公开(公告)号：US20150037034A1

公开(公告)日：2015-02-05

申请号：US14380252

申请日：2013-03-21

申请人： Alcatel Lucent

发明人： Jeremie Renaudier ,  Oriol Bertran-Pardo

IPC分类号： H04J14/02 ,  H04B10/508 ,  H04B10/67 ,  H04J14/06

CPC分类号： H04J14/02 ,  H04B10/0799 ,  H04B10/508 ,  H04B10/6166 ,  H04B10/67 ,  H04J14/0258 ,  H04J14/026 ,  H04J14/0273 ,  H04J14/0275 ,  H04J14/06 ,  H04L1/0035 ,  H04L25/0288

摘要： The present document relates to optical communication systems. In particular, the present document relates to high efficiency wavelength division multiplexing (WDM) optical communication systems. An optical transmitter (210) adapted to transmit an optical signal on an optical wavelength division multiplexed, referred to as WDM, transmission channel (111) to a corresponding optical receiver (230) is described. The optical transmitter (210) comprises a profiling unit (217) adapted to receive information regarding an equalization filter (270) adapted at the corresponding optical receiver (230), based on a first optical signal received from the optical transmitter (210); a pulse shaping filter unit (212) adapted to filter a sequence of data symbols (211) using a pulse shaping filter, thereby yielding a filtered sequence of data symbols (211); wherein a frequency response (404, 405) of the pulse shaping filter depends on the information regarding the equalization filter (270); and a digital-to-optical converter (214, 215 216) adapted to convert the filtered sequence of data symbols (211) into a second optical signal to be transmitted to the optical receiver (230).

摘要翻译： 本文件涉及光通信系统。 特别地，本文件涉及高效率波分复用（WDM）光通信系统。 描述了适于将光信号在光波分复用（称为WDM）传输信道（111）发送到对应的光接收器（230）的光发射机（210）中。 所述光发射器（210）包括一个轮廓单元（217），适于基于从所述光发射器（210）接收的第一光信号，接收关于在对应的光接收机（230）上适配的均衡滤波器（270）的信息; 脉冲整形滤波器单元，适于使用脉冲整形滤波器对数据符号序列（211）进行滤波，从而产生经过滤波的数据符号序列（211）; 其中所述脉冲整形滤波器的频率响应（404,405）取决于关于所述均衡滤波器（270）的信息; 以及适于将经过滤波的数据符号序列（211）转换为要发送到光接收器（230）的第二光信号的数模转换器（214,215 216）。

公开(公告)号：US20140233949A1

公开(公告)日：2014-08-21

申请号：US14066620

申请日：2013-10-29

申请人： ZTE Corporation

发明人： Hung-Chang Chien ,  Jianjun Yu ,  Ze Dong

IPC分类号： H04B10/61

CPC分类号： H04B10/6166 ,  H04B10/532 ,  H04B10/61

摘要： An optical transmitter transmits a dual polarization optical Nyquist frequency domain multiplexed signal. The signal includes a first polarization component and a second polarization component. Each component comprises multiple subchannels, possibly having different subchannel bandwidths and different modulation schemes. An optical receiver receives the signal and recovers transmitted data.

摘要翻译： 光发射机发射双极化奈奎斯特频域多路复用信号。 信号包括第一偏振分量和第二偏振分量。 每个组件包括多个子信道，可能具有不同的子信道带宽和不同的调制方案。 光接收器接收信号并恢复发送的数据。

公开(公告)号：US08744279B2

公开(公告)日：2014-06-03

申请号：US13205437

申请日：2011-08-08

申请人： Fan Mo ,  Sameep Dave ,  Lawrence W. Esker

发明人： Fan Mo ,  Sameep Dave ,  Lawrence W. Esker

IPC分类号： H04B10/06

CPC分类号： H04B10/6165 ,  H04B10/2569 ,  H04B10/613 ,  H04B10/6166 ,  H04B10/6971 ,  H04L25/03057

摘要： Polarization mode dispersion (PMD) in a dual-pole optical communications network is compensated for using an adaptive PMD equalizer. The PMD equalizer may include a number of substantially identical filter modules that provide partial outputs which may be combined to form a PMD compensated output. A constant modulus algorithm (CMA)-based equalizer may track PMD across both poles and generates an error signal. The CMA-based equalizer includes a filter bank, and uses an update algorithm and tap/output adjustments based on a difference between combined tap energies and an index, and feedback from a forward error correction code frame synchronizer.

