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Securing an optical communications network path by suppression of learned ambient disturbances

  • US 8,233,755 B2
  • Filed: 12/01/2011
  • Issued: 07/31/2012
  • Est. Priority Date: 01/12/2005
  • Status: Active Grant
First Claim
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1. A method for use with a telecommunications optical cable having a plurality of optical fibers, the method comprising:

  • transmitting into at least one of the optical fibers of the cable transmitted optical signals so as to generate received signals from light which has been transmitted along said at least one of the optical fibers in response to said transmitted optical signals;

    causing a comparison of characteristics of at least some of the received signals relative to characteristics obtained from previously received ones of the received signals to detect changes in the characteristics of the received signals relative to the previously received signals;

    filtering the received signals to filter background disturbances from the received optical signals by learning those signals which arise from background disturbances and filtering those signals out to generate filtered signals;

    from the comparison of the filtered signals, determining any changes in the characteristics.

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