Accession Number : ADD010794

Title :   Fiber Optic System for Transmission of Video-Signals by Pulse-Frequency-Modulation.

Descriptive Note : Patent,


Personal Author(s) : Cowen,S J

Report Date : 16 Aug 1983

Pagination or Media Count : 10

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 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. (Author)

Descriptors :   *Patents, *Fiber optics transmission lines, *Frequency modulation, *Pulse frequency modulation, *Video signals, Pulse rate, Photodiodes, Optical equipment components, Avalanche diodes, Noise reduction, Low loss, Signal to noise ratio, Repetition rate, Fiber optics, Optical equipment, Optimization, Pulses, Processing, Electrooptics, Fiber optics, Broadband, Gain, Frequency

Subject Categories : Lasers and Masers
      Fiber Optics and Integrated Optics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE