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. 19, 1997
Filed:
Aug. 31, 1995
Yoshihiro Hisa, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor laser has a semiconductor substrate, an active layer disposed indirectly on the semiconductor substrate, a barrier layer disposed on the active layer having a larger band gap energy than the active layer, and an embedded diffraction grating of stripes of a semiconductor material, the stripes having a width in a resonator length direction, a length perpendicular to the resonator length direction, and a thickness, and are embedded in the barrier layer. The stripes have a constant pitch along the resonator length direction of the waveguide path, a constant thickness, and a width that changes in the resonator length direction or the width is constant and the thickness is changed.