Patent ID: 7974505
Filing Date: 2011-07-05
Classification: G02B

Abstract:
1. A method for fabricating selectively coupled optical waveguides on a substrate, said method comprising: depositing a first layer of waveguide material on a substrate; etching said first layer of waveguide material to form a plurality of level one waveguides and fill shapes; depositing a dielectric layer on top of said level one waveguides and fill shapes, wherein the deposition surface profile of said dielectric layer tracks the pattern density of said fill shapes; polishing the surface of said dielectric layer; depositing a second layer of waveguide material on said substrate; and etching said second layer of waveguide material to form a plurality of level two waveguides, wherein at least one optically coupled waveguide structure is formed by a first one of said level one waveguides and a first one of said level two waveguides, and at least one non-optically coupled waveguide structure is formed by a second one of said level one waveguides and a second one of said level two waveguides, wherein said at least one optically coupled waveguide structure is located adjacent to said at least one non-optically coupled waveguide structure.