Reflective Optical Fiber Sensors Based on Tilted Fiber Bragg Gratings Fabricated With Femtosecond Laser

Author

Chao Chen ; Yong-Sen Yu ; Rui Yang ; Chuang Wang ; Jing-Chun Guo ; Yang Xue ; Qi-Dai Chen ; Hong-Bo Sun

Author_Institution

State Key Lab. on Integrated Optoelectron., Jilin Univ., Changchun, China

Volume

31

Issue

3

fYear

2013

fDate

Feb.1, 2013

Firstpage

455

Lastpage

460

Abstract

The fabrication of tilted fiber Bragg gratings (TFBGs) in non-photosensitized single-mode fiber by infrared femtosecond (fs) laser is reported for the first time to the best of our knowledge. The tilted grating structure is obtained by focusing laser pulses through a phase mask into a tilted positioned fiber sample, which is moving along with the interference fringe to form a grating region covering the entire fiber core and partial cladding. A reflective fiber probe based on the TFBG with a gold mirror sputtered on one end has been fabricated and its maximum refractive index (RI) sensitivity is 12.276 nm/RI unit in the RI range of 1.4091-1.4230 for the cladding mode LP020. A wavelength-power demodulated technique based on the sensors has been proposed to measure axial strain and temperature simultaneously, which is found suited to work in harsh environment, especially at high temperature up to 800°C.

Keywords

Bragg gratings; fibre optic sensors; optical fibre cladding; optical fibre fabrication; optical focusing; refractive index; axial strain measurement; fiber core; infrared femtosecond laser; interference fringe; laser pulses focusing; non-photosensitized single-mode fiber; phase mask; reflective fiber probe; reflective optical fiber sensors; refractive index; temperature measurement; tilted fiber bragg gratings; wavelength-power demodulated technique; Fiber gratings; Optical fiber sensors; Optical fibers; Strain; Temperature measurement; Temperature sensors; Femtosecond (fs) laser; optical fiber sensors; tilted fiber Bragg gratings (TFBGs);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2012.2232643

Filename

6380519