Patent ID: 7986453
Filing Date: 2011-07-26
Classification: H01S

Abstract:
1. A Raman amplifier, comprising: a light source unit that supplies lights of a plurality of wavelengths to an optical fiber transmission channel and performs Raman amplification; a signal light monitor that monitors an intensity of a signal light of each wavelength contained in an input signal light; an output light intensity deviation monitoring circuit that finds a deviation in the intensity of each signal light detected by the signal light monitor; and a light control circuit that controls a light intensity from light sources of each wavelength constituting the light source unit based on the deviation of the intensity of signal light found by the output light intensity deviation monitoring circuit, wherein the light control circuit has a storage unit that stores a sum total quantity of light intensities of wavelengths before implementing control of light intensity, and the light control circuit controls the light intensity from light sources of each wavelength by distributing the sum total quantity of light intensities stored in the storage unit according to a deviation ratio of intensities of signal lights found in the output light intensity deviation monitoring circuit.