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. 17, 2015
Filed:
Feb. 13, 2012
James Harley, Nepean, CA;
Douglas Mcghan, Ottawa, CA;
Shahab Oveis Gharan, Ottawa, CA;
Kim B. Roberts, Nepean, CA (US);
Mark Rollins, Stittsville, CA;
James Harley, Nepean, CA;
Douglas McGhan, Ottawa, CA;
Shahab Oveis Gharan, Ottawa, CA;
Kim B. Roberts, Nepean, CA (US);
Mark Rollins, Stittsville, CA;
Ciena Corporation, Hanover, MD (US);
Abstract
A transmitter in an optical communications system includes a digital signal processor for processing a data signal to generate a sample stream encoding successive symbols in accordance with a constrained phase modulation scheme having a constellation of at least two symbols and a modulation phase constrained to a phase range spanning less than 4π. A digital-to-analog converter converts the sample stream into a corresponding analog drive signal. A finite range phase modulator modulates a phase of a continuous wavelength channel light in accordance with the analog drive signal, to generate a modulated channel light for transmission through the optical communications system. A receiver in the optical communications system includes an optical stage for detecting phase and amplitude of the modulated channel light and for generating a corresponding sample stream, and a digital signal processor for processing the sample stream to estimate each successive symbol of the modulated channel light.