Open AccessLight coupling between two parallel CO_2-laser written long-period fiber gratings
Author(s) -
Yunqi Liu,
Kin Seng Chiang,
Yu Rao,
Zeng Ling Ran,
Zhu Tao
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.017645
Subject(s) - materials science , optics , graded index fiber , fiber laser , phosfos , long period fiber grating , photonic crystal fiber , fiber bragg grating , optical fiber , polarization maintaining optical fiber , optoelectronics , coupling (piping) , laser , dispersion shifted fiber , fiber optic sensor , wavelength , physics , composite material
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.