Patent ID: 8447184

Claim:
A method for setting up a wavelength division multiplexing optical transmission system with Raman amplification, in which optical signals are transmittable within a transmission band via an optical waveguide between a transmitter and a receiver, the method comprising: defining a first target parameter for an average amplification for Raman amplification within the transmission band, the first target parameter being correlated with one or more first pump frequencies and a non-distorted first amplification profile being defined by the one or more first pump frequencies; determining one or more second pump frequencies for a second amplification profile that is distorted with respect to the first amplification profile, wherein the second amplification profile is pre-elevated according to a second target parameter having increased gain at relatively higher frequencies of the transmission band; providing one or more pumps having the second pump frequency or frequencies for the Raman amplification of the signals to be transmitted; and providing a rectifier for rectifying the distorted second amplification profile such that a rectified amplification profile is generated according to a target parameter having substantially constant gain at all frequencies of the transmission band for operating the transmission system.