Title :
Compact Long-Period Fiber Gratings Based on Periodic Microchannels
Author :
Jing-Chun Guo ; Yong-Sen Yu ; Yang Xue ; Chao Chen ; Rui Yang ; Chuang Wang ; Qi-Dai Chen ; Hong-Bo Sun
Author_Institution :
State Key Lab. on Integrated Optoelectron., Jilin Univ., Changchun, China
Abstract :
A novel formation method of long-period fiber gratings (LPFGs) based on periodic microchannels, which are fabricated by femtosecond laser micromachining and selective chemical etching in conventional single-mode fibers, is proposed and experimentally demonstrated. This kind of grating may be as short as only 3 mm and exhibits low-temperature sensitivity of 9.95 pm/°C from 30 °C to 120°C. The strain sensitivities of the resonant wavelength and peak loss are -2.4 nm/mε and -3.5 dB/mε, respectively. High refractive-index (RI) sensitivity with one order of magnitude larger than that of the conventional LPFGs near RI=1.33 is achieved in general single-mode fibers.
Keywords :
diffraction gratings; etching; laser materials processing; micromachining; optical fibre fabrication; refractive index; femtosecond laser micromachining; long period fiber gratings; periodic microchannels; refractive index sensitivity; selective chemical etching; single mode fibers; temperature 30 degC to 120 degC; Etching; Fiber lasers; Microchannel; Optical fiber sensors; Optical fibers; Sensitivity; Temperature sensors; Femtosecond laser; fiber sensor; long-period fiber gratings (LPFGs); microchannels;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2227701
