Frequency-derived distributed optical fibre sensing: signal-frequency downshifting
- 28 February 1991
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 27 (5) , 394-396
- https://doi.org/10.1049/el:19910252
Abstract
A method for downshifting the frequency of polarisation-optical time domain reflectometry signals has been demonstrated by optically mixing backscattered light from two semiconductor lasers simultaneously launched into a single mode fibre with bending birefringence. For lasers with wavelengths of 670 and 780 nm and 140 m of the fibre wound around a cylinder of radius 7.5 cm, approximately five downshifted beat cycles were obtained.Keywords
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