公开(公告)号：US08331805B2

公开(公告)日：2012-12-11

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：US20120290244A1

公开(公告)日：2012-11-15

申请号：US13412176

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： G01D18/00 ,  G06F19/00

CPC分类号： H04B10/255 ,  H04B10/6971

摘要： A method and apparatus for compensating nonlinear damage are disclosed. The method for compensating nonlinear damage, including: determining an additive parameter indicating an amount of nonlinear damage based on a plurality of sampled signal sets among which a sampling time of an input signal varies according to different time; and subtracting the additive parameter from the input signal.

摘要翻译： 公开了一种用于补偿非线性损伤的方法和装置。 一种用于补偿非线性损伤的方法，包括：基于多个采样信号集确定表示非线性损伤量的附加参数，其中输入信号的采样时间根据不同的时间而变化; 并从输入信号中减去加法参数。

公开(公告)号：US08244138B2

公开(公告)日：2012-08-14

申请号：US12071984

申请日：2008-02-28

申请人： Takeshi Hoshida ,  Jens Rasmussen

发明人： Takeshi Hoshida ,  Jens Rasmussen

IPC分类号： H04B10/00

CPC分类号： H04J14/06 ,  H04B10/532

摘要： By using low-frequency signals, an optical transmitting unit modulates one of a wavelength, a transmission timing, and an intensity of light as a carrier wave. A polarization multiplexer synthesizes the output light signals, modulated by the optical transmitting unit, in polarization states orthogonal to each other and generates polarization-multiplexing signals. A polarization splitter splits by extracting two orthogonal polarization components from the polarization-multiplexing signals. The polarization states of the polarization-multiplexing signals are controlled by a polarization controller in an optical receiving unit. A band-pass filter extracts components transmitting through passbands from output signals of the optical receiving unit and outputs an intensity of the components. Based on the intensity output from the filter, a controlling circuit generates feedback control signals for maximizing a ratio of the components of the low-frequency signals and by using the feedback control signals, the polarization controller controls the polarization states of the optical multiplexing signals.

摘要翻译： 通过使用低频信号，光发送单元调制作为载波的波长，发送定时和光强度中的一个。 偏振复用器以由彼此正交的极化状态合成由光发射单元调制的输出光信号，并产生偏振复用信号。 偏振分离器通过从偏振复用信号中提取两个正交偏振分量来分离。 偏振复用信号的偏振状态由光接收单元中的偏振控制器控制。 带通滤波器提取从光接收单元的输出信号通过通带传输的分量，并输出分量的强度。 基于来自滤波器的强度输出，控制电路产生用于使低频信号的分量的比率最大化的反馈控制信号，并且通过使用反馈控制信号，偏振控制器控制光复用信号的偏振状态。

公开(公告)号：US08116635B2

公开(公告)日：2012-02-14

申请号：US12155262

申请日：2008-05-30

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： H04B10/08

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：US20110188851A1

公开(公告)日：2011-08-04

申请号：US13013805

申请日：2011-01-25

申请人： Shoichiro ODA ,  Takeshi Hoshida

发明人： Shoichiro ODA ,  Takeshi Hoshida

IPC分类号： H04B10/08

CPC分类号： H04L1/0036 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0221 ,  H04L1/0053

摘要： An attenuation amount corresponding to each wavelength at OADM node is optimized according to a calculation result in a network management system (NMS), so that an optical signal level diagram according to traffic volume variations is set, the level diagram allows each of optical signal quality indexes at terminal nodes for all wavelengths to be maintained at a required threshold value or more, and allows an optical signal quality index of a specific wavelength to be improved. Then, an FEC circuit in an optical receiver corresponding to the specific wavelength is turned OFF or the error correction ability is lowered, whereby power consumption of an overall optical network is efficiently reduced.

摘要翻译： 根据网络管理系统（NMS）中的计算结果优化对应于OADM节点处的每个波长的衰减量，从而设置根据业务量变化的光信号电平图，电平图允许每个光信号质量 在所有波长的终端节点处的索引将被维持在所需的阈值以上，并且允许提高特定波长的光信号质量指数。 然后，对应于特定波长的光接收机中的FEC电路被关断或者纠错能力降低，从而有效地降低了整个光网络的功耗。

公开(公告)号：US07907324B2

公开(公告)日：2011-03-15

申请号：US12292471

申请日：2008-11-19

申请人： Takeshi Hoshida ,  Yuichi Akiyama

发明人： Takeshi Hoshida ,  Yuichi Akiyama

IPC分类号： G02F1/01 ,  G02B26/00

CPC分类号： G02F1/0123 ,  G02F1/2255 ,  H04B10/5053 ,  H04B10/50575 ,  H04B10/541

摘要： The optical modulator branches an input light into (2×N) lights in an optical branching section, and then phase modulates each of the branched lights in (2×N) phase modulating sections, and couples the phase modulated lights in an optical coupling section and generates a quadrature amplitude modulated (QAM) signal light having a 4N value. At this time, a relative difference of optical phases of the phase modulated lights is variably adjusted by an optical phase adjusting section. Moreover, a power ratio of the phase modulated lights is variably adjusted with an optical power adjusting section. As a result, it is possible to output 4N QAM signal light, with good signal quality.

