公开(公告)号：US06671464B1

公开(公告)日：2003-12-30

申请号：US09349201

申请日：1999-07-07

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B1008

CPC classification number: H04B10/2569

Abstract: The present invention offers a polarization mode dispersion compensator and a compensation method for polarization mode dispersion having simple constitution and being strong against external disturbances. The polarization mode dispersion compensator, a representative example of the present invention, is provided with a compensation circuit for polarization mode dispersion, a degree of polarization measuring circuit, and a control circuit. An optical signal is input to the compensation circuit for polarization mode dispersion through an optical fiber, and after the process of compensation for polarization mode dispersion, it is output to an optical fiber. An optical coupler divides a part of the optical signal passing through the optical fiber. The degree of polarization measuring circuit finds the degree of polarization of the divided optical signal. The control circuit generates a control signal based on the degree of polarization obtained in the above, and so controls the compensation circuit for polarization mode dispersion as to make the degree of polarization maximum.

Abstract translation: 本发明提供了一种偏振模色散补偿器和用于偏振模色散的补偿方法，其结构简单，抗外部干扰强。 作为本发明的代表性例子的偏振模色散补偿器设置有用于偏振模色散的补偿电路，偏振度测量电路和控制电路。 光信号通过光纤输入到补偿电路进行偏振模色散，在偏振模色散补偿处理后，输出到光纤。 光耦合器分隔通过光纤的一部分光信号。 偏振测量电路的程度找到分割的光信号的偏振度。 控制电路基于上述获得的极化度产生控制信号，因此控制用于偏振模色散的补偿电路，使偏振度最大化。

公开(公告)号：US06532320B1

公开(公告)日：2003-03-11

申请号：US09660493

申请日：2000-09-12

Applicant: Nobuhiko Kikuchi ,  Shinya Sasaki

Inventor： Nobuhiko Kikuchi ,  Shinya Sasaki

IPC: G02B628

CPC classification number: H04J14/0213 ,  H04J14/02 ,  H04J14/0201 ,  H04J14/0209 ,  H04J14/0212 ,  H04L25/14

Abstract: The technical problem disclosed concerns increase of transmission distance between inter-site transmission parts when a circuit speed is increased, and simplification of an intra-site circuit. The means to resolve the problem is as follows. An intra-site circuit connecting an intra-site information communications device 140-1 and a wavelength division multiplexing optical transmission device 147 is demultiplexed into plural low speed wavelength division multiplexing signals by a transponder 100 according to this invention, and transmitted to an inter-site optical fiber circuit 144. The signals are again multiplexed into a high-speed optical signal by a transponder 110 in a wavelength division multiplexing optical transmission device 148 on the receiving side, and transmitted to an intra-site optical fiber circuit 143-1.

Abstract translation: 所公开的技术问题涉及当电路速度增加时站点间传输部件之间的传输距离的增加以及站内电路的简化。 解决问题的方法如下。 连接站内信息通信设备140-1和波分复用光传输设备147的站内电路由根据本发明的应答器100解复用为多个低速波分复用信号， 在接收侧的波分多路复用光传输装置148中，应答器110将这些信号再次复用成高速光信号，并发送到站内光纤电路143-1。

公开(公告)号：US08873968B2

公开(公告)日：2014-10-28

申请号：US12300212

申请日：2006-05-11

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/12 ,  H04B10/69 ,  H04B10/67

CPC classification number: H04B10/672 ,  H04B10/69 ,  H04L7/0008 ,  H04L7/0075

Abstract: An optical field receiver comprises an optical branching circuit for branching a received optical multilevel signal into first and second optical signals, a first optical delayed demodulator for performing delayed demodulation on the first optical signal at a delay time T (T=symbol time), a second optical delayed demodulator for performing delayed demodulation on the second optical signal at the delay time T with an optical phase difference deviating from the first optical delayed demodulator by 90°, first and second optical receivers for converting each of the delayed demodulation signals representing x and y components of complex signals output from the first and second delayed demodulators into first and second electrical signals, and a field processing unit fort generating a first reconstructed signal representing an inter-symbol phase difference or a phase angle of a received symbol from the first and second electrical signals for each symbol time T.

