Mariñelarena Ollacarizqueta, JonUrricelqui Polvorinos, JavierLoayssa Lara, Alayn2016-11-072016-11-072016Jon Mariñelarena ; Javier Urricelqui and Alayn Loayssa "Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991636 (May 30, 2016)0277-786X (Print)1996-756X (Electronic)10.1117/12.2236931https://academica-e.unavarra.es/handle/2454/22582We report on the effects of large pump pulse powers on Brillouin optical time-domain analysis (BOTDA) sensors based on phase-modulated probe wave and coherent detection. It is found that the large Brillouin gain that comes from the use of high power pulses induces a narrowing of the RF phase-shift spectrum that is measured in these sensors. This narrowing leads to a Brillouin frequency shift measurement error when the sensor is configured for dynamic measurements. However, the effect has been found to be less significant than that observed in dynamic slope-assisted BOTDA sensors based on amplitude.application/pdfengCopyright 2016 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.Brillouin scatteringBrillouin optical time-domain analysisCoherent sensorsDynamic sensinginfo:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess