公开(公告)号：US06775424B2

公开(公告)日：2004-08-10

申请号：US10007987

申请日：2001-11-12

申请人： Seemant Choudhary ,  Takeshi Hoshida

发明人： Seemant Choudhary ,  Takeshi Hoshida

IPC分类号： G02F101

CPC分类号： H04B10/505 ,  H04B10/25137 ,  H04B10/5051 ,  H04B10/5053 ,  H04B10/5165

摘要： An optical modulator for generating an optical information signal includes a first modulator that modulates an optical carrier with a clock signal. The optical modulator further includes a filter that suppresses a residual carrier component of modulated optical signals. In addition, the optical modulator includes a second modulator for modulating an optical signal with a non-return to zero data signal. When combined, the first and second modulator and the filter operate to transform an optical carrier signal into an optical information signal that is highly tolerant to dispersion and non-linear effects in optical fibers.

摘要翻译： 一种用于产生光信息信号的光调制器包括用时钟信号调制光载波的第一调制器。 光调制器还包括抑制调制光信号的残留载波分量的滤波器。 此外，光调制器包括用于以不归零数据信号调制光信号的第二调制器。 当组合时，第一和第二调制器和滤波器操作以将光载波信号转换成对光纤中的色散和非线性效应高度耐受的光信息信号。

公开(公告)号：US09219622B2

公开(公告)日：2015-12-22

申请号：US13412096

申请日：2012-03-05

申请人： Weizhen Yan ,  Zhenning Tao ,  Takeshi Hoshida

发明人： Weizhen Yan ,  Zhenning Tao ,  Takeshi Hoshida

IPC分类号： H04B10/18 ,  H04L25/02 ,  H04B10/69

CPC分类号： H04L25/0202 ,  H04B10/6971

摘要： The embodiments relate to a method and an apparatus for compensating nonlinear damage. The method and apparatus being used in a dual-polarization communication system, the method comprising: calculating, according to input time-domain signals, a plurality of multiplicative parameters indicative of nonlinear damages to the input signals; constructing a plurality of multiplicators by using the plurality of multiplicative parameters; and compensating the input time-domain signals by using the plurality of multiplicators.

摘要翻译： 实施例涉及用于补偿非线性损伤的方法和装置。 所述方法和装置用于双极化通信系统中，所述方法包括：根据输入的时域信号，计算指示对所述输入信号的非线性损伤的多个乘法参数; 通过使用所述多个乘法参数构造多个乘法器; 以及通过使用所述多个乘法器来补偿所述输入时域信号。

公开(公告)号：US09014575B2

公开(公告)日：2015-04-21

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： H04B10/06 ,  H04L7/027 ,  H04L7/033

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：US08744278B2

公开(公告)日：2014-06-03

申请号：US12458104

申请日：2009-06-30

申请人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura

发明人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura

IPC分类号： H04B10/06 ,  H04B10/00

CPC分类号： H04L25/03038 ,  H04B10/6971 ,  H04L2025/03566

摘要： In a digital signal processing circuit of an optical receiver applicable to this method for electric power supply control, tap coefficients of a filter used in a waveform equalization section are calculated in a tap coefficient calculating section, based on a state of an optical fiber transmission line. Then, among the calculated tap coefficients, a tap coefficient for which an absolute value is less than a previously determined threshold is determined, and electric power supply to a circuit part of a filter corresponding to the tap coefficient is stopped. As a result, for an optical receiver that performs digital signal processing, it is possible to reduce the power consumption, while realizing waveform equalization at a high accuracy.

摘要翻译： 在适用于该电力供给控制方法的光接收机的数字信号处理电路中，根据光纤传输线的状态，在抽头系数计算部中计算波形均衡部中使用的滤波器的抽头系数 。 然后，在所计算的抽头系数中，确定绝对值小于先前确定的阈值的抽头系数，并且停止对与抽头系数相对应的滤波器的电路部分的电力供应。 结果，对于执行数字信号处理的光接收机，可以在高精度地实现波形均衡的同时降低功耗。

公开(公告)号：US08693891B2

公开(公告)日：2014-04-08

申请号：US13048150

申请日：2011-03-15

申请人： Masato Nishihara ,  Tomoo Takahara ,  Takeshi Hoshida

发明人： Masato Nishihara ,  Tomoo Takahara ,  Takeshi Hoshida

IPC分类号： H04J14/06 ,  H04B10/04 ,  H04B10/00

CPC分类号： H04B10/505 ,  H04B10/5162

摘要： An optical modulation apparatus includes a first modulator, a second modulator, a multiplexer, a calculator and an adjustor. The first modulator configured to modulate light emitted by a light source using a first input signal and output a first modulated signal. The second modulator configured to modulate the light using a second input signal and output a second modulated signal. The multiplexer configured to multiplex the first and second modulated signals and output a multiplexed signal. The calculator configured to calculate a power difference between a higher-side frequency component having a frequency higher than a center frequency of the multiplexed signal and a lower-side frequency component having a frequency lower than the center frequency. The adjustor configured to adjust delays of the first and second input signals based on the power.

