Reflective Optical Fiber Refractometer Based on Long-Period Grating Tailored Active Bragg Grating

Author

Yebin Zhang ; Guofeng Yan ; Bin Zhou ; El-Hang Lee ; Sailing He

Author_Institution

Dept. of Opt. Eng., Zhejiang Univ., Hangzhou, China

Volume

27

Issue

11

fYear

2015

fDate

June1, 1 2015

Firstpage

1173

Lastpage

1176

Abstract

A reflective optical fiber refractometer based on a long-period grating (LPG) followed by an active fiber Bragg grating (AFBG) is proposed. The AFBG is inscribed in a short section of cobalt-doped optical fiber, which can be heated by pump laser and acts as a sensing signal indicator. The LPG functions as a bridge between the surrounding refractive index (RI) and the AFBG reflection, tailoring the power of pump laser for heating. Experimental results demonstrate that the wavelength response of this fiber grating-based reflective refractometer can be easily adjusted, and a significantly improved sensitivity within the RI range from 1.3403 to 1.4654 has been achieved.

Keywords

Bragg gratings; cobalt; fibre optic sensors; optical pumping; refractive index; refractive index measurement; refractometers; thermo-optical effects; AFBG reflection; LPG; cobalt-doped optical fiber; long-period grating tailored active fiber Bragg grating; pump laser heating; reflective optical fiber refractometer; refractive index; sensing signal indicator; Fiber gratings; Laser excitation; Optical fiber sensors; Optical fibers; Sensitivity; Reflective optical fiber refractometer; active Bragg grating; long-period grating;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2414351

Filename

7066926