An optical panel is disclosed. A plurality of stacked planar optical waveguides are used to guide light from an inlet face to an outlet face of an optical panel. Each of the optical waveguides comprises a planar sheet of core material having a central plane. The core material has an index of refraction...http://www.google.es/patents/US6307995?utm_source=gb-gplus-sharePatente US6307995 - Planar optical waveguides for optical panel having gradient refractive index core
Planar optical waveguides for optical panel having gradient refractive index ...
