Patent ID: 8041231

Claim:
A supervisory controlling method for supervising and controlling an optical repeater based on supervisory control information to be transmitted together with a wavelength-division multiplexed signal light propagated through an optical transmission path in an optical amplifying-and-repeating transmission system for amplifying and repeatingly transmitting said wavelength-division multiplexed signal light by said optical repeater, comprising: supplying a plurality of excitation lights of different wavelengths from the optical repeater to a Raman amplifying medium on said optical transmission path, Raman amplifying and repeatingly transmitting the wavelength-division multiplexed signal light propagated through said optical transmission path, among the plurality of excitation lights to be supplied to said Raman amplifying medium, and applying a modulation onto the excitation light enabling Raman amplification of the signal lights at a longer wavelength side included in said wavelength-division multiplexed signal light, to thereby return a response signal to a supervisory controlling command.