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. 10, 1994
Filed:
Nov. 25, 1992
Applicant:
Inventors:
Abbas Behfar-Rad, Wappingers Falls, NY (US);
Mark E Jost, Fishkill, NY (US);
Christoph S Harder, Zurich, CH;
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ; G02B / ;
U.S. Cl.
CPC ...
372 96 ; 372 43 ; 372 50 ; 372 45 ; 385131 ;
Abstract
A semiconductor ridge waveguide laser structure with a roughened sidewall ridge that includes a substrate and an active layer disposed between lower and upper cladding layers. The structure further includes a waveguide ridge which comprises a contact layer and a trapezoidal ridge portion 16 of the upper cladding layer. The trapezoidal ridge portion has roughened sidewalls which provides low contact resistance.