Patent ID: 8008675

Claim:
A package for mounting an optical element, comprising an insulating SiC substrate for mounting the optical element thereon and a frame, and wherein said SiC substrate is arranged to dissipate heat from said optical element, and wherein said frame is made of a single crystal silicon and is mounted on the insulating SiC substrate, and wherein said frame has a window with a reflecting film in an inner face thereof for reflecting light emitted from the optical element, the window having a widened opening, the optical element being disposed in the window, and wherein the SiC substrate and the single crystal silicon frame have substantially the same thermal expansion coefficients, and wherein through-holes are formed in the insulating SiC substrate, and wherein said package includes an input/output terminal formed on a top surface of the insulating SiC substrate and an input/output pad formed on a bottom surface of the insulating SiC substrate, and wherein an electrical connection between said input/output terminal formed on the top surface of the insulating SiC substrate and said input/output pad formed on the bottom surface of the insulating SiC substrate is formed by metalizing treatment of the through-holes formed in the insulating SiC substrate; and wherein said window has a narrow portion and a wide portion, said wide portion being located at said opening of said window and being wider than said narrow portion, and said narrow portion being located between said insulating SiC substrate and said wide portion of said window, and wherein said wide portion of said window is arranged to receive a lens for converging light and for transmitting said light through said opening in a direction away from said insulating SiC substrate.