Optiwave software does not model the electrical properties of semiconductors and will not model electrical contact problems, however, if the p or n doping level is high enough, the doped Si has negligible resistance. One can model the highly doped regions as an electric conductor, as shown in OptiBPM_Tech_Background_and_Tutorials.pdf, Lesson 10: Electro-Optic Modulator. In Lesson 10, the highly doped regions are modelled as perfect electrical conductors and the static electric field external to the conductors is found and allowed to modify the semiconductor optical properties by the EO effect.