A theoretical and experimental study has been carried out on a tunable dual pump-probe optical source for distributed Brillouin optical time-domain analysis (BOTDA). The developed source exploits a modified Brillouin ring laser technology and is capable of a tuning range of∼ 200 MHz without using phase-locked loop or optical sideband generation techniques, and exhibits a linewidth smaller than 2.5 MHz and∼ 0.5 mW power. In BOTDA experiments, the proposed source has demonstrated to be an efficient solution enabling distributed sensing over 10 km single mode fiber with a spatial resolution of∼ 4 m, and a strain and temperature resolutions of∼ 10 με and∼ 0.5° C respectively.
15 Feb 2018
Volume: 36 Issue: 4 Pages: 1131-1137
Journal of Lightwave Technology