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Broadcasting systems with fibre optic transmission lines

DC
  • US 4,135,202 A
  • Filed: 03/12/1976
  • Issued: 01/16/1979
  • Est. Priority Date: 12/03/1973
  • Status: Expired due to Term
First Claim
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1. A broadcasting system conveying signals by a signal path between a central station and a plurality of subscribers, comprising in combination, a common optical fibre in said signal path carrying signals to said plurality of subscribers from said central station, said fibre extending between an electro-optical transducer at said central station producing a light beam and photo-sensitive detector means at a reception position near the subscribers station, transmission means at the central station modulating the light beam for transmission through said optical fibre, said transmission means including modulation means producing a light beam modulated by a high frequency carrier which itself is modulated with video broadcast signals, conventional television receivers at the subscriber stations responsive to receive said high frequency carrier modulated with video broadcast signals, light beam demodulation means at said reception position responsive to said photo-sensitive detector means to convert said light beam into demodulated high frequency carrier radio wave signals modulated with video broadcast signals, and means coupling said demodulated signals from said reception position to said subscriber stations in a form suitable for direct application to said conventional television receivers without further signal processing.

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