Patent ID: 6834152
Filing Date: 2004-12-21
Classification: B82Y,G02B,G02F

Abstract:
A silicon-based strip loaded waveguide comprising:a slab portion comprising doped silicon, the slab portion having a first refractive index (n1); a strip portion comprising a silicon-based material selected from the group consisting essentially of doped crystal silicon and polysilicon, the strip portion having a second refractive index (n2); and an insulating transition portion disposed between the slab portion and the strip portion, the insulating transition comprising a silicon-based dielectric material, the insulating transition portion having a third refractive index (n3) that is less than the first refractive index (n1) and the second refractive index (n2), said silicon-based dielectric material in said insulating transition portion insulating said slab portion from said strip portion, wherein said strip portion locally increases the effective index of said slab portion so as to guide light in said slab proximal to said strip portion thereby supporting guided optical propagation in both said strip portion and said slab portion.