title: Light coupling between two parallel CO2-laser written long-period fiber gratings.
abstract: We demonstrate experimentally the light coupling effects between two parallel CO(2)-laser written long-period fiber gratings. For gratings written in standard single-mode fibers, the coupling efficiency depends strongly on the fiber orientation with the strongest coupling obtained when the exposed sides of the fibers face each other, while for gratings written in boron-doped fibers, the coupling efficiency is independent of the fiber orientation. We achieve a peak coupling efficiency of approximately 86% with gratings written in boron-doped fibers by using a suitable surrounding refractive index and offset distance between the two gratings. Our results suggest the possibility of realizing efficient broadband all-fiber couplers with CO(2)-laser written long-period fiber gratings.
authors: Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China. eeyqliu@cityu.edu.hk
authors: Yunqi
authors: Y
authors: Liu
authors: Kin Seng
authors: KS
authors: Chiang
authors: Yun Jiang
authors: YJ
authors: Rao
authors: Zeng Ling
authors: ZL
authors: Ran
authors: Tao
authors: T
authors: Zhu
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D054020:Lasers, Gas; D008027:Light; D055100:Optical Fibers; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013685:Telecommunications / Q000295:instrumentation*