Coherent light generators – Particular active media – Semiconductor
Reexamination Certificate
2007-01-05
2009-12-01
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular active media
Semiconductor
C372S096000
Reexamination Certificate
active
07627011
ABSTRACT:
The present invention is to provide a DFB-LD with a larger coupling efficiency between the grating and the active layer. The DFB-LD of the invention provides an n-type InP substrate, an n-type InP buffer layer, an AlGaInAs layer, a intermediate layer made of a material belonging to a group III-V compound semiconductor and containing phosphorous, and an active layer. The InP substrate and the InP buffer layer form a periodic undulation of the grating. Because of the AlGaInAs layer just provided on the InP buffer layer, the AlGaInAs layer and the intermediate layer can be thinned to get a flat top surface, which enhances the coupling efficiency between the grating and the active layer.
REFERENCES:
patent: 5771256 (1998-06-01), Bhat
patent: 2004/0057483 (2004-03-01), Takemi et al.
patent: 2005/0123018 (2005-06-01), Takagi et al.
patent: 2005/0286582 (2005-12-01), Hayakawa et al.
patent: 11-195836 (1999-07-01), None
Harvey Minsun
Smith , Gambrell & Russell, LLP
Stafford Patrick
Sumitomo Electric Industries Ltd.
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