LIGHT AMPLIFYING METHOD AND DEVICE, AND OPTICAL AMPLIFICATION RELAY SYSTEM USING THE DEVICE

摘要

PROBLEM TO BE SOLVED: To flatten the gain of each wavelength by controlling the attenuation quantity of an optical variable attenuator so as to have a slope reverse to a gain slope caused by an SRS from detection results of output power.

SOLUTION: A correction circuit 51 calculates the correction value of the attenuation quantity of the optical variable attenuator 45 from the total optical output power detected by an optical power detection circuit 49, and a control circuit 50 controls the attenuation quantity of the optical variable attenuator 45 so as to negate the slope of a gain wavelength characteristic caused by the influence of the SRS by a downstream side optical transmission path 30 and thereby makes the gain of each wavelength uniform at an input port of an optical amplifier of the next stage through the optical transmission path 30 to flatten the gain wavelength characteristic.

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