Raman amplification method, raman amplifier, and optical transmission system

摘要

The present invention relates to a Raman amplification method realizing Raman amplification of WDM signal light in a wider amplification wavelength band with a simpler configuration, and the like. A Raman amplifier realizing the Raman amplification method comprises a Raman amplification optical fiber, and a pumping light source for supplying pumping light having a wavelength lambdap to the amplification optical fiber. In the Raman amplifier, a part of the signal light is Raman-amplified with the pumping light having the wavelength lambdap, whereas a part of the Raman-amplified light is utilized as pumping light. This Raman-amplifies signal light including a channel wavelength with a wavelength of (lambdap+Deltalambda+20 nm) or longer, where Deltalambda is the Raman shift amount of wavelength caused by the pumping light at the wavelength lambdap.