An apparatus is provided that allows the tunability of a waveguide bench router with a silicon-based material. This is accomplished by adding a triangular shaped layer of hydrogenated amorphous silicon (a-Si:H) as an active region across the waveguide. By varying a current across the triangle, the refractive...http://www.google.fr/patents/US5515460?utm_source=gb-gplus-shareBrevet US5515460 - Tunable silicon based optical router
