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    Pre-emphasis method in an optical communication system
    3.
    发明公开
    Pre-emphasis method in an optical communication system 审中-公开
    在einem optischen社区系统中的Präemphase-Verfahren

    公开(公告)号：EP1947786A2

    公开(公告)日：2008-07-23

    申请号：EP08006797.8

    申请日：2000-11-20

    申请人： Fujitsu Limited

    发明人： Sakamoto, Takeshi ,  Tomofuji, Hiroaki ,  Onaka, Hiroshi ,  Sekiya, Motoyoshi ,  Yamane, Kazuo ,  Terahara, Takafumi ,  Murakami, Makato

    IPC分类号： H04B10/08 ,  H04B10/17

    CPC分类号： H04B10/07953 ,  H04B10/0799

    摘要： The method of pre-emphasizing a plurality of optical signals in wavelength-division multiplexing optical signals inputted to an optical transmission line having a plurality of stations connected in-between which are provided with an optical amplifier, comprising the steps of:
    obtaining a predetermined physical quantity in a plurality of stations;
    respectively obtaining a partial optical signal-to-noise ratio of each of a plurality of optical signals in said plurality of stations according to said predetermined physical quantity;
    obtaining a sum of said partial optical signal-to-noise ratios of all of said optical signals amplified in each of said stations and an average value of said ratios;
    respectively obtaining a difference value of said each optical signal in said plurality of stations, of which the value is between said average value and said partial optical signal-noise ratio;
    obtaining a sum of said difference values in said stations wherein said optical signals are amplified, and
    regulating optical levels of said plurality of optical signals so that sums of said obtained difference values become all zero.

    摘要翻译： 输入到具有连接在其上的多个站的光传输线的波分复用光信号中的多个光信号的预加强方法包括以下步骤：获得预定的物理 数量在多个站; 分别根据所述预定物理量获得所述多个站中的多个光信号中的每一个的部分光信噪比; 获得在每个所述站中放大的所有所述光信号的所述部分光信噪比之和和所述比率的平均值之和; 分别获得所述多个站中的所述每个光信号的差值，其中值在所述平均值和所述部分光信号噪声比之间; 在所述站中获得所述差值的总和，其中所述光信号被放大，并且调节所述多个光信号的光电平，使得所获得的差值的和变为全零。

    Optical transmission system, optical multiplexing transmission system, and related peripheral techniques
    4.
    发明公开
    Optical transmission system, optical multiplexing transmission system, and related peripheral techniques 失效
    OptischesÜbertragungssystem，optischesMultiplexingübertragungssystemunddazugehörigeVerfahren

    公开(公告)号：EP1536257A2

    公开(公告)日：2005-06-01

    申请号：EP05003243.2

    申请日：1995-08-02

    申请人： FUJITSU LIMITED

    发明人： Ishikawa, George ,  Nishimoto, Hiroshi ,  Ooi, Hiroki ,  Sekiya, Motoyoshi ,  Tomofuji, Hiroaki

    IPC分类号： G02B6/293

    CPC分类号： H04B10/25133 ,  G02F2203/21 ,  H04B10/0795 ,  H04B10/07957 ,  H04B10/0797 ,  H04B10/0799 ,  H04B10/25137 ,  H04B10/2525 ,  H04B10/255 ,  H04B10/2563 ,  H04B10/66 ,  H04B10/67 ,  H04B10/675 ,  H04B2210/252 ,  H04B2210/254 ,  H04J14/02 ,  H04J14/0298 ,  H04J14/08 ,  H04J14/086 ,  H04L7/0037 ,  H04L7/0075 ,  H04L7/027 ,  H04L7/06 ,  H04Q11/0001

    摘要： The invention provides a technique for optimizing transmission conditions to achieve large-capacity transmission, and also provides peripheral techniques for the practical implementation of optical multiplexing that makes large-capacity transmission possible. A transmission characteristic is measured in a transmission characteristic measuring section (53), and control of signal light wavelength in a tunable light source (44), control of the amount of prechirping, control of the amount of dispersion compensation, and/or control of optical power are performed to achieve the best transmission characteristic. Wavelength dispersion is deliberately introduced by a dispersion compensator, to reduce nonlinear effects. A tunable laser is used to optimize signal light wavelength for each optical amplification repeater section. Peripheral techniques, such as drift compensation, clock extraction, optical signal channel identification, clock phase stabilization, etc., are provided for the implementation of optical multiplexing.

