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:
Jul. 22, 2014
Filed:
Oct. 31, 2012
Douglas James Beckett, Kanata, CA;
Nourhan Eid, Ottawa, CA;
Michael Reimer, Stittsville, CA;
Xuefeng Tang, Ottawa, CA;
Maurice O'sullivan, Ottawa, CA;
Douglas James Beckett, Kanata, CA;
Nourhan Eid, Ottawa, CA;
Michael Reimer, Stittsville, CA;
Xuefeng Tang, Ottawa, CA;
Maurice O'Sullivan, Ottawa, CA;
Ciena Corporation, Hanover, MD (US);
Abstract
A method of estimating nonlinear transmission impairments of an Optical Channel (OCh) trail in an optical communications network. A per-span nonlinear field variance is calculated for each span of the trail. The per-span nonlinear field variance represents nonlinearly induced noise due to the transmission impairments of that span. The nonlinearly induced noise being imparted to a signal transmitted through the trail and detected by the receiver. A respective covariance between the nonlinear fields contributed by each span pair of the OCh trail is computed. The covariance represents the correlation of the nonlinearly induced noise imparted to the signal within the first span of a span pair with the nonlinearly induced noise imparted to the signal within the second span of the pair. A covariance matrix is populated using the computed per-span variance values and covariance values. A total nonlinear field variance is computed by summing over the covariance matrix elements.