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:
Mar. 29, 2011
Filed:
Oct. 22, 2004
Pierpaolo Boffi, Voghera, IT;
Lucia Marazzi, Pavia, IT;
Paolo Martelli, Milan, IT;
Mario Martinelli, San Donato Milanese, IT;
Aldo Righetti, Milan, IT;
Rocco Siano, Milan, IT;
Pierpaolo Boffi, Voghera, IT;
Lucia Marazzi, Pavia, IT;
Paolo Martelli, Milan, IT;
Mario Martinelli, San Donato Milanese, IT;
Aldo Righetti, Milan, IT;
Rocco Siano, Milan, IT;
PGT Photonics S.p.A., Milan, IT;
Abstract
A device and method for stabilizing the polarization of polarization multiplexed optical radiation includes an identified channel which is provided with a pilot signal. The device and method are based on providing to the polarization multiplexed optical radiation a controllable polarization transformation; measuring the optical power of a polarized portion of the identified channel downstream the polarization transformation; controlling, responsively to the optical power, the controllable polarization transformation so that the identified channel downstream the polarization transformation has a predefined polarization azimuth; providing to the optical radiation downstream the polarization transformation a further controllable polarization transformation; measuring the optical power of a polarized portion of the identified channel downstream the further controllable polarization transformation; and controlling, responsively to the optical power, the further controllable polarization transformation so that the identified channel downstream the further controllable polarization transformation has a predefined state of polarization.