Patent ID: 7245421
Filing Date: 2007-07-17
Classification: H04B

Abstract:
1. A wavelength-division multiplexing optical communication system in which an optical lossy medium, optical amplifiers and Raman amplifiers for compensating for loss in the optical lossy medium are cascade-connected, said system comprising: at least two transmission links to separately carry information between two points; a plurality of nodes provided within the transmission links, each node having at least two optical amplifiers provided respectively for the at least two transmission links; means, which is provided in an optical amplifier, for correcting slope of a wavelength characteristic produced by wavelength-dependent loss of the optical lossy medium; acquisition means for determining whether a Raman amplifier exists in a link which is connected to a node the same as that of the optical amplifier and is opposing a link in which said optical amplifier exists, or whether a Raman amplifier exists at an adjacent node downstream of said optical amplifier; and means for deciding, based upon the existence of the Raman amplifier, whether or not to cause the optical amplifier to perform a slope correction.