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. 08, 2026
Filed:
Oct. 18, 2021
Nec Corporation, Tokyo, JP;
Masaki Sato, Tokyo, JP;
Manabu Arikawa, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A detector is configured to coherently receive a polarization-multiplexed optical signal transmitted from a transmitter via a transmission line. A digital signal processing circuit is configured to perform equalization signal processing on the reception signal coherently received. A carrier phase compensation filter is configured to compensate for a carrier phase in the reception signal. A 4×2 WL filter is disposed after the carrier phase compensation filter and configured to compensate for distortion included in the polarization-multiplexed optical signal. A filter coefficient updating unit is configured to update a filter coefficient of the carrier phase compensation filter and a filter coefficient of the 4×2 WL filter by use of an output of the 4×2 WL filter.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile