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37 条记录 (耗时 0.016 秒)

    Pre-emphasis method in an optical communication system
    12.
    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 amplifier and monitoring circuit
    13.
    发明公开
    Optical amplifier and monitoring circuit 有权
    OptischerVerstärkerundÜberwachungsschaltung

    公开(公告)号：EP1624596A2

    公开(公告)日：2006-02-08

    申请号：EP04028247.7

    申请日：2004-11-29

    申请人： FUJITSU LIMITED

    发明人： Onaka, Miki ,  Hayashi, Etsuko ,  Onaka, Hiroshi

    IPC分类号： H04B10/17 ,  H04B10/08

    CPC分类号： H04B10/2941 ,  H01S3/06754 ,  H01S3/1305 ,  H04B10/071 ,  H04B10/07955

    摘要： An optical amplifier of the present invention comprises: an optical amplifying circuit which amplifies a signal light; an optical reflection medium which is disposed on an optical fiber connected to the optical amplifying circuit and is capable of reflecting a noise light which exists in a predetermined wavelength range outside a signal band, among noise lights generated in said optical amplifying circuit, to radiate the reflected noise light to the outside of a core of the optical fiber; a light receiver which receives the noise light reflected to be radiated to the outside of the core of the optical fiber by the optical reflection medium, to detect the power of the noise light; and a computation circuit which computes the total power of the noise lights generated in the optical amplifying circuit based on the detection result of the light receiver. Thus, it is possible to provide at a low cost an optical amplifier provided with a monitoring function capable of detecting high accurately, with a simple optical circuit configuration, the noise light power and the like generated when the signal light is amplified.

    摘要翻译： 本发明的光放大器包括：放大信号光的光放大电路; 光反射介质，其设置在连接到光放大电路的光纤上，并且能够反射存在于所述光放大电路中产生的噪声光之中的信号频带外的预定波长范围内的噪声光，以辐射 将反射的噪声光反射到光纤的核心的外部; 光接收器，其通过光反射介质接收被辐射到光纤的芯的外部的噪声光，以检测噪声光的功率; 以及计算电路，其基于所述光接收器的检测结果来计算在所述光放大电路中产生的噪声光的总功率。 因此，可以以简单的光电路配置，在信号光被放大时产生的噪声光功率等，以低成本提供具有能够高精度地检测的监视功能的光放大器。

    Variable wavelength light source and optical amplifier using same
    14.
    发明公开
    Variable wavelength light source and optical amplifier using same 有权
    可变光源的波长和光放大器使用相同的

    公开(公告)号：EP1359686A3

    公开(公告)日：2005-12-21

    申请号：EP03002139.8

    申请日：2003-01-31

    申请人： FUJITSU LIMITED

    发明人： Onaka, Miki ,  Hayashi, Etsuko ,  Onaka, Hiroshi

    IPC分类号： H04B10/155 ,  H01S3/30 ,  H01S5/14

    CPC分类号： G02B26/0808 ,  H01S3/094096 ,  H01S3/1055 ,  H01S3/302 ,  H01S5/02284 ,  H01S5/0687 ,  H01S5/143 ,  H01S5/4012 ,  H01S5/4062 ,  H01S5/4087 ,  H04B10/506 ,  H04B10/572

    摘要： It is an object of the present invention to provide a variable wavelength light source apparatus capable of changing continuously wavelengths of a plurality of oscillation light over a wideband and an optical amplifier using the same. In order to achieve the above object, the variable wavelength light source apparatus comprises: a wavelength selection device in which a propagation direction of emitted light is changed according to a wavelength of incident light; a plurality of light sources emitting the light that has reciprocated in a gain medium with a high reflecting mirror on an end face thereof and has been amplified, to a predetermined position of the wavelength selection device at angles different from each other; an optical resonance reflection section reflecting a part of the light incident vertically out of the emitted light from the wavelength selection device to form an optical resonator configuration between the optical resonance reflection section and each of the high reflecting mirrors of the light sources to generate oscillation light; an optical coupler section coupling the oscillation light transmitted through the optical resonance reflection section in an output light path; and a drive section changing an arrangement angle of the wavelength selection device with respect to the optical resonance reflection section according to desired wavelength setting.

    Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals
    15.
    发明公开
    Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals 有权
    Verfahren und Vorrichtung zum Demultiplexen vonnichtintensitätsmoduliertenwellenlängenmultiplexierten（WDM）Signalen

    公开(公告)号：EP1548967A1

    公开(公告)日：2005-06-29

    申请号：EP05007203.2

    申请日：2002-05-09

    申请人： FUJITSU LIMITED

    发明人： Hoshida, Takeshi ,  Onaka, Hiroshi

    IPC分类号： H04J14/02 ,  H04B10/158

    CPC分类号： H04B10/69 ,  H04B10/677 ,  H04J14/02

    摘要： A method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals includes receiving a WDM signal having a plurality of non-intensity modulated optical information signals. A plurality of the non-intensity modulated optical information signals are converted to intensity modulated signals while the plurality of non-intensity modulated optical information signals are multiplexed in at least a portion of the WDM signals.

