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. 03, 2020
Filed:
Sep. 02, 2019
Ciena Corporation, Hanover, MD (US);
Shahab Oveis Gharan, Nepean, CA;
Michael Andrew Reimer, Stittsville, CA;
Andrew D. Shiner, Kanata, CA;
Hamid Ebrahimzad, Ottawa, CA;
Maurice O'Sullivan, Ottawa, CA;
Kim B. Roberts, Ottawa, CA;
Ciena Corporation, Hanover, MD (US);
Abstract
An optical transmitter () is operable to generate an optical signal () by modulating a number N of frequency divisional multiplexing (FDM) subcarriers using transformed digital signals which are determined by applying a pseudo FDM (pFDM) transformation to preliminary digital signals representative of multi-bit symbols. Rather than experiencing the effects of the number N of FDM channels, the optical signal experiences the effects of a different number M of pFDM channels, where M≠N. In some examples, the number M of pFDM channels is less than the number N of FDM channels, and frequency-dependent degradations may be averaged across different symbol streams. In other examples, the number M of pFDM channels is greater than the number N of FDM channels, and different symbol streams may experience different frequency-dependent degradations. An optical receiver () is operable to apply an inverse pFDM transformation to recover estimates of the multi-bit symbols.