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

Volume

26

Issue

3

fYear

2014

fDate

Feb.1, 2014

Firstpage

264

Lastpage

266

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2292543

Filename

6678571