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:
Sep. 02, 2014
Filed:
Oct. 04, 2011
Roberto Magri, Parma, IT;
Raffaele Corsini, Milan, IT;
Ernesto Ciaramella, Rome, IT;
Emma Matarazzo, Avellion, IT;
Andrea Peracchi, Salsomaggiore Terme, IT;
Roberto Magri, Parma, IT;
Raffaele Corsini, Milan, IT;
Ernesto Ciaramella, Rome, IT;
Emma Matarazzo, Avellion, IT;
Andrea Peracchi, Salsomaggiore Terme, IT;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
A method of monitoring a differential group delay (DGD) of an optical communications signal having a polarisation multiplexed modulation format is described. The method includes the operations of receiving a signal and performing analogue to digital conversion of the signal to generate a digitised signal corresponding to one polarisation of the signal and to generate another digitised signal corresponding to another polarisation of the signal, and applying a polarisation mode dispersion(PMD) compensation to each of the digitised signals. The method further includes the operations of obtaining an indication of the channel transfer function of the optical communications signal, determining a DGD in dependence on the indication of the channel transfer function, determining a delay between the PMD compensated digitised signals, subtracting the delay from the DGD to obtain a corrected DGD, and generating and transmitting a monitoring signal with an indication of the corrected DGD.