Author(s): Lv, B (Lv, Bing); Zhang, WT (Zhang, Wentao); Huang, WZ (Huang, Wenzhu); Li, F (Li, Fang)

Source: IEEE PHOTONICS TECHNOLOGY LETTERS Volume: 35 Issue: 3 Pages: 152-155 DOI: 10.1109/LPT.2022.3227221 Published: FEB 1 2023

Abstract: A high-resolution optic fiber dynamic strain sensor based on a two-cavity fiber Bragg grating Fabry-Perot (FBG-FP) interferometer and random fiber laser (RFL) is demonstrated. The specially designed two-cavity FBG-FP interferometer acts as a sensing element and can effectively suppress the competition-induced multi-spike lasing modes and frequency jitter, which contributes to establish single-wavelength laser and suppress frequency noise of RFL. The frequency noise is reduced from about 12 to 3 Hz/root Hz above 4 kHz. An ultrahigh dynamic-strain detecting resolution of 30 femto-strain (fe)/root Hz is achieved. To the best of our knowledge, it is the first time that two-cavity FBG-FP interferometer has been used in sensing field.

Accession Number: WOS:000902080800002

ISSN: 1041-1135

eISSN: 1941-0174

Full Text: https://ieeexplore.ieee.org/document/9970730