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:
Aug. 28, 2001
Filed:
Apr. 01, 1999
Wolfgang Dultz, Frankfurt am Main, DE;
Leonid Beresnev, Columbia, MD (US);
Heidrun Schmitzer, Regensburg, DE;
Bernhard Hils, Koenigstein, DE;
Joachim Vobian, Muehltal, DE;
Deutsche Telekom AG, Bonn, DE;
Abstract
A method and a device are described to compensate for polarization mode dispersion in an optical transmission link(,′) having polarization-dependent transmission characteristics, in particular in optical fibers and cables with not only statistical, but preferred birefringence. A compensation element (,″), whose length is adjusted non-destructively using an interference device (,″), in particular a pressure mechanism, is connected upstream or downstream from the transmission link (,′). The polarization states P,and P,of the compensation element are mixed by the interference and thus the length of the compensation fiber is defined at which a propagation time difference between the partial waves of polarization states P,and P,is increased or decreased so that it compensates for the propagation time difference &tgr; within the transmission link (,′).