High-Sensitivity Bending Sensor Based on Supermode Interference in Coupled Four-Core Sapphire-Derived Fiber

• DOI: 10.1109/jlt.2021.3050933
• Publication Date: 2021-01-13T19:36:14Z
• Authors: Zhifeng Wang; Liang Zhang; Zhangwei Ma; Zhenyi Chen; Tingyun Wang; Fufei Pang
• Keywords: 0103 physical sciences; 01 natural sciences

A Mach-Zehnder interferometer (MZI) sensor based on a four-core sapphire-derived fiber (FSDF) for bending sensing is proposed and demonstrated. The MZI formed by splicing coupled FSDF between two single-mode fibers, delivering supermode interference among four LP01-like supermodes (LP01s modes) eight LP11-like (LP11s modes). Benefiting from the different response of field distribution each to curvature changes, sensors with variety properties can be fabricated in FSDF. experimental results show that sensitivity FSDF-MZI I LP01s LP11s modes about 4.5 dB/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> range 0.4 2.5 m . II realize ± Y directions. -10.0-5.0 -24.526 nm/m It suggests has potential application structure health detection.