Patent ID: 6525944
Filing Date: 2003-02-25
Classification: H01L,H05K

Abstract:
An apparatus comprising:circuitry disposed upon a first surface of a die made substantially of semiconductor material, wherein the circuitry is capable of interacting with optical signals; and a package to enclose the die with the first surface of the die oriented to face a window in a first external face of the package enabling passage of optical signals between the interior and exterior of the package, wherein the package has electrical contacts disposed about the exterior of the package such that the first external face of the package is substantially covered by other apparatus when the contacts are used to attach the package to the other apparatus, wherein the first external face of the package is made of a substrate with a thermal coefficient dissimilar to that of the die to an extent that the substrate may come out of alignment with the die in response to heat emanating from the die, and wherein at least one portion of the window is made of a material with a thermal coefficient substantially similar to that of the die.