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1. 发明授权

US08660438B2 Digital coherent receiver and receiving method 有权
标题翻译：数字相干接收机和接收方式
公开(公告)号：US08660438B2
公开(公告)日：2014-02-25
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。

2. 发明授权

US08447190B2 Distortion compensating apparatus, optical receiving apparatus, and optical transmitting and receiving system 有权
标题翻译：失真补偿装置，光接收装置和光发送和接收系统
公开(公告)号：US08447190B2
公开(公告)日：2013-05-21
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： H04B10/06 , H04B10/08 , H04B10/12 , H04B10/00 , H04J14/02
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。

3. 发明授权

US08249464B2 Optical receiver and method for optical reception 有权
标题翻译：光接收机和光接收方法
公开(公告)号：US08249464B2
公开(公告)日：2012-08-21
申请号：US12719258
申请日：2010-03-08
申请人： Shoichiro Oda , Takeshi Hoshida , Hisao Nakashima , Takahito Tanimura , Yuichi Akiyama
发明人： Shoichiro Oda , Takeshi Hoshida , Hisao Nakashima , Takahito Tanimura , Yuichi Akiyama
IPC分类号： H04B10/00 , H04B10/06 , H04J14/02
CPC分类号： H04B10/614 , H04B10/60 , H04B10/63
摘要： In-phase signal light and quadrature-phase signal light obtained by mixing input light and local light with each other are converted into digital signals. The quality of a signal to be received is monitored with reference to information obtained through digital signal processing, and the power ratio between the input signal light and the local light that are to be mixed with each other are controlled on the basis of the result of the monitoring.
摘要翻译：通过将输入光和局部光彼此混合而获得的同相信号光和正交相位信号光被转换为数字信号。参照通过数字信号处理获得的信息来监视要接收的信号的质量，并且基于将要混合的输入信号光和本地光之间的功率比来控制监控。

4. 发明申请

US20120141130A1 OPTICAL TRANSMITTER AND OPTICAL TRANSMITTER UNIT 有权
标题翻译：光学发射器和光学发射器单元
公开(公告)号：US20120141130A1
公开(公告)日：2012-06-07
申请号：US13267909
申请日：2011-10-07
申请人： Hisao Nakashima , Takeshi Hoshida
发明人： Hisao Nakashima , Takeshi Hoshida
IPC分类号： H04B10/04 , H04J14/02
CPC分类号： H04B10/505 , H04B10/572
摘要： The optical transmitter includes a light source; a signal processor; an optical modulator that modulates output light from the light source in accordance with a transmitting signal subjected to digital signal processing in the signal processor and outputs the modulated light as a light signal to a transmission path; and a control circuit that controls a carrier-wave frequency of the light signal output from the optical modulator, the signal processor including a mapping circuit that maps the transmitting signal to electric-field information according to a modulating scheme, and a phase rotating circuit that provides a phase rotation having a constant cycle to an electric-field phase of the electric-field information to which the mapping circuit maps the transmitting signal, the control circuit controlling the cycle of the phase rotation that the phase rotating circuit provides and thereby controlling the carrier-wave frequency of the light signal output from the optical modulator.
摘要翻译：光发射机包括光源; 一个信号处理器; 光调制器，其根据在信号处理器中进行数字信号处理的发送信号调制来自光源的输出光，并将调制光作为光信号输出到传输路径; 以及控制电路，其控制从所述光调制器输出的光信号的载波频率，所述信号处理器包括映射电路，所述映射电路根据调制方案将所述发送信号映射到电场信息;以及相位旋转电路，向映射电路映射发送信号的电场信息的电场相位提供恒定周期的相位旋转，控制电路控制相位旋转电路提供的相位旋转的周期，从而控制从光调制器输出的光信号的载波频率。

5. 发明申请

US20110170881A1 LIGHT RECEIVING DEVICE AND LIGHT RECEIVING METHOD 有权
标题翻译：光接收装置和光接收方法
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。

6. 发明申请

US20100303474A1 DIGITAL COHERENT OPTICAL RECEIVER 有权
标题翻译：数字相干光接收机
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。

7. 发明申请

US20100054759A1 Method for Electric Power Supply of Optical Receiver, Digital Signal Processing Circuit, and Optical Receiver 有权
标题翻译：光接收机，数字信号处理电路和光接收机的供电方法
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。

8. 发明授权

US07505414B2 Network designing device and computer-readable medium 有权
标题翻译：网络设计设备和计算机可读介质
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。

9. 发明申请

US20080297270A1 Driver circuit of optical modulator 失效
标题翻译：光调制器的驱动电路
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。

10. 发明申请

US20080080805A1 Compensating method and compensator of first-order polarization mode dispersion, and optical transmission system using same 审中-公开
标题翻译：一阶偏振模色散的补偿方法和补偿器，以及使用其的光传输系统
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。

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