Patent ID: 7210862

Claim:
An optical subassembly optically coupled with an optical fiber, said optical subassembly comprising: a semiconductor optical device; a co-axial package including a disk-shaped stem, a plurality of lead pins and a cap, said stem having a first surface and a second surface opposite to said first surface, said lead pins passing thorough said stem and being grouped in two groups each group forming an array of lead pins extending in parallel to each other, said cap forming a cavity cooperating with said stem, said semiconductor optical device being installed on said first surface of said stem so as to be sealed within said cavity; a plurality of cylindrical members attached to said co-axial package, said cylindrical members optically aligning said semiconductor optical device with said optical fiber; and a heat-radiating fin including a body portion, a slab portion, and a plurality of leg portions, said body portion being attached to said second surface of said stem and having a slot for passing said lead pins therethrough, said slab portion extending and bending from said body portion to a first direction, said leg portions extending and bending to a second direction opposite to said first direction, wherein a gap between said leg portions is substantially equal to a gap between said arrays of said lead pins.