Patent Number: 7,043,165

Title: Multi-channel video optical transmission system, optical transmitter and optical receiver

Abstract: In a multi-channel video optical transmission system comprising an optical transmitter and an optical receiver, a frequency modulation function incorporated pilot signal generating unit is provided in the optical transmitter to generate a pilot signal frequency-modulated. This frequency-modulated pilot signal is superimposed on a multi-channel video signal inputted thereto and is converted into a frequency-modulated signal in a frequency modulator, and is transmitted through an optical fiber to an optical receiver in a state converted into an optical signal in a semiconductor laser device. In the optical receiver, the optical signal is again converted into an electric frequency-modulated signal in a light-receiving device and, after amplified in an amplifier, is demodulated in a frequency demodulator, thereby regenerating the multi-channel video signal before the input to the frequency modulator. In this configuration, the pilot signal is frequency-modulated to modulate the frequency of a distortion occurring at frequencies corresponding to the sum of or difference between the frequencies of the pilot signal and the multi-channel video signal, thus making fringe patterns on a TV monitor disappear.

Inventors: Nojima; Kazuhiro (Yokohama, JP), Kitaji; Seiho (Yokohama, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H04B 10/04 (20060101); H04B 10/08 (20060101); H04B 10/12 (20060101); H04B 17/00 (20060101)

Expiration Date: 5/09/02018