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:
Nov. 04, 2003
Filed:
Feb. 14, 2002
Mitsunobu Gotoda, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A high performance single-wavelength semiconductor laser device having stable and high-speed operation includes an active region, a forward light reflection region located in front of the active region, a backward light reflection region located behind the active region, and a phase control region located in proximity to the active layer, all sandwiched between an upper cladding layer and a lower cladding layer. The forward light reflection region and the backward light reflection region include alternate diffraction grating portions and non-diffracting portions alternately. The laser oscillates at a wavelength which corresponds to the current flowing in the diffraction grating portion. A current blocking layer is located on the non-diffracting portion of at least one of the forward light reflection region and the backward light reflection region for blocking current from flowing into the non-diffracting portion.