公开(公告)号：US09686019B2

公开(公告)日：2017-06-20

申请号：US13995279

申请日：2011-12-16

Applicant: Kiyoshi Fukuchi ,  Junichi Abe ,  Wakako Yasuda

Inventor： Kiyoshi Fukuchi ,  Junichi Abe ,  Wakako Yasuda

IPC: H04B10/61

CPC classification number: H04B10/616

Abstract: The disclosed coherent optical receiver includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; a skew addition unit; and a FFT operation unit. The 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs multiple optical signals separated into a plurality of signal components. The optoelectronic converter detects the optical signal and outputs a detected electrical signal. The analog-to-digital converter digitizes the detected electrical signal and outputs a detected digital signal. The skew addition unit adds to the detected digital signal an additional skew amount whose absolute value is equal to, whose sign is opposite to a skew amount of a difference in propagation delay in each lane connected to each output channel of the 90-degree hybrid circuit. The FFT operation unit performs a fast Fourier transform on the output from the skew addition unit.

公开(公告)号：US09088370B2

公开(公告)日：2015-07-21

申请号：US14577007

申请日：2014-12-19

Applicant: Junichi Abe ,  Wakako Yasuda ,  Kiyoshi Fukuchi

Inventor： Junichi Abe ,  Wakako Yasuda ,  Kiyoshi Fukuchi

IPC: H04B10/00 ,  H04B10/61

CPC classification number: H04B10/616 ,  H04B10/0775 ,  H04B10/6164 ,  H04B10/6165

Abstract: In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an inter-channel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source, a 90° hybrid circuit, an optoelectronic converter, an analog to digital converter, and a digital signal processing unit; wherein the 90° hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog to digital converter quantizes the detected electrical signals and outputs quantized signals; the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and an FFT operation unit for performing a fast Fourier transform process on the quantized signals; and wherein the difference in propagation delay is calculated on the basis of a plurality of peak values with a central focus on one peak value in the results of performing the fast Fourier transform process.

Abstract translation: 在相干光接收机中，如果发生信道间偏斜，则不可能进行足够的解调，因此接收性能恶化，因此，根据本发明的示例性方面的相干光接收机包括本地光源，90°混合电路， 光电转换器，模数转换器和数字信号处理单元; 其中所述90°混合电路使多路复用信号光干扰来自所述本地光源的局部光，并且输出分离成多个信号分量的多个光信号; 光电转换器检测光信号并输出​​检测到的电信号; 模数转换器对检测到的电信号进行量化并输出量化信号; 数字信号处理单元包括用于补偿多个信号分量之间的传播延迟差的偏斜补偿单元和用于对量化信号执行快速傅里叶变换处理的FFT运算单元; 并且其中基于执行快速傅里叶变换处理的结果中的中心聚焦于一个峰值的多个峰值来计算传播延迟的差异。

公开(公告)号：US20150098713A1

公开(公告)日：2015-04-09

申请号：US14577007

申请日：2014-12-19

Applicant: Junichi ABE ,  Wakako YASUDA ,  Kiyoshi FUKUCHI

Inventor： Junichi ABE ,  Wakako YASUDA ,  Kiyoshi FUKUCHI

IPC: H04B10/61

CPC classification number: H04B10/616 ,  H04B10/0775 ,  H04B10/6164 ,  H04B10/6165

Abstract: In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an inter-channel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source, a 90° hybrid circuit, an optoelectronic converter, an analog to digital converter, and a digital signal processing unit; wherein the 90° hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog to digital converter quantizes the detected electrical signals and outputs quantized signals; the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and an FFT operation unit for performing a fast Fourier transform process on the quantized signals; and wherein the difference in propagation delay is calculated on the basis of a plurality of peak values with a central focus on one peak value in the results of performing the fast Fourier transform process.

