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Optical signal transmission network

  • US 5,491,573 A
  • Filed: 09/19/1994
  • Issued: 02/13/1996
  • Est. Priority Date: 02/07/1992
  • Status: Expired due to Term
First Claim
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1. An optical signal transmission network, comprising:

  • a main optical fibre having a plurality of branch circuits, and associated with optical time domain reflectometry (OTDR) equipment connected so as to transmit an output signal through said main fibre and said branch circuits, each said branch circuit incorporating means for modulating the state of polarization of the output signal from the OTDR equipment in a manner unique to that branch, and the OTDR equipment incorporating means for detecting the state of polarization of the returned signals for distinguishing the signals returned from the individual branch circuits.

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