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:
Aug. 12, 2003
Filed:
Aug. 30, 2002
Hiroshi Sato, Kokubunji, JP;
Masahiro Aoki, Kokubunji, JP;
Tsurugi Sudoh, Kokubunji, JP;
Akira Taike, Kokubunji, JP;
Tomonobu Tsuchiya, Hachioji, JP;
Masaaki Komori, Kokubunji, JP;
Kazuhisa Uomi, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical transmission device particularly adapted to a high-speed and large-capacity optical transmission system with a large optical output and excellent reflection resistance includes a waveguide-type optical element for emerging light and an optical transmission path that is to be optically coupled to the waveguide-type optical element. The waveguide-type optical element includes, at least in part thereof, a light-emitting portion having a gain-coupled diffraction grating and a mode-converting region integrated with the light-emitting portion.