Patent ID: 6781747
Filing Date: 2004-08-24
Classification: H01S,H04B

Abstract:
A method for the amplification of wavelength division multiplex signals in a WDM transmission system, wherein pump light is injected into an optical waveguide of the optical transmission system contrary to the transmission direction of the WDM signals and wherein the pump light has a frequency spectrum such that at least one selected WDM signal is individually amplified, independently of at least one non-selected WDM signal, by a Brillouin scattering process in the optical waveguide produced by the pump light,wherein the pump light is generated by means of a narrowband pump-light source and adapted, by means of adaptation process, to a bandwidth of WDM signals to be amplified; and wherein said adaptation process comprises modulation by pseudorandom signals and pulsing said pump light into a switched on and a switched off state.