Open AccessFabrication of long-period fiber gratings using end-coupled ultrafast laser pulses
Author(s) -
Masao Yonemura,
Kazuo Hasegawa
Publication year - 2017
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.25.011340
Subject(s) - materials science , optics , long period fiber grating , graded index fiber , ultrashort pulse , refractive index , optical fiber , fiber laser , fiber bragg grating , laser , fabrication , fiber , dispersion shifted fiber , optoelectronics , diffraction grating , fiber optic sensor , grating , physics , medicine , alternative medicine , pathology , composite material
We propose a novel technique for the fabrication of long-period fiber gratings (LPFGs) using ultrafast laser pulses coupled into opposite ends of an optical fiber. The pulses counter-propagate in the fiber and induce a permanent refractive index change where they overlap. Based on absorption rate measurements, it was confirmed that the pulses were partially absorbed at the overlapping position, with a maximum absorption rate of 6%. Furthermore, a LPFG with a smooth transmission spectrum and low background loss was successfully fabricated using this technique.