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:
Sep. 26, 2006
Filed:
Feb. 25, 2003
Yoshihiro Shimizu, Kawasaki, JP;
Makoto Takakuwa, Kawasaki, JP;
Shoji Yoshida, Kawasaki, JP;
Tooru Matsumoto, Kawasaki, JP;
Akio Morimoto, Kawasaki, JP;
Yoshihiro Shimizu, Kawasaki, JP;
Makoto Takakuwa, Kawasaki, JP;
Shoji Yoshida, Kawasaki, JP;
Tooru Matsumoto, Kawasaki, JP;
Akio Morimoto, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical transmission system includes an optical wavelength branching unit that shifts a wavelength transmission band in the short-wavelength or long-wavelength directions based on a branching filter operation temperature, and performs a branching operation on a wavelength-multiplexed signal. A reception transponder performs decoding on an error correction code. An error correction monitoring unit gathers an error correction amount upon which a branching filter temperature control unit sets the branching filter operation temperature. A transmission transponder performs encoding on an error correction code. An optical wavelength combining unit shifts the wavelength transmission band in the opposite direction from the shifting direction based on a combining filter operation temperature, to perform a combining operation on optical signals and output a wavelength-multiplexed optical signal. A combining filter temperature control unit sets the combining filter operation temperature based on the error correction amount sent from the optical reception device.