Title :
Enhancement and suppression of the thermal sensitivity of long period fiber gratings fabricated with a CO/sub 2/ laser
Author :
Kim, C.S. ; Han, Y.G. ; Kim, J.H. ; Park, H.S. ; Paek, U.C. ; Chung, Y.
Author_Institution :
Dept. of Inf. & Commun., Kwangju Inst. of Sci. & Technol., South Korea
fDate :
Aug. 30 1999-Sept. 3 1999
Abstract :
Long period fiber gratings (LPFGs) have been fabricated typically with UV-induced photosensitivity for various applications of optical fiber communication and sensors. The temperature coefficient of wavelength shift is known to be in the range of 0.05-0.15 nm//spl deg/C for conventional LPFGs. In this work, the methods of mechanical stress relaxation and periodic microbending in B/sub 2/O/sub 3/-doped fibers by a CO/sub 2/ laser are developed for fabrication of LPFGs. Doping B/sub 2/O/sub 2/ with negative temperature dependence of the refractive index (dn/dT<0) in the pure silica or the gemanosilicate glass of positive dn/dT can either enhance or suppress the temperature sensitivity of the resonance wavelength. Without using the effect of photosensitivity, thermal sensitivity can be easily controlled by adjusting the doping concentration of B/sub 2/O/sub 3/ in either the core or the cladding.
Keywords :
diffraction gratings; fibre optic sensors; optical fibre communication; optical fibre fabrication; CO/sub 2/ laser; UV-induced photosensitivity; cladding; doping concentration; long period fiber gratings; mechanical stress relaxation; optical fiber communication; optical fiber sensors; periodic microbending; photosensitivity; refractive index; temperature coefficient; temperature dependence; temperature sensitivity; thermal sensitivity; Doping; Fiber gratings; Fiber lasers; Mechanical sensors; Optical fiber communication; Optical fiber sensors; Stress; Temperature dependence; Temperature distribution; Temperature sensors;
Conference_Titel :
Lasers and Electro-Optics, 1999. CLEO/Pacific Rim '99. The Pacific Rim Conference on
Conference_Location :
Seoul, South Korea
Print_ISBN :
0-7803-5661-6
DOI :
10.1109/CLEOPR.1999.811338
