Patent ID: 8192638

Claim:
A method for manufacturing multiple layers of waveguides, said method comprising: depositing a first cladding layer on a substrate, a first inner cladding layer on said first cladding layer, and a first waveguide material on said first inner cladding layer; selectively etching said first inner cladding layer and said first waveguide material to form a first waveguide layer; depositing a second inner cladding layer followed by a second cladding layer on said first waveguide layer; removing said second inner cladding layer and planarizing said second cladding layer using a process selective to said first waveguide material to expose said first waveguide material; depositing a third inner cladding layer followed by a second waveguide material on said first waveguide material; selectively etching said third inner cladding layer and said second waveguide material to form a second waveguide layer; and depositing a fourth inner cladding layer followed by a third cladding layer on said second waveguide layer.