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. 25, 2007
Filed:
May. 27, 2005
Eiji Ishikawa, Kawasaki, JP;
Toshihiro Otani, Kawasaki, JP;
Eiji Ishikawa, Kawasaki, JP;
Toshihiro Otani, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical transmission system wherein a main signal light is amplified by Raman amplification, and noise light (ASS light) produced by the Raman amplification can be corrected with a simple configuration and with high accuracy. The optical transmission system includes, in each transmission section: a cutoff section for transmitting/cutting off a main signal light outputted from the optical transmitter on the preceding stage and inputted into the Raman amplification medium on an optical transmission line; a control section for varying the power of the pumping light supplied to the Raman amplification medium and changing the state of the cutoff section depending on the variation of the pumping light power; a monitor section for measuring the power of the pumping light supplied to the Raman amplification medium and the power of the light propagated through the optical transmission line and inputted into an optical transmitter on the succeeding stage; and a processing section for separately detecting the power of the main signal light and the power of the ASS light on the basis of the results of the measurement by the monitor section, and correcting the ASS light.