In:
Optics Letters, Optica Publishing Group, Vol. 47, No. 7 ( 2022-04-01), p. 1717-
Abstract:
In recent years, optical fiber distributed vibration sensors (DVSs) have received extensive investigation and play a significant role in different applications, such as structural health monitoring. In this Letter, we propose for the first time, to the best of our knowledge, a DVS mechanism based on linearly polarized mode coupling in weakly coupled few-mode fibers (FMFs), in which dynamic transverse stress induced by external vibration is measured with quantifiable and spatially resolvable mode coupling along the sensing FMF with ultralow inherent modal crosstalk. A swept-wavelength interferometer method is implemented and the involved data processing method is designed. A proof-of-concept DVS system is established and 5 Hz to 49 kHz frequency response, –50 dB detection sensitivity, and 22 m spatial resolution are successfully demonstrated based on a 9.6 km weakly coupled two-mode fiber. The wide frequency response over a long sensing length for the proposed scheme may extend the application range of DVS systems.
Type of Medium:
Online Resource
ISSN:
0146-9592
,
1539-4794
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2022
detail.hit.zdb_id:
243290-0
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