Forward-Scatter Distributed Optical-Fibre Sensing Using Non-Linear Interactions

A. J. Rogers

doi:10.1117/12.960994

29 October 1989 Forward-Scatter Distributed Optical-Fibre Sensing Using Non-Linear Interactions

A. J. Rogers

Proceedings Volume 1120, Fibre Optics '89; (1989) https://doi.org/10.1117/12.960994
Event: Sira/Fibre Optics '89, 1989, London, United Kingdom

Abstract

The advantages offered by optical-fibre sensors are well known. Distributed optical-fibre sensors utilise the one-dimensional nature of an optical fibre to offer the additional advantage of the determination of the distribution of the measurand along the path of the fibre, with a spatial resolution 0.1-10m, depending on the system and the application. Most distributed optical-fibre measurement systems which have been studied hitherto have relied on time-domain backscatter (OTDR) techniques. In these, the spatial information is obtained via time resolution of the light backscattered from a pulse propagating in the fibre. These techniques suffer from the fact that backscattered light levels are low; thus signal detection and signal processing become problematic. An alternative approach is to extract the information from forward-scattered light by allowing counter-propagating light waves to interact non-linearly in the fibre. Detected signal levels then become some three orders of magnitude higher. The paper investigates this alternative approach.

Citation Download Citation

A. J. Rogers "Forward-Scatter Distributed Optical-Fibre Sensing Using Non-Linear Interactions", Proc. SPIE 1120, Fibre Optics '89, (29 October 1989); https://doi.org/10.1117/12.960994

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