Patent ID: 6765275
Filing Date: 2004-07-20
Classification: G02B,H01L,H05K

Abstract:
A circuitry substrate comprising:a conductive return plane having a device attachment area; a dielectric layer having a top and a bottom surface, the bottom surface being attached to the return plane, wherein the dielectric layer does not cover the device attachment area; a plurality of signal lines formed on the top surface of the dielectric layer; a plurality of return paths formed on the top surface of the dielectric layer, each of the return paths wrapping around at least one perimeter edge of the dielectric layer and making contact with the return plane; a photonic device that is attached directly to the device attachment area; and a plurality of interconnecting wires that connect anode contact pads on photonic device to respective signal lines on the circuitry substrate; wherein at least one return path extends between each adjacent pair of signal lines, whereby the return paths electrically shield each adjacent pair of signal lines from each other.