Open AccessExperimental and numerical investigation on hollow core photonic crystal fiber based bending sensor
Author(s) -
Yu Zheng,
Perry Ping Shum,
Shuhui Liu,
Boyao Li,
Yang Xiang,
Yiyang Luo,
Yanan Zhang,
Wenjun Ni,
Zhifang Wu,
Xuan Quyen Dinh,
Shuwen Zeng,
JeanLouis Auguste,
Georges Humbert
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.030629
Subject(s) - materials science , bending , photonic crystal fiber , optics , core (optical fiber) , sensitivity (control systems) , optical fiber , fiber , fiber optic sensor , optoelectronics , composite material , electronic engineering , physics , engineering
Recent progress in designing optimized microstructured optical fiber spreads an application scenario of optical fiber sensing. Here, we investigate the bending measurement based on a specially designed hollow core photonic crystal fiber (HC-PCF). Numerical simulation indicates that the bending sensitivity is mainly determined by the diameter of the hollow core and also depends on the coupled modes. Experimentally, a direction-independent bending sensor is fabricated by sandwiching a segment of specially designed HC-PCF into two segments of single mode fibers. The bending sensitivity of our device is improved 10 times by increasing the diameter of the hollow core. Bending measurement is validated at two orthogonal planes. The maximum sensitivity up to 2.8 nm/deg is obtained at 14° bending angle. Additionally, a low thermal sensitivity of 2.5 pm/°C is observed from 18°C to 1000°C. The sensor is robust, easy to fabricate and cost effective, which is promising in the field of small-angle bending measurement under a large temperature range.