Title :
A variational coupled-mode theory including radiation loss for grating-assisted couplers
Author :
Little, Brent E.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA
fDate :
2/1/1996 12:00:00 AM
Abstract :
We calculate higher order effects such as frequency shifts and radiation loss in grating waveguides and grating couplers. The approach follows a vector variational principle which incorporates the Floquet components correct to first order. It is unnecessary to bring radiation modes into the formalism. This yields a simple coupled-mode formulation which includes attenuation due to radiation loss, and is correct to third order in the index contrast of the grating. Numerous examples are given which show excellent agreement with rigorous numerical simulations
Keywords :
diffraction gratings; optical couplers; optical losses; optical waveguide theory; variational techniques; vectors; Floquet components; attenuation; coupled-mode formulation; first order; frequency shifts; grating couplers; grating waveguides; grating-assisted couplers; higher order effects; index contrast; radiation loss; radiation modes; rigorous numerical simulations; variational coupled-mode theory; vector variational principle; Couplers; Distributed feedback devices; Frequency; Gratings; Nonlinear optical devices; Numerical simulation; Optical attenuators; Optical filters; Optical resonators; Optical waveguides;
Journal_Title :
Lightwave Technology, Journal of
