Receiving optical subassembly with an improved high frequency performance
AssigneeSumitomo Electric Industries, Ltd.
InventorsSatoshi Iguchi, Yasushi Fujimura, Hiroyuki Yabe
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Abstract
The present invention provides a receiving optical subassembly (ROSA) with a co-axial shape and a stem for mounting semiconductor devices thereon that improves the high frequency performance of the ROSA. The ROSA mounts a photodiode (PD) and a pre-amplifier on a stem and the stem has a hollow the PD and the pre-amplifier are mounted therein. Since the hollow has a depth substantially equal to a thickness of the pre-amplifier, the bonding wire from the pre-amplifier to the surface of the stem may become shortest to reduce the parasitic inductance of the bonding wire and to enhance the high frequency performance of the ROSA.
Claims10
An optical assembly, comprising:
- a semiconductor light-receiving device for generating an electrical signal;
- a pre-amplifier electrically connected to the semiconductor light-receiving device for amplifying the electrical signal;
- and
- a metal stem including a mounting region and a bonding region, the mounting region mounting the semiconductor light-receiving device and the pre-amplifier thereon, the pre-amplifier being grounded in the bonding region,
- wherein the mounting region of the stem is formed lower with respect to the bonding region.
Dependencies are inferred from the claim text.