摘要翻译： 光调制器将输入光分支到（2×N）个光分支部分中，然后对（2×N）个相位调制部分中的每个分支光进行相位调制，并将相位调制光耦合到光耦合部分 并产生具有4N值的正交幅度调制（QAM）信号光。 此时，通过光学相位调整部可变地调整相位调制光的相位差。 此外，利用光功率调节部可变地调节相位调制光的功率比。 因此，可以输出4N QAM信号光，信号质量好。

公开(公告)号：US20100329697A1

公开(公告)日：2010-12-30

申请号：US12821061

申请日：2010-06-22

申请人： Nobukazu KOIZUMI ,  Takeshi Hoshida ,  Takahito Tanimura ,  Hisao Nakashima ,  Koji Nakamuta ,  Noriyasu Nakayama

发明人： Nobukazu KOIZUMI ,  Takeshi Hoshida ,  Takahito Tanimura ,  Hisao Nakashima ,  Koji Nakamuta ,  Noriyasu Nakayama

IPC分类号： H04B10/06

CPC分类号： H04B10/616 ,  H03J7/26 ,  H04B10/60 ,  H04B10/611 ,  H04B10/614 ,  H04B10/6165 ,  H04L7/0335 ,  H04L27/0014 ,  H04L27/223 ,  H04L27/2276 ,  H04L2027/0016 ,  H04L2027/0067

摘要： A digital coherent receiving apparatus includes a first oscillator for outputting a local light signal of a fixed frequency, a hybrid unit mixing the local light signal with a light signal received by a receiver, a second oscillator for outputting a sampling signal of a sampling frequency, a converter for converting the mixed light signal into digital signal synchronizing with the sampling signal, a waveform adjuster for adjusting a waveform distortion of the converted digital signal, a phase adjustor for adjusting a phase of the digital signal adjusted by the waveform adjustor, a demodulator for demodulating the digital signal adjusted by the phase adjuster, and a phase detector for detecting a phase of the digital signal adjusted by the phase adjuster, and a control signal output unit for outputting a frequency control signal on the basis of the detected phase signal to the second oscillator.

摘要翻译： 数字相干接收装置包括用于输出固定频率的本地光信号的第一振荡器，将本地光信号与由接收机接收的光信号混合的混合单元，用于输出采样频率的采样信号的第二振荡器， 用于将混合光信号转换为与采样信号同步的数字信号的转换器，用于调整转换的数字信号的波形失真的波形调节器，用于调整由波形调节器调节的数字信号的相位的相位调节器，解调器 用于解调由相位调节器调节的数字信号，以及相位检测器，用于检测由相位调节器调节的数字信号的相位;以及控制信号输出单元，用于根据检测到的相位信号将频率控制信号输出到 第二个振荡器。

公开(公告)号：US07860394B2

公开(公告)日：2010-12-28

申请号：US12382621

申请日：2009-03-19

申请人： Takeshi Hoshida

发明人： Takeshi Hoshida

IPC分类号： H04B10/04 ,  H04B10/12

CPC分类号： H04B10/61 ,  H04B10/532

摘要： In an optical receiver according to the present invention, an input signal light subjected to the differential quadrature phase shift keying (DQPSK) is incident on a PANDA type fiber in a linearly polarized state by 45°, so that a delay time difference corresponding to one symbol is generated between orthogonal polarization components in the DQPSK signal light, and then, the signal light is branched by a half mirror into two, to be sent to first and second paths respectively, thereby giving, by a ¼ wave plate disposed on one of the paths, a relative birefringent amount difference of π/2 between the lights propagated through the respective paths. Then, each of the lights propagated through the first and second paths is separated into two orthogonal polarization components by a polarization beam splitter, and the respective polarization components are received by a differential reception circuit so that in-phase components and quadrature components in the DQPSK signal are demodulated. Thus, a small sized and low cost optical receiver capable of stably demodulating the DQPSK signal is provided.

公开(公告)号：US20100196017A1

公开(公告)日：2010-08-05

申请号：US12697202

申请日：2010-01-29

申请人： Takahito TANIMURA ,  Takeshi Hoshida ,  Hisao Nakashima ,  Kazunari Shiota ,  Kiichi Sugitani

发明人： Takahito TANIMURA ,  Takeshi Hoshida ,  Hisao Nakashima ,  Kazunari Shiota ,  Kiichi Sugitani

IPC分类号： H04B10/00 ,  H04B1/10 ,  H04B10/06

CPC分类号： H04B10/6971 ,  H04B10/25133 ,  H04B10/616 ,  H04B10/6161 ,  H04B2210/252

摘要： A distortion compensating apparatus which compensates for distortion in a waveform of a received light signal through a digital signal processing includes a plurality of fixed amount compensators which compensate for the distortion in the waveform at respective given compensating amounts. The combination of operating states of the plurality of fixed amount compensators is changed by on/off switching of each of the plurality of fixed amount compensators, and the plurality of fixed amount compensators are cascaded.

摘要翻译： 通过数字信号处理补偿接收的光信号的波形中的失真的失真补偿装置包括多个固定量补偿器，其补偿各个给定补偿量处的波形失真。 通过多个固定量补偿器中的每一个的开/关切换来改变多个固定量补偿器的操作状态的组合，并且多个固定量补偿器被级联。

公开(公告)号：US20100111544A1

公开(公告)日：2010-05-06

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。