Abstract translation: 在相干光接收机中，如果发生信道间偏斜，则不可能进行足够的解调，因此接收性能恶化，因此，根据本发明的示例性方面的相干光接收机包括本地光源，90°混合电路， 光电转换器，模数转换器和数字信号处理单元; 其中所述90°混合电路使多路复用信号光干扰来自所述本地光源的局部光，并且输出分离成多个信号分量的多个光信号; 光电转换器检测光信号并输出​​检测到的电信号; 模数转换器对检测到的电信号进行量化并输出量化信号; 数字信号处理单元包括用于补偿多个信号分量之间的传播延迟差的偏斜补偿单元和用于对量化信号执行快速傅里叶变换处理的FFT运算单元; 并且其中基于执行快速傅里叶变换处理的结果中的中心聚焦于一个峰值的多个峰值来计算传播延迟的差异。

公开(公告)号：US20140328585A1

公开(公告)日：2014-11-06

申请号：US14362784

申请日：2011-12-07

Applicant: Manabu Arikawa ,  Daisaku Ogasahara ,  Emmanuel Le Taillandier De Gabory ,  Kiyoshi Fukuchi

Inventor： Manabu Arikawa ,  Daisaku Ogasahara ,  Emmanuel Le Taillandier De Gabory ,  Kiyoshi Fukuchi

IPC: H04B10/61 ,  H04B10/079

CPC classification number: H04B10/6162 ,  H04B10/0795 ,  H04B10/616

Abstract: It becomes difficult to perform the optimum equalization signal processing in coherent receiving systems if a channel response in an optical fiber transmission line includes a factor without temporal centrosymmetry, therefore, an equalization signal processor according to an exemplary aspect of the invention includes an equalization filter means configured to receive digital signals by coherent receiving systems; a coefficient control means configured to control coefficients defining characteristics of the equalization filter means; a significant coefficient holding means configured to hold significant coefficients of significant values among initial values of the coefficients; a significant coefficient positioning means configured to determine a significant coefficient position, a position of the significant coefficients in the initial values, so that equalization characteristics of the equalization filter means may be optimized; and a significant coefficient setting means configured to allocate the significant coefficients to the significant coefficient position.

Abstract translation: 如果光纤传输线路中的信道响应包含没有时间中心对称性的因素，则在相干接收系统中执行最佳均衡信号处理变得困难，因此根据本发明示例性方面的均衡信号处理器包括均衡滤波器装置 被配置为通过相干接收系统接收数字信号; 系数控制装置，被配置为控制限定所述均衡滤波器装置的特性的系数; 有效系数保持装置，被配置为在系数的初始值中保持有效值的有效系数; 确定有效系数位置的有效系数定位装置，初始值中有效系数的位置，使均衡滤波器装置的均衡特性可以被优化; 以及重要系数设定装置，被配置为将有效系数分配给有效系数位置。

公开(公告)号：US08515293B2

公开(公告)日：2013-08-20

申请号：US13138958

申请日：2010-04-21

Applicant: Wakako Yasuda ,  Daisaku Ogasahara ,  Kiyoshi Fukuchi

Inventor： Wakako Yasuda ,  Daisaku Ogasahara ,  Kiyoshi Fukuchi

IPC: H04B10/06

CPC classification number: H04B10/611 ,  H04B10/60 ,  H04B10/6166 ,  H04L27/223

Abstract: A coherent receiver 1 assigns a first transmission signal to first transmission polarization, assigns a second transmission signal to second transmission polarization, and receives a quadrature multiplexed signal formed by applying quadrature multiplexing to the first transmission polarization and the second transmission polarization. The coherent receiver includes a detection means 10 for detecting the first transmission polarization and the second transmission polarization according to prescribed first reception polarization and second reception polarization and obtaining a first detected signal and a second detected signal; a quantization means 20 for quantizing the first detected signal and the second detected signal and obtaining a first quantized signal and a second quantized signal; and a signal processing means 30 for, when filtering the first quantized signal and the second quantized signal using a prescribed filtering control algorithm to form a first demodulated signal and a second demodulated signal respectively, adjusting filter coefficients of the filtering control algorithm according to the first quantized signal and the second quantized signal and the first demodulated signal and the second demodulated signal, and outputting the first demodulated signal and the second demodulated signal to a first output terminal and a second output terminal, respectively.