    摘要翻译： 本发明提供一种用于优化传输条件以实现大容量传输的技术，并且还提供了实现实现大容量传输可能的光复用的外围技术。 在透射特性测量部分（53）中测量传输特性，并且在可调谐光源（44）中控制信号光波长，控制预激光量，色散补偿量的控制和/或控制 执行光功率以实现最佳传输特性。 波长色散由色散补偿器故意引入，以减少非线性效应。 可调激光器用于优化每个光放大中继器部分的信号光波长。 提供了诸如漂移补偿，时钟提取，光信号通道识别，时钟相位稳定等的外围技术用于实现光学多路复用。

    Pre-emphasis method in an optical communication system
    7.
    发明公开
    Pre-emphasis method in an optical communication system 审中-公开
    在光通信系统中的预加重方法

    公开(公告)号：EP1947786A3

    公开(公告)日：2008-07-30

    申请号：EP08006797.8

    申请日：2000-11-20

    申请人： Fujitsu Limited

    发明人： Sakamoto, Takeshi ,  Tomofuji, Hiroaki ,  Onaka, Hiroshi ,  Sekiya, Motoyoshi ,  Yamane, Kazuo ,  Terahara, Takafumi ,  Murakami, Makato

    IPC分类号： H04B10/08 ,  H04B10/17

    CPC分类号： H04B10/07953 ,  H04B10/0799

    摘要： The method of pre-emphasizing a plurality of optical signals in wavelength-division multiplexing optical signals inputted to an optical transmission line having a plurality of stations connected in-between which are provided with an optical amplifier, comprising the steps of:
    obtaining a predetermined physical quantity in a plurality of stations;
    respectively obtaining a partial optical signal-to-noise ratio of each of a plurality of optical signals in said plurality of stations according to said predetermined physical quantity;
    obtaining a sum of said partial optical signal-to-noise ratios of all of said optical signals amplified in each of said stations and an average value of said ratios;
    respectively obtaining a difference value of said each optical signal in said plurality of stations, of which the value is between said average value and said partial optical signal-noise ratio;
    obtaining a sum of said difference values in said stations wherein said optical signals are amplified, and
    regulating optical levels of said plurality of optical signals so that sums of said obtained difference values become all zero.

    Optical communication apparatus, system and method that compensate for chromatic dispersion
    10.
    发明公开
    Optical communication apparatus, system and method that compensate for chromatic dispersion 有权
    OptischeÜbertragungsvorrichtungund Verfahren zur Kompensation der chromatischen Dispersion

    公开(公告)号：EP1265380A2

    公开(公告)日：2002-12-11

    申请号：EP01123246.9

    申请日：2001-10-02

    申请人： FUJITSU LIMITED

    发明人： Katagiri, Toru ,  Tomofuji, Hiroaki ,  Onaka, Hiroshi

    IPC分类号： H04B10/17 ,  H04B10/18

    CPC分类号： H04B10/2916 ,  H04B10/2525 ,  H04B2210/003 ,  H04B2210/258

    摘要： An optical communication apparatus performs wavelength division multiplexing with respect to signals of a plurality of signal transmission bands. The apparatus includes a first optical unit which effects distributed Raman amplification and has a characteristic that compensates for dispersion of a transmission path to which the optical communication apparatus is connected, with respect to at least one of the signal transmission bands.

    摘要翻译： 光通信装置对多个信号传输频带的信号执行波分复用。 该装置包括实现分布式拉曼放大的第一光学单元，并且具有相对于至少一个信号传输频带补偿光通信装置所连接的传输路径的色散的特性。