Patent ID: 7116881

Claim:
An optical waveguide on a substrate, where the optical waveguide is comprised of: a core comprised of: a slab of monocrystalline silicon, where the slab and a silicon body of a transistor are formed from the same layer of monocrystalline silicon on the same substrate, a layer of dielectric material disposed on the slab of monocrystalline silicon, where the layer of dielectric material and a gate oxide for a transistor are formed at the same time of the same dielectric material, and a strip of polysilicon disposed on the layer of dielectric material, where the strip and a polysilicon gate for a transistor are formed at the same time from the same polysilicon, and a cladding comprised of a plurality of dielectric materials, where at least one of the plurality of dielectric materials is comprised of a salicide block layer used during the fabrication of a transistor on the same substrate.