OPTICAL SENSOR AND METHOD OF USE

  • US 20120162639A1
  • Filed: 05/27/2010
  • Published: 06/28/2012
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. An interferometer apparatus for an optical fibre system, the apparatus comprising:

  • an optical coupler having an input port and first and second ports coupled to optical fibres which define first and second optical paths;

    first and second reflectors arranged respectively in the first and second optical paths to reflect light propagating in the first and second optical paths back to the optical coupler to generate an interference signal;

    wherein the optical coupler is configured to direct first and second interference signal components respectively to first and second detector ports, and is configured to direct a third interference signal component towards the input port, and the apparatus comprises means for introducing a phase shift between the first, second and third interference signal components;

    first and second photodetectors connected to first and second detector ports of the optical coupler and configured to measure an intensity of first and second interference signal components at respective phase shifts;

    and wherein the apparatus comprises a third photodetector connected to the non-reciprocal optical device and configured to measure the intensity of the third interference signal component directed back towards the input fibre.

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