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:
Jun. 23, 2009
Filed:
Jul. 11, 2005
Tougo Fukushi, Ebetsu, JP;
Hideaki Sugiya, Fujisawa, JP;
Akira Yamamoto, Fukuoka, JP;
Masanori Kondoh, Sapporo, JP;
Tougo Fukushi, Ebetsu, JP;
Hideaki Sugiya, Fujisawa, JP;
Akira Yamamoto, Fukuoka, JP;
Masanori Kondoh, Sapporo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the up-stream side during the shutdown state, by outputting ASE light with the same intensity as the WDM signal. Accordingly, before realizing the recovery of shutdown, the gain setting is completed with the light whose intensity is within the safe criterion. After realizing the recovery of shutdown, the optical transmission system can be returned quickly to the regular operating state after recovery of shutdown state.