Abstract translation: 一种光场接收机包括一个用于将接收的光多值信号分支为第一和第二光信号的光分支电路，用于在延迟时间T（T =符号时间）下对第一光信号执行延迟解调的第一光延迟解调器， 第二光延迟解调器，用于以延迟时间T对第二光信号执行延迟解调，光偏移与第一光延迟解调器相差90°;第一和第二光接收机，用于转换表示x和 从第一和第二延迟解调器输出的复信号的y个分量转换成第一和第二电信号;以及场处理单元，其生成表示来自第一和第二电信号的接收符号的符号间相位差或相位角的第一重构信号， 每个符号时间T的第二个电信号。

公开(公告)号：US08655193B2

公开(公告)日：2014-02-18

申请号：US13201278

申请日：2009-03-02

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/06 ,  H04B10/00

CPC classification number: H04B10/5055 ,  H04B10/541 ,  H04B10/676 ,  H04B10/695 ,  H04L25/061 ,  H04L27/3845

Abstract: Provided is an optical multilevel transmission system, comprising at least one optical multilevel transmitter for transmitting an optical multilevel signal obtained and an optical multilevel receiver for receiving the optical multilevel signal. The received optical multilevel signal has a larger noise in an angular direction than in a radial direction. The optical multilevel receiver sets, in a symbol decision of the received optical multilevel signal demodulated on the complex plane, for positions of all or some of ideal signal points, a width in the angular direction of a decision area, to which each of the ideal signal points belongs and which is measured along a circumference of a circle centered at an origin and passing through a center of the each of the ideal signal points, larger than a width in the angular direction of a decision area defined based on a Euclidean distance.

Abstract translation: 提供了一种光学多电平传输系统，包括至少一个光学多电平发射机，用于发射所获得的光学多电平信号和用于接收光学多电平信号的光学多电平接收机。 所接收的光学多电平信号在角度方向上具有比径向方向更大的噪声。 光复用多电平接收机在复平面解调的接收光多电平信号的符号判定中，针对理想信号点的全部或一部分的位置，确定每个理想信号点的角度方向上的宽度 信号点属于并沿着以原点为中心并穿过每个理想信号点的中心的圆的圆周测量，大于基于欧几里得距离定义的判定区域的角度方向上的宽度。

公开(公告)号：US08520196B2

公开(公告)日：2013-08-27

申请号：US13363883

申请日：2012-02-01

Applicant: Riu Hirai ,  Nobuhiko Kikuchi ,  Tetsuya Uda ,  Shinya Sasaki

Inventor： Riu Hirai ,  Nobuhiko Kikuchi ,  Tetsuya Uda ,  Shinya Sasaki

IPC: G01N21/00

CPC classification number: H04B10/0791 ,  H04B10/071

Abstract: Bending of an optical fiber where a heat may be generated by a high output power can be detected without using a dedicated light source. An optical communication module that outputs a continuous wave light generated by at least one light source to an optical fiber transmission line, includes: (1) a loss measurement unit that measures a loss of an amplified spontaneous emission generated by allowing the continuous wave light output from the light source to create stimulated Raman scattering in the optical fiber transmission line; (2) a fiber abnormality analyzer that detects the abnormal state of the optical fiber transmission line on the basis of loss information on the ASE measured by the loss measurement unit; and (3) a light source controller that controls a supply state of the continuous wave light from the light source on the basis of the detection of the fiber abnormality analyzer.

