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:
Jul. 29, 2008
Filed:
Mar. 25, 2005
Jun-ichi Hashimoto, Yokohama, JP;
Tsukuru Katsuyama, Yokohama, JP;
Kenji Koyama, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
The present invention provides an optical device integrating an active device with a passive device without any butt joint structure between two devices. The optical integrated device of the invention includes a GaAs substrate, first and second cladding layers, and an active layer sandwiched by the first and second cladding layers. These layers are disposed on the GaAs substrate. The GaAs substrate provides a first region and a second region. The active layer comprises of the first active layer disposed on the first region and the second active layer disposed on the second region of the GaAs substrate. The first active layer has a quantum well structure whose band-gap energy smaller than 1.3 eV, while the second active layer has a quantum well structure whose band-gap energy is greater than that of the first active layer.