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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：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：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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公开(公告)号：US11070312B1
公开(公告)日：2021-07-20
申请号：US16916282
申请日：2020-06-30
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.
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公开(公告)号：US10211919B2
公开(公告)日：2019-02-19
申请号：US14794944
申请日：2015-07-09
IPC分类号： H04B10/69 , H04L27/26 , H04B10/2507
摘要： In a communications system having an analog channel configured to convey a data signal from a transmitter to a receiver, a method of mitigating narrow-band impairment imposed by the analog channel on the data signal within a bounded spectral region of a spectrum of the data signal. A transmitter digital signal processor (Tx DSP) applying a first adaptation function to the data signal prior to transmitting the data signal through the analog channel. A receiver digital signal processor (Rx DSP) applying a second adaptation function to the data signal received through the analog channel. The first and second adaptation functions are selected to cooperatively mitigate effects of the narrow-band impairment imposed by the analog channel.
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公开(公告)号：US09859984B2
公开(公告)日：2018-01-02
申请号：US15281986
申请日：2016-09-30
IPC分类号： H04B10/516 , H04B10/50 , H04B10/61 , H04B10/548
CPC分类号： H04B10/516 , H04B10/505 , H04B10/548 , H04B10/616
摘要： A transmitter comprises a complex mixer to generate a single I analog drive signal and a single Q analog drive signal, and a single multi-dimensional optical modulator configured to modulate an optical carrier light using the single I analog drive signal and the single Q analog drive signal to produce a modulated optical signal for transmission. Alternatively, a transmitter comprises a complex mixer to generate two I analog drive signals and two Q analog drive signals, and a single multi-dimensional multiple-electrode optical modulator configured to modulate an optical carrier light using the analog drive signals to produce a modulated optical signal for transmission. In both transmitters, the optical carrier light is produced by a single laser, and frequency components of the first data signal are located in a different portion of a spectrum of the modulated optical signal than frequency components of the second data signal.
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公开(公告)号：US09325427B1
公开(公告)日：2016-04-26
申请号：US13664576
申请日：2012-10-31
CPC分类号： H04B10/695 , H04B10/612 , H04B10/613 , H04B10/614 , H04B10/616 , H04B10/697 , H04L1/0054
摘要： In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
摘要翻译： 在光通信系统的相干接收机中，处理检测到的符号估计以确定对应的发送数据字的最可能值的方法，所发送的数据字包括使用预定的星座图的发送机中编码的一个或多个数据比特 至少两个符号。 在与数据字的可能值相对应的判定区域中定义一组两个或更多个虚拟星座点。 处理检测到的符号估计以找到给定检测到的符号估计的最可能的虚拟星座点。 基于最可能的虚拟星座点来确定对应的传输数据字的最可能的值。
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39.发明授权公开(公告)号：US08983309B2
公开(公告)日：2015-03-17
申请号：US13371846
申请日：2012-02-13
CPC分类号： H04B10/5561
摘要： A transmitter in an optical communications system includes a digital signal processor for processing a data signal to generate a sample stream encoding successive symbols in accordance with a constrained phase modulation scheme having a constellation of at least two symbols and a modulation phase constrained to a phase range spanning less than 4π. A digital-to-analog converter converts the sample stream into a corresponding analog drive signal. A finite range phase modulator modulates a phase of a continuous wavelength channel light in accordance with the analog drive signal, to generate a modulated channel light for transmission through the optical communications system. A receiver in the optical communications system includes an optical stage for detecting phase and amplitude of the modulated channel light and for generating a corresponding sample stream, and a digital signal processor for processing the sample stream to estimate each successive symbol of the modulated channel light.
摘要翻译： 光通信系统中的发射机包括数字信号处理器，用于处理数据信号以产生根据具有至少两个符号的星座的约束相位调制方案编码连续码元的采样流，以及限制为相位范围的调制相位 跨度小于4＆pgr。 数模转换器将采样流转换成相应的模拟驱动信号。 有限范围相位调制器根据模拟驱动信号调制连续波长信道光的相位，以产生用于通过光通信系统传输的调制信道光。 光通信系统中的接收机包括用于检测调制信道光的相位和幅度并用于产生相应样本流的光学级，以及用于处理样本流以估计调制信道光的每个连续符号的数字信号处理器。
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公开(公告)号：US11451304B1
公开(公告)日：2022-09-20
申请号：US17524251
申请日：2021-11-11
IPC分类号： H04B10/61 , H04B10/2513 , H04L27/26 , H04L27/00
摘要： Upon receiving a communications signal conveying symbols at a symbol period T, a receiver applies filter coefficients to a digital representation of the communications signal, thereby generating filtered signals having a shape in the frequency domain characterized by a bandwidth expansion factor α, where components of the filtered signals correspond to angular frequencies ω = - π ( 1 + α ) T … - π ( 1 - α ) T , + π ( 1 - α ) T … + π ( 1 + α ) T . The receiver calculates first-order components from a first phase derivative of the components at a first differential distance, second-order components from a second phase derivative of the first-order components at a second differential distance, and composite second-order components from an average of the second-order components over multiple time intervals. Using the composite second-order components, the receiver calculates at least one of (i) an estimate of residual chromatic dispersion (CD) associated with the filtered signals, and (ii) an estimate of carrier frequency offset (CFO) associated with the filtered signals.
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