Victor Company of Japan, Limited

Ntt Data Communications Systems Corporation

Systems, LLC

Nit Data Communications Victor Company of Japan

Michio Kikuta

Kazutoshi Hirohashi

Takaaki Takeda

Keishi Ushijima

Hiroshi Horii

Yoshiki Iwasaki

Shunichi Shichijo

Motoyasu Nagashima

Yoshiaki Yunoki

Hideo Koike

Manabu Sakane

Takeshi Nomoto

Akio Yoshikawa

Tetsuo Fukasawa

Susumu Katayama

Masamichi Satou

Teruhiko Shinomiya

An optical radio communication system comprising a first light transmitting system and a second light transmitting system. Each of said first and second light transmitting system comprising a transmitting means and a receiving means. Said transmitting means comprising a light emitting element positioned in a region including and surrounding a focal point of a first parabolic reflector for emitting light beams, said first parabolic reflector having an inner reflective surface for reflecting said light beams emitted from said light emitting element, and a means for driving said light emitting element with a signal to be transmitted. Said receiving means comprising a second parabolic reflector having an inner reflective surface for reflecting incident light beams, a light receiving element positioned in a region including and surrounding a focal point of said second parabolic reflector for receiving light beams reflected by said second parabolic reflector to output signals, and means for taking out information from said signals outputted from said light receiving element. In this optical radio communication system, broadband signals such as Manchester coded signals are directly transmitted on optical radio.

Optical radio transmission system and a method for adjusting optical

An optical radio system includes a host device, an end device, and a repeater. The host device and the end device communicate with each other via the repeater by use of optical radio. The repeater includes a section for receiving a first light signal from one of the host device and the end device, a section for converting the received first light signal into a first electric signal, a section for frequency-converting the first electric signal into a second electric signal, and a section for generating a second light signal in response to the second electric signal and transmitting the generated second light signal. The repeater also includes a section for demodulating one of the first electric signal and the second electric signal into a baseband signal, a section for detecting a quality of the baseband signal, and a section for enabling transmission of the second light signal only when the detected quality of the baseband signal is equal to or greater than a predetermined quality.

Optical radio repeater with signal quality detection

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Tokyo, Japan

Michio Kikuta