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. 21, 2006
Filed:
Jan. 06, 2003
Kazunori Horachi, Kawasaki, JP;
Taro Asao, Kawasaki, JP;
Nobuyuki Nemoto, Kawasaki, JP;
Kazuo Tanaka, Kawasaki, JP;
Kazunori Horachi, Kawasaki, JP;
Taro Asao, Kawasaki, JP;
Nobuyuki Nemoto, Kawasaki, JP;
Kazuo Tanaka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A WDM optical transmission apparatus is disclosed utilizing ASE light. The WDM optical transmission apparatus includes a pre-amplifier having two control modes consisting of ALC mode in which the gain of an optical amplifier is controlled such that the total output of the optical amplifier is constant for a multiplexed wavelength number n, and of AGC mode which is a control mode maintaining constant the ratio of an optical input level to an optical output level for the multiplexed wavelength number n; and a post-amplifier having two control modes consisting of ASE mode in which the gain of the post-amplifier is set higher than that in the AGC mode and is set such that the output level of ASE light corresponds to the multiplexed wavelength number n, and of the AGC mode; wherein in the ASE mode, the gain of the pre-amplifier in the WDM optical transmission apparatus at the next node is set under an ALC control utilizing ASE light output from the post-amplifier.