Patent ID: 7072556

Claim:
An active waveguide on a substrate comprising: a waveguide core comprising: a slab of monocrystalline silicon on a substrate, where the slab and a silicon body of a transistor are formed from the same monocrystalline silicon on the same substrate, a layer of a first dielectric material disposed on the slab of monocrystalline silicon, where the layer of a first 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 first dielectric material, where the strip of polysilicon and a polysilicon gate for a transistor are formed at the same time from the same polysilicon, 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, a plurality of doped regions in the slab of monocrystalline silicon, where at least one of the plurality of doped regions is doped at the same time with the same dopant as a doped region in the structure of a transistor on the same substrate, a plurality of ohmic contacts, each of which is formed in a region of the plurality of doped regions in the slab of monocrystalline silicon, where at least one of the plurality of ohmic contacts is formed at the same time with the same material as an ohmic contact in the structure of a transistor on the same substrate, and a plurality of conductive plugs coupling each of the plurality of ohmic contacts to at least one of a plurality of metal layers of an integrated circuit, where at least one of the plurality of conductive plugs is formed at the same time with the same material as a conductive plug coupling an ohmic contact of a transistor on the same substrate with the same one of a plurality of metal layers.