Abstract translation: 可以在不使用专用光源的情况下检测可以通过高输出功率产生热量的光纤的弯曲。 将由至少一个光源产生的连续波光输出到光纤传输线的光通信模块包括：（1）损耗测量单元，其测量通过允许连续波光输出产生的放大的自发发射的损耗 从光源到光纤传输线中产生受激拉曼散射; （2）光纤异常分析装置，根据由损失测量部测得的ASE的损失信息，检测光纤传输线的异常状态; 以及（3）光源控制器，其基于光纤异常分析仪的检测来控制来自光源的连续波光的供给状态。

公开(公告)号：US20130108276A1

公开(公告)日：2013-05-02

申请号：US13808488

申请日：2010-07-09

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/00 ,  H04B10/60

CPC classification number: H04B10/00 ,  H04B10/60 ,  H04B10/612 ,  H04B10/677 ,  H04B10/697

Abstract: Optical receiver 300 uses two optical delay detectors 223 (set such that the delay times T are equal to symbol time and the phase differences are zero and 90 degrees) to receive an optical multilevel signal 215 and the output signals are A/D converted, thereafter subjected to retiming processes, and then subjected to a differential phase detection, thereby detecting a differential phase at a symbol center time point. In the receiver, the detected differential phase is integrated for each symbol and thereafter combined with an amplitude component obtained from a separately disposed optical intensity receiver, thereby reproducing an optical electric field. Thereafter, a wavelength dispersion compensation circuit (231) of a time period T is used to compensate for the wavelength dispersion of the transmission path. Moreover, an electric or optical Nyquist filter may be inserted to perform a band limitation, thereby enhancing the wavelength dispersion compensation effect.

Abstract translation: 光接收器300使用两个光学延迟检测器223（设置为延迟时间T等于符号时间，相位差为零和90度），以接收光学多电平信号215，然后将输出信号进行A / D转换 进行重新定时处理，然后进行差分相位检测，从而在符号中心时间点检测差分相位。 在接收机中，检测到的差分相位对于每个符号被积分，然后与从单独设置的光强度接收器获得的振幅分量相结合，从而再现光电场。 此后，使用时间段T的波长色散补偿电路（231）来补偿传输路径的波长色散。 此外，可以插入电或光奈奎斯特滤波器来执行频带限制，从而增强波长色散补偿效果。

公开(公告)号：US08340533B2

公开(公告)日：2012-12-25

申请号：US12485574

申请日：2009-06-16

Applicant: Kohei Mandai ,  Nobuhiko Kikuchi

Inventor： Kohei Mandai ,  Nobuhiko Kikuchi

IPC: H04B10/06

CPC classification number: H04B10/677 ,  H04B10/60

Abstract: An optical balanced receiver including an optical coupler for combining input optical information signal and optical reference signal and outputting two optical interfering signals whose phases are opposite to each other, two photodetectors for receiving the two optical interfering signals and outputting detection signals as electrical signals having the amplitudes corresponding to the interference intensities of the received optical interfering signals, a balance compensation type difference device for compensating an intensity fluctuation component added to a difference signal of the two detection signals due to the difference in amplitude and/or delay between the detection signals output from the two photodetectors in accordance with an input control signal, and outputting the compensated difference signal of the two detection signals, and a control circuit for outputting the control signal to the balance compensation type difference device.

Abstract translation: 一种光学平衡接收机，包括用于组合输入光信息信号和光参考信号的光耦合器，并输出相位彼此相反的两个光干涉信号，两个光电检测器，用于接收两个光干涉信号，并将检测信号作为电信号输出， 对应于接收到的光干涉信号的干涉强度的幅度，用于补偿由于检测信号输出之间的幅度差和/或延迟引起的两个检测信号的差分信号相加的强度波动分量的平衡补偿型差分装置 根据输入控制信号从两个光电检测器输出并输出两个检测信号的补偿差分信号，以及用于将控制信号输出到平衡补偿型差分装置的控制电路。

公开(公告)号：US08184992B2

公开(公告)日：2012-05-22

申请号：US12439705

申请日：2006-09-26

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/06

CPC classification number: H04B10/613 ,  H04B10/61 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6163 ,  H04L25/03057 ,  H04L27/223

Abstract: An optical field receiver comprises an optical brancher that branches a received optical multilevel signal into first and second optical signals; an optical delayed detector that performs delayed detection on the first optical signal by a delayed detector with a delay time of T/2 (where T is equal to a symbol time) and a phase difference of 90 degrees; a balanced optical receiver that converts the optical signal outputted from the first delay detector to an electric signal; and an optical intensity receiver that converts the second optical signal to an electric signal; and an electric field calculating part that generates, from the output signals of the first and second optical receivers, first and second reproduced signals indicative of the phase angle and amplitude value of the received symbol represented by the complex signal in each symbol time T.

