Abstract

We demonstrate the enlargement of sensing range of Brillouin optical correlation domain analysis (BOCDA) system by introducing the first-order distributed Raman amplification. The time-domain data processing is adopted for the BOCDA system utilizing a gated Brillouin pump, and the Raman amplification is applied to compensate for the depletion of Brillouin pump induced by Rayleigh scattering and Brillouin interaction. The Raman pump is injected in the opposite direction to the propagation of Brillouin pump, where the pumping scheme is optimized by simulations. A differential measurement scheme is additionally introduced for improving spatial resolution and dynamic range. In experiments, we measure the strain distribution along a 52.1 km sensing fiber with 7 cm spatial resolution, where the number of resolving points of measurement is more than 744 000.

Tailored pump compensation for Brillouin optical time-domain analysis with distributed Brillouin amplification

Young Hoon Kim and Kwang Yong Song
Opt. Express 25(13) 14098-14105 (2017)

Time-gated chaotic Brillouin optical correlation domain analysis

Jianzhong Zhang, Yahui Wang, Mingjiang Zhang, Qian Zhang, Mengwen Li, Chenyu Wu, Lijun Qiao, and Yuncai Wang
Opt. Express 26(13) 17597-17607 (2018)

Distributed strain measurement with millimeter-order spatial resolution based on Brillouin optical correlation domain analysis

Kwang Yong Song, Zuyuan He, and Kazuo Hotate
Opt. Lett. 31(17) 2526-2528 (2006)

Brillouin optical correlation domain analysis with more than 1 million effective sensing points based on differential measurement

Yong Hyun Kim, Kwanil Lee, and Kwang Yong Song
Opt. Express 23(26) 33241-33248 (2015)

Optimization of long-range BOTDA sensors with high resolution using first-order bi-directional Raman amplification

Marcelo A. Soto, Gabriele Bolognini, and Fabrizio Di Pasquale
Opt. Express 19(5) 4444-4457 (2011)