Open AccessPolarization dependent cladding modes coupling and spectral analyses of excessively tilted fiber grating
Author(s) -
Fangcheng Shen,
Kaiming Zhou,
Changle Wang,
Haiming Jiang,
Di Peng,
Hongyan Xia,
Kang Xie,
Lin Zhang
Publication year - 2020
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.382528
Subject(s) - cladding (metalworking) , optics , long period fiber grating , materials science , polarization (electrochemistry) , phase matching , grating , polarization maintaining optical fiber , cladding mode , mode coupling , spectral line , physics , optical fiber , molecular physics , fiber optic sensor , laser , chemistry , astronomy , metallurgy
We report on the detailed analyses of mode coupling from fiber core to cladding in excessively tilted fiber gratings (ETFGs). Cladding modes responsible for the typical dual peak pairs in the transmission spectrum of ETFGs are identified with phase matching condition, which suggests two set of dual peak pairs generated from coupling to cladding modes with even and odd azimuthal order. The polarization dependence of those dual peak pairs are also investigated by calculating the coupling coefficients of cladding modes for two orthogonal polarizations. With the calculated coupling coefficients, the measured polarization dependent spectra can be reproduced numerically.