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    Auxiliary-signal transmission system
    1.
    发明授权
    Auxiliary-signal transmission system 失效
    辅助信号传输系统

    公开(公告)号：US5798857A

    公开(公告)日：1998-08-25

    申请号：US786692

    申请日：1997-01-22

    申请人： Yuji Tamura ,  Hiroyuki Itou ,  Tsukasa Takahashi ,  Michikazu Shima ,  Yumiko Kawasaki ,  Kazuo Yamane

    发明人： Yuji Tamura ,  Hiroyuki Itou ,  Tsukasa Takahashi ,  Michikazu Shima ,  Yumiko Kawasaki ,  Kazuo Yamane

    IPC分类号： H04B10/077 ,  H04B10/29 ,  H04B10/291 ,  H04B10/516 ,  H04B10/61 ,  H04B10/06

    CPC分类号： H04B10/291 ,  H04B10/077 ,  H04B10/2912 ,  H04B10/2931 ,  H04B2210/078

    摘要： Spontaneous emission occurring in association with direct optical amplification using an erbium-doped optical fiber is modulated with an auxiliary signal, such as a supervisory signal, for transmission of the auxiliary signal. In a first aspect of the invention, the output of an optical amplifier is passed through a variable optical band-pass filter whose transmission characteristic is varied in accordance with the auxiliary signal, to modulate the spontaneous emission component contained in the optical amplifier output. In a second aspect of the invention, the output of the optical amplifier is separated by an optical branching device into a main optical signal and part of the spontaneous emission. The separated spontaneous emission component is modulated by being passed through a variable optical band-pass filter whose transmission characteristic is varied in accordance with the auxiliary signal, and then, the modulated spontaneous emission component is wavelength-division multiplexed with the main optical signal.

    摘要翻译： 使用掺铒光纤与直接光放大相关联发生的自发发射用辅助信号（例如监控信号）进行调制，用于传输辅助信号。 在本发明的第一方面中，光放大器的输出通过可变光带通滤波器，其传输特性根据辅助信号而变化，以调制光放大器输出中包含的自发发射分量。 在本发明的第二方面中，光放大器的输出由光分支装置分离为主光信号和部分自发发射。 分离的自发发射分量通过通过可变光带通滤波器进行调制，该可变光带通滤波器的传输特性根据辅助信号而变化，然后调制的自发发射分量与主光信号进行波分复用。

    Auxiliary-signal transmission system
    4.
    发明授权
    Auxiliary-signal transmission system 失效
    辅助信号传输系统

    公开(公告)号：US5625481A

    公开(公告)日：1997-04-29

    申请号：US388357

    申请日：1995-02-14

    申请人： Yuji Tamura ,  Hiroyuki Itou ,  Tsukasa Takahashi ,  Michikazu Shima ,  Yumiko Kawasaki ,  Kazuo Yamane

    发明人： Yuji Tamura ,  Hiroyuki Itou ,  Tsukasa Takahashi ,  Michikazu Shima ,  Yumiko Kawasaki ,  Kazuo Yamane

    IPC分类号： H04B10/077 ,  H04B10/29 ,  H04B10/291 ,  H04B10/516 ,  H04B10/61 ,  H04B10/16 ,  H01S3/00 ,  H04B10/02

    CPC分类号： H04B10/291 ,  H04B10/077 ,  H04B10/2912 ,  H04B10/2931 ,  H04B2210/078

    摘要： Spontaneous emission occurring in association with direct optical amplification using an erbium-doped optical fiber is modulated with an auxiliary signal, such as a supervisory signal, for transmission of the auxiliary signal. In a first aspect of the invention, the output of an optical amplifier is passed through a variable optical band-pass filter whose transmission characteristic is varied in accordance with the auxiliary signal, to modulate the spontaneous emission component contained in the optical amplifier output. In a second aspect of the invention, the output of the optical amplifier is separated by an optical branching device into a main optical signal and part of the spontaneous emission. The separated spontaneous emission component is modulated by being passed through a variable optical band-pass filter whose transmission characteristic is varied in accordance with the auxiliary signal, and then, the modulated spontaneous emission component is wavelength-division multiplexed with the main optical signal.

    摘要翻译： 使用掺铒光纤与直接光放大相关联发生的自发发射用辅助信号（例如监控信号）进行调制，用于传输辅助信号。 在本发明的第一方面中，光放大器的输出通过可变光带通滤波器，其传输特性根据辅助信号而变化，以调制光放大器输出中包含的自发发射分量。 在本发明的第二方面中，光放大器的输出由光分支装置分离为主光信号和部分自发发射。 分离的自发发射分量通过通过可变光带通滤波器进行调制，该可变光带通滤波器的传输特性根据辅助信号而变化，然后调制的自发发射分量与主光信号进行波分复用。

    Optical transmission system and dispersion compensator
    7.
    发明授权
    Optical transmission system and dispersion compensator 失效
    光传输系统和色散补偿器

