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Fiber‐optic sensing scheme based on high‐order Stimulated Brillouin scattering in a fiber ring and frequency down‐conversion
Author(s) -
Yun Jin,
Cai Xun,
Xiang Zhuowei,
Chen Xinying,
Fu Hongyan
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32523
Subject(s) - brillouin scattering , beat (acoustics) , optical fiber , optics , brillouin zone , materials science , fiber optic sensor , distributed acoustic sensing , signal (programming language) , physics , computer science , programming language
In this article, a fiber‐optic sensing scheme based on Stimulated Brillouin scattering effect in a recirculating fiber ring and frequency down‐conversion is proposed and experimentally demonstrated. By employing the recirculating fiber ring structure, high‐order backscattering Stocks light has been generated. The Brillouin frequency shift will be affected by the environmental variations, such as, temperature changes, and by measuring the frequency shift of the beat signal of the pump light and the backscattering Stocks light, the measurands can be demodulated. Measuring beat frequency of higher‐order light enjoys higher sensitivity. To facilitate the measurement, frequency down‐conversion has been utilized. Temperature sensing has been demonstrated for verification in the experiment, and by detecting the frequency shift of down‐converted signal of the first‐order, second‐order, and third‐order Brillouin beat signal at ~0.5, ~1.0, and ~1.5 GHz, the sensitivities of ~1.11, ~2.41, and ~3.59 MHz/°C have been obtained, respectively.