Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2006-05-09
2006-05-09
Li, Shi K. (Department: 2633)
Optical communications
Transmitter
Having particular modulation
C398S032000
Reexamination Certificate
active
07043165
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.
REFERENCES:
patent: 3582832 (1971-06-01), Junge et al.
patent: 5034334 (1991-07-01), Flynn et al.
patent: 6031648 (2000-02-01), Javitt et al.
patent: 6370156 (2002-04-01), Spruyt et al.
patent: 4-54034 (1992-02-01), None
patent: 4-57533 (1992-02-01), None
F. Heismann et al., “Signal Tracking and Performance Monitoring in Multi-Wavelength Optical Networks”, 22nd European Conference on Optical Communication—ECOC ' 96, 1996.
Kitaji Seiho
Nojima Kazuhiro
Connolly Bove & Lodge & Hutz LLP
Li Shi K.
Matsushita Electric - Industrial Co., Ltd.
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