Differential pulse-width pair brillouin optical time-domain analysis employing raman amplification and optical pulse coding

We report on an advanced optical fiber sensing implementation enabling submeter resolution over long distance exploiting Brillouin optical time-domain analysis with differential pulse-width pair. Long sensing distances have been attained thanks to the combined use of distributed Raman amplification of optical signals together with optical pulse coding. We experimentally demonstrate strain-temperature sensing capabilities with a spatial resolution better than 50 cm throughout 93 km standard single-mode fiber, attaining accuracy in terms of measured strain and temperature smaller than 1.7 C and 34 ??, respectively. © 2014 Springer International Publishing Switzerland.