摘要翻译： 光调制装置包括第一调制器，第二调制器，多路复用器，计算器和调节器。 第一调制器被配置为使用第一输入信号调制由光源发射的光并输出第一调制信号。 第二调制器被配置为使用第二输入信号调制光并输出第二调制信号。 复用器被配置为复用第一和第二调制信号并输出​​多路复用信号。 所述计算器被配置为计算频率高于所述多路复用信号的中心频率的较高侧频率分量与具有低于所述中心频率的频率的下侧频率分量之间的功率差。 调整器被配置为基于功率来调整第一和第二输入信号的延迟。

公开(公告)号：US08649685B2

公开(公告)日：2014-02-11

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： H04B10/00

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：US08488975B2

公开(公告)日：2013-07-16

申请号：US12911395

申请日：2010-10-25

申请人： Shoichiro Oda ,  Takeshi Hoshida ,  Takahito Tanimura

发明人： Shoichiro Oda ,  Takeshi Hoshida ,  Takahito Tanimura

IPC分类号： H04B10/00

CPC分类号： H04B10/5053 ,  H04B10/2569 ,  H04B10/516 ,  H04B2210/254 ,  H04J14/06 ,  H04J14/086

摘要： An optical transmitter includes: a pre-compensator calculating an electrical field of an optical signal subjected to an electronic pre-compensation with respect to an input digital signal; a parallelizer parallelizing the electrical field of the optical signal calculated by the pre-compensator; a plurality of optical modulators modulating an optical signal based on each of parallelized electrical fields of optical signals; and a time-division multiplexer time-division-multiplexing an optical signal output from the plurality of the optical modulators.

摘要翻译： 光发射机包括：预补偿器，用于计算相对于输入数字信号进行电子预补偿的光信号的电场; 平行化由预补偿器计算的光信号的电场的并联器; 多个光调制器，其基于光信号的并行电场中的每一个调制光信号; 以及时分多路复用器，对从多个光调制器输出的光信号进行时分复用。

公开(公告)号：US08406635B2

公开(公告)日：2013-03-26

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：US08391725B2

公开(公告)日：2013-03-05

申请号：US12496274

申请日：2009-07-01

申请人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura

发明人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Takahito Tanimura

IPC分类号： H04B10/06

CPC分类号： H04B10/613 ,  H04B10/60 ,  H04B10/64

摘要： While altering a plurality of wavelength setting parameters according to a control sequence, a local oscillation light having a wavelength controlled by those wavelength setting parameters is generated. Further, the received signal light and the generated local oscillation light are mixed, and if an electric signal is generated by photoelectric conversion from the resulting light, then the wavelength control of the local oscillation light is terminated.

摘要翻译： 在根据控制序列改变多个波长设置参数的同时，产生具有由这些波长设置参数控制的波长的本地振荡光。 此外，接收的信号光和产生的本地振荡光被混合，并且如果通过从所得到的光的光电转换产生电信号，则终止本地振荡光的波长控制。

公开(公告)号：US08351795B2

公开(公告)日：2013-01-08

申请号：US12219863

申请日：2008-07-29

申请人： Hisao Nakashima ,  Takeshi Hoshida ,  Takahito Tanimura ,  Toru Katagiri ,  Shoichiro Oda

发明人： Hisao Nakashima ,  Takeshi Hoshida ,  Takahito Tanimura ,  Toru Katagiri ,  Shoichiro Oda

IPC分类号： H04B10/00

CPC分类号： H04B10/2572 ,  H04B10/532 ,  H04B10/5561

摘要： An optical transmission system, where in an optical transmitter a detection bit having a specific pattern set according to the number of bits to be transmitted within one symbol time, is imparted with respect to a transmission signal in which transmission information has been encoded according to a preset format, and an optical signal generated by modulating light according to the transmission signal is transmitted to a transmission line. In an optical receiver, logic inversion or bit swap of received data is detected and compensated by using the detection bit included in the received signal, a decoding process of the compensated received signal is executed. As a result, when an optical signal capable of transmitting multi-bit information within one symbol time is transferred, it is possible to realize excellent transmission characteristics, by reliably compensating an error in received data caused by the modulation format or the multiplex system of the optical signal.