Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-02-19
1983-08-16
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455617, 455611, H04B 900
Patent
active
043995640
ABSTRACT:
A fiber optic system utilizing pulse-frequency modulation (PFM) for transmission of video information signals substantially enhances the signal-to-noise ratio of the transmitted video signals. FM processing gain is realized together with system noise reduction which results from operation of the fiber optic components in a pulsed mode. The amplitude of a video signal modulates the repetition frequency of a stream of narrow light pulses emitted by a laser diode. The pulses are transmitted through a low loss, wideband optical fiber to an avalanche photodiode biased at an optimum gain point. Further improvement is possible when preemphasis processing of the video signal is performed prior to transmission.
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E. Yoneda et al., Optical Fiber Versatile Transmission Systems for Field al, Nov.-Dec. 1979, pp. 936-948, Review of the Electrical Communication Laboratories, vol. 27, No. 11-12.
Y. Ueno et al., An Optical Fiber Cable Communication System Using Pulse Interval Modulation, European Conference on Fibre Optical Communication, Sep. 16-18, 1975, pp. 156-158.
Beers Robert F.
Coles Edward L.
Griffin Robert L.
Johnston Ervin F.
Meador Terrance A.
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