公开(公告)号：US20110255877A1

公开(公告)日：2011-10-20

申请号：US13083723

申请日：2011-04-11

申请人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Kosuke KOMAKI

发明人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Kosuke KOMAKI

IPC分类号： H04B10/06

CPC分类号： H04B10/611 ,  H04B10/6164 ,  H04L27/223

摘要： A digital coherent receiver includes a front end, an A/D convertor, and a processor. The front end converts a light signal into an electric signal by using a signal light and a local oscillator light. The A/D convertor converts the electric signal of the front end into a digital signal. The processor calculates a spectrum gravity center of the digital signal converted by the A/D convertor, estimates a frequency offset of the digital signal based on the calculated spectrum gravity center, and reduces the frequency offset of the digital signal based on the estimated frequency offset.

摘要翻译： 数字相干接收机包括前端，A / D转换器和处理器。 前端通过使用信号灯和本地振荡器光将光信号转换为电信号。 A / D转换器将前端的电信号转换为数字信号。 处理器计算由A / D转换器转换的数字信号的频谱重心，基于所计算的频谱重心估计数字信号的频率偏移，并且基于估计的频率偏移来减少数字信号的频率偏移 。

公开(公告)号：US20120195602A1

公开(公告)日：2012-08-02

申请号：US13345008

申请日：2012-01-06

申请人： Hisao NAKASHIMA ,  Takeshi HOSHIDA

发明人： Hisao NAKASHIMA ,  Takeshi HOSHIDA

IPC分类号： H04L7/02 ,  H04B10/06

CPC分类号： H04L7/027 ,  H04B10/616 ,  H04B10/6164 ,  H04B10/63 ,  H04L7/0337

摘要： In a sampling clock synchronizing apparatus, an A/D converter converts an analog signal to a digital signal based on a sampling clock, and a processor compensates a band limitation due to spectral narrowing by filter characteristics of characteristics opposite to those of the spectral narrowing with respect to a signal produced from the A/D converter subjected to the spectral narrowing, and detects a phase shift in the sampling clock based on a signal after the compensation of the spectral narrowing and synchronizes sampling timing.

摘要翻译： 在采样时钟同步装置中，A / D转换器基于采样时钟将模拟信号转换为数字信号，并且处理器通过与频谱变窄的特性相反的特性的滤波特性来补偿由于频谱变窄引起的频带限制， 相对于经受频谱变窄的A / D转换器产生的信号，并且基于在频谱变窄的补偿之后的信号来检测采样时钟中的相移并同步采样定时。

公开(公告)号：US20120106962A1

公开(公告)日：2012-05-03

申请号：US13348245

申请日：2012-01-11

申请人： Takahito TANIMURA ,  Takeshi HOSHIDA ,  Hisao NAKASHIMA ,  Shoichiro ODA

发明人： Takahito TANIMURA ,  Takeshi HOSHIDA ,  Hisao NAKASHIMA ,  Shoichiro ODA

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  H04B10/505 ,  H04B10/532 ,  H04B10/541 ,  H04B10/548 ,  H04B10/5561 ,  H04J14/08 ,  H04L5/04

摘要： A polarization multiplexing and transmitting apparatus generates polarization multiplexed light by multiplexing modulated signal components that having varying intensities and are in polarization states orthogonal to each other. The polarization multiplexing and transmitting apparatus includes a converting unit that converts light generated by a light source into signal components having a varying intensity synchronized with a clock signal input thereto and a varying intensity inversely synchronized with the clock signal, respectively; a modulating unit that modulates the signal components, respectively; and a polarization adjusting unit that orthogonalizes polarization states of the signal components.

摘要翻译： 偏振复用和发送装置通过对具有变化的强度并且处于彼此正交的偏振状态的调制信号分量进行多路复用来产生偏振复用光。 偏振复用和发送装置包括转换单元，其将由光源产生的光变换成具有与输入的时钟信号同步的变化强度的信号分量和与时钟信号反向同步的变化强度; 调制单元，分别调制信号分量; 以及使信号分量的偏振态正交化的偏振调整单元。

公开(公告)号：US20120141131A1

公开(公告)日：2012-06-07

申请号：US13397268

申请日：2012-02-15

申请人： Takahito TANIMURA ,  Takeshi HOSHIDA ,  Hisao NAKASHIMA ,  Shoichiro ODA

发明人： Takahito TANIMURA ,  Takeshi HOSHIDA ,  Hisao NAKASHIMA ,  Shoichiro ODA

IPC分类号： H04B10/06

CPC分类号： H04B10/677 ,  H04B10/60 ,  H04B10/69

摘要： An optical receiving apparatus compensates degradation of an optical signal received, based a division operation using the intensity of the optical signal. A receiving unit outputs a first electrical signal corresponding to the phase of the optical signal and a second electrical signal corresponding to the intensity of the optical signal. An analog first dividing unit and a second dividing unit divide the first electrical signal by the second electrical signal. A first ADC and a second ADC convert the divided electrical signal to a digital signal. An identifying unit identifies data of the optical signal based on calculation using the digital signal.

