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:
Dec. 21, 2021
Filed:
Mar. 22, 2019
Nec Corporation, Tokyo, JP;
Manabu Arikawa, Tokyo, JP;
Toshiharu Ito, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
An optical reception terminal includes a plurality of matrix filters () respectively provided for a plurality of modes and configured to perform polarization separation and equalization on a coherently received signal in a corresponding mode, and two combining filters () respectively provided for two polarizations and configured to combine signals in corresponding polarization among signals output from the plurality of matrix filters () after weighting the signals. Filter coefficients of the plurality of matrix filters () and weighting coefficients of the two combining filters () are controlled based on a deviation from a desired state of both signals in two polarizations after combining by the two combining filters (), so as to minimize a sum of deviations.