Abstract translation: 光场接收器包括将接收的光学多电平信号分支为第一和第二光信号的光分支器; 光延迟检测器，通过具有T / 2的延迟时间（T等于符号时间）和90度的相位差的延迟检测器对第一光信号执行延迟检测; 平衡光接收器，其将从第一延迟检测器输出的光信号转换为电信号; 以及将所述第二光信号转换为电信号的光强度接收器; 以及电场计算部，其从所述第一和第二光接收机的输出信号生成表示在每个符号时间T中由复信号表示的接收符号的相位角和振幅值的第一再生信号和第二再生信号。

公开(公告)号：US20100021179A1

公开(公告)日：2010-01-28

申请号：US12439705

申请日：2006-09-26

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/06 ,  H04B10/04

CPC classification number: H04B10/613 ,  H04B10/61 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6163 ,  H04L25/03057 ,  H04L27/223

Abstract: An optical field receiver comprises an optical brancher that branches a received optical multilevel signal into first and second optical signals; an optical delayed detector that performs delayed detection on the first optical signal by a delayed detector with a delay time of T/2 (where T is equal to a symbol time) and a phase difference of 90 degrees; a balanced optical receiver that converts the optical signal outputted from the first delay detector to an electric signal; and an optical intensity receiver that converts the second optical signal to an electric signal; and an electric field calculating part that generates, from the output signals of the first and second optical receivers, first and second reproduced signals indicative of the phase angle and amplitude value of the received symbol represented by the complex signal in each symbol time T.

Abstract translation: 光场接收器包括将接收的光学多电平信号分支为第一和第二光信号的光分支器; 光延迟检测器，通过具有T / 2的延迟时间（T等于符号时间）和90度的相位差的延迟检测器对第一光信号执行延迟检测; 平衡光接收器，其将从第一延迟检测器输出的光信号转换为电信号; 以及将所述第二光信号转换为电信号的光强度接收器; 以及电场计算部，其从所述第一和第二光接收器的输出信号生成表示在每个符号时间T中由复信号表示的接收符号的相位角和振幅值的第一再生信号和第二再现信号。

公开(公告)号：US07616318B2

公开(公告)日：2009-11-10

申请号：US11511221

申请日：2006-08-29

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: G01B9/02

CPC classification number: G01J9/02 ,  G01J11/00

Abstract: An electric field waveform of an optical signal is precisely measured with high time resolution. Particularly, determination of inter-symbol interference has been difficult. Output light from the laser source is divided into first and second portions. The first portion is modulated by an optical modulator. The second portion is delayed by a delay line for the same quantity of delay as that of the first portion. The first and second portions are fed to a phase diversity circuit to configure a homodyne interferometer. An optical input sampling oscilloscope stabilizes a variable optical phase shifter to set an optical phase at a particular point of time to a fixed value using a pattern sync signal as a reference. An optical input sampling oscilloscope repeatedly averages optical waveforms and a CPU conducts three-dimensional display of the optical electric field waveform from which noise has been removed.

Abstract translation: 以高时间分辨率精确测量光信号的电场波形。 特别地，确定符号间干扰是困难的。 来自激光源的输出光被分成第一和第二部分。 第一部分由光学调制器调制。 第二部分延迟与第一部分相同数量的延迟延迟线。 第一和第二部分被馈送到相位分集电路以配置零差干涉仪。 光输入采样示波器稳定可变光移相器，使用图案同步信号作为参考，将特定时间点的光相位设置为固定值。 光输入采样示波器重复地对光波形进行平均，CPU执行已消除噪声的光电波形的三维显示。