摘要翻译： 使用自适应PMD均衡器来补偿双极光通信网络中的极化模式色散（PMD）。 PMD均衡器可以包括多个基本相同的滤波器模块，其提供可以组合以形成PMD补偿输出的部分输出。 基于恒模算法（CMA）的均衡器可以跟踪两极的PMD并产生误差信号。 基于CMA的均衡器包括滤波器组，并且使用基于组合抽头能量和索引之间的差的更新算法和抽头/输出调整以及来自前向纠错码帧同步器的反馈。

公开(公告)号：US08682180B1

公开(公告)日：2014-03-25

申请号：US13356177

申请日：2012-01-23

申请人： Matthew Nimon ,  Fan Mo ,  William Thesling

发明人： Matthew Nimon ,  Fan Mo ,  William Thesling

IPC分类号： H04B10/00

CPC分类号： H04B10/6165 ,  H04B10/2569 ,  H04B10/613 ,  H04B10/6166 ,  H04B10/6971 ,  H04L25/03057

摘要： Methods, systems, and devices are described for a low complexity interpolator for use in optical transmission systems. An input receives a digitized version of an optical signal, and provides samples of the received signal to a filter module. The filter module filters the input samples according to a set of filter coefficients provided by a memory. The set of filter coefficients are provided based on the output of a numerically controlled oscillator that provides an output corresponding to an accumulation of partial periods of the first sample rate. Filtered data samples are output to a sample block assembler that receives the data samples, removes filtered data samples where it is indicated that the sample is not valid, and outputs valid filtered data samples at the second sample rate and at a fixed number of samples power output period.

摘要翻译： 对于用于光传输系统的低复杂度内插器描述了方法，系统和设备。 输入接收光信号的数字化版本，并将接收信号的样本提供给滤波器模块。 滤波器模块根据存储器提供的一组滤波器系数对输入样本进行滤波。 基于数字控制振荡器的输出提供滤波器系数的集合，其提供与第一采样率的部分周期的累积相对应的输出。 过滤的数据样本被输出到接收数据样本的样本块汇编器，去除其中指示样本无效的滤波数据样本，并以第二采样率和固定数量的采样功率输出有效的滤波数据样本 输出期。

公开(公告)号：US20130336654A1

公开(公告)日：2013-12-19

申请号：US14002266

申请日：2012-02-28

申请人： Manabu Arikawa ,  Daisaku Ogasahara ,  Emmanuel Le Taillandier De Gabory ,  Kiyoshi Fukuchi

发明人： Manabu Arikawa ,  Daisaku Ogasahara ,  Emmanuel Le Taillandier De Gabory ,  Kiyoshi Fukuchi

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  H04B10/614 ,  H04B10/6166

摘要： In order to appropriately demultiplex the polarization multiplexed BPSK signal without using a training sequence and decreasing the resistance to a frequency offset, an optical receiver includes a coherent optical detection unit receiving an optical signal in which BPSK modulated carrier waves are polarization-multiplexed, performing coherent detection by mixing the received optical signal with local light, and outputting first electrical signals corresponding to the carrier waves; a butterfly FIR filter receiving the first electrical signals and extracting second electrical signals corresponding to each of the carrier waves from the first electrical signals; and a coefficient control unit for calculating a sum of respective phases of the second electrical signals output from the butterfly FIR filter, adaptively controlling tap coefficients of the butterfly FIR filter so that the calculated phase sum may become equal to 0 or π, and outputting tap coefficients after being controlled to the butterfly FIR filter.

摘要翻译： 为了适当地解复用偏振复用的BPSK信号而不使用训练序列并降低对频偏的电阻，光接收机包括相干光检测单元，其接收光信号，其中BPSK调制载波被偏振复用，执行相干 通过将接收的光信号与本地光混合来检测，并输出与载波对应的第一电信号; 蝶形FIR滤波器，接收第一电信号并从第一电信号中提取对应于每个载波的第二电信号; 以及系数控制单元，用于计算从蝶形FIR滤波器输出的第二电信号的各相的和，自适应地控制蝶形FIR滤波器的抽头系数，使得计算出的相位和可以变为等于0或pi，并输出抽头 系数被控制到蝴蝶FIR滤波器。

公开(公告)号：US20130251369A1

公开(公告)日：2013-09-26

申请号：US13990603

申请日：2012-02-16

申请人： Daisaku Ogasahara

发明人： Daisaku Ogasahara

IPC分类号： H04J14/06

CPC分类号： H04B10/6162 ,  H04B10/614 ,  H04B10/6164 ,  H04B10/6165 ,  H04B10/6166 ,  H04J14/06

摘要： In order to reduce influence of noise due to a phase deviation, and to estimate an amount of phase compensation with superior accuracy in a polarization multiplexing/demultiplexing optical communication system, a signal processing circuit includes: optical frequency deviation estimating unit for estimating a frequency deviation which is a difference between a frequency of local light and a frequency of the optical carrier wave which is included in a signal data which corresponds to the polarizations and are generated by mixing a plurality of the optical carrier waves with the local light, which optical carrier wave is phase-modulated and have polarizations able to be demultiplexed and for outputting the estimated frequency deviation as an estimated value; for outputting the estimated frequency deviation as an estimated value; optical frequency deviation compensation amount analyzing unit for calculating an amount of frequency compensation which is an amount of compensation to make a phase of the signal data rotated so as to reduce the frequency deviation, on the basis of a plurality of the estimated values estimated per the signal data; optical frequency deviation compensating unit for making the phase of the signal data rotated correspondingly to the amount of the frequency compensation; optical phase deviation estimating unit for estimating a phase deviation included in each of input signal data and is a difference between a phase of the optical carrier wave and a phase of the local light; and optical phase deviation compensating unit for making the phase of the signal data rotated correspondingly to the phase deviation.