    公开(公告)号：US06823141B2

    公开(公告)日：2004-11-23

    申请号：US09749774

    申请日：2000-12-28

    申请人： Akira Miyauchi ,  Kazuo Yamane ,  Yumiko Kawasaki ,  Satoru Okano

    发明人： Akira Miyauchi ,  Kazuo Yamane ,  Yumiko Kawasaki ,  Satoru Okano

    IPC分类号： H04B1000

    CPC分类号： H04B10/25137 ,  H04B10/25133 ,  H04B2210/252

    摘要： In an optical transmission system comprising a transmitter, a receiver, and a transmission line that connects the transmitter and the receiver, a dispersion compensator is disposed in the receiver. The transmitter comprises an E/O (electro-optical signal converter) and a post-amplifier. An optical signal that has been RZ-coded is supplied to the E/O. The transmitter pre-chirps the optical signal. The pre-chirp is performed by red-chirp of which the value of the chirping parameter &agr; is positive. When the pre-chirp is performed, the non-linear effect of the optical signal on the transmission line can be canceled. In addition, with the RZ coded signal, the inter-symbol interference can be alleviated. Thus, the total dispersion amount of the dispersion compensator can be suppressed. In addition, the power of the optical output can be increased.

    摘要翻译： 在包括发射机，接收机和连接发射机和接收机的传输线的光传输系统中，在接收机中设置色散补偿器。 发射机包括E / O（电光信号转换器）和后置放大器。 经RZ编码的光信号被提供给E / O。 发射机预啁啾光信号。 前线啁啾由啁啾声执行，啁啾参数α的值为正。 当进行前啁啾时，可以消除光信号在传输线上的非线性效应。 另外，利用RZ编码信号，可以减轻符号间干扰。 因此，可以抑制色散补偿器的总色散量。 此外，可以增加光输出的功率。

    Method for optical fiber communication, and terminal device and system for use in carrying out the method
    8.
    发明授权
    Method for optical fiber communication, and terminal device and system for use in carrying out the method 有权
    用于光纤通信的方法，以及用于执行该方法的终端设备和系统

    公开(公告)号：US06738584B1

    公开(公告)日：2004-05-18

    申请号：US09349446

    申请日：1999-07-08

    申请人： Takashi Tsuda ,  Kazuo Yamane ,  Yumiko Kawasaki ,  Satoru Okano

    发明人： Takashi Tsuda ,  Kazuo Yamane ,  Yumiko Kawasaki ,  Satoru Okano

    IPC分类号： H04J1402

    CPC分类号： H04B10/11 ,  H04B10/2525 ,  H04B2210/252 ,  H04B2210/254

    摘要： The present invention relates to a method for optical fiber communication, and a terminal device and system for use in carrying out the method, and an object of the present invention is to compensate for chromatic dispersion and nonlinearity. A device for outputting an optical signal having a variable optical power into an optical fiber transmission line is provided. The optical signal transmitted by the transmission line is converted into an electrical signal by an optical receiver. A parameter related to waveform degradation of the electrical signal is detected by a monitor unit. A control unit controls the optical power of the optical signal to be output from the device so that the waveform degradation is improved.

    摘要翻译： 本发明涉及一种光纤通信方法，以及用于实施该方法的终端装置和系统，其目的在于补偿色散和非线性。 提供一种用于将具有可变光功率的光信号输出到光纤传输线中的装置。 由传输线传输的光信号由光接收机转换成电信号。 与电信号的波形劣化相关的参数由监视器单元检测。 控制单元控制要从设备输出的光信号的光功率，从而提高波形劣化。

    Optical transmission device and optical communication system
    9.
    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

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

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

    IPC分类号： H04J1402

    CPC分类号： H04B10/2942 ,  H04B10/077 ,  H04B10/07955 ,  H04B10/506 ,  H04J14/0221

    摘要： 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.

    摘要翻译： 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。

    Wavelength multiplexing transmission apparatus and wavelength demultiplexing reception apparatus
    10.
    发明授权
    Wavelength multiplexing transmission apparatus and wavelength demultiplexing reception apparatus 失效

    公开(公告)号：US07079771B2

    公开(公告)日：2006-07-18

    申请号：US10272995

    申请日：2002-10-18

    申请人： Kazuo Yamane ,  Takashi Tsuda ,  Yumiko Kawasaki ,  Satoru Okano

    发明人： Kazuo Yamane ,  Takashi Tsuda ,  Yumiko Kawasaki ,  Satoru Okano

    IPC分类号： H04J14/02 ,  H04B10/04 ,  H01S3/00

    CPC分类号： H04J14/02 ,  H04B10/506 ,  H04B10/564 ,  H04B10/572

    摘要： The invention provides a wavelength multiplexing transmission apparatus includes a plurality of optical signal outputting sections for outputting optical signals having different wavelengths from each other, and a wavelength multiplexing section for wavelength multiplexing the optical signals outputted from the optical signal outputting sections and sending out a resulting optical signal. Each of the optical signal outputting sections includes a transmission light source driven by an electric signal for outputting an optical signal of a predetermined wavelength, and a wavelength filter capable of passing therethrough and sending out only an optical signal of the predetermined wavelength to be outputted from the transmission light source to prevent a wavelength drift of the optical signal outputted from the transmission light source. A variation of the wavelength of the transmission light source is detected, and the transmission light source is shut down in order to prevent otherwise possible crosstalk with another channel and prevent a further influence of the same.