Patent ID: 8482849

Claim:
A Raman amplifier that supplies pump light to a transmission line, and amplifies wavelengths multiplexed signal light that propagates on the transmission line, the Raman amplifier comprising: a Raman pump light supply section configured to have a plurality of pump light sources with different wavelengths, and to supply pump light output from the respective pump light sources to the transmission line; a monitor section configured to monitor the light propagated on the transmission line, to acquire information necessary for judging Raman gain in the transmission line; and a control section configured, when information related to a type of the transmission line is notified from outside of the Raman amplifier, to specify a pump light source to be switched on and a pump light source to be switched off, from among the plurality of pump light sources, corresponding to the type of the transmission line, and to control the drive state of the pump light source that is specified to be switched on.