An optical waveguide device comprises an optical waveguide for guiding an optical wave therethrough, and a grating coupler, which is located on a surface of the optical waveguide and which couples the guided optical wave traveling in the optical waveguide with an external optical wave. The grating coupler...http://www.google.fr/patents/US5101459?utm_source=gb-gplus-shareBrevet US5101459 - Optical waveguide grating coupler device
