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:
Apr. 13, 2010
Filed:
Oct. 16, 2007
Applicant:
Boris Kershteyn, Marietta, GA (US);
Inventor:
Boris Kershteyn, Marietta, GA (US);
Assignee:
Ciena Corporation, Linthicum, MD (US);
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
RZ-DQPSK (Return-to-Zero Differential Quadrature Phase Shift Keying) systems and methods are provided with a single real-time phase alignment mechanism. The present invention eliminates the requirement for phase adjustment between a carver modulator and a DQPSK modulator. In an exemplary embodiment, the present invention replaces the carver modulator with AND gates between drivers of a DQPSK modulator and a data processor. The AND gates are configured to provide a single phase alignment signal.