Patent attributes
An optical node is configured to enable time-division distribution of pump light for effectively utilizing pump power. The optical node is provided with an excitation light source unit for Raman amplification, outputting Raman excitation light of a plurality of wavelengths; a control unit outputting the Raman excitation light of the plurality of wavelengths, wavelength by wavelength on a time division basis; and a Raman amplifier distributing and feeding the Raman excitation light of the plurality of wavelengths, wavelength by wavelength on a time division basis, in the opposite direction to the signal light transmission direction. In each receiving port, a period of the Raman excitation light being output wavelength by wavelength on a time division basis is set shorter than a signal light response time in the Raman amplifier to the Raman excitation light.
