Open AccessCladding mode coupling in highly localized fiber Bragg gratings II: complete vectorial analysis
Author(s) -
Jens Thomas,
Nemanja Jovanović,
Ria G. Krämer,
Graham D. Marshall,
Michael J. Withford,
Andreas Tünnermann,
Stefan Nolte,
M. J. Steel
Publication year - 2012
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.20.021434
Subject(s) - optics , fiber bragg grating , cladding (metalworking) , cladding mode , materials science , long period fiber grating , polarization (electrochemistry) , grating , transverse plane , mode coupling , physics , graded index fiber , optical fiber , polarization maintaining optical fiber , fiber optic sensor , chemistry , structural engineering , metallurgy , engineering
Highly localized fiber Bragg gratings can be inscribed point-by-point with focused ultrashort pulses. The transverse localization of the resonant grating causes strong coupling to cladding modes of high azimuthal and radial order. In this paper, we show how the reflected cladding modes can be fully analyzed, taking their vectorial nature, orientation and degeneracies into account. The observed modes' polarization and intensity distributions are directly tied to the dispersive properties and show abrupt transitions in nature, strongly correlated with changes in the coupling strengths.