地处理偏斜的数字信号，以补偿相位差的剩余部分。

22. 发明授权

US07769305B1 High-speed digital signal processing in a coherent optical receiver 有权
标题翻译：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。

23. 发明申请

US20100067902A1 OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK 有权
标题翻译：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。

24. 发明授权

US07680420B1 Optical E-field modulation using a directly driven laser 有权
标题翻译：使用直接驱动激光的光学电场调制
公开(公告)号：US07680420B1
公开(公告)日：2010-03-16
申请号：US10872850
申请日：2004-06-21
申请人： Dave Walker , Kim B. Roberts , Maurice O'Sullivan , Leo Strawczynski , James Whiteaway , Christopher Fludger , Han Henry Sun , Adrien Comeau
发明人： Dave Walker , Kim B. Roberts , Maurice O'Sullivan , Leo Strawczynski , James Whiteaway , Christopher Fludger , Han Henry Sun , Adrien Comeau
IPC分类号： H04B10/00
CPC分类号： H04B10/5051 , H04B10/25137
摘要： A method of synthesizing a modulated optical signal using a laser cascaded with an amplitude modulator. A phase drive signal VF(t) is derived for driving the laser to generate an optical carrier signal with a desired phase φ(t). An amplitude drive signal VS(t) is then derived for driving the amplitude modulator to impose a desired amplitude S(t) onto the optical carrier signal generated by the laser. The amplitude drive signal VS(t) is compensated for amplitude modulation of the optical carrier signal generated by the laser.
摘要翻译：使用与幅度调制器级联的激光来合成调制光信号的方法。导出相位驱动信号VF（t），用于驱动激光器以产生具有期望相位（t）的光载波信号。然后导出幅度驱动信号VS（t），用于驱动幅度调制器，以将期望的振幅S（t）施加到由激光器产生的光载波信号上。振幅驱动信号VS（t）被补偿由激光器产生的光载波信号的幅度调制。

25. 发明授权

US07561797B1 Optical signal transmitter with active optical e-field degradation 有权
标题翻译：具有主动光电子场退化的光信号发射器
公开(公告)号：US07561797B1
公开(公告)日：2009-07-14
申请号：US11362756
申请日：2006-02-28
申请人： James Harley , Kim B. Roberts
发明人： James Harley , Kim B. Roberts
IPC分类号： H04B10/08 , H04B10/04
CPC分类号： H04B10/0793
摘要： A method and system for controlling optical signal to noise ratio (OSNR) of an optical signal at a receiver end of an optical link. A multi-bit sample stream is generated using a compensation function adapted to compensate impairments of the optical link A digital noise signal is generated and added to the multi-bit sample stream, and the resulting signal used to generate a degraded optical signal, which is then transmitted through the optical link.
摘要翻译：一种用于控制光链路的接收机端的光信号的光信噪比（OSNR）的方法和系统。使用适于补偿光链路的损伤的补偿功能来生成多比特采样流。数字噪声信号被生成并添加到多比特采样流，并且所产生的信号用于产生劣化的光信号，其是然后通过光链路传输。

26. 发明授权

US07162536B1 Validation of a connection between arbitrary end-nodes in a communications network 有权
标题翻译：验证通信网络中任意端节点之间的连接
公开(公告)号：US07162536B1
公开(公告)日：2007-01-09
申请号：US09597974
申请日：2000-06-20
申请人： Kim B. Roberts , Ronald J. Gagnon , Malcolm Betts
发明人： Kim B. Roberts , Ronald J. Gagnon , Malcolm Betts
IPC分类号： H04L9/00
CPC分类号： H04L1/245 , H04J3/14 , H04J3/1611 , H04J2203/006 , H04J2203/0089 , H04J2203/0096 , H04L1/004
摘要： An OP-N connection is mapped through a communications network between first and second end-nodes via at least one intermediate node. The integrity and validity of the OP-N connection can be determined independently of SONET/SDH lines, sections or paths mapped through the network, and potentially utilizing bandwidth of the OP-N connection. Validation of the OP-N connection can be accomplished by inserting performance monitor (PM) information into a data signal at the first end-node. In some embodiments, the PM information is inserted into an unused portion of the transport overhead (TOH) of a SONET/SDH data signal. At each intermediate node between the first and second end-nodes, the PM information is extracted from the data signal, buffered while the data signal is pointer processed, and the reinserted before forwarding the data signal. Finally, a the second end-point, the PM information is extracted and examined. Multiple levels of OP-N connections are supported, with each level being provided with a respective set of PM information.
摘要翻译：通过至少一个中间节点通过第一和第二终端节点之间的通信网络映射OP-N连接。可以独立于通过网络映射的SONET / SDH线路，部分或路径以及潜在地利用OP-N连接的带宽来确定OP-N连接的完整性和有效性。可以通过将性能监视（PM）信息插入到第一个终端节点的数据信号来实现OP-N连接的验证。在一些实施例中，将PM信息插入SONET / SDH数据信号的传输开销（TOH）的未使用部分。在第一和第二终端之间的每个中间节点处，从数据信号中提取PM信息，缓冲数据信号被指针处理，并在转发数据信号之前重新插入。最后，在第二个终点，提取和检查PM信息。支持多层次的OP-N连接，每级都提供相应的一组PM信息。

