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公开(公告)号：US07245582B1
公开(公告)日：2007-07-17
申请号：US09875154
申请日：2001-06-07
申请人： Kim B. Roberts , Dino B. Fatica
发明人： Kim B. Roberts , Dino B. Fatica
CPC分类号： H04J14/0227 , H04J14/0283 , H04J14/0284 , H04J14/0286 , H04J14/0291 , H04J14/0295 , H04L49/15 , H04L49/1515 , H04L49/552 , H04L49/557
摘要： A network node includes a system enabling high-speed protection switching of traffic between respectively associated working and protection channels of a communications network. The node comprises a multi-stage switch fabric, an interface, and a toggle. The multi-stage switch fabric has a first stage including a respective plurality of stage-1 switch elements. The interface is operatively coupled to a set of one or more stage-1 switch elements, and is adapted to aggregate the working and protection channels of the communications network on a selected one of the set of stage-1 switch elements. Finally, the toggle is adapted to control the selected stage-1 switch element to map traffic between a middle stage of the switch fabric and a selected one of the working and protection channels.
摘要翻译： 网络节点包括能够在通信网络的相关联的工作和保护信道之间高速保护交换业务的系统。 节点包括多级交换结构，接口和切换。 多级交换结构具有包括相应的多个一级开关元件的第一级。 该接口可操作地耦合到一组一个或多个第一级开关元件，并且适于将通信网络的工作和保护信道聚集在所述一组一级开关元件中的所选择的一个上。 最后，该切换适用于控制所选择的第一级交换机元件以在交换结构的中间阶段与所选择的工作和保护信道中的流量进行映射。
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公开(公告)号：US11239929B1
公开(公告)日：2022-02-01
申请号：US17203332
申请日：2021-03-16
IPC分类号： H04B3/46 , H04B17/318
摘要： A receiver is configured to detect, at a communication interface, a received signal that suffers from degradations incurred over a communication channel. The receiver applies an adaptive filter to a series of received blocks of a digital representation of the received signal, thereby generating respective filtered blocks, where each received block represents 2N frequency bins, and where N is a positive integer. The receiver calculates coefficients for use by the adaptive filter on a jth received block as a function of (i) error estimates associated with an (j−D−1)th filtered block, where D is a positive integer representing a number of blocks, and where j is a positive integer greater than (D−1); and (ii) an inverse of an approximate covariance matrix associated with the (j−D−1)th received block, where the approximate covariance matrix is a diagonal matrix of size L×L, and where L is a positive integer lower than 2N.
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公开(公告)号：US11233568B1
公开(公告)日：2022-01-25
申请号：US17090135
申请日：2020-11-05
IPC分类号： H04B10/06 , H04B10/2507 , H04B10/2569 , H04B10/67 , H04B10/532 , H04B10/69
摘要： A receiver is configured to detect, at a communication interface, a received signal that suffers from degradations incurred over a communication channel. The receiver applies an adaptive filter to a series of received blocks of a digital representation of the received signal, thereby generating respective filtered blocks. The receiver calculates coefficients for use by the adaptive filter on an jth received block as a function of (i) error estimates associated with an (j−D−1)th filtered block, where D is a positive integer representing a number of blocks, and where j is a positive integer greater than (D−1); and (ii) delay compensation terms dependent on an estimate of a difference between coefficients used by the adaptive filter on an (j−D−1)th received block and coefficients used by the adaptive filter on an (j−1)th received block
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公开(公告)号：US11082157B2
公开(公告)日：2021-08-03
申请号：US16666520
申请日：2019-10-29
摘要： A system is configured to measure a forward error correction (FEC) decoding property associated with applying FEC decoding to FEC-encoded bits or symbols at a receiver device deployed in a communication network. The system is further configured to provide an assessment of operating conditions of the receiver device based on the FEC decoding property. In one example, the FEC decoding property comprises a distribution of a number of iterations of a FEC decoding operation applied to a plurality of FEC blocks processed within a period of time. In some examples, the FEC decoding property comprises any one of heat, temperature, current, voltage, active clock cycles, idle clock cycles, activity of parallel engines, activity of pipeline stages, and input or output buffer fill level of the FEC decoding. In some examples, the assessment is based on a comparison between the FEC decoding property and reference FEC data.
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公开(公告)号：US10200149B2
公开(公告)日：2019-02-05
申请号：US15250553
申请日：2016-08-29
申请人： Kim B. Roberts , Amir K. Khandani
发明人： Kim B. Roberts , Amir K. Khandani
摘要： A super-frame for transmission in an optical communications system comprises two or more data frames and a parity frame. All frames in the super-frame have been encoded in accordance with a first Forward Error Correction (FEC) scheme. The parity frame is computed over the two or more data frames (prior to or concurrently with or after encoding via the first FEC scheme) according to a second FEC scheme. At a receiver, the super-frame is decoded in accordance with the first FEC scheme to generate a set of FEC decoded frames in which residual errors are clustered, that is, are non-Poisson. The second FEC scheme, which is particularly suited or designed to correct the clustered non-Poisson residual errors, is used to correct the residual errors.
