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:
Jul. 16, 2024
Filed:
Jun. 10, 2020
Ntt Electronics Corporation, Yokohama, JP;
Tomohiro Takamuku, Yokohama, JP;
Mitsuteru Yoshida, Yokohama, JP;
Tsutomu Takeya, Yokohama, JP;
Tomoharu Senboku, Yokohama, JP;
NTT INNOVATIVE DEVICES CORPORATION, Kanagawa, JP;
Abstract
An adaptive equalizer () according to this invention includes an adaptive equalization filter () configured to adaptively compensate for a waveform distortion caused by a polarization fluctuation of a received signal () by updating a tap coefficient, a first tap coefficient updater () configured to calculate the tap coefficient according to the polarization fluctuation of the received signal () using a variable step size and update the tap coefficient of the adaptive equalization filter (), a second tap coefficient updater () configured to calculate the tap coefficient according to the polarization fluctuation of the received signal () using a fixed step size μ, a polarization state estimator () configured to estimate a polarization state of the received signal () using the tap coefficient calculated by the second tap coefficient updater (), and a step size updater () configured to obtain the step size corresponding to the polarization state estimated by the polarization state estimator () and update the variable step size. According to this invention, it is possible to provide an adaptive equalizer that always implements stable followability to various SOP fluctuations.