Abstract translation: 相干接收机1将第一传输信号分配给第一传输极化，将第二传输信号分配给第二传输极化，并且接收通过对第一透射偏振和第二透射偏振应用正交多路复用形成的正交多路复用信号。 相干接收机包括检测装置10，用于根据规定的第一接收极化和第二接收极化检测第一透射偏振和第二透射偏振，并获得第一检测信号和第二检测信号; 量化装置20，用于量化第一检测信号和第二检测信号，并获得第一量化信号和第二量化信号; 以及信号处理装置30，用于当使用规定的滤波控制算法对第一量化信号和第二量化信号进行滤波以分别形成第一解调信号和第二解调信号时，根据第一信号调整滤波器控制算法的滤波器系数 量化信号和第二量化信号以及第一解调信号和第二解调信号，并将第一解调信号和第二解调信号分别输出到第一输出端和第二输出端。

公开(公告)号：US20110293287A1

公开(公告)日：2011-12-01

申请号：US13147079

申请日：2010-01-08

Applicant: Kiyoshi Fukuchi

Inventor： Kiyoshi Fukuchi

IPC: H04B10/12

CPC classification number: H04B10/25133 ,  H04B2210/252 ,  H04B2210/254

Abstract: An optical communication system in which optical transmitter 101 that modulates an electric signal to an optical signal and transmits the optical signal and optical receiver 108 that receives the optical signal are connected via transmission path 107, wherein, when a change in the dispersion amount of chromatic dispersion caused by the optical signal passing through transmission path 107 is nearly eliminated, optical transmitter 101 and optical receiver 108 decrease the absolute value of a receiver-side dispersion compensation amount while keeping the total value of a transmitter-side dispersion compensation amount for compensating for the dispersion amount by optical transmitter 101 and the receiver-side dispersion compensation amount for compensating for the dispersion amount by optical receiver 108 substantially constant.

Abstract translation: 一种光通信系统，其中通过传输路径107连接调制光信号的电信号并发送接收光信号的光信号和光接收机108的光发射机101，其中，当色散色散量的变化 通过传输路径107的光信号引起的色散几乎被消除，光发射机101和光接收机108降低接收机侧色散补偿量的绝对值，同时保持用于补偿的发射机侧色散补偿量的总值 光发射机101的色散量和用于补偿光接收机108的色散量基本上恒定的接收机侧色散补偿量。

公开(公告)号：US20100215365A1

公开(公告)日：2010-08-26

申请号：US12682367

申请日：2008-10-10

Applicant: Kiyoshi Fukuchi

Inventor： Kiyoshi Fukuchi

IPC: H04J14/00 ,  G02F1/225 ,  G02F1/01

CPC classification number: H04B10/5053 ,  G02F1/21 ,  G02F2001/212 ,  H04B10/5055 ,  H04B10/5561

Abstract: The optical modulator comprises an optical branching unit branching incident light into a first signal light and a second signal light; a first Mach-Zehnder modulator modulating the first signal light; a second Mach-Zehnder modulator modulating the second signal light; a phase shifter giving a fixed phase shift to the phase of the output light from the second Mach-Zehnder modulator; and an optical multiplexer multiplexing the output light from the first Mach-Zehnder modulator and the output light from the phase shifter. The phase shifter gives the phase shift so that the two input lights to the optical multiplexer have a phase difference of 60 degrees, and the first and second Mach-Zehnder modulators are driven by three-level signals.

Abstract translation: 光调制器包括将入射光分为第一信号光和第二信号光的光分支单元; 调制第一信号光的第一马赫 - 曾德调制器; 调制第二信号光的第二马赫 - 曾德调制器; 移相器，其给出来自第二马赫 - 策德尔调制器的输出光的相位的固定相移; 以及多路复用来自第一马赫 - 曾德调制器的输出光和来自移相器的输出光的光复用器。 移相器给出相移，使得光复用器的两个输入光具有60度的相位差，并且第一和第二马赫 - 曾德调制器由三电平信号驱动。

公开(公告)号：US20080232815A1

公开(公告)日：2008-09-25

申请号：US11916612

申请日：2006-06-28

Applicant: Satomi Shioiri ,  Toshiharu Itou ,  Kiyoshi Fukuchi ,  Hitoshi Takeshita