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公开(公告)号：US20180343078A1
公开(公告)日：2018-11-29
申请号：US15796393
申请日：2017-10-27
IPC分类号： H04J14/02 , H04B10/079 , H04Q11/00 , H04B10/58
CPC分类号： H04J14/0221 , H04B10/0793 , H04B10/07955 , H04B10/2543 , H04B10/255 , H04B10/2557 , H04B10/58 , H04B2210/254 , H04J14/0275 , H04Q11/0066 , H04Q2011/0041 , H04Q2011/0083
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.
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公开(公告)号：US20180343058A1
公开(公告)日：2018-11-29
申请号：US15603810
申请日：2017-05-24
申请人： James Harley , Kim B. Roberts , David Boertjes
发明人： James Harley , Kim B. Roberts , David Boertjes
IPC分类号： H04B10/25 , H04B10/079 , H04J14/02 , H04B10/27
摘要： Adjustment of one or more control parameters of a section of an optical fiber network involves taking measurements of optical signals in the section, deriving estimated data from the measurements and from knowledge of the section, where the estimated data is a function of optical nonlinearity and of amplified spontaneous emission, and applying one or more control algorithms using the estimated data to adjust the one or more control parameters.
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公开(公告)号：US09461751B2
公开(公告)日：2016-10-04
申请号：US13718211
申请日：2012-12-18
IPC分类号： H04B10/548 , H04B10/40 , H04B10/61
CPC分类号： H04B10/516 , H04B10/505 , H04B10/548 , H04B10/616
摘要： A method of transmitting a data signal in an optical communications system. The method includes processing the data signal to generate an analog drive signal, wherein the processing comprises applying a first non-linear operation such that frequency components of the drive signal lay in at least two separated spectral bands. An optical carrier light is modulated using the analog drive signal.
摘要翻译： 一种在光通信系统中发送数据信号的方法。 该方法包括处理数据信号以产生模拟驱动信号，其中该处理包括施加第一非线性操作，使得驱动信号的频率分量位于至少两个分离的频谱带中。 使用模拟驱动信号调制光载波。
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公开(公告)号：US08929749B2
公开(公告)日：2015-01-06
申请号：US13253331
申请日：2011-10-05
IPC分类号： H04B10/06 , H04L27/38 , H04B10/61 , H04L27/227
CPC分类号： H04B10/6165 , H04L27/2271 , H04L27/3836
摘要： Methods and systems of data symbol recovery in a coherent optical receiver of an optical communications system. A respective probabilistic phase error is calculated for each of a plurality of data symbol estimates. A phase rotation is calculated based on the probabilistic phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. Each rotated symbol estimate is processed to generate corresponding decision values of each data symbol.
摘要翻译： 光通信系统的相干光接收机中数据符号恢复的方法和系统。 针对多个数据符号估计中的每一个计算相应的概率相位误差。 基于使用滤波函数的概率相位误差估计，以及施加到至少一个数据符号估计的相位旋转来生成相应的旋转符号估计来计算相位旋转。 处理每个旋转的符号估计以产生每个数据符号的相应决定值。
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公开(公告)号：US08805206B2
公开(公告)日：2014-08-12
申请号：US12893294
申请日：2010-09-29
IPC分类号： H04B10/06
CPC分类号： H04B10/64 , H04B10/613 , H04B10/614
摘要： In a coherent optical receiver of an optical communications system, methods and systems for receiving a data signal x(t) modulated on an optical signal. A linearly polarized LO light is generated, which has a frequency of f1=f0±Δf, where f0 is a frequency of a narrowband carrier of the optical signal, and Δf corresponds with a band-width fB of the data signal x(t). The LO light and a received light of the optical signal are heterodyned on a photodetector. An analog signal generated by the photodetector is low-pass filtered to generate a filtered signal, using a filter characteristic having a sharp cut-off at a frequency of Δf+nfB, where n is an integer multiple. An analog-to digital (A/D) converter samples the filtered signal at a sample rate of 2(Δf+nfB) to generate a corresponding multi-bit digital sample stream. The multi-bit digital sample stream is digitally processed to recover respective In-Phase and Quadrature components of the received light of the optical signal.
摘要翻译： 在光通信系统的相干光接收机中，用于接收在光信号上调制的数据信号x（t）的方法和系统。 产生线偏振的LO光，其具有f1 = f0±＆Dgr; f的频率，其中f0是光信号的窄带载波的频率，＆Dgr; f对应于数据信号的带宽fB x（t）。 LO光和光信号的接收光在光电检测器上被外差。 由光电检测器产生的模拟信号被低通滤波以产生滤波信号，使用具有频率为＆Dgr; f + nfB的尖锐截止频率的滤波器特性，其中n是整数倍。 模数（A / D）转换器以2（＆Dgr; f + nfB）的采样率对滤波后的信号进行采样，以产生相应的多位数字采样流。 数字处理多位数字采样流以恢复光信号的接收光的各自的同相和正交分量。
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