摘要翻译： 光接收装置基于使用光信号的强度的分割操作来补偿所接收的光信号的劣化。 接收单元输出对应于光信号的相位的第一电信号和对应于光信号的强度的第二电信号。 模拟第一分割单元和第二分割单元将第一电信号除以第二电信号。 第一ADC和第二ADC将分频电信号转换为数字信号。 识别单元基于使用数字信号的计算来识别光信号的数据。

公开(公告)号：US20090317092A1

公开(公告)日：2009-12-24

申请号：US12408176

申请日：2009-03-20

申请人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Takahito TANIMURA ,  Lei LI ,  Ling LIU

发明人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Takahito TANIMURA ,  Lei LI ,  Ling LIU

IPC分类号： H04B10/06

CPC分类号： H04B10/6165 ,  H04B10/61 ,  H04B10/611 ,  H04L7/0054 ,  H04L27/223

摘要： An optical receiving apparatus includes a combining unit that combines signal light and reference light; a optoelectric converting unit that converts, into electrical signals, two or more optical signals that enable reconstruction of a complex electric field signal of the signal light obtained by the combining unit; and a sampling clock generating unit that generates a sampling clock that has a frequency preset based on a symbol rate of the signal light and is asynchronous with the signal light. The optical receiving apparatus further includes a digital converting unit that samples at the frequency of the sampling clock signal, an electrical signal obtained by the optoelectric converting unit and converts the electrical signal into a digital signal; and a digital signal processing unit that demodulates a received signal based on a complex digital signal obtained from the digital signal obtained by the digital converting unit.

摘要翻译： 光接收装置包括组合信号光和参考光的组合单元; 光电转换单元，其将电信号转换成能够重构由组合单元获得的信号光的复电场信号的两个或更多个光信号; 以及采样时钟产生单元，其生成具有基于信号光的符号率预设的频率并且与信号光异步的采样时钟。 光接收装置还包括数字转换单元，以采样时钟信号的频率采样，由光电转换单元获得的电信号，并将该电信号转换为数字信号; 以及数字信号处理单元，其基于从由数字转换单元获得的数字信号获得的复数数字信号来解调接收信号。

公开(公告)号：US20080272943A1

公开(公告)日：2008-11-06

申请号：US11967394

申请日：2007-12-31

申请人： Takahito TANIMURA ,  Hisao NAKASHIMA ,  Takeshi HOSHIDA

发明人： Takahito TANIMURA ,  Hisao NAKASHIMA ,  Takeshi HOSHIDA

IPC分类号： H03M1/20 ,  H03M1/66

CPC分类号： H04L7/007 ,  H03M1/1255 ,  H04B10/697

摘要： An optical receiving device of the present invention receives optical signals from an optical transmitting device which uses a modulation format wherein an optical intensity waveform of each symbol is return-to-zero (RZ) pulse, and converts the received optical signals into digital signals by a conversion process of an analog to digital (AD) converter. A control-value calculating unit subsequent to the AD converter digitally processes the digital signals, retrieves an absolute value of the digital signals or a value corresponding one-to-one with the absolute value of the digital signals, estimates errors from an appropriate timing of a sampling timing in the AD converter based on the absolute value of the digital signals or the value corresponding one-to-one with the absolute value of the digital signals, and calculates a control value controlling the sampling timing based on the estimated errors. Based on the control value, a phase of a pulse regulating the sampling timing of AD conversion can be compensated.

摘要翻译： 本发明的光接收装置接收来自光发送装置的光信号，该光发送装置采用调制格式，其中每个符号的光强度波形为归零（RZ）脉冲，并将接收到的光信号转换成数字信号 模数转换器（AD）转换器的转换过程。 AD转换器之后的控制值计算单元对数字信号进行数字处理，用数字信号的绝对值检索数字信号的绝对值或与之对应的值，从适当的定时估计误差 基于数字信号的绝对值的AD转换器中的采样定时或与数字信号的绝对值一一对应的值，并且基于估计的误差来计算控制采样定时的控制值。 基于控制值，可以补偿调节AD转换的采样定时的脉冲的相位。

公开(公告)号：US20110170881A1

公开(公告)日：2011-07-14

申请号：US12977979

申请日：2010-12-23

申请人： Hisao NAKASHIMA ,  Takeshi Hoshida

发明人： Hisao NAKASHIMA ,  Takeshi Hoshida

IPC分类号： H04B10/06

CPC分类号： H04B10/6165 ,  H04B10/6161 ,  H04B10/6162 ,  H04B10/6164 ,  H04B10/697 ,  H04L7/0335

摘要： A light receiving device includes: a converter digitalizing an analog signal with a given sampling clock frequency, the analog signal being obtained through a photoelectric conversion of a received optical signal; a plurality of fixed distortion compensators compensating an output signal of the converter for waveform distortion with a fixed compensation amount that is different from each other; a plurality of phase shift detector circuits detecting a sampling phase shift from an output signal of the plurality of the fixed distortion compensators; a phase-adjusting-amount determiner determining a sampling phase adjusting amount with use of an output signal of the plurality of the phase shift detector circuits; and a phase adjusting circuit reducing a phase difference between the sampling clock frequency and the received optical signal based on a determination result of the phase-adjusting-amount determiner.

