Dispersion characteristics of a metal-clad rectangular cored lightguide under the weak guidance condition

Abstract

We investigate the dispersion curves for some low order modes sustained by a rectangular core lightguide with one - fourth of the non-guiding region loaded with metal. From the characteristic equation obtained by Goell's point matching method under weak guidance approximation, the dispersion curves are obtained and compared with a metal-clad lightguide having a square core cross-section. It is found that dispersion curves are almost similar in the two cases.