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:
Apr. 05, 2016
Filed:
Feb. 18, 2014
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Yuichirou Sakamoto, Kawasaki, JP;
Katsumi Fukumitsu, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A digital coherent receiver, includes: an acquisition circuit configured to acquire a plurality of digital electrical signals obtained by sampling a plurality of analog electrical signals by using a sampling signal and digitally converting the plurality of analog electrical signals, the plurality of analog electrical signals being obtained by subjecting a plurality of optical signals to photoelectric conversion; a phase deviation detector configured to output a detection value corresponding to a phase deviation between the sampling signal and the optical signals by using the digital electrical signals; a determination circuit configured to determine whether or not a variation amount of the detection value is equal to or less than a first variation amount; and a compensation circuit configured to compensate wavelength dispersion of the digital electrical signals based on the detection value when the variation amount is equal to or less than the first variation amount.