Patent ID: 7835602

Claim:
A method for making a photonic guiding system for directing coherent light, comprising: forming a channel in a substrate to form a waveguide configured to interconnect electronic circuitry on a circuit board, wherein the channel has at least one of a width and a height that is substantially larger than a wavelength of the coherent light; applying a layer of a reflective material to substantially cover an interior of the channel; coupling a cover over the channel to form a large core hollow waveguide, wherein the cover includes a layer of the reflective material; attaching a protective layer that is substantially transparent at the wavelength of the coherent light directly on the layer of reflective material to form a substantially air tight bond over the reflective material to substantially reduce oxidation of the reflective material; and optically coupling a collimating lens to the large core hollow waveguide to enable multiple modes of multi-mode coherent light to be directed substantially in parallel through the waveguide.