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45 条记录 (耗时 0.014 秒)

    Optical transmitter and optical transmission system
    5.
    发明公开
    Optical transmitter and optical transmission system 审中-公开
    光发射机和光传输系统

    公开(公告)号：EP1011218A3

    公开(公告)日：2004-01-14

    申请号：EP99119178.4

    申请日：1999-10-06

    申请人： FUJITSU LIMITED

    发明人： Akiyama, Yuichi ,  Ishikawa, George ,  Ooi, Hiroki ,  Chikama, Terumi

    IPC分类号： H04B10/18

    CPC分类号： H04J14/02 ,  H04B10/2513 ,  H04B2210/254 ,  H04J14/0221

    摘要： An optical transmitter having a function which compensates for wavelength dispersion is provided with a plurality of light sources for outputting light having wavelengths that differ from one another. Before the optical transmission system begins operating, the wavelength of light output to an optical transmission line is varied by changing over the light sources in order to detect a wavelength whose transmission characteristic is optimum with regard to wavelength dispersion exhibited by this optical transmission line. During system operation, the light having the detected optimum wavelength is output to the optical transmission line.

    Polarization diversity optical receiver for coherent optical communication
    9.
    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。

    Dual balanced optical signal receiver
    10.
    发明公开
    Dual balanced optical signal receiver 失效
    双平衡光信号接收器

    公开(公告)号：EP0251062A3

    公开(公告)日：1989-07-26

    申请号：EP87108787.0

    申请日：1987-06-19

    申请人： FUJITSU LIMITED

    发明人： Kuwahara, Hideo ,  Chikama, Terumi ,  Kiyonaga, Tetsuya ,  Ohsawa, Chiaki

    IPC分类号： H04B10/00

    CPC分类号： H04B10/61 ,  H04B10/614 ,  H04B10/63 ,  H04B10/64

    摘要： An optical signal receiver comprising an optical mixing/­polarization splitting unit (l0l) for producing IF optical signals having two orthogonally polarized components, an optical signal receiving unit (l02-l05) for producing four corresponding IF electric signals, and a combining circuit (l06) for combining two IF electric signals having one polarization with the other two IF electric signals having the other polarization, suppressing fluctuation of the polarization and the intensity noise of the related local optical signal. The intensity noise suppression is also effective for IF electric signals having a higher frequen­cy range.