The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 2009
Filed:
Feb. 08, 2008
Takeshi Kitatani, Hino, JP;
Kazunori Shinoda, Musashino, JP;
Koichiro Adachi, Musashino, JP;
Masahiro Aoki, Kokubunji, JP;
Takeshi Kitatani, Hino, JP;
Kazunori Shinoda, Musashino, JP;
Koichiro Adachi, Musashino, JP;
Masahiro Aoki, Kokubunji, JP;
Opnext Japan, Inc., Kanagawa, JP;
Abstract
In an edge emitting laser having a window region with a ridge-waveguide structure, particularly, in a short cavity type of a laser operated with a low current, there has been a problem of its operating current being increased due to current leakage of the window portion. To solve this problem, in the window region, between an n-type substrate and a p-type cladding layer, a semi-insulating semiconductor layer into which Ru is doped is inserted. Alternatively, a stacked structure of a Ru-doped layer and a Fe-doped layer is introduced.