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51. 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。

52. 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。

53. 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。

54. 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。

55. 发明授权

US09014575B2 Sampling clock synchronizing apparatus, digital coherent receiving apparatus, and sampling clock synchronizing method 有权
标题翻译：采样时钟同步装置，数字相干接收装置和采样时钟同步方法
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。

56. 发明授权

US08649685B2 Light receiving device and light receiving method 有权
标题翻译：光接收装置及光接收方式
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。

57. 发明授权

US08406635B2 Optical communication system and optical receiver 有权
标题翻译：光通信系统和光接收机
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。

58. 发明授权

US07680419B2 Repeater and repeating method 有权
标题翻译：中继器和重复方法
公开(公告)号：US07680419B2
公开(公告)日：2010-03-16
申请号：US11445148
申请日：2006-06-02
申请人： Hisao Nakashima , Takeshi Hoshida
发明人： Hisao Nakashima , Takeshi Hoshida
IPC分类号： H04B10/00
CPC分类号： H04B10/299 , H04B2210/258
摘要： A repeater is disclosed that transmits an optical signal using wave division multiplexing. The repeater includes a demultiplexing unit that separates plural channels contained in the optical signal, an adjusting unit that adjusts at least optical power of each of the channels according to a control signal, a multiplexing unit that outputs a multiple wavelength signal in which the channels are multiplexed, and a monitoring unit that determines a modulation scheme and a bit rate of the optical signal for each of the channels so as to generate the control signal.
摘要翻译：公开了使用波分复用来发送光信号的中继器。中继器包括：分离单元，分离包含在光信号中的多个信道;调节单元，用于根据控制信号调整至少每个信道的光功率;多路复用单元，其输出信道为以及监测单元，其确定每个信道的光信号的调制方案和比特率，以便产生控制信号。

59. 发明申请

US20070201878A1 Repeater and repeating method 有权
标题翻译：中继器和重复方法
公开(公告)号：US20070201878A1
公开(公告)日：2007-08-30
申请号：US11445148
申请日：2006-06-02
申请人： Hisao Nakashima , Takeshi Hoshida
发明人： Hisao Nakashima , Takeshi Hoshida
IPC分类号： H04B10/00
CPC分类号： H04B10/299 , H04B2210/258
摘要： A repeater is disclosed that transmits an optical signal using wave division multiplexing. The repeater includes a demultiplexing unit that separates plural channels contained in the optical signal, an adjusting unit that adjusts at least optical power of each of the channels according to a control signal, a multiplexing unit that outputs a multiple wavelength signal in which the channels are multiplexed, and a monitoring unit that determines a modulation scheme and a bit rate of the optical signal for each of the channels so as to generate the control signal.
摘要翻译：公开了使用波分复用来发送光信号的中继器。中继器包括：分离单元，分离包含在光信号中的多个信道;调节单元，用于根据控制信号调整至少每个信道的光功率;多路复用单元，其输出信道为以及监测单元，其确定每个信道的光信号的调制方案和比特率，以便产生控制信号。

60. 发明授权

US08526828B2 Optical transmitter and optical transmitter unit 有权
标题翻译：光发射机和光发射机单元
公开(公告)号：US08526828B2
公开(公告)日：2013-09-03
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
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。

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