摘要翻译： 光接收装置包括：转换器，其以给定的采样时钟频率对模拟信号进行数字化，模拟信号通过光接收光信号获得; 多个固定失真补偿器，其以相互不同的固定补偿量补偿所述转换器的输出信号的波形失真; 多个相移检测器电路，从多个固定失真补偿器的输出信号中检测采样相移; 相位调整量确定器，利用多个相移检测器电路的输出信号确定采样相位调整量; 以及相位调整电路，根据相位调整量判定器的判定结果，减小采样时钟频率与接收到的光信号之间的相位差。

公开(公告)号：US20100303474A1

公开(公告)日：2010-12-02

申请号：US12776514

申请日：2010-05-10

申请人： Hisao NAKASHIMA ,  Takeshi Hoshida

发明人： Hisao NAKASHIMA ,  Takeshi Hoshida

IPC分类号： H04B10/06

CPC分类号： H04B10/697 ,  H04B10/61 ,  H04B10/611 ,  H04B10/613 ,  H04B10/6165

摘要： A digital coherent optical receiver provided with a 90-degree optical hybrid circuit for detecting an in-phase signal and a quadrature signal of an input optical signal, includes first through fourth circuits. The first circuit calculates a square of a sum of the in-phase signal and the quadrature signal. The second circuit subtracts a squared value of the in-phase signal and a squared value of the quadrature signal from the calculation result of the first circuit. The third circuit detects a phase error of the 90-degree optical hybrid circuit based on the calculation result of the second circuit. The fourth circuit corrects at least one of the in-phase signal and the quadrature signal according to the phase error detected by the third circuit.

摘要翻译： 具有用于检测输入光信号的同相信号和正交信号的90度光混合电路的数字相干光接收机包括第一至第四电路。 第一电路计算同相信号和正交信号之和的平方。 第二电路从第一电路的计算结果中减去同相信号的平方值和正交信号的平方值。 第三电路基于第二电路的计算结果来检测90度光混合电路的相位误差。 第四电路根据由第三电路检测到的相位误差校正至少一个同相信号和正交信号。

公开(公告)号：US20100189445A1

公开(公告)日：2010-07-29

申请号：US12619656

申请日：2009-11-16

申请人： Hisao NAKASHIMA ,  Takeshi HOSHIDA

发明人： Hisao NAKASHIMA ,  Takeshi HOSHIDA

IPC分类号： H04B10/00

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/614 ,  H04B10/6161 ,  H04B10/6165

摘要： An optical receiver for receiving an optical signal that transmits a first data signal and a second data signal, including: an optical front-end configured to generate a digital signal that represents the optical signal; a detector configured to detect a state of the optical signal by using the digital signal and output state information that represents the state of the optical signal; a state controller configured to control the digital signal on the basis of the state information in order to recover the first data signal; and a data recovery configured to recover the second data signal on the basis of the state information.

摘要翻译： 一种用于接收发送第一数据信号和第二数据信号的光信号的光接收器，包括：光学前端，被配置为产生表示光信号的数字信号; 检测器，被配置为通过使用数字信号来检测光信号的状态，并输出表示光信号的状态的状态信息; 状态控制器，被配置为基于所述状态信息来控制所述数字信号，以便恢复所述第一数据信号; 以及数据恢复，被配置为基于所述状态信息来恢复所述第二数据信号。

公开(公告)号：US20080267638A1

公开(公告)日：2008-10-30

申请号：US12104056

申请日：2008-04-16

申请人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Takahito TANIMURA

发明人： Hisao NAKASHIMA ,  Takeshi HOSHIDA ,  Takahito TANIMURA

IPC分类号： H04B10/06

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/6165

摘要： An optical mixing part mixing a received optical signal and local oscillator light in at least two kinds of phases and extracting at least two-system optical signals corresponding to each light phase; a photoelectric conversion part converting the at least two-system optical signals obtained in the optical mixing part into electric analog signals; an analog-to-digital conversion part converting the electric analog signals into digital signals; and a control part processing the digital signals thereby detecting a light phase difference between the respective systems in the optical mixing part and supplying a signal for correcting the light phase between the systems to the optical mixing part to control the optical mixing part so that the light phase difference becomes to zero or close to a desired value when the light phase difference has a shift from the desired value.

摘要翻译： 一种光混合部分，将接收的光信号和至少两相的本地振荡光混合，并提取与每个光相对应的至少两系统的光信号; 将所述光混合部中获得的所述至少两系统的光信号转换成电模拟信号的光电转换部; 模拟数字转换部分将电模拟信号转换为数字信号; 以及控制部分处理数字信号，从而检测光混合部分中的各个系统之间的光相位差，并将用于校正系统之间的光相位的信号提供给光学混合部分，以控制光学混合部分，使得光 当光相位差从期望值偏移时，相位差变为零或接近期望值。