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:
Mar. 24, 2015
Filed:
Oct. 27, 2011
Applicants:
Kosuke Komaki, Kawasaki, JP;
Osamu Takeuchi, Kawasaki, JP;
Inventors:
Kosuke Komaki, Kawasaki, JP;
Osamu Takeuchi, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 10/06 (2006.01); H04L 25/03 (2006.01); H04B 10/61 (2013.01);
U.S. Cl.
CPC ...
H04L 25/03019 (2013.01); H04B 10/611 (2013.01); H04B 10/6166 (2013.01); H04L 2025/0363 (2013.01);
Abstract
A digital coherent optical receiver includes a processor that is operative to separate electric signals obtained by converting an optical signal into a horizontal signal component and a vertical signal component; to generate a histogram of the horizontal signal component and the vertical signal component as outputs of the equalizing filter; and to determine a presence/absence of local convergence based on distribution of the histogram of the horizontal signal component and the histogram of the vertical signal component.