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Secure communication system

  • US 5,191,614 A
  • Filed: 11/14/1988
  • Issued: 03/02/1993
  • Est. Priority Date: 11/14/1988
  • Status: Expired due to Term
First Claim
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1. A fiber optic communication system, comprising:

  • a) a light source means for inputting a beam of light into a first optical fiber;

    b) a beamsplitting means for splitting the light beam into counterpropagating beams connected to the first optical fiber having one output connected to a detector and second and third outputs for generating clockwise and counterclockwise beams respectively;

    c) an optical fiber loop having one end connected to the second output of the beamsplitting means for receiving a light beam propagating in a clockwise direction and the other end of the optical fiber loop connected to the third output of the beamsplitting means for receiving a light beam propagating in a counterclockwise direction;

    d) a signaling means connected to the optical fiber loop for modulating an intelligence signal on the counterpropagating light beams;

    e) a random phase modulating means connected to the optical fiber loop at its midpoint for modulating a random signal on the counterpropagating light beams; and

    e) an electrical circuit means connected to the detector for demodulating the light beams detected to receive the intelligence signal.

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