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Coherent optical-fibre sensors with modulated laser sources

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4 Author(s)
I. P. Giles ; University College London, Department of Electronic & Electrical Engineering, London, UK ; D. Uttam ; B. Cylshaw ; D. E. N. Davies

Coherent optical-fibre sensing based on environmentally induced phase modulation can be extremely sensitive, but interferometric detection limits dynamic range. This letter examines a separate class of applications where the very high sensitivity is not required, but where remote optical sensing of relatively large physical variations is desirable. We describe a system whereby source modulation may be used to determine the state of a remote interferometer accurately and unambiguously over phase modulations from a fraction of an optical wavelength to tens or even hundreds of wavelengths. The concept may also be utilised as the basis of a multiplexed sensor highway, and preliminary results are reported.

Published in:

Electronics Letters  (Volume:19 ,  Issue: 1 )