Method and apparatus for optical sensing

  • US 9,541,425 B2
  • Filed: 05/27/2010
  • Issued: 01/10/2017
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. An optical sensor system comprising:

  • a light source generating a pulsed optical signal;

    an optical modulator arranged to modulate the pulsed optical signal with a first modulation frequency (f1) and a second modulation frequency (f2) within an optical pulse modulation envelope, the modulation thereby generating frequency sidebands in the pulsed optical signal;

    an optical filter configured to controllably select a plurality of the frequency sidebands, and, thereby vary the frequency of the light output therefrom, wherein the frequency sidebands selected by the optical filter include at least a first first order sideband and a second first order sideband, respectively generated for the first modulation frequency (f1) and for the second modulation frequency (f2); and

    an optical sensing fibre configured to receive light of a frequency corresponding to the selected plurality of frequency sidebands.

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