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. 20, 2006
Filed:
Feb. 13, 2003
Kazunori Horachi, Kawasaki, JP;
Taro Asao, Kawasaki, JP;
Kazuo Tanaka, Kawasaki, JP;
Nobuyuki Nemoto, Kawasaki, JP;
Hiroyuki Matsumoto, Kawasaki, JP;
Miwa Taniguchi, Kawasaki, JP;
Toshihiro Suzuki, Kawasaki, JP;
Manabu Suzuki, Kawasaki, JP;
Kazunori Horachi, Kawasaki, JP;
Taro Asao, Kawasaki, JP;
Kazuo Tanaka, Kawasaki, JP;
Nobuyuki Nemoto, Kawasaki, JP;
Hiroyuki Matsumoto, Kawasaki, JP;
Miwa Taniguchi, Kawasaki, JP;
Toshihiro Suzuki, Kawasaki, JP;
Manabu Suzuki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In each node of an optical transmission system: an optical preamplifier has an ALC function for maintaining an optical output level constant and an AGC function for maintaining the gain constant; the operational mode of the optical preamplifier is changed from an ALC mode to an AGC mode after the gain is set in the ALC mode; an optical postamplifier has an AGC function; an optical switch unit performs an optical crossconnect operation; and a thru-light-shutoff control unit makes a switch setting so as to shut off pass-through light in the optical switch unit and stop transmission of an optical signal having an unstable level to a next stage when the optical preamplifier operates in the ALC mode, and clears the switch setting when the operational mode of the optical preamplifier is changed to the AGC mode.