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：US08553825B2

公开(公告)日：2013-10-08

申请号：US12708859

申请日：2010-02-19

申请人： Kiichi Sugitani ,  Kazunari Shiota ,  Yuji Ishii ,  Hisao Nakashima

发明人： Kiichi Sugitani ,  Kazunari Shiota ,  Yuji Ishii ,  Hisao Nakashima

IPC分类号： H04L7/00

CPC分类号： H04B10/61

摘要： A phase synchronization method uses a removal path for removing an error component contained in an input signal and a delay addition path for adding a delay corresponding to a processing time period taken to remove the error component in the removal path. The removal path includes an averaging section. The averaging section includes a shift register and an obtaining unit. The shift register stores as many data as the maximum number of data to be averaged and successively receives processing data from which the error component has been extracted in the removal path. The obtaining unit obtains, among the successive processing data input to the shift register, as many processing data as the number of data to be averaged from a position near the center toward both ends in the shift register.

摘要翻译： 相位同步方法使用去除包含在输入信号中的误差分量的去除路径和用于增加与去除去除路径中的误差分量所花费的处理时间相对应的延迟的延迟相加路径。 去除路径包括平均部分。 平均部分包括移位寄存器和获取单元。 移位寄存器存储与要平均的数据的最大数量一样多的数据，并且连续地接收在删除路径中从其中提取了错误分量的处理数据。 获取单元从输入到移位寄存器的连续处理数据中，从移位寄存器中的中心附近的位置到两端的位置获得与要平均化的数据数量相同的处理数据。

公开(公告)号：US08532503B2

公开(公告)日：2013-09-10

申请号：US12580629

申请日：2009-10-16

申请人： Hisao Nakashima ,  Takahito Tanimura

发明人： Hisao Nakashima ,  Takahito Tanimura

IPC分类号： H04B10/06

CPC分类号： H04B10/611 ,  H04B10/60 ,  H04B10/614

摘要： An optical receiver includes a photo-detector that converts a received optical signal into an electric signal and outputs the electric signal, a converter that converts the electric signal into a parallel data signal and outputs the parallel data signal, and parallel-number changer changing a parallel number of the parallel data signal in accordance with a bit rate of the optical signal and outputting the parallel data signal having the changed parallel number.

摘要翻译： 光接收机包括光接收器，其将接收到的光信号转换为电信号并输出​​电信号;将电信号转换成并行数据信号并输出​​并行数据信号的转换器，以及并行数变换器 根据光信号的比特率并行数据信号的并行数，并输出具有改变的并行数的并行数据信号。

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.

公开(公告)号：US20120308227A1

公开(公告)日：2012-12-06

申请号：US13446177

申请日：2012-04-13

申请人： Kosuke KOMAKI ,  Hisao Nakashima

发明人： Kosuke KOMAKI ,  Hisao Nakashima

IPC分类号： H04B10/08

CPC分类号： H04B10/25073 ,  H04B10/2569 ,  H04B10/6971 ,  H04L7/0087 ,  H04L7/0335

摘要： A digital coherent receiver includes a sampling phase detector to detect a phase of a sampled digital signal, and a phase adjustor to adjust the sampling phase of the digital signal based upon the detected phase. The phase detector includes filters to equalize the digital signal with different equalization characteristics; sensitivity monitoring phase detectors, each connected to one of the filters and outputting a phase detection signal representing the phase of the output signal from the associated filter together with a sensitivity monitoring signal representing the sensitivity of the phase detection; sensitivity correction coefficient generators, each generating a sensitivity correction coefficient for correcting the associated phase detection signal using a square sum of the sensitivity monitoring signals; and an adder to add the phase detection signals that have been corrected by the sensitivity correction coefficients, and output a phase signal.

摘要翻译： 数字相干接收机包括：采样相位检测器，用于检测采样数字信号的相位;以及相位调节器，用于根据检测到的相位调整数字信号的采样相位。 相位检测器包括滤波器，以均衡具有不同均衡特性的数字信号; 灵敏度监视相位检测器，每个检测器连接到滤波器之一并输出表示来自相关滤波器的输出信号的相位的相位检测信号以及表示相位检测的灵敏度的灵敏度监视信号; 灵敏度校正系数发生器，每个灵敏度校正系数发生器使用平方和的灵敏度监视信号产生用于校正相关联的相位检测信号的灵敏度校正系数; 以及加法器，将通过灵敏度校正系数校正的相位检测信号相加，并输出相位信号。

公开(公告)号：US08301039B2

公开(公告)日：2012-10-30

申请号：US12620540

申请日：2009-11-17

申请人： Masato Nishihara ,  Tomoo Takahara ,  Hisao Nakashima

发明人： Masato Nishihara ,  Tomoo Takahara ,  Hisao Nakashima

IPC分类号： H04B10/06

CPC分类号： H04B10/614 ,  H04B10/61 ,  H04B10/613 ,  H04B10/6165

摘要： A delay device that provides a delay amount to at least one of the in-phase signal and the quadrature signal, and a delay control section that controls the delay amount provided by the delay device based on a quality of the signals when the in-phase signal and the quadrature signal, to the at least one of which the delay amount is provided, at the delay device are converted into digital signals by the analog-digital converter, and the digital signal processing is carried out at the processor are provided. Thereby, the signal quality of recovered data at a receiving end of a multi-level phase modulation communication system is improved.

摘要翻译： 一种向至少一个同相信号和正交信号提供延迟量的延迟装置，以及延迟控制部分，当延迟装置根据同相信号和正交信号中的信号质量， 信号和正交信号至延迟装置中提供的延迟量中的至少一个被模拟数字转换器转换成数字信号，并且在处理器处执行数字信号处理。 因此，提高了在多级相位调制通信系统的接收端的恢复数据的信号质量。