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:
Dec. 31, 2002
Filed:
Sep. 15, 2000
Peter Bloechl, Adliswil, CH;
Gian-Luca Bona, Hedingen, CH;
Roland W. Germann, Wangen, CH;
Horst Folkert, Kilchberg, CH;
Illana Massarek, Thalwil, CH;
Bert Jan Offrein, Langnau, CH;
Huub L. Salemink, Waedenswil, CH;
Dorothea W. Wiesmann, Zurich, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
An optical device with a defined total device stress (&sgr; ) and a therefrom resulting defined birefringence in order to obtain a well defined optical polarization dependence is proposed. It comprises a lower cladding layer ( ) with a first refractive index (n ), thereon an upper cladding layer ( ) with a second refractive index (n ) and between an optical waveguide core ( ) with a third refractive index (n ) which is bigger than the first refractive index (n ) and the second refractive index (n ). The optical waveguide core ( ) has a waveguide core stress (&sgr; ) resulting from the manufacturing process and the upper cladding layer ( ) is manufactured to have an inherent cladding layer stress (&sgr; ) which together with the waveguide core stress (&sgr; ) results in the total device stress (&sgr; ).