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Differential Phase-Shift-Keying Technique-Based Brillouin Echo-Distributed Sensing

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7 Author(s)
Min Won Lee ; Département d'optique P. M. Duffieux, Institut FEMTO-ST, Université de Franche-Comté, BESANÇON cedex, France ; Birgit Stiller ; Jérôme Hauden ; Hervé Maillotte
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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.

Published in:

IEEE Photonics Technology Letters  (Volume:24 ,  Issue: 1 )