Gm. Berry et al., ANALYSIS OF MULTILAYER SEMICONDUCTOR RIB WAVE-GUIDES WITH HIGH REFRACTIVE-INDEX SUBSTRATES, Electronics Letters, 29(22), 1993, pp. 1941-1942
The waveguiding properties of semiconductor rib waveguides with high r
efractive index substates are studied using the spectral index method.
The propagation constants of leaky modes in such two-dimensional stru
ctures are calculated for the first time. The method is applied to the
design of high wall GaAs/AlGaAs rib waveguides. Results indicate that
the number of low-loss modes can be controlled by careful positioning
of the substrate relative to the guiding region.