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:
Oct. 21, 2014
Filed:
Aug. 29, 2012
Applicant:
Yoshihiro Tateiwa, Yokohama, JP;
Inventor:
Yoshihiro Tateiwa, Yokohama, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 10/08 (2006.01); H04B 17/00 (2006.01); H04B 10/06 (2006.01); H04B 10/61 (2013.01); G01J 9/00 (2006.01); H04L 27/36 (2006.01); H04L 27/38 (2006.01);
U.S. Cl.
CPC ...
H04B 10/6165 (2013.01); G01J 9/00 (2013.01); H04L 27/364 (2013.01); H04L 27/3863 (2013.01);
Abstract
A device able to evaluate a phase difference between I-component and Q-component of signal light generated by an optical hybrid is disclosed. The device includes a detector, a compensator and an evaluator. The detector detects positive and negative elements of each of the I-component and the Q-component. The compensator generates a compensated I-component and a compensated Q-component so as to keep the sum of positive and negative elements of each of components in constant. The evaluator determines the phase difference via an ellipsoid drawn by the compensated I- and Q-components.