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    • 4. 发明授权
    • Optical isolator device
    • 光隔离器
    • US5835270A
    • 1998-11-10
    • US7511
    • 1993-01-22
    • Yutaka UrinoTomoki Saito
    • Yutaka UrinoTomoki Saito
    • G02B27/28G02F1/09G02B5/30
    • G02F1/093G02F2203/06
    • An optical isolator device is provided which is free from polarization dispersion. The optical isolator device presents an optical path which is equidistant for both an ordinary ray and an extraordinary ray. The optical isolator device of the present invention comprises a first and second optical isolator, each of identical thickness and each comprising a birefringent for separating an ordinary ray and an extraordinary ray, a polarization rotator for rotating the plane of polarization of these rays and a birefringent for continuing the ordinary ray and the extraordinary ray. In an embodiment of the present invention, an optical isolator device comprises two optical isolators in series, each comprising a first birefringent element for separating an input beam into an ordinary ray and an extraordinary ray, a polarization rotor for rotating the planes of polarization of the ordinary and extraordinary rays by (2m .+-.1/2).times.90 degrees (m being an integer), and a second birefringent element for combining the extraordinary ray with the ordinary ray.
    • 提供了一种没有偏振分散的光隔离器件。 光隔离器装置呈现出等于普通光线和非凡光线的光路。 本发明的光隔离器包括第一和第二光隔离器,每个光隔离器各自具有相同的厚度,并且每个包括用于分离普通光线和非常光线的双折射器,用于旋转这些光线的偏振面的偏振旋转器和双折射 继续普通的射线和非凡的射线。 在本发明的一个实施例中,光隔离器装置包括串联的两个光隔离器,每个光隔离器包括用于将输入光束分离为普通光线和非常射线的第一双折射元件,用于旋转 (2m + / - + E,fra 1/2 + EE)×90度(m为整数)的普通和非凡光线,以及用于将非常光线与普通光线组合的第二双折射元件。
    • 5. 发明授权
    • Optical communication transmission system
    • 光通信传输系统
    • US5675429A
    • 1997-10-07
    • US452728
    • 1995-05-30
    • Naoya HenmiShogo NakayaTomoki Saito
    • Naoya HenmiShogo NakayaTomoki Saito
    • G02B6/34H04B10/2513H04B10/2525H04B10/293H04B10/16H04B10/02
    • G02B6/29377H04B10/25133H04B10/25253H04B10/2935
    • An optical communication transmission system including an optical amplifier lumped repeater system of the present invention includes, for the purpose of preventing degradation of the transmission characteristic arising from wavelength dispersion of optical fibers due to raised power of the optical signal, transmission optical fibers provided for all or most of the repeating sections and having wavelength dispersion values set to different values from zero, and optical fibers provided for the individual sections to compensate for the sum of wavelength dispersion of the sections so as to reduce the total wavelength dispersion to zero. The optical fiber for compensation for each section may be replaced by a substitutive compensation element. Alternatively, very small wavelength dispersion which remains due to failure in compensating to zero dispersion may be compensated for using a dispersion equalizer of an electric system in the reception section.
    • 包括本发明的光放大器集总中继器系统的光通信传输系统包括为了防止由于光信号的提高功率而导致的光纤的波长色散引起的传输特性的劣化,为全部提供的传输光纤 或大部分重复部分,并且将波长色散值设定为与零不同的值,以及为每个部分提供的光纤以补偿部分的波长色散之和,以将总波长色散减小至零。 用于每个部分的补偿的光纤可以由替代补偿元件代替。 或者,可以使用接收部分中的电气系统的色散均衡器来补偿由于补偿零色散失败而保留的非常小的波长色散。
    • 8. 再颁专利
    • Optical communication transmission system
    • 光通信传输系统
    • USRE37621E1
    • 2002-04-02
    • US09413827
    • 1999-10-06
    • Naoya HenmiShogo NakayaTomoki Saito
    • Naoya HenmiShogo NakayaTomoki Saito
    • H04B1016
    • G02B6/29377H04B10/25133H04B10/25253H04B10/2935
    • An optical communication transmission system including an optical amplifier lumped repeater system of the present invention includes, for the purpose of preventing degradation of the transmission characteristic arising from wavelength dispersion of optical fibers due to raised power of the optical signal, transmission optical fibers provided for all or most of the repeating sections and having wavelength dispersion values set to different values from zero, and optical fibers provided for the individual sections to compensate for the sum of wavelength dispersion of the sections so as to reduce the total wavelength dispersion to zero. The optical fiber for compensation for each section may be replaced by a substitutive compensation element. Alternatively, very small wavelength dispersion which remains due to failure in compensating to zero dispersion may be compensated for using a dispersion equalizer of an electric system in the reception section.
    • 包括本发明的光放大器集总中继器系统的光通信传输系统包括为了防止由于光信号的提高功率而导致的光纤的波长色散引起的传输特性的劣化,为全部提供的传输光纤 或大部分重复部分,并且将波长色散值设定为与零不同的值,以及为每个部分提供的光纤以补偿部分的波长色散之和,以将总波长色散减小至零。 用于每个部分的补偿的光纤可以由替代补偿元件代替。 或者,可以使用接收部分中的电气系统的色散均衡器来补偿由于补偿零色散失败而保留的非常小的波长色散。
    • 9. 发明授权
    • Apparatus for extracting an optical clock and apparatus for
demultiplexing a time-division multiplexed signal
    • 用于提取用于解复用时分多路复用信号的光时钟和装置的装置
    • US5457559A
    • 1995-10-10
    • US225589
    • 1994-04-11
    • Tomoki SaitoNaoya Henmi
    • Tomoki SaitoNaoya Henmi
    • H04B10/556H04B10/524H04B10/58H04J14/08H04L7/00H04L7/02
    • H04L7/0075H04J14/08
    • A signal light and a clock light which is generated by a clock light generator are propagated through a non-linear optical medium of, for instance, a silica based single mode optical fiber, from which the signal and clock lights and a four-wave mixing light are obtained. One light, for instance, the four-wave mixing light is extracted from the output lights of the non-linear optical medium, and a control signal which is dependent on a time-mean value in power of the extracted light is applied to a voltage controlled oscillator (VCO) for driving the clock light generator. Thus, a clock light which is locked in phase to the signal light is obtained. In case where the signal light comprises N time-division sequential lights (N=1, 2, 3, - - -), and a clock frequency of the clock light is 1/N of a clock frequency of the signal light, each one of the N time-division seaquential lights is shifted in phase or frequency by the non-linear optical medium, so that the phase or frequency shifted sequential light is switched to be demultiplexed by a switch device such as an optical coupler and a polarization beam splitter.
    • 由时钟光发生器产生的信号光和时钟光通过例如基于二氧化硅的单模光纤的非线性光学介质传播,信号和时钟发光和四波混频 获得光。 例如,从非线性光学介质的输出光提取一个光,并且将取决于提取的光的功率的时间平均值的控制信号施加到电压 控制振荡器(VCO),用于驱动时钟光发生器。 因此,获得与信号光锁相的时钟光。 在信号光包括N个时分顺序光(N = 1,2,3, - - ))的情况下,并且时钟光的时钟频率是信号光的时钟频率的1 / N, 通过非线性光学介质在相位或频率上移动N个时分海景灯,使得相位或频移顺序光被切换为由诸如光耦合器和偏振分束器之类的开关装置解复用 。