Title :
Compact Long Period Fiber Grating Based on Periodic Micro-Core-Offset
Author :
Zhiyong Bai ; Weigang Zhang ; Shecheng Gao ; Pengcheng Geng ; Hao Zhang ; Jieliang Li ; Fang Liu
Author_Institution :
Key Lab. of Opt. Inf. Sci. & Technol., Nankai Univ., Tianjin, China
Abstract :
A novel long period fiber grating (LPFG) fabrication method has been proposed and experimentally demonstrated. This method is based on periodically arranging micro-core-offsets (MCOs) along an optical fiber. The MCO is formed by splicing two fiber ends with a purposed lateral offset, which results in a strong refractive index modulation by changing the fiber geometry. The lateral offset value of the MCO can be adjusted to control the coupling constant and grating length. With a lateral offset value of 3.5 μm, a very short MCO-LPFG with a length of 1.09 mm can be formed by only three MCOs. Several MCO-LPFGs with different parameters have been fabricated and the sensing characteristics of the MCO-LPFGs have been discussed as well.
Keywords :
diffraction gratings; fibre optic sensors; micro-optics; optical fibre fabrication; optical modulation; refractive index; splicing; compact long period fiber grating fabrication; coupling constant; fiber geometry; grating length; optical fiber; optical splicing; periodic microcore-offset; sensing characteristics; size 1.09 mm; strong refractive index modulation; Fiber gratings; Fiber lasers; Gratings; Modulation; Optical fiber communication; Optical fiber sensors; Cleaving-splicing method; long period fiber grating; micro-core-offset; optical fiber sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2281735