27. 发明授权

US07002986B1 Mapping arbitrary signals into SONET 有权
标题翻译：将任意信号映射到SONET
公开(公告)号：US07002986B1
公开(公告)日：2006-02-21
申请号：US09349087
申请日：1999-07-08
申请人： Kim B. Roberts
发明人： Kim B. Roberts
IPC分类号： H04J3/16 , H04J3/18 , H04L12/28
CPC分类号： H04J3/1629 , H04J3/1611
摘要： A synchronizer/de-synchronizer maps continuous format signals of an arbitrary rate into frames of pre-selected single common rate, such as SONET frames, with no bits changed and very little jitter or wander added. In this way, the continuous format signal may be carried transparently as a tributary of a SONET network. Each frame comprises a definite number of fixed stuff bits, including transport overhead bits and reminder fixed stuff bits. A frame also comprises an adjustable number of adaptive stuff bits, resulting from the phase difference between the arbitrary rate and the common rate. A mapping function is performed in a tributary unit shelf of a SONET transport shelf, and the reverse mapping function is performed in a similar way at the far end of a SON ET connection. The stuff bits are spread uniformly within the frame.
摘要翻译：同步器/去同步器将任意速率的连续格式信号映射到预先选择的单个公共速率的帧，例如SONET帧，而不改变位，并且添加非常小的抖动或漂移。以这种方式，连续格式信号可以作为SONET网络的支路透明地携带。每个帧包括一定数量的固定填充位，包括传输开销位和提醒固定填充位。帧还包括可调数量的自适应填充位，由任意速率和公共速率之间的相位差产生。在SONET传输架的支路单元架中执行映射功能，并且以类似的方式在SONET连接的远端执行反向映射功能。填充位在帧内均匀分布。

28. 发明授权

US11070312B1 Compression forward error correction coding using a tree structure 有权
公开(公告)号：US11070312B1
公开(公告)日：2021-07-20
申请号：US16916282
申请日：2020-06-30
申请人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
发明人： Shahab Oveis Gharan , Mohammad Ehsan Seifi , Kim B. Roberts
IPC分类号： H04L1/00 , H03M13/00 , H03M13/13 , H03M13/11
摘要： A transmitter generates determiners from data vectors representing payload information, each determiner representing parity information dependent on the payload information. The transmitter encodes the determiners to generate a nub vector representing compressed parity information dependent on the parity information, wherein the encoding is mathematically equivalent to calculating three or more forward error correction (FEC) codewords from the determiners and then calculating the nub vector from the codewords, at least one of the codewords being calculated from at least one recursion of a mathematical operation, and at least one of the codewords comprising more than 6 terms. The transmitter transmits signals representing the data vectors and the nub vector to a receiver, where recovery of the data vectors at the receiver involves sequential decoding of the FEC codewords, wherein at least one codeword decoded earlier in the decoding enhances an estimate of at least one codeword decoded later in the decoding.

29. 发明授权

US10439751B2 Power control in an optical fiber network 有权
公开(公告)号：US10439751B2
公开(公告)日：2019-10-08
申请号：US15796393
申请日：2017-10-27
申请人： Kim B. Roberts , James Harley , Qunbi Zhuge , Michael Andrew Reimer , Maurice O'Sullivan
发明人： Kim B. Roberts , James Harley , Qunbi Zhuge , Michael Andrew Reimer , Maurice O'Sullivan
IPC分类号： H04B10/079 , H04B10/294 , H04J14/02 , H04Q11/00 , H04B10/58 , H04B10/2557 , H04B10/255
摘要： Multiple receivers are comprised in a flexible coherent transceiver of a multi-span optical fiber network. Each of the multiple receivers is operative to handle communications on a respective channel. The multiple receivers measure optical characteristics. For each of the multiple receivers, the optical characteristics include optical nonlinear interactions on the respective channel, the optical nonlinear interactions being at least partially dependent from one span to another span. An optical power of a signal on each of the multiple channels is adjusted as a function of the optical characteristics.

30. 发明授权

US10419109B1 Pseudo frequency division multiplexing 有权
公开(公告)号：US10419109B1
公开(公告)日：2019-09-17
申请号：US16124479
申请日：2018-09-07
申请人： Shahab Oveis Gharan , Michael Andrew Reimer , Andrew D. Shiner , Hamid Ebrahimzad , Maurice O'Sullivan , Kim B. Roberts
发明人： Shahab Oveis Gharan , Michael Andrew Reimer , Andrew D. Shiner , Hamid Ebrahimzad , Maurice O'Sullivan , Kim B. Roberts
IPC分类号： H04B10/00 , H04B10/079 , H04J14/00 , H04B10/50 , H04B10/66
摘要： An optical transmitter is operable to generate an optical signal by modulating a number N of frequency divisional multiplexing (FDM) subcarriers using transformed digital signals which are determined by applying a pseudo FDM (pFDM) transformation to preliminary digital signals representative of multi-bit symbols. Rather than experiencing the effects of the number N of FDM channels, the optical signal experiences the effects of a different number M of pFDM channels, where M≠N. In some examples, the number M of pFDM channels is less than the number N of FDM channels, and frequency-dependent degradations may be averaged across different symbol streams. In other examples, the number M of pFDM channels is greater than the number N of FDM channels, and different symbol streams may experience different frequency-dependent degradations. An optical receiver is operable to apply an inverse pFDM transformation in order to recover estimates of the multi-bit symbols.

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