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    Optical modulator and optical modulation control method
    4.
    发明授权
    Optical modulator and optical modulation control method 有权
    光调制器和光调制控制方法

    公开(公告)号：US08903239B2

    公开(公告)日：2014-12-02

    申请号：US13323022

    申请日：2011-12-12

    Applicant: Hiroshi Nishimoto ,  Hiroshi Kuwahara

    Inventor： Hiroshi Nishimoto ,  Hiroshi Kuwahara

    IPC: H04J14/02 ,  H04B10/04 ,  H04J14/08 ,  H04B10/50

    CPC classification number: G02F1/2257 ,  G02F1/0123 ,  G02F2001/212 ,  H04B10/50572 ,  H04B10/50575

    Abstract: An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator.

    Abstract translation: 光调制器包括：调制器，包括设置在具有电光效应的半导体衬底中的光波导和电极，以根据偏置电压和调制信号向光波导施加电场; 驱动电路，用于根据输入信号产生调制信号; 叠加器，用于将参考信号叠加在所述偏置电压上，所述参考信号的频率低于所述调制信号; 以及控制器，用于基于从调制器生成的调制光信号中提取的参考信号的频率分量来控制与调制器的调制方向正交的方向上的偏置电压。

    Transmission characteristic compensation control system
    5.
    发明授权
    Transmission characteristic compensation control system 失效

    公开(公告)号：US07103283B2

    公开(公告)日：2006-09-05

    申请号：US10123244

    申请日：2002-04-17

    Applicant: Satoshi Mikami ,  Kouichi Sawada ,  Hiroshi Nishimoto

    Inventor： Satoshi Mikami ,  Kouichi Sawada ,  Hiroshi Nishimoto

    IPC: H04B10/00

    CPC classification number: H04B10/2513 ,  H04B10/2572 ,  H04B2210/252 ,  H04B2210/254

    Abstract: A transmission characteristic compensation system enables to reduce the generation of transmission deterioration by estimating an initially selected control direction, and also to compensate in advance with a setting value estimation so as to suppress the generation of transmission deterioration in advance. The transmission characteristic compensation control system includes a variable compensator having a control circuit; and an optimal setting value calculation portion for calculating an optimal setting value for the control circuit, wherein the optimal setting value calculation portion estimates future transmission deterioration on a predetermined time-by-time basis to set into the control circuit the optimal setting value for compensating the estimated transmission deterioration performed by the variable compensator.

    Digital signal receiving apparatus, an optical transmission apparatus therewith, and a discriminating point control method
    6.
    发明申请
    Digital signal receiving apparatus, an optical transmission apparatus therewith, and a discriminating point control method 审中-公开
    数字信号接收装置，其光传输装置和鉴别点控制方法

    公开(公告)号：US20050149791A1

    公开(公告)日：2005-07-07

    申请号：US11023523

    申请日：2004-12-29

    Applicant: Hiroshi Nishimoto

    Inventor： Hiroshi Nishimoto

    IPC: G11B7/005 ,  G11B20/10 ,  H04B10/158 ,  H04B10/18 ,  G11B7/00 ,  G01R31/28 ,  G11B11/03 ,  G11B11/105 ,  G11B11/11 ,  G11B11/115 ,  G11B11/12 ,  G11B20/18 ,  G11B27/36

    CPC classification number: H04B10/2569 ,  G11B7/005 ,  G11B20/10009

    Abstract: A digital signal receiving apparatus is disclosed. The digital signal receiving apparatus includes a main signal discriminating unit configured to discriminate a main signal of a received signal, a monitor signal discriminating unit configured to discriminate a monitor signal of the received signal, an error monitoring unit configured to monitor a discriminating error of the monitor signal discriminating unit, and a discriminating point control unit configured to control the discriminating points of the main signal discriminating unit and the monitor signal discriminating unit. The discriminating point control unit monitors an output of the error monitoring unit, moves the discriminating point of the monitor signal discriminating unit in the amplitude directions and the phase directions such that a discriminating error occurs, detects a center of discriminating points where errors are generated, and sets the detected center of the discriminating points as the discriminating point of the main signal discriminating unit.

    Abstract translation: 公开了一种数字信号接收装置。 数字信号接收装置包括：主信号鉴别单元，被配置为鉴别接收信号的主信号;监视信号鉴别单元，被配置为鉴别接收信号的监视信号;误差监测单元，被配置为监视接收信号的鉴别误差; 监视信号识别单元，以及鉴别点控制单元，被配置为控制主信号鉴别单元和监视信号鉴别单元的识别点。 鉴别点控制单元监视误差监测单元的输出，在振幅方向和相位方向上移动监视信号鉴别单元的鉴别点，使鉴别误差发生，检测产生误差的识别点的中心， 并且将所检测的识别点的中心设置为主信号鉴别单元的识别点。

    Optical transmission device and optical communication system
    7.
    发明授权
    Optical transmission device and optical communication system 失效
    光传输设备和光通信系统

    公开(公告)号：US06449074B1

    公开(公告)日：2002-09-10

    申请号：US09039567

    申请日：1998-03-16

    Applicant: Satoru Okano ,  Hiroshi Nishimoto ,  Kazuo Yamane ,  Takashi Tsuda ,  Yumiko Kawasaki

    Inventor： Satoru Okano ,  Hiroshi Nishimoto ,  Kazuo Yamane ,  Takashi Tsuda ,  Yumiko Kawasaki

    IPC: H04J1402

    CPC classification number: H04B10/2942 ,  H04B10/077 ,  H04B10/07955 ,  H04B10/506 ,  H04J14/0221

    Abstract: The present invention relates to an optical transmission device and an optical communication system applied to wavelength division multiplexing (WDM). The optical transmission device includes an optical multiplexer for wavelength division multiplexing a plurality of optical signals to generate WDM signal light and outputting the WDM signal light to an optical transmission line, a detecting unit for detecting a break of each optical signal according to the power of each optical signal, and a compensator for adding light having a predetermined wavelength to the WDM signal light when at least one of the optical signals is cut off. Through the structure of the present invention it becomes possible to prevent a deterioration in transmission quality in the case that the number of WDM channels is changed.

