Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2414351