摘要翻译： 为了减少由于相位偏差引起的噪声的影响，并且为了在极化复用/解复用光通信系统中以高精度估计相位补偿量，信号处理电路包括：用于估计频偏的光频偏差估计单元 其是局部光的频率和包括在与偏振相对应并且通过将多个光载波与本地光混合而产生的信号数据中的光载波的频率之间的差异，该光载波 波被相位调制，并且具有能够解复用的偏振和用于将估计的频率偏差输出作为估计值; 用于输出所估计的频率偏差作为估计值; 光频偏移补偿量分析单元，用于计算作为使信号数据的相位旋转以减少频率偏差的补偿量的频率补偿量，所述补偿量基于每个所估计的多个估计值 信号数据; 光频偏移补偿单元，用于使信号数据相位相应于频率补偿量; 光学相位偏差估计单元，用于估计每个输入信号数据中包括的相位偏差，并且是光载波的相位和局部光的相位之间的差; 以及用于使信号数据的相位相应于相位偏差旋转的光学相位偏移补偿单元。

公开(公告)号：US20120230676A1

公开(公告)日：2012-09-13

申请号：US13413873

申请日：2012-03-07

申请人： Fan Mo ,  Sameep Dave ,  Christian Rasmussen ,  Mehmet Aydinlik ,  Graeme Pendock

发明人： Fan Mo ,  Sameep Dave ,  Christian Rasmussen ,  Mehmet Aydinlik ,  Graeme Pendock

IPC分类号： H04J14/06 ,  H04B10/08

CPC分类号： H04J14/06 ,  H04B10/614 ,  H04B10/6166

摘要： In an optical transmission system which utilizes polarization multiplexing, a receiver includes an adaptive equalizer which is adjusted at turn-up such that two polarization modes at the equalizer output are time aligned. The adaptive equalizer may be reset in a directed manner in response to an indication that one polarization mode is present at both the first and second outputs. Further, the dominant filters taps of the adaptive equalizer are maintained near a middle of a tap index range. The receiver may also include an interpolation function upstream of the adaptive equalizer and a symbol timing error estimation function that feeds a control signal back to the interpolation function, wherein the interpolation function causes the adaptive equalizer function and symbol timing error estimation function to receive an integer number of samples per symbol.

摘要翻译： 在利用偏振复用的光传输系统中，接收机包括一个自适应均衡器，该自适应均衡器在上电时被调整，使得均衡器输出处的两个偏振模式被时间对准。 响应于在第一和第二输出处存在一个偏振模式的指示，自适应均衡器可以以有向的方式被复位。 此外，自适应均衡器的主要滤波器抽头保持在分接索引范围的中间附近。 接收机还可以包括自适应均衡器上游的内插函数和将控制信号反馈给内插函数的符号定时误差估计函数，其中插值函数使得自适应均衡器函数和符号定时误差估计函数接收整数 每个符号的样本数。

公开(公告)号：US20120045208A1

公开(公告)日：2012-02-23

申请号：US13138958

申请日：2010-04-21

申请人： Wakako Yasuda ,  Daisaku Ogasahara ,  Kiyoshi Fukuchi

发明人： Wakako Yasuda ,  Daisaku Ogasahara ,  Kiyoshi Fukuchi

IPC分类号： H04J14/06

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/6166 ,  H04L27/223

摘要： A coherent receiver 1 assigns a first transmission signal to first transmission polarization, assigns a second transmission signal to second transmission polarization, and receives a quadrature multiplexed signal formed by applying quadrature multiplexing to the first transmission polarization and the second transmission polarization. The coherent receiver includes a detection means 10 for detecting the first transmission polarization and the second transmission polarization according to prescribed first reception polarization and second reception polarization and obtaining a first detected signal and a second detected signal; a quantization means 20 for quantizing the first detected signal and the second detected signal and obtaining a first quantized signal and a second quantized signal; and a signal processing means 30 for, when filtering the first quantized signal and the second quantized signal using a prescribed filtering control algorithm to form a first demodulated signal and a second demodulated signal respectively, adjusting filter coefficients of the filtering control algorithm according to the first quantized signal and the second quantized signal and the first demodulated signal and the second demodulated signal, and outputting the first demodulated signal and the second demodulated signal to a first output terminal and a second output terminal, respectively.

