Basic study of coupling on Si waveguides of grade separation by numerical analysis

Si optical nano-wire waveguide is an important elemental technology that achieves optical wiring in the Si Photonics. We think that the adoption of the grade separation waveguide is inevitable for achievement of more advanced integration and the miniaturization of chips and devices such as the matrix switches. Mutual coupling on the grade separation waveguides can be evaluated quantitatively by numerical analysis tool. When the waveguide to be able to propagate two dominant modes is used, it is shown that two modes induced on overpass by an input mode on underpass.