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:
Dec. 06, 2011
Filed:
Jul. 31, 2007
Applicant:
Ryosuke Goto, Kawasaki, JP;
Inventor:
Ryosuke Goto, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 10/08 (2006.01); H04B 17/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An apparatus for measuring an OSNR for a communication channel in a WDM optical communications system includes a signal control unit, a receiving unit, and a measuring unit. The signal control unit controls spectral width reduction for an optical signal sent through a target channel. The receiving unit receives spectral data measured from the optical signal received by the target channel under control of the control unit. The measuring unit, based on the spectral data received by the receiving unit, measures the OSNR of the target channel.