Topchiev, “Improvement of the Optical Channel Noise Characteristics Using

Abstract – In this paper a theoretical basis for simulation of amplifier noise parameters is provided. On the base of propagation equations the evolution of the net system gain and the added noises due to the spontaneous Raman scattering and the double Rayleigh backscattering of the signal is simulated. A mathematical model for the carrier-to-noise ratio (CNR) of the distributed Raman amplifier due to the noise components is obtained. The influence of the pump power, the net gain and the length of the transmission span on the noise parameters is researched and the working regime of the amplifier is optimized so that maximum of the CNR and improvement of the amplifier performance are attained