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:
Oct. 19, 1999
Filed:
Sep. 17, 1997
Applicant:
Inventors:
Yuzo Hirayama, Yokohama, JP;
Masahisa Funemizu, Yokohama, JP;
Masaki Tohyama, Yokohama, JP;
Motoyasu Morinaga, Yokohama, JP;
Keiji Takaoka, Kawasaki, JP;
Kazuhiro Inoue, Yokohama, JP;
Makoto Ohashi, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ; H01S / ;
U.S. Cl.
CPC ...
372 96 ; 372 45 ; 372 50 ; 372102 ;
Abstract
A grating coupled surface emitting laser has a diffraction grating of a second or higher order for guided-mode light part of a waveguide region, and extract a beam in a direction perpendicular to the waveguide region. By narrowing a stripe of the waveguide region around the center, the phase of the diffraction grating is shifted to attain a Gaussian distribution for radiation-mode light in a cross section along the waveguiding direction.