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Apparatus and method for monitoring losses in a branched optical fibre network

  • US 5,412,464 A
  • Filed: 11/18/1992
  • Issued: 05/02/1995
  • Est. Priority Date: 04/09/1990
  • Status: Expired due to Term
First Claim
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1. A method of detecting losses in a branched optical fibre network including a first optical fibre and a plurality of second optical fibres each of which is coupled to the first optical fibre, the first optical fibre constituting a main line and the second optical fibres constituting branch lines, the method comprising the steps of:

  • launching a linearly-ramped FMCW optical carrier wave into the main line,modulating the carrier wave in each of the branch lines,passively returning the modulated signals along the branch lines to the main line, andmonitoring the main line for charges in the modulation of the returned signals, wherein the carrier wave is modulated differently in each of the branch lines.

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