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Intrusion detection system for use on an optical fiber using a translator of transmitted data for optimum monitoring conditions

  • US 7,092,586 B2
  • Filed: 05/26/2005
  • Issued: 08/15/2006
  • Est. Priority Date: 07/18/2003
  • Status: Active Grant
First Claim
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1. A method of detecting intrusion into a multimode optical fiber comprising:

  • launching a light signal into a proximal end of the optical fiber from a source of light that is offset from the center of a core of the optical fiber so as to establish a non-uniform made field power distribution in the optical fiber;

    using a tap coupler at a distal end of the optical fiber to capture a portion only of the light signal arriving at a the distal end of the cable, the portion containing only higher order signal modes;

    monitoring the portion for transient changes in the portion that are characteristic of cable handling; and

    activating an alarm in response to detection of said transient changes.

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