Title :
Composite Structure Distributed Bragg Reflector Fiber Laser for Simultaneous Two-Parameter Sensing
Author :
Wong, Allan C L ; Chung, W.H. ; Lu, Chao ; Tam, Hwa-Yaw
Author_Institution :
Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ., Kowloon, China
Abstract :
We propose and demonstrate using a single composite structure distributed Bragg reflector fiber laser (DBR-FL) for simultaneous sensing of refractive index (RI) and temperature. The FL structure consists of a pair of uniform fiber Bragg gratings (FBGs) forming the laser cavity. A variable cavity attenuator made by a blazed FBG (BFBG) is written inside the cavity, which varies the optical loss upon changes in the surrounding RI. Simultaneous sensing is realized from the fact that the output power only varies with the surrounding RI, whereas the lasing wavelength with the temperature. The sensitivity of RI measurement of the proposed FL improved by several times in comparison with the passive BFBG sensor.
Keywords :
Bragg gratings; distributed Bragg reflector lasers; fibre lasers; fibre optic sensors; refractive index; blazed FBG; composite structure distributed Bragg reflector fiber laser; laser cavity; optical loss; refractive index sensing; simultaneous two-parameter sensing; temperature sensing; uniform fiber Bragg gratings; variable cavity attenuator; Bragg gratings; Cavity resonators; Distributed Bragg reflectors; Fiber gratings; Fiber lasers; Optical attenuators; Optical fiber sensors; Optical refraction; Optical sensors; Optical variables control; Refractive index; Sensitivity; Temperature measurement; Temperature sensors; Wavelength measurement; Composite structure distributed Bragg reflector fiber laser (DBR-FL); fiber laser sensor; refractive index (RI); simultaneous two-parameter sensing; temperature;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2062500
