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:
Oct. 23, 2012
Filed:
Jun. 23, 2008
Martin Schell, Berlin, DE;
Norbert Keil, Berlin, DE;
Huihai Yao, Berlin, DE;
Crispin Zawadzki, Berlin, DE;
Martin Schell, Berlin, DE;
Norbert Keil, Berlin, DE;
Huihai Yao, Berlin, DE;
Crispin Zawadzki, Berlin, DE;
Abstract
The invention relates to a method and to an apparatus for compensating the polarization-dependent shift of the center frequency in an optical filter comprising an interferometer by way of compensating the birefringence in at least one waveguide of the interferometer, wherein at least one half-wave plate is arranged into the optical path of the interferometer and at least a section of the waveguide () on the right and on the left of the half-wave plate () is brought to a pre-selectable temperature, and wherein at least one section on the right of the half-wave plate () is brought to a first temperature T, and at least one section on the left of the half-wave plate () is brought to a second temperature T.