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Frequency-scanned optical time domain reflectometry

  • US 7,859,654 B2
  • Filed: 07/17/2008
  • Issued: 12/28/2010
  • Est. Priority Date: 07/17/2008
  • Status: Active Grant
First Claim
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1. A method of determining a physical parameter associated with an optical fiber, comprising:

  • launching a plurality of interrogating pulses into the optical fiber, wherein at least a first interrogating pulse has a first optical frequency and a second interrogating pulse has a second optical frequency different than the first optical frequency;

    acquiring, for each of the plurality of interrogating pulses, time resolved Rayleigh backscatter signals at a plurality of locations along at least a portion of the length of the optical fiber;

    comparing the time resolved Rayleigh backscatter signals from the first plurality of interrogating pulses with the time resolved Rayleigh backscatter signals from the second plurality of interrogating pulses; and

    based on the comparing, determining a distribution of a first physical parameter along at least the portion of the length of the optical fiber.

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