Title :
Frequency-derived distributed optical fibre sensing: signal-frequency downshifting
Author :
Handerek, V.A. ; Rogers, A.J.
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 :
backscatter; birefringence; fibre optic sensors; light polarisation; time-domain reflectometry; 140 m; 670 nm; 780 nm; POTDR; TDR; backscattered light; bending birefringence; distributed optical fibre sensing; polarisation-optical reflectometry; semiconductor lasers; signal-frequency downshifting; single mode fibre; time domain reflectometry signals;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19910252
