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, 2013
Filed:
Aug. 15, 2007
Nobuhide Yoshida, Tokyo, JP;
Nobuhide Yoshida, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A dispersion determining apparatus comprises a received waveform monitoring part () and a dispersion amount determining part (). The received waveform monitoring part () has a waveform monitoring circuit () that samples data from the received waveform of a received signal having propagated along a transmission path, and a histogram extracting circuit () that extracts, based on the sampled data obtained by the waveform monitoring circuit (), a histogram data representative of the intensity distribution in the voltage direction of the received waveform. The dispersion amount determining part () has a polarized wave dispersion estimating circuit () that determines the horizontally asymmetric degree of a received eye-pattern waveform of the received waveform obtained by analyzing the histogram data extracted by the received waveform monitoring part () and then estimates, based on the determined asymmetric degree, a polarized wave dispersion amount in the transmission path.