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Brillouin echo-distributed sensing; Brillouin optical time-domain analysis
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 pi-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
pi-phase-shifted pulse of 500 ps.