Kg. Sullivan et Dg. Hall, GREENS-FUNCTION APPROACH TO THE COUPLED-AMPLITUDE EQUATIONS FOR CODIRECTIONAL COUPLING, Optics communications, 118(5-6), 1995, pp. 509-514
A scalar Green's function technique is used to obtain the coupled-ampl
itude equations for copropagating, transverse electric polarized waves
in the parallel waveguide, or directional coupler, geometry. The resu
lts are briefly compared to those from conventional formulations, and
extension of the technique to transverse magnetic polarized waves is d
iscussed.