Patent ID: 6542687
Filing Date: 2003-04-01
Classification: G02B

Abstract:
A method of making a polarization insensitive optical waveguide structure, the method comprising the steps of:a) forming an optical core layer on a substrate, the optical core layer having a higher refractive index than the substrate; b) forming a mask over the optical core layer; c) over-etching an unmasked area of the optical core layer to define an optical core, wherein the over-etching removes the unmasked area of the optical core layer and a portion of the substrate disposed beneath the unmasked area of the optical core layer, and defines the optical core; d) removing the mask from the optical core; and e) forming a cladding layer over the optical core and the substrate, the cladding layer having a lower refractive index than the optical core, to form a polarization insensitive optical waveguide structure.