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:
Oct. 13, 2026
Filed:
Sep. 08, 2022
Ntt, Inc., Tokyo, JP;
NTT, Inc., Tokyo, JP;
Abstract
One aspect of the present invention provides a signal processing apparatus including: filter processors, the number of the filter processors depending on the number of spatial modes of a received optical signal; a sum operator that outputs a sum of outputs of a plurality of the filter processors; an IFFT processor that performs inverse Fourier transform on the sum; an output signal selector that outputs a signal including only a predetermined part of an output of the IFFT processor; an error signal output that outputs, as an error signal, a difference between an output of the output signal selector and a desired signal; and an FFT processor that performs Fourier transform on signals including the error signal, in which the filter processors update a filter weight coefficient by using a signal obtained by performing multiplication only on a predetermined part for an output of the FFT processor and a signal obtained by performing processing including Fourier transform on the received optical signal, and the filter processors output a signal obtained by performing multiplication only on a predetermined part for the filter weight coefficient and the received optical signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile