Lee, Min WonStiller, BirgitHauden, JérômeMaillotte, HervéRoch, CaroleThévenaz, LucSylvestre, Thibaut2012-01-092012-01-092012-01-09201210.1109/LPT.2011.2172255https://infoscience.epfl.ch/handle/20.500.14299/76427WOS:000298324700001In 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.Brillouin echo-distributed sensingBrillouin optical time-domain analysisSpatial-ResolutionDomain AnalysisFiber SensorBotdaRangeTemperaturetext::journal::journal article::research article