Optical waveguide and method for preparing the same

摘要

A polymeric optical waveguide substrate comprises a first region provided thereon with a polymer optical waveguide and an optical waveguide-free second region, the first and second regions being present on the same substrate, wherein it comprises an adhesive layer between the lowermost polymer layer constituting the optical waveguide in the first region and the substrate, for improving the adhesion or adhesive properties of them and wherein it has a groove intruding into the substrate at the boundary between the first and second regions. The waveguide substrate can be prepared by a method comprising the steps of applying an adhesive layer onto the first region, while the second region is free of any adhesive layer; applying a polymer onto the whole surface of the substrate to give a polymer layer for forming an optical waveguide, after the formation of the adhesive layer; cutting the polymer layer at the boundary between the first and second regions; and then peeling off or removing the polymer on the second region.