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

  • US 20060002650A1
  • Filed: 05/26/2005
  • Published: 01/05/2006
  • 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 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 mode field power distribution in the cable;

    capturing a portion of higher order signal modes arriving at a distal end of the cable to provide a sample signal;

    monitoring the sample signal for transient changes in the mode field power distribution that are characteristic of cable handling; and

    activating an alarm in response to detection of said changes.

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