Planar optical waveguide having a core with a coating having a hollow space in the coating and a method for forming the waveguide

摘要

An optical planar waveguide for conducting an optical radiation along an axis consists of a wave-conducting core that extends along the axis and a coating that extends along the axis and surrounds the core, with the coating having at least one hollow space in the solid material of the coating. The waveguide is preferably made by forming a plurality of layers and by forming recesses in one of the layers, which recesses are covered to create the hollow spaces.