    Abstract translation: 本发明涉及一种应用于波分复用（WDM）的光传输设备和光通信系统。 光传输装置包括：光复用器，用于对多个光信号进行波分复用，以产生WDM信号光并将WDM信号光输出到光传输线;检测单元，用于根据光信号的功率检测每个光信号的中断 每个光信号以及当至少一个光信号被切断时将具有预定波长的光添加到WDM信号光的补偿器。 通过本发明的结构，可以防止在WDM信道的数量改变的情况下传输质量的恶化。

    Optical amplifying apparatus
    8.
    发明授权
    Optical amplifying apparatus 有权
    光放大装置

    公开(公告)号：US6055094A

    公开(公告)日：2000-04-25

    申请号：US143404

    申请日：1998-08-28

    Applicant: Michikazu Shima ,  Hiroshi Nishimoto

    Inventor： Michikazu Shima ,  Hiroshi Nishimoto

    IPC: H04B10/2507 ,  H04B10/07 ,  H04B10/25 ,  H04B10/29 ,  H04B10/293 ,  H04B10/294 ,  H04B10/564 ,  H04B10/572 ,  H04J14/02 ,  H01S3/00

    CPC classification number: H04B10/2942 ,  H04B10/2912 ,  H04B10/2935 ,  H04J14/02 ,  H04B2210/003 ,  H04B2210/256

    Abstract: The object of the present invention is to provide an optical amplifying apparatus for collectively amplifying wavelength-division multiplexed signal lights, which can perform amplification in response to input signal light, whose power level is within a wide input dynamic range, without saturating, and which suppresses the influence of the wavelength dependency of gain thereof. Thus, this optical amplifying apparatus is composed of: three optical amplifying portions connected in cascade; an optical attenuating portion for controlling the level of signal light output from the optical amplifying portion provided in the post-stage by regulating the power level of signal light input to the optical amplifying portion provided in the middle stage; and a dispersion compensation fiber provided between the middle stage and post stage optical amplifying. A gain of each of the optical amplifying portions is controlled to be constant by an AGC circuit. As a result of providing the optical amplifying portions in a three-stage constitution, the gain of optical amplifying portion provided in the first stage can be set at a low value. Thus, even when a signal light having a high power level is input, the first stage optical amplifying portion does not saturate. Consequently, the gain is controlled to be constant.

    Abstract translation: 本发明的目的是提供一种用于共同放大波分复用信号光的光放大装置，其可以响应于功率水平处于宽输入动态范围内的输入信号光进行放大，而不会饱和，并且哪个 抑制其增益的波长依赖性的影响。 因此，该光放大装置由以下三个组成：串联连接的三个光放大部分; 光衰减部分，用于通过调节输入到设置在中间级的光放大部分的信号光的功率电平来控制从后级设置的光放大部分输出的信号光的电平; 以及设置在中间级和后级光放大之间的色散补偿光纤。 每个光放大部分的增益被AGC电路控制为恒定。 作为以三级结构提供光放大部分的结果，可以将设置在第一级中的光放大部分的增益设置为低值。 因此，即使当输入具有高功率电平的信号光时，第一级光放大部分也不饱和。 因此，增益被控制为恒定。

    Optical modulating device and optical modulating method
    9.
    发明授权
    Optical modulating device and optical modulating method 失效
    光调制装置及光调制方法

    公开(公告)号：US5926297A

    公开(公告)日：1999-07-20

    申请号：US828694

    申请日：1997-03-31

    Applicant: George Ishikawa ,  Hiroshi Nishimoto ,  Hiroki Ooi

    Inventor： George Ishikawa ,  Hiroshi Nishimoto ,  Hiroki Ooi

    IPC: G02F1/03 ,  G02B6/34 ,  H04B10/2513 ,  H04B10/516 ,  H04B10/54 ,  H04B10/58 ,  H04B10/61 ,  H04J14/08 ,  H04J14/00 ,  H04B10/00 ,  H04B10/02 ,  H04B10/04

    CPC classification number: G02B6/29355 ,  H04B10/25137 ,  H04J14/08 ,  H04B2210/258

    Abstract: An optical modulating method and an optical modulating device for optical time division multiplexing (OTDM). The optical modulating device comprises, for example, an optical switch for generating first and second optical clocks according to a carrier beam output from a light source, optical modulators for respectively switching on/off the optical clocks by data signals to thereby generate first and second signal beams, an optical multiplexer for combining the signal beams to generate an OTDM signal, and prechirp circuit for controlling, for example, the optical clocks so that the OTDM signal has a chirp parameter adapted to an optical transmission line. This optical modulation device is suitable for high-speed transmission and allows chromatic compensation.

    Abstract translation: 一种用于光时分复用（OTDM）的光调制方法和光调制装置。 光调制装置例如包括用于根据从光源输出的载波来产生第一和第二光时钟的光开关，用于分别通过数据信号接通/关闭光时钟的光调制器，从而产生第一和第二 信号光束，用于组合信号光束以产生OTDM信号的光复用器，以及用于控制例如光时钟的预跟踪电路，使得OTDM信号具有适于光传输线的啁啾参数。 该光调制装置适用于高速传输，可进行彩色补偿。

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