Title :
CO2-Laser-Induced Long Period Fiber Gratings in Few Mode Fibers
Author :
Biao Wang ; Weigang Zhang ; Zhiyong Bai ; Li Wang ; Liyu Zhang ; Quan Zhou ; Lei Chen ; Tieyi Yan
Author_Institution :
Key Lab. of Opt. Inf. Sci. & Technol., Nankai Univ., Tianjin, China
Abstract :
A novel long period fiber grating (LPFG) is inscribed in few mode fibers by CO2-laser-irradiation method. The experiment results and theoretical calculation demonstrate that the LPFGs are originated from the strong coupling between the fundamental core mode LP01 and the high-order core mode LP11. The resonant wavelength is found to shift toward the lower wavelength with temperature or force increasing, which is quite different from LPFGs fabricated in common single mode fibers. The gratings are quite sensitive to strain and slightly insensitive to temperature. Such structures are easy to be fabricate and can be promising candidates as strain sensors.
Keywords :
fibre optic sensors; laser materials processing; optical fibre couplers; optical fibre fabrication; optical resonators; strain sensors; carbon dioxide-laser-induced long period fiber gratings; carbon dioxide-laser-irradiation method; few mode fibers; optical coupling; resonant wavelength shift; strain sensors; Fiber gratings; Optical fiber communication; Optical fiber dispersion; Optical fiber sensors; Strain; Temperature sensors; Long period fiber grating; few mode fiber; long period fiber grating; strain sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2363478
