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:
Nov. 01, 2011
Filed:
Sep. 30, 2008
Miki Onaka, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Togo Fukushi, Kawasaki, JP;
Masanori Kondoh, Kawasaki, JP;
Kiyotoshi Noheji, Kawasaki, JP;
Takashi Hayasaka, Minato, JP;
Miki Onaka, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Togo Fukushi, Kawasaki, JP;
Masanori Kondoh, Kawasaki, JP;
Kiyotoshi Noheji, Kawasaki, JP;
Takashi Hayasaka, Minato, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A Raman amplifier inputs pump light into an optical fiber (transmission path) through which an optical signal passes, to amplify the optical signal. An optical receiving unit is provided downstream of the Raman amplifier and monitors the power of the optical signal amplified by the Raman amplifier. A calculating unit determines Raman amplification gain based on the power of the optical signal monitored by the optical receiving unit, and calculates the power of a noise component included in the optical signal based on the gain. The calculating unit, in real-time, calculates the power, which varies in complicated manners depending on conditions, and outputs information concerning to the power to another apparatus at a frequency on the order of milliseconds.