Title :
Low-coherent WDM reflectometry for accurate fiber length monitoring
Author :
Hui, R. ; Thomas, J. ; Allen, C. Allen ; Fu, B. ; Gao, S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Kansas, Lawrence, KS, USA
Abstract :
A fiber-optic low-coherent reflectometer was developed to accurately monitor fiber length variation. A large length-coverage range was obtained by using a fiber Bragg grating array in a wavelength-division-multiplexing configuration. The polarization mismatch-induced signal fading was eliminated by applying a polarization spreading technique at the optical receiver and, therefore, no active polarization adjustment was necessary for long-term measurement.
Keywords :
Bragg gratings; fading; fibre optic sensors; length measurement; measurement errors; optical fibre testing; reflectometry; wavelength division multiplexing; accurate fiber length monitoring; earth movement monitoring; fiber Bragg grating array; fiber length variation; fiber-optic low-coherent reflectometer; large length coverage range; low-coherent WDM reflectometry; optical receiver; polarization mismatch-induced signal fading; polarization spreading technique; wavelength-division-multiplexing configuration; Monitoring; Optical fiber polarization; Optical fiber sensors; Optical interferometry; Optical receivers; Optical refraction; Optical sensors; Optical variables control; Reflectometry; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2002.805842
