Patent ID: 6937806

Claim:
A method of making a photonic device including an optical waveguide, comprising: depositing a first optical layer over a substrate by plasma enhanced chemical vapor deposition; depositing a first thin spin-on glass interlayer over said first optical layer to smooth out surface roughness in said first optical layer; and depositing a second optical layer over said thin spin-on glass interlayer by plasma enhanced chemical vapor deposition; wherein said first and second optical layers form part of said waveguide; and wherein said optical waveguide comprises a buffer layer, a core layer, and a cladding layer, said first and second optical layers providing respectively said buffer layer and said core layer, and wherein said method further comprises: depositing a second spin-on glass interlayer over said core layer to smooth out surface roughness in said core layer, and depositing a third optical layer over said second thin spin-on glass interlayer by plasma enhanced chemical vapor deposition to form said cladding layer.