Open AccessFull Vector Complex Coupled Mode Theory for Tilted Fiber Gratings
Author(s) -
Yi-Chang Lu,
WeiPing Huang,
Shuisheng Jian
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.000713
Subject(s) - cladding (metalworking) , optics , long period fiber grating , coupled mode theory , mode volume , fiber bragg grating , cladding mode , materials science , physics , radiation mode , perfectly matched layer , graded index fiber , polarization maintaining optical fiber , optical fiber , refractive index , single mode optical fiber , fiber optic sensor , finite difference time domain method , metallurgy
A full vector complex coupled mode theory (CMT) for the analysis of tilted fiber gratings is presented. With the combination of the perfectly matched layer (PML) and the perfectly reflecting boundary (PRB), the continuous radiation modes are well represented by a set of discrete complex modes. Simulation of coupling to radiation modes is greatly simplified and may be treated in the same fashion as guided modes. Numerical results of the tilted fiber Bragg gratings (TFBGs) with outer-cladding index equal, lower and higher than that of the inner-cladding indicate that the complex coupled mode approach is highly effective in the simulation of couplings to cladding and radiation modes in tilted fiber gratings. The reflective TFBGs are investigated by the proposed approach in detail.