Patent ID: 7546016

Claim:
A waveguide comprising a first layer of optical material having a first refractive index, said first layer having a first surface and a second surface, said second surface being opposite said first surface; a first section of optical material on said first surface of said first layer extending into said first layer of optical material, said first section being integral with said first layer of optical material, said first section having a second refractive index, said second refractive index being higher than said first refractive index; a second section of optical material on said second surface of said first layer extending into said first layer of optical material, said second section being integral with said first layer of optical material, said second section having a third refractive index, said third refractive index being higher than said first refractive index; a core layer of optical material for said waveguide formed from said first section overlapping said second section within said first layer, said core layer having a fourth refractive index, said fourth refractive index being higher than said first refractive index, said second refractive index and said third refractive index; wherein said first layer of optical material, said first section of optical material and said second section of optical material form a cladding layer for said waveguide, said cladding layer completely surrounding said core layer; and wherein said optical material of said first layer is the same as said optical material of said first section, said second section and said core layer.