Open AccessSingle hole twin eccentric core fiber sensor based on anti-resonant effect combined with inline Mach-Zehnder interferometer
Author(s) -
Wenjun Ni,
Ping Lü,
Jiangshan Zhang,
Chao Yang,
Xin Fu,
Yuan Sun,
Hao Liao,
Deming Liu
Publication year - 2017
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.25.012372
Subject(s) - optics , interference (communication) , mach–zehnder interferometer , sensitivity (control systems) , interferometry , demodulation , curvature , materials science , fiber optic sensor , core (optical fiber) , physics , optical fiber , telecommunications , electronic engineering , channel (broadcasting) , geometry , mathematics , computer science , engineering
A novel fiber curvature sensor without temperature cross interference based on a single hole twin eccentric core fiber has been proposed. Anti-resonant mechanism combined with inline Mach-Zehnder interference (MZI) structure are applied to the measurands detection. The spectrum is composed of a comb spectrum caused by the inline MZI and several dominant resonant wavelengths induced by anti-resonant effect. The curvature sensitivity of -1.54dB/m -1 can be achieved by intensity demodulation of the selected dip of Gaussian fitting. Similarly, the temperature sensitivity of 70.71pm/°C and 34.17pm/°C are respectively achieved by tracking coherent decrease point obtained by the FFT band pass filter method and Gaussian fit dip. Consequently, a relatively higher resolution of temperature measurement can be realized by the two methods mentioned above. The proposed sensor has a great potential for structural health monitoring, such as buildings, towers, bridges, and many other infrastructures due to its compact structure, easy fabrication and without cross impacts.