1
Yoshinori Yokoyama, Munehisa Takeda, Hitoshi Ota, Aritomo Uemura, Tadayoshi Kitayama: Optical switching apparatus for use in an optical communication system. Mitsubishi Denki Kabushiki Kaisha, Leydig Voit & Mayer, July 25, 2000: US06094293 (70 worldwide citation)

An optical switch includes a light emitter for emitting light and light receivers. A reflector is used for changing a path of light emitted from the light emitter. The reflector is held by a permanent magnet having first and second magnetic poles of opposite polarities. A supporting member is provid ...


2
Katsuhiro Shimizu, Takashi Mizuochi, Kuniaki Motoshima, Tadayoshi Kitayama: Gain controllable optical amplifier and applications thereof. Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks, April 9, 1996: US05506724 (58 worldwide citation)

An optical fiber which amplifies an input signal by a pump source, a compensation-signal source which injects a compensation-signal propagating contra-directionally with respect to the input signal Into the optical fiber, a gain detector which measures a spontaneous emission light of the pump source ...


3
Takashi Mizuochi, Tadayoshi Kitayama: Wavelength multiplexed light transfer unit and wavelength multiplexed light transfer system. Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks P C, December 15, 1998: US05850301 (58 worldwide citation)

A branch circuit is formed by forming an optical filter by means of connecting a wavelength selective reflector to between two units of directional coupler and further assembling three units of the optical filter. In the branch circuit, the three optical filters are connected to each other so that t ...


4
Kiwami Matsushita, Takashi Mizuochi, Mayumi Miyazaki, Tadayoshi Kitayama: Optical fiber amplifier and its amplification method. Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks, December 7, 1993: US05268786 (48 worldwide citation)

A optical signal from the input terminal 6a is amplified and goes through the optical fiber doped with rare earth. The excitation lights from the excitation light sources 2 and 3 are synthesized at the optical coupler 4 and outputted to the optical fiber doped with rare earth 1 through the optical c ...


5
Katsuhiro Shimizu, Takashi Mizuochi, Takeshi Komiya, Kiwami Matsushita, Tadayoshi Kitayama, Masatoshi Suzuki, Hidenori Taga, Shu Yamamoto, Noboru Edagawa, Itsuro Morita: Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods. Mitsubishi Denki Kabushiki Kaisha, Kokusai Denshin Denwa, May 22, 2001: US06236488 (23 worldwide citation)

Detection of an optical pulse position uses an optical pulse string with a determined repetitive ratio and an electric clock signal with a same frequency as the repetitive ratio of the optical pulse string. A phase of the electric clock signal oscillator is shifted and supplied to an optical modulat ...


6
Takashi Mizuochi, Tadayoshi Kitayama, Hideaki Tanaka, Koji Goto: Dispersion compensation device. Kokusai Denshin Denwa, Mitsubishi Denki Kabushiki Kaisha, September 18, 2001: US06292603 (23 worldwide citation)

A dispersion compensation device comprises a chirped grating, and a first optical unit for guiding at least a lightwave signal with a wavelength of &lgr;


7
Takashi Mizuochi, Tadayoshi Kitayama, Katsuhiro Shimizu, Kiwami Matsushita, Nobuyuki Takemura, Eiichi Nakagawa: Optical-fiber light amplifier. Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks, October 3, 1995: US05455704 (22 worldwide citation)

An optical-fiber light amplifier using rare-earth-doped optical fibers. The light amplifier combines first and second excitation light from first and second sources to form combined excitation light and divides the combined excitation light for inverted distribution to both two optical fibers. The l ...


8
Shu Yamamoto, Hidenori Taga, Noboru Edagawa, Shigeyuki Akiba, Kuniaki Motoshima, Katsumi Takano, Tadayoshi Kitayama: Gain-controllable optical amplifier and optical gain-control method. Kokusai Denshin Denwa, Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks P C, January 20, 1998: US05710660 (20 worldwide citation)

This invention provides an optical amplifier which has low noise characteristics for a wide range of input signal electric power. The optical amplifier has a plurality of cascaded optical amplifying units, a signal level detector, and a pump-source controller. The pump-source controller changes cont ...


9
Takashi Mizuochi, Tadayoshi Kitayama: Wavelength multiplexed light transfer unit and wavelength multiplexed light transfer system. Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks P C, August 11, 1998: US05793908 (18 worldwide citation)

A branch circuit is formed by forming an optical filter by means of connecting a wavelength selective reflector to between two units of directional coupler and further assembling three units of the optical filter. In the branch circuit, the three optical filters are connected to each other so that t ...


10
Takashi Mizuochi, Tadayoshi Kitayama, Katsuhiro Shimizu, Kiwami Matsushita, Nobuyuki Takemura, Eiichi Nakagawa: Optical amplifier. Mitsubishi Denki Kabushiki Kaisha, Wolf Greenfield & Sacks, November 22, 1994: US05367587 (13 worldwide citation)

An optical-fiber light amplifier using rare-earth-doped optical fibers. The light amplifier combines first and second excitation light from first and second sources to form combined excitation light and divides the combined excitation light for inverted distribution to both two optical fibers. The l ...