Sp. Pogossian et al., DETERMINATION OF THE PARAMETERS OF RECTANGULAR DIELECTRIC WAVE-GUIDESBY NEW EFFECTIVE-INDEX METHODS, J. mod. opt., 42(2), 1995, pp. 403-409
New methods based on effective index considerations are proposed to de
termine the propagation characteristics of rectangular dielectric wave
guides. One of these methods, being based on symmetry considerations,
does not have the ambiguity inherent to the effective index method. Th
e ambiguous character of effective index method is thoroughly analysed
.