Patent ID: 7158285
Filing Date: 2007-01-02
Classification: H04B

Abstract:
1. A Raman amplification repeater configured to conduct amplification of signal lights by Raman scattering which occurs when pumping lights are applied to a transmission path fiber, the Raman amplification repeater having an arrayed waveguide grating through which bundles of signal lights are divided into a plurality of wavelengths that are monitored and converted to voltage signals that drive circuits associated with each pumping light, wherein output power of said pumping light is controlled by monitoring signal light power by using signal lights having wavelengths for monitoring whose number is not less than the number of said pumping light wavelengths and not more than the number of signal lights and which are monitoring wavelengths in a signal band of said signal light, wherein said monitoring wavelength is set to be a maximum or a minimum value of a Raman amplification spectrum in the signal band.