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. 12, 1988
Filed:
Jul. 23, 1986
Kunihiko Isshiki, Itami, JP;
Wataru Susaki, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Laser light guided by a coupled waveguide (formed by difference in refractive index between n-type and p-type AlGaAs clad layers (2) and (4) and an undoped AlGaAs active layer (3) and difference in refractive index between the p-type AlGaAs clad layers (4) and (7) and a p-type AlGaAs waveguide layer (6)) is guided only by the p-type AlGaAs waveguide layer (6) in the vicinity of end surfaces (40, 42), not to be coupled with the undoped AlGaAs active layer (3). Therefore, surface regions of the end surfaces (40, 42) reflecting the laser light are formed by the p-type AlGaAs clad layers (4, 7) and the p-type AlGaAs waveguide layer (6) being larger in forbidden bandwidth.