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. 06, 2005
Filed:
Mar. 08, 2001
Kentaro Nakamura, Kawasaki, JP;
Takafumi Terahara, Kawasaki, JP;
Junichi Kumasako, Kawasaki, JP;
Rainer Hainberger, Kawasaki, JP;
Kentaro Nakamura, Kawasaki, JP;
Takafumi Terahara, Kawasaki, JP;
Junichi Kumasako, Kawasaki, JP;
Rainer Hainberger, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Different bands (C-band and L-band) are allotted respectively to an upstream optical signal and a downstream optical signal. In a transmission-path optical fiber for Raman amplification, the C-band optical signal is amplified by pumping light from a C-band pumping light source, and the L-band optical signal is amplified by pumping light from an L-band pumping light source. As a result of this configuration, the optical signals are Raman-amplified through backward pumping in both upstream and downstream directions, whereby negative effects, which could be exerted on the optical signals by forward pumping, can be avoided.