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Secure communications system

  • US 5,223,967 A
  • Filed: 06/11/1986
  • Issued: 06/29/1993
  • Est. Priority Date: 06/11/1986
  • 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 beamsplitter means for splitting the light beam into counterpropagating light beams;

    b) a detector means connected to the beamsplitter means for detecting the counterpropagating light beams;

    c) a single intrusion resistant optical fiber loop connected to one output of the beamsplitter means for receiving a light beam propagating in a clockwise direction and the other end of the optical fiber loop connected to a second output of the beamsplitter 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; and

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

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