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：US20100054759A1

公开(公告)日：2010-03-04

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

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：US07505414B2

公开(公告)日：2009-03-17

申请号：US10992829

申请日：2004-11-22

申请人： Hisao Nakashima ,  Takeshi Hoshida ,  Yuichi Akiyama ,  Takafumi Terahara

发明人： Hisao Nakashima ,  Takeshi Hoshida ,  Yuichi Akiyama ,  Takafumi Terahara

IPC分类号： H04L12/28

CPC分类号： H04L41/145

摘要： Linear networks are divided into a plurality of regeneration repeating sections which have nodes having regeneration repeaters arranged therein at both ends, devices such as linear repeaters or OADMs are arranged at the nodes positioned in the regeneration repeating sections, a plurality of assumed paths assumed as a result of arranging the devices are extracted in the regeneration repeating sections, and transmission permission/inhibition is determined transmission permission/inhibition is displayed to allow a user to perform settings again.

摘要翻译： 线性网络被分成多个再生重复部分，其具有在其两端布置有再生中继器的节点，诸如线性中继器或OADM的设备被布置在位于再生重复部分中的节点处，多个假定路径被假定为 在再生重复部分中抽出装置的结果，对每个假设路径确定发送允许/禁止，然后显示所确定的发送允许/禁止以允许用户再次执行设置。

公开(公告)号：US20080297270A1

公开(公告)日：2008-12-04

申请号：US12216270

申请日：2008-07-02

申请人： Tomoo Takahara ,  Takeshi Hoshida ,  Hisao Nakashima

发明人： Tomoo Takahara ,  Takeshi Hoshida ,  Hisao Nakashima

IPC分类号： H03C3/00

CPC分类号： G02F1/225 ,  G02F2001/212 ,  G02F2201/18 ,  G02F2203/50 ,  H04B10/505 ,  H04B10/5561

摘要： A drive signal generation unit generates first and second drive signals for driving first and second phase modulators of a DQPSK optical modulator. First and second regeneration circuits regenerate the first and second drive signals with respect to clock signals. The first and second phase modulators are driven by the regenerated first and second drive signals. The amplitude of the first drive signal is adjusted by a first attenuator. The clock signal for the second regeneration circuit is applied after attenuated by a second attenuator. The delay time caused by the first attenuator is the same as the delay time caused by the second attenuator.

摘要翻译： 驱动信号生成单元生成用于驱动DQPSK光调制器的第一和第二相位调制器的第一和第二驱动信号。 第一和第二再生电路相对于时钟信号再生第一和第二驱动信号。 第一和第二相位调制器由再生的第一和第二驱动信号驱动。 第一驱动信号的振幅由第一衰减器调节。 第二再生电路的时钟信号由第二衰减器衰减后施加。 由第一衰减器引起的延迟时间与由第二衰减器引起的延迟时间相同。

公开(公告)号：US20080080805A1

公开(公告)日：2008-04-03

申请号：US11882062

申请日：2007-07-30

申请人： Hisao Nakashima ,  Takeshi Hoshida

发明人： Hisao Nakashima ,  Takeshi Hoshida

IPC分类号： G02B6/00

CPC分类号： H04L7/0075 ,  G02B6/278 ,  H04B10/2569

摘要： In a PMD compensator of the present invention, a signal light input to an input terminal is supplied to a polarizer via a polarization controller; a part of polarized light transmitted through the polarizer is branched by an optical coupler as a monitor light; the monitor light is converted into a electrical signal by a photodiode; a clock corresponding to a RZ clock frequency of the signal light is extracted from the electrical signal using a band-pass filter, to thereby monitor the intensity thereof; and the polarization controller is feedback controlled by a PC control section so that the monitored intensity of the clock becomes maximum. As a result, a miniaturized and low-cost PMD compensator which can reliably compensate for first-order polarization mode dispersion of a RZ-pulsed signal light is provided.

摘要翻译： 在本发明的PMD补偿器中，输入到输入端子的信号光通过偏振控制器提供给偏振器; 通过偏振器的偏振光的一部分由作为监视光的光耦合器分支; 监视器光被光电二极管转换成电信号; 使用带通滤波器从电信号中提取对应于信号光的RZ时钟频率的时钟，从而监视其强度; 并且偏振控制器由PC控制部分反馈控制，使得监视的时钟强度变为最大。 因此，提供了可以可靠地补偿RZ脉冲信号光的一阶偏振模色散的小型化和低成本的PMD补偿器。

公开(公告)号：US20060193638A1

公开(公告)日：2006-08-31

申请号：US11316961

申请日：2005-12-27

申请人： Yuichi Akiyama ,  Takafumi Terahara ,  Takeshi Hoshida ,  Hisao Nakashima

发明人： Yuichi Akiyama ,  Takafumi Terahara ,  Takeshi Hoshida ,  Hisao Nakashima

IPC分类号： H04B10/12

CPC分类号： H04B10/2513

摘要： The present invention discloses a design method of wavelength dispersion compensation of a desired link that is extracted from an optical network, the link including two or more spans, and two or more nodes (N1, N4) that are equipped with an add/drop function, as shown in FIG. 2. All residual dispersion ranges of paths that reach corresponding nodes are adjusted to fall within predetermined tolerable residual dispersion ranges that are set up for all the paths of the link by adjusting wavelength dispersion compensators provided to each of the spans.

摘要翻译： 本发明公开了一种从光网络提取的期望链路的波长色散补偿的设计方法，包括两个或多个跨度的链路，以及两个或更多个节点（N 1，N 4），其配备有添加/ drop功能，如图3所示。 通过调整提供给每个跨度的波长色散补偿器，到达对应节点的路径的所有残余色散范围被调整为落在通过链路的所有路径设置的预定的可容忍残余色散范围内。

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：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：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。