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:
May. 04, 1999
Filed:
Nov. 20, 1997
Applicant:
Inventors:
Masaki Tohyama, Souka, JP;
Yuzo Hirayama, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385131 ;
Abstract
This invention provides an optical semiconductor device including a semiconductor substrate having a mesa stripe in which at least an optical waveguide layer is formed, a major surface of the semiconductor substrate being a crystal plane, a semiconductor buried layer formed on the two side surfaces of the mesa stripe, and a stripe cladding layer formed on the mesa stripe region and the semiconductor buried layer and having a shape whose section is substantially trapezoidal and whose side surfaces are crystal planes.