摘要翻译： 相干接收机1将第一传输信号分配给第一传输极化，将第二传输信号分配给第二传输极化，并且接收通过对第一透射偏振和第二透射偏振应用正交多路复用形成的正交多路复用信号。 相干接收机包括：检测装置10，用于根据规定的第一接收极化和第二接收极化检测第一透射偏振和第二透射偏振，并获得第一检测信号和第二检测信号; 量化装置20，用于量化第一检测信号和第二检测信号，并获得第一量化信号和第二量化信号; 以及信号处理装置30，用于当使用规定的滤波控制算法对第一量化信号和第二量化信号进行滤波以分别形成第一解调信号和第二解调信号时，根据第一信号调整滤波器控制算法的滤波器系数 量化信号和第二量化信号以及第一解调信号和第二解调信号，并将第一解调信号和第二解调信号分别输出到第一输出端和第二输出端。

公开(公告)号：US20120039606A1

公开(公告)日：2012-02-16

申请号：US12854668

申请日：2010-08-11

申请人： Vladimir S. GRIGORYAN ,  Vladimir PELEKHATY ,  Michael Y. FRANKEL

发明人： Vladimir S. GRIGORYAN ,  Vladimir PELEKHATY ,  Michael Y. FRANKEL

IPC分类号： H04J14/06 ,  H04B10/04 ,  H04B10/06

CPC分类号： H04J14/06 ,  H04B10/5053 ,  H04B10/548 ,  H04B10/611 ,  H04B10/613 ,  H04B10/614 ,  H04B10/6166

摘要： A method and apparatus for simultaneous processing of signals impressed on a horizontal polarization of a light wave and on a vertical polarization of the light wave is provided. In one embodiment, a horizontal polarization pilot tone is impressed on a data signal carried by the horizontal polarization and a vertical polarization pilot tone is impressed on a data signal carried by the vertical polarization. A receiver processes the dual-polarized light wave and converts it to an X channel signal and a Y channel signal. The X and Y channel signals are processed in separate channels to recover a phase and frequency offset between them and a local oscillator. The phase and frequency recovered and frequency de-multiplexed signals are further processed to polarization de-multiplex the data signal carried by the horizontal polarization and the data signal carried by the vertical polarization.

摘要翻译： 提供了一种用于同时处理施加在光波的水平极化和光波的垂直偏振上的信号的方法和装置。 在一个实施例中，将水平极化导频音施加在由水平极化所携带的数据信号上，垂直极化导频音施加在由垂直极化承载的数据信号上。 接收机处理双偏振光波并将其转换为X通道信号和Y通道信号。 X和Y通道信号在单独的通道中进行处理，以恢复它们与本地振荡器之间的相位和频率偏移。 进一步处理相位和频率恢复和频率解复用信号，以极化解复用由水平偏振承载的数据信号和由垂直极化承载的数据信号。

公开(公告)号：US20080152361A1

公开(公告)日：2008-06-26

申请号：US11644536

申请日：2006-12-22

申请人： Young-Kai Chen ,  Noriaki Kaneda ,  Ut-Va Koc ,  Andreas Bertold Leven

发明人： Young-Kai Chen ,  Noriaki Kaneda ,  Ut-Va Koc ,  Andreas Bertold Leven

IPC分类号： H04B10/06

CPC分类号： H04B10/611 ,  H04B10/61 ,  H04B10/6161 ,  H04B10/6164 ,  H04B10/6165 ,  H04B10/6166

摘要： A method for determining symbols PSK modulated on an optical carrier includes interfering a first polarization component of the modulated optical carrier and a reference optical carrier in a first optical mixer and interfering the first polarization component of the modulated optical carrier and the reference with a different relative phase in a second optical mixer. The method also includes sampling the interfered carriers from the first optical mixer to produce first digital sampled values and sampling the interfered carriers from the second optical mixer to produce second digital sampled values. The first and second digital sampled values of a sampling period form a first complex sampling value thereof. The method also includes offsetting a phase of a complex signal value corresponding to each first complex sampling value to correct for a phase error caused by a frequency offset between the modulated and reference optical carriers.

摘要翻译： 一种用于确定在光载波上调制的符号PSK的方法包括：在第一光混合器中干扰调制光载波的第一偏振分量和参考光载波，并将调制的光载波的第一偏振分量与参考用不同的相对 在第二光学混合器中。 该方法还包括对来自第一光混合器的受干扰载波进行采样，以产生第一数字采样值，并对来自第二光混合器的干扰载波进行采样以产生第二数字采样值。 采样周期的第一和第二数字采样值形成其第一复数采样值。 该方法还包括抵消对应于每个第一复数采样值的复信号值的相位，以校正由调制参考光载波之间的频率偏移引起的相位误差。