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Methods and systems for detecting small span loss changes in fiber optic networks

  • US 8,116,625 B2
  • Filed: 03/04/2009
  • Issued: 02/14/2012
  • Est. Priority Date: 03/04/2009
  • Status: Active Grant
First Claim
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1. A method for detecting small span loss changes in a fiber optic span, comprising:

  • sampling power measurements at a transmit point at a predetermined time;

    sampling power measurements at a receive point at the predetermined time plus a time delay, wherein the transmit point and the receive point define endpoints of the fiber optic span;

    calculating fiber span loss for the predetermined time responsive to the sampled power measurements at the transmit point and at the receive point;

    repeating the sampling steps and the calculating step; and

    integrating the calculated fiber span losses.

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