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:
Sep. 30, 2003
Filed:
Nov. 30, 2000
Klaus Bohnert, Oberrohrdorf, CH;
Hubert Brändle, Oberengstringen, CH;
Philippe Gabus, Baden, CH;
ABB Research Ltd, Zurich, CH;
Abstract
A method is described for producing a fiberoptic waveguide with a basic segment ( ) and a phase shift segment ( ), the basic segment ( ) and phase shift segment ( ) having fiber cores (K) of the same form and the fiber cores being aligned at a defined angle (&agr;) to one another. In the method, use is made of an optical fiber ( ) having a fiber core (K) of the abovenamed form, which fiber is twisted at least approximately by the abovenamed defined angle (&agr;) and held fixed in this torsional position. Subsequently, a stress-relief zone ( ) is heated inside the twisted fiber ( ) until the torsion is released inside the stress-relief zone ( ) and the basic segment ( ) is produced on one side of the stress-relief zone ( ) and the phase shift segment ( ) is produced on the other side. In this case, the fixing of the torsional position is maintained until after solidification of the stress-relief zone ( ).