Title :
Differential Phase-Shift-Keying Technique-Based Brillouin Echo-Distributed Sensing
Author :
Lee, Min Won ; Stiller, Birgit ; Hauden, Jérôme ; Maillotte, Hervé ; Roch, Carole ; Thévenaz, Luc ; Sylvestre, Thibaut
Author_Institution :
Dept. d´´Opt. P. M. Duffieux, Univ. de Franche-Comte, Besancon, France
Abstract :
In this letter, we experimentally demonstrate Brillouin echoes-based distributed optical fiber sensing with centimeter spatial resolution. It is based on a differential phase-shift-keying technique using a single Mach-Zehnder modulator to generate a pump pulse and a π-phase-shifted pulse with an easy and accurate adjustment of delay. The results are compared to those obtained in standard Brillouin echo-distributed sensing system with two optical modulators and clearly show a resolution of 5 cm in a spliced segment between two fibers by applying a π -phase-shifted pulse of 500 ps.
Keywords :
Brillouin spectra; fibre optic sensors; optical modulation; optical phase shifters; Brillouin echo distributed sensing; Mach Zehnder modulator; centimeter spatial resolution; differential phase shift keying technique; optical modulators; phase shifted pulse; Optical pulses; Optical pumping; Optical scattering; Optical sensors; Spatial resolution; Brillouin echo-distributed sensing; Brillouin optical time-domain analysis;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2172255
