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We demonstrate the extension of the measurement range of Brillouin optical time-domain analysis (BOTDA)sensors using a distributed Brillouin amplifier (DBA). The technique is based on injecting a DBA pump wave inthe fiber to generate an additional Brillouin interaction that amplifies the BOTDA pump pulses. Furthermore,the differential pulse-width pair method is used to counteract the detrimental effects of the DBA amplificationon the temporal shape of the pulses. Experimental proof-of-concept results in a 50-km fiber link demonstratefull compensation of the fiber’s attenuation with no penalty on the signal-to-noise ratio of the detected probewave.The authors acknowledge support from the Spanish Ministerio de Economa y Competitividad project TEC2013-47264-C2-2-R,FEDER funds and the Universidad Pública de Navarra

Brilloun optical time domain analysis sensor assisted by a Brillouin distributed amplifier