Title :
Supermodes of grating-coupled multimode waveguides and application to mode conversion between copropagating modes mediated by backward Bragg scattering
Author :
Peral, Eva ; Yariv, Amnon
Author_Institution :
Dept. of Appl. Phys., California Inst. of Technol., Pasadena, CA, USA
fDate :
5/1/1999 12:00:00 AM
Abstract :
An analysis of multimode waveguides where several modes are coupled via quasiperiodic perturbations is presented. The supermodes (or eigenmodes) of the structure are derived and orthonormality considerations are discussed. In addition, a new type of mode converter between copropagating modes is proposed, where mode conversion is mediated by a backward propagating mode. Adiabatic and nonadiabatic coupling coefficients are considered and the supermode formalism is used to conveniently describe the mode of operation of the device
Keywords :
Bragg gratings; diffraction gratings; eigenvalues and eigenfunctions; light scattering; optical waveguide theory; optical waveguides; perturbation theory; adiabatic coupling coefficients; backward Bragg scattering; backward propagating mode; copropagating modes; eigenmodes; grating-coupled multimode waveguide supermodes; mode conversion; multimode waveguides; nonadiabatic coupling coefficient; orthonormality considerations; quasiperiodic perturbations; supermode formalism; Bragg gratings; Coupled mode analysis; Distributed feedback devices; Equations; Fiber gratings; Optical fiber theory; Optical refraction; Optical scattering; Optical waveguide theory; Optical waveguides;
Journal_Title :
Lightwave Technology, Journal of
