Optical filters in, for example, a wavelength division multiplexing (WDM) fiber optic system or an optical waveguide device are utilized and provided. The optical waveguide device comprises a lower substrate layer, an insulating dielectric layer and a waveguide ribs layer. The insulating dielectric layer,...http://www.google.com/patents/US6580863?utm_source=gb-gplus-sharePatent US6580863 - System and method for providing integrated optical waveguide device
