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:
May. 25, 2010
Filed:
Dec. 13, 2004
Alexei Glebov, San Mateo, CA (US);
Alexei Glebov, San Mateo, CA (US);
Fujitsu Limited, Kawasaki, JP;
Abstract
A dynamic polarization controller ('DPC') that and method of dynamic polarization control useful in optical networks is disclosed. The DPC of the present invention has a polymeric optical waveguide formed on a substrate, such as a silicon wafer. An intermediate portion of the waveguide is suspended over a cavity, and a deflecting structure, such as an electrodes, is provided for controllably exerting a force on the suspended portion of the waveguide. Exerting a deflecting force on the suspended portion of the waveguide induces controllable birefringence in the waveguide core and, thereby allows dynamic control over the polarization properties of light passing through the DPC. An array of DPC's of the present invention can be formed on a single substrate and used in an optical network, for example a WDM system whereby plural light signals traveling through a single optical fiber are demultiplexed for processing. A plurality of the DPC may be formed in series on a substrate to increase the degree of polarization control. The DPC's of the present invention may be combined with differential group delay ('DGD') compensators to dynamically compensate for polarization mode dispersion (“PMD”) of optical signals. The DPC's of the present invention can operate in millisecond time-frames, thereby providing real time PMD compensation.