Influence of Non-Ideal First Order Counter-Propagating Raman Amplification on Discrete Nonlinear Fourier Spectrum based Communication

The Nonlinear Fourier Transformation (NFT) based transmission concept offers an interesting approach to overcome the impending capacity limitations due to transmission of signals designed for linear channels over the nonlinear fiber channel. Contrary to previous eigenvalue communication approaches [1] it exploits the opportunities of coherent transmission technology and enables the usage of a continuous and discrete nonlinear spectrum while relying on the same theoretical assumption of lossless transmission. The often stated ideal distributed Raman amplification is technically complex and still a topic of research. Instead the opportunities of state of the art non-ideal counter-propagating C-band Raman amplification modules are investigated and show the expected reduction in energy and frequency noise and extend the range of two eigenvalue soliton pulses up to 4900km at low bit error rates.