Open AccessPoint-by-point written fiber-Bragg gratings and their application in complex grating designs
Author(s) -
Graham D. Marshall,
Robert J. Williams,
Nemanja Jovanović,
M. J. Steel,
Michael J. Withford
Publication year - 2010
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.18.019844
Subject(s) - optics , fiber bragg grating , grating , materials science , phosfos , blazed grating , coupled mode theory , refractive index , diffraction grating , long period fiber grating , reflection (computer programming) , optoelectronics , optical fiber , fiber optic sensor , physics , graded index fiber , computer science , programming language
The point-by-point technique of fabricating fibre-Bragg gratings using an ultrafast laser enables complete control of the position of each index modification that comprises the grating. By tailoring the local phase, amplitude and spacing of the grating's refractive index modulations it is possible to create gratings with complex transmission and reflection spectra. We report a series of grating structures that were realized by exploiting these flexibilities. Such structures include gratings with controlled bandwidth, and amplitude- and phase-modulated sampled (or superstructured) gratings. A model based on coupled-mode theory provides important insights into the manufacture of such gratings. Our approach offers a quick and easy method of producing complex, non-uniform grating structures in both fibres and other mono-mode waveguiding structures.