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:
Feb. 07, 2017
Filed:
Jun. 03, 2014
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Fujitsu Telecom Networks Limited, Kawasaki-shi, Kanagawa, JP;
Taku Saito, Kawasaki, JP;
Katsumi Fukumitsu, Kawasaki, JP;
Osamu Takeuchi, Kawasaki, JP;
Hirofumi Araki, Kawasaki, JP;
Kanji Naito, Kawasaki, JP;
Shoichi Murakami, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
An optimization unit in an optical receiver divides a symbol region out of a plurality of symbol regions into which signal points that specifies symbol information included in an optical signal are classified, into a plurality of division regions from the symbol center coordinate of the symbol region. Moreover, the optimization unit accumulates the signal points of the symbol information for every division region in the symbol region. Furthermore, based on the accumulated number of signal points for every division region, the optimization unit controls the average length of a phase estimation unit when the phase noise of the optical signal is calculated.