Abstract: Two advances in spectral methods for the fast and accurate analysis of optical waveguides are reported. The Spectral Index method has been extended to include arbitrarily shaped rib waveguides in air. Then a Half Space Radiation Mode method is developed to calculate the facet reflectivity of 2D waveguides buried at realistic depth. Keywords: optoelectronics, rib waveguides, facet reflectivity.
Key words: Optoelectronics, waveguides, spectral index method, half space radiation model.