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. 23, 2025
Filed:
Jun. 26, 2023
Nokia Solutions and Networks Oy, Espoo, FI;
Paolo Serena, Podenzano, IT;
Chiara Lasagni, Quattro Castella, IT;
Alberto Bononi, Lesignano de' Bagni, IT;
Matteo Lonardi, Villafranca di Verona, IT;
Petros Ramantanis, Antony, FR;
Amirhossein Ghazisaeidi, L'Hays-les-Roses, FR;
Nokia Solutions and Networks Oy, Espoo, FI;
Abstract
A digital processor (DP) is configured to obtain a temporal sequence of digital phase distortion measurements of a first optical signal received by a coherent optical receiver (COR) from an optical fiber link, where the first optical signal co-propagates with a second, power-modulated, optical signal in different frequency channels. The DP is configured to estimate a cross-correlation between the temporal sequence of digital measurements and a temporal sequence of powers of the second optical signal for a plurality of relative time shifts between the sequences, and to identify a location along the optical fiber link based on a magnitude of the cross-correlation exceeding a threshold for a particular time shift.