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Apparatus for detecting a fault location in an optical fiber line

  • US 6,185,020 B1
  • Filed: 08/04/1997
  • Issued: 02/06/2001
  • Est. Priority Date: 08/05/1996
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting a fault location in an optical fiber line having a signal at a wavelength, comprising:

  • an optical fiber line including a reflector for reflecting a predetermined reflection wavelength which is different from the signal wavelength, said reflector being disposed at a geographically known position along said optical fiber line; and

    an optical pulse tester for transmitting a probe pulse light at said reflection wavelength on the optical fiber line, and measuring a Rayleigh back-scattered light from the optical fiber line and a Fresnel reflection light from a fault location in comparison with reflected light from said reflector to determine the position of the fault location in relation to the position of the reflector on a time base.

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