Abstract

Stimulated Brillouin scattering and the longitudinal strain performance based on Brillouin Optical Time Domain Analysis (BOTDA) in a 50 cm long nonuniform As $_{2}$ Se $_{3}$ -PMMA tapered fiber is theoretically and experimentally investigated. In the BOTDA measurement a 20 ns pump pulse is used, of which the pulse-width equivalent length is longer than the fiber under test (FUT) of 50 cm nonuniform As $_{2}$ Se $_{3}$ -PMMA tapered fiber. The evolution of Brillouin gain spectrum (BGS) corresponding to different fiber sections is analyzed showing the strain performance of the shift of the BGS frequency and the change of BGS linewidth under the imposed longitudinal strain. A strain-insensitive BGS linewidth is achieved by selecting the fiber gain section under the combined effects of the longitudinal acoustic velocity $V_{A}$ , strain dependence of refractive index $n$ , the effective fiber length $L_{eff}$ and also the pump intensity $I$ along the nonuniform As $_{2}$ Se $_{3}$ -PMMA tapered fiber. The proposed method has the potential for many novel applications such as strain-insensitive sensing device, multiple-parameter sensors and the distributed sensing measurement along the nonuniform As $_{2}$ Se $_{3}$ -PMMA tapered fibers.

Monitoring local temperature and longitudinal strain along a nonuniform As₂Se₃-PMMA tapered fiber by Brillouin gain-profile tracing

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Opt. Express 30(16) 29655-29664 (2022)

Stimulated Brillouin scattering in a tapered dual-core As₂Se₃-PMMA fiber for simultaneous temperature and strain sensing

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Opt. Lett. 45(12) 3301-3304 (2020)

Simultaneous generation of guided-acoustic-wave Brillouin scattering and stimulated-Brillouin-scattering in hybrid As₂Se₃-PMMA microtapers

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Opt. Express 27(10) 13734-13743 (2019)

Wide-range strain sensor based on Brillouin frequency and linewidth in an As₂Se₃-PMMA hybrid microfiber

Haiyang Wang, Song Gao, Chams Baker, Yuan Wang, Liang Chen, and Xiaoyi Bao
Opt. Express 28(15) 22933-22945 (2020)

Approach for temperature-insensitive strain measurement using a dual-core As₂Se₃-PMMA taper

Song Gao, Chams Baker, Liang Chen, and Xiaoyi Bao
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