DocumentCode :
1379729
Title :
Highly Sensitive Refractive Index Optical Fiber Sensors Fabricated by a Femtosecond Laser
Author :
Yang, Jinpeng ; Jiang, Lan ; Wang, Sumei ; Chen, Qianghua ; Li, Benye ; Xiao, Hai
Author_Institution :
Laser Micro/Nano Fabrication Lab., Beijing Inst. of Technol., Beijing, China
Volume :
3
Issue :
6
fYear :
2011
Firstpage :
1189
Lastpage :
1197
Abstract :
Highly sensitive and robust refractive index (RI) fiber sensors are proposed, which are based on concatenating two micro air-cavities. The micro air-cavities embedded in the fiber along the core axis are fabricated by combining the techniques of femtosecond laser micromachining and arc fusion splicing. The full-width at half-maximum (FWHM) of an attenuation peak of a sensor in air is 0.048 nm, and the extinction ratio is ~ 15 dB. When the diameter of the cavity is slightly larger than the fiber core diameter, the sensor is highly sensitive to external RI changes. A high sensitivity of 172.4 nm/refractive index unit (RIU) around the RI range of 1.333-1.365 is achieved, which is about six times higher than long-period fiber grating (LPFG)-type and taper-type RI sensors in the same RI range.
Keywords :
fibre optic sensors; high-speed optical techniques; laser beam machining; micromachining; refractive index; arc fusion splicing; attenuation peak; femtosecond laser; highly sensitive refractive index optical fiber sensors; laser micromachining; long period fiber grating; micro air cavities; refractive index unit; Cavity resonators; Fiber lasers; Optical fiber sensors; Optical fibers; Sensitivity; Fiber optics systems; sensors; ultrafast lasers;
fLanguage :
English
Journal_Title :
Photonics Journal, IEEE
Publisher :
ieee
ISSN :
1943-0655
Type :
jour
DOI :
10.1109/JPHOT.2011.2176535
Filename :
6084805
Link To Document :
بازگشت