Abstract

Optomechanical time-domain analysis (OMTDA) is a novel approach to measure distributed acoustic impedance of surrounding media with a high spatial resolution based on coherent forward stimulated Brillouin scattering probing. However, the spatial resolution is still limited by the polarization noise and influence of activation pulse. In this Letter, we propose a polarization separation based OMTDA to further improve the resolution. By isolating the acoustic activation and probing process in orthogonal polarization states, the backward Brillouin scattering of an activation pulse is effectively suppressed. Accompanied with the reduced polarization fluctuation brought by polarization-maintaining fiber, a spatial resolution of 0.8 m is experimentally demonstrated over a 34-m-long fiber and the precise distinction between air and alcohol is realized.

© 2021 Optica Publishing Group

Opto-mechanical time-domain analysis based on coherent forward stimulated Brillouin scattering probing

Chao Pang, Zijie Hua, Dengwang Zhou, Hongying Zhang, Liang Chen, Xiaoyi Bao, and Yongkang Dong
Optica 7(2) 176-184 (2020)

Distributed optomechanical fiber sensing based on serrodyne analysis

Simon Zaslawski, Zhisheng Yang, and Luc Thévenaz
Optica 8(3) 388-395 (2021)

Simultaneous measurement of temperature and acoustic impedance based on forward Brillouin scattering in LEAF

Zelin Zhang, Yuangang Lu, Jianqin Peng, and Zhengyuan Ji
Opt. Lett. 46(7) 1776-1779 (2021)

Quasi-acoustic impedance matching distributed opto-mechanical sensor with aluminized coating optical fibers

Yongkang Dong, Yuli Ren, Hongwei Li, Arkady Shipulin, Dengwang Zhou, Tianfu Li, Hongying Zhang, Dianyang Lin, and Dexin Ba
Opt. Lett. 47(21) 5696-5699 (2022)

High spatial resolution fast Brillouin optical time-domain analysis enabled by frequency-agility digital optical frequency comb

Huan He, Zhiyong Zhao, Songnian Fu, Deming Liu, and Ming Tang
Opt. Lett. 47(14) 3403-3406 (2022)