Title :
In-Fiber Modal Interferometer Based on Coaxial Dual-Waveguide Fiber for Temperature Sensing
Author :
Ai Zhou ; Quan Xu ; Tuo Zheng ; Jun Yang ; Yuanyuan Yang ; Libo Yuan
Author_Institution :
Key Lab. of In-Fiber Integrated Opt., Harbin Eng. Univ., Harbin, China
Abstract :
An in-fiber modal interferometer based on coaxial dual-waveguide optical fiber was demonstrated for temperature sensing. The modal interferometer is composed of a coaxial fiber, which is sandwiched in between two single mode fibers with small lateral core-offsets. Such a modal interferometer is insensitive to external refractive index (RI) and can work when the surrounding RI is larger than the RI of the fiber cladding. It has high temperature sensitivity of 78 pm/°C and low cross-sensitivity to strain of 0.004 °C/με.
Keywords :
fibre optic sensors; light interferometers; optical waveguides; refractive index; temperature sensors; coaxial dual-waveguide fiber; external refractive index; fiber cladding; high temperature sensitivity; in-fiber modal interferometer; low strain cross-sensitivity; single mode fibers; small lateral core-offsets; temperature sensing; Interference; Optical fiber sensors; Optical interferometry; Sensitivity; Temperature measurement; Temperature sensors; Optical fiber sensors; modal interferometers; refractive index; strain; temperature;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2292543
