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:
Aug. 21, 2012
Filed:
Oct. 20, 2008
Masanori Kondoh, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Togo Fukushi, Kawasaki, JP;
Miki Onaka, Kawasaki, JP;
Kiyotoshi Noheji, Kawasaki, JP;
Masanori Kondoh, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Togo Fukushi, Kawasaki, JP;
Miki Onaka, Kawasaki, JP;
Kiyotoshi Noheji, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
To obtain automatic gain control with high accuracy by including first and second light monitors, a reference light supplying unit supplying reference light of which wavelength is set within a gain band of a distributed Raman amplification and out of a wavelength band of main signal light to the optical transmission path, a first reference light monitor monitoring a power of the reference light input to the optical transmission path from one end side thereof, a second reference light monitor monitoring the power of the reference light output from the other end side of the optical transmission path, and a controlling unit controlling supply of pump light in a pump light supplying unit as well as supervising a state of the optical transmission path, based on monitor results from the first and second light monitor and the monitor results in the first and second reference light monitors.