Patent ID: 6704487
Filing Date: 2004-03-09
Classification: G02F

Abstract:
A method of making an optical waveguide structure having a reduced dn/dt birefringence, the method comprising the steps of:a) forming an optical core layer on a bottom cladding, the optical core layer having a higher refractive index than the bottom cladding; b) etching the optical core layer to define an optical core; c) forming a top cladding over the optical core and the bottom cladding, the top cladding having a lower refractive index than the optical core, and wherein the bottom cladding has a higher dopant concentration than the top cladding; d) etching the top cladding to define a first trench and a second trench parallel to the optical core, the first trench and the second trench configured to relieve a stress on the optical core.