    摘要翻译： 用于解复用非强度调制波分复用（WDM）信号的方法和系统包括接收具有多个非强度调制光信息信号的WDM信号。 多个非强度调制光信息信号被转换成强度调制信号，同时多个非强度调制光信息信号在WDM信号的至少一部分被复用。

    Method and device for optical amplification and system having the device
    17.
    发明公开
    Method and device for optical amplification and system having the device 失效
    为光放大和系统的方法和装置使用这样的装置

    公开(公告)号：EP0897205A3

    公开(公告)日：2000-11-02

    申请号：EP98100013.6

    申请日：1998-01-02

    申请人： FUJITSU LIMITED

    发明人： Takeda, Miki ,  Kinoshita, Susumu ,  Onaka, Hiroshi

    IPC分类号： H01S3/06 ,  H04B10/17

    CPC分类号： H04B10/291 ,  H01S3/0078 ,  H01S3/0675 ,  H01S3/06758 ,  H01S3/094096 ,  H01S3/10015 ,  H01S3/10023 ,  H01S3/1301 ,  H01S2301/04 ,  H04B10/2912 ,  H04B10/2941 ,  H04B10/2942 ,  H04B2210/003

    摘要： A device comprising an optical amplifier including an optical amplifying medium, and first and second optical filters operatively connected to the optical amplifier to suppress the wavelength dependence of gain. The medium has an input end and an output end for an optical signal. The medium is pumped so that it provides a gain band. The gain band includes a first band giving a relatively high gain and noise figure to the optical signal and a second band giving a relatively low gain and noise figure to the optical signal. The first optical filter is connected to the input end of the medium and has characteristics such that the first optical filter suppresses the wavelength dependence of gain in the second band. The second optical filter is connected to the output end of the medium and has characteristics such that the second optical filter suppresses the wavelength dependence of gain in the first band. This configuration allows suitable suppression of the wavelength dependence of gain in each optical filter, thereby providing a low noise figure and high optical output power.

    摘要翻译： 光学放大器的一种装置，包括包括光放大介质上，并且第一和第二光学滤波器可操作地连接到光放大器来抑制增益的波长依赖性。 该介质具有输入端和输出在光信号以结束。 介质泵所以没有提供捆绑的增益。 增益带包括：第一带给出相对高的增益和噪声系数的光信号和第二带给出相对低的增益和噪声系数的光信号。 第一滤光器被连接到所述介质的输入端，并已检查特性所做的第一光学滤波器抑制所述第二带增益的波长依赖性。 所述第二滤光器被连接到所述介质的输出端，并已检查特性所做的第二光学滤波器抑制所述第一带增益的波长依赖性。 这种配置允许增益在每个滤光器的波长依赖性的合适的抑制，从而提供了低噪声指数和高输出光功率。

    Polarization diversity optical receiver for coherent optical communication
    19.
    发明公开
    Polarization diversity optical receiver for coherent optical communication 失效
    OptischerPolarisationsdiversitätsempfängerfürkohärenteoptischeÜbertragung。

    公开(公告)号：EP0329186A2

    公开(公告)日：1989-08-23

    申请号：EP89102811.0

    申请日：1989-02-17

    申请人： FUJITSU LIMITED

    发明人： Naito, Takao ,  Chikama, Terumi ,  Watanabe, Shigeki ,  Kiyonaga, Tetsuya ,  Onoda, Yoshihito ,  Kuwahara, Hideo ,  Onaka, Hiroshi ,  Miyata, Hideyuki

    IPC分类号： H04B10/148

    CPC分类号： H04B10/61 ,  H04B10/614 ,  H04B10/64

    摘要： Disclosed is a polarized wave diversity optical receiver for coherent optical communication comprising: an optic­al local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing sig­nal light and the local oscillating light to obtain two polarized components; a detecting circuit (9) for detec­ting the polarized components to output intermediate frequency signals (e S and e P ); and a frequency con­trol circuit (11) for controlling, in accordance with the intermediate frequency signals (e S and e P ), the oscillating frequency of the optical local oscillating circuit (7). To ensure that the intermediate frequency is not disappeared, the frequency control circuit (11) outputs a combined signal of a sum and a difference of said intermediate frequency signals (e S and e P ).

    摘要翻译： 公开了一种用于相干光通信的偏振波分集光接收机，包括：用于振荡局部振荡光的光学本地振荡电路（7）; 混合电路（8），用于混合信号光和本地振荡光以获得两个偏振分量; 用于检测偏振分量以输出中频信号（eS和eP）的检测电路（9）; 以及用于根据中频信号（eS和eP）控制光学本地振荡电路（7）的振荡频率的频率控制电路（11）。 为了确保中频不消失，频率控制电路（11）输出所述中频信号（eS和eP）的和和差的组合信号。