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:
Jan. 13, 2004
Filed:
Aug. 15, 2001
Applicant:
Inventors:
Peter Bloechl, Goslar, DE;
Gian-Luca Bona, Hedingen, CH;
Folkert Horst, Kilchberg, CH;
Ilana Massarek, Thalwil, CH;
Bert Offrein, Langnau am Albis, CH;
Roland Germann, Wangen, CH;
Huub Salemink, Groesbeek, NL;
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/22 ;
U.S. Cl.
CPC ...
G02B 6/22 ;
Abstract
An optical waveguide device is proposed which comprises a substrate, thereupon a lower cladding layer, thereupon an upper cladding layer and between said cladding layers a waveguide element. The influence of the substrate on the stress-induced birefringence of the optical waveguide device is reduced by modification of the substrate from underneath the waveguide element.