Patent ID: 7907801
Filing Date: 2011-03-15
Classification: G02B,H01L

Abstract:
1. A package substrate comprising: a substrate; a plurality of interlayer resin insulating layers formed over said substrate; a plurality of conductor circuits formed over said substrate, the plurality of conductor circuits being interposed between said substrate and one of the plurality of interlayer resin insulating layers or interposed between two of the plurality of interlayer resin insulating layers; an optical path configured to transmit an optical signal, the optical path being formed so as to penetrate through the substrate, through the interlayer resin insulting layers and through layers having the conductor circuits thereon; an optical element having p-side external power electrode and an n-side external power electrode, which couple power to the optical element to cause the optical element to operate, the optical element being coupled to the substrate and said optical path of said substrate, the optical element being coupled to the substrate via an underfill filling a gap under said optical element, said underfill having a transmittance for light having a wavelength for communication, of about 70%/mm or more; a microlens coupled to said optical path and configured to transmit an optical signal at a side of the package substrate opposite to the side on which the optical element is mounted; and an optical element driving device coupled to the substrate and configured to drive said optical element for transmission of the optical signal through said optical path, wherein said optical element and said optical element driving device are mounted on a same side of the package substrate and said p-side external power electrode and said n-side external power electrode are each connected to the optical driving element through respective linear conductor circuits each formed of a linear line on a same planar surface of the package substrate and having substantially a same length.