Inventor： Satomi Shioiri ,  Toshiharu Itou ,  Kiyoshi Fukuchi ,  Hitoshi Takeshita

IPC: H04B10/04 ,  H04B10/00

CPC classification number: H04J14/08 ,  H04B10/5561 ,  H04B10/66 ,  H04J14/02

Abstract: In the optical communication device and the optical communication system using DPSK modulation whose cost is low, whose size is small and whose power consumption is low, the N:1 multiplexer 125 generates a serial signal by multiplexing a parallel signal coded by the DPSK modulation coding units 115˜117 bit by bit on a time division basis. The electric-phase modulation optical converter 127 converts a serial signal into a phase modulation light. The N-bit delay interferometer 132 executes DPSK decoding with respect to a phase modulation light by comparison with an N-bit preceding optical signal. The optical-electric signal converter 134 converts a decoded intensity modulation light into an electric signal. The N:1 demultiplexer 136 divides an electric signal converted by the optical-electric signal converter 134 into a number N of signals bit by bit on a time division basis.

Abstract translation: 在光通信设备和使用成本低，尺寸小并且功耗低的DPSK调制的光通信系统中，N：1多路复用器125通过多路复用由DPSK调制编码编码的并行信号来生成串行信号 单位115〜117，按时间划分。 电相调制光转换器127将串行信号转换为相位调制光。 N位延迟干涉仪132通过与N位在前的光信号进行比较来执行相对于相位调制光的DPSK解码。 光电信号转换器134将解码的强度调制光转换成电信号。 N：1解复用器136将由光电信号转换器134转换的电信号分时分割为数字N个信号。

公开(公告)号：US20080138065A1

公开(公告)日：2008-06-12

申请号：US11878207

申请日：2007-07-23

Applicant: Kiyoshi Fukuchi

Inventor： Kiyoshi Fukuchi

IPC: H04B10/08 ,  H04B17/00

CPC classification number: H04B10/677

Abstract: An evaluation method of an optical receiver of an optical communication system, including: a DPSK (Differential Phase Shift Keying) signal modulated by a specific data series; a delay interferometer for performing delay detection on the DPSK signal; an optical receiver for receiving each of two optical outputs of the delay interferometer and outputting a difference signal; and a spectrum analyzer for measuring a spectrum of an output electrical signal of the optical receiver, comprising: monitoring a specific frequency component of the spectrum analyzer and detecting a delay difference and a deviation in optical reception level between the two outputs of the delay interferometer and the optical receiver.

Abstract translation: 一种光通信系统的光接收机的评估方法，包括：由特定数据序列调制的DPSK（差分相移键控）信号; 延迟干涉仪，用于对DPSK信号进行延迟检测; 光接收器，用于接收所述延迟干涉仪的两个光输出中的每一个并输出差分信号; 以及频谱分析器，用于测量光接收机的输出电信号的频谱，包括：监视频谱分析仪的特定频率分量并检测延迟干涉仪的两个输出之间的延迟差和光接收电平的偏差，以及 光接收机。

公开(公告)号：US07126321B2

公开(公告)日：2006-10-24

申请号：US11339631

申请日：2006-01-26

Applicant: Satomi Shioiri ,  Kiyoshi Fukuchi

Inventor： Satomi Shioiri ,  Kiyoshi Fukuchi

IPC: G01R23/16

CPC classification number: G01R31/2813 ,  G01R27/04 ,  G01R27/32 ,  G01R31/11

Abstract: Transmission delay time measurement is performed on a signal propagation path between respective points of two printed circuit boards connected by a coaxial cable. Measurement is made of a frequency-domain response of the cable and a first time-domain response of the propagation path at its sending point and a second time-domain response of the propagation path at its receiving point. From the first time-domain response and the frequency-domain response, estimation is made of a third time-domain response of the propagation path that would be observed at the receiving point if there is no waveform distortion on the surface of the printed circuit boards. Time-domain correlation is calculated between the second and third time-domain responses. A first delay time is determined from the estimated time-domain response and a second delay time is determined from the correlation. The first and second delay times are summed to yield the transmission delay time of the propagation path.