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:
Nov. 15, 2011
Filed:
Jul. 06, 2010
James Harley, Nepean, CA;
Douglas Mcghan, Ottawa, CA;
Mohammad Sotoodeh, Kanata, CA;
Anant Grewal, Gloucester, CA;
Mark Hawryluck, Kanata, CA;
James Harley, Nepean, CA;
Douglas McGhan, Ottawa, CA;
Mohammad Sotoodeh, Kanata, CA;
Anant Grewal, Gloucester, CA;
Mark Hawryluck, Kanata, CA;
Ciena Corporation, Linthicum, MD (US);
Abstract
A method of controlling a polar optical transmitter comprising a dual-branch Mach-Zehnder (MZ) modulator driven by a pair of independent electrical drive signals. A cost function is provided which defines a relationship between a control parameter of the optical transmitter and a power level of an output optical signal generated by the MZ modulator. A selected component of the electrical drive signals is dithered using a predetermined dither signal. A modulation depth of the output optical signal power level corresponding to the dither signal is detected, and the control parameter adjusted based on the cost function and the detection result.