Impact of fiber type and Raman pumping in NyWDM flexible-grid elastic optical networks

We analyse transparent wavelength routed optical networks using three different fiber types: NZDSF, SMF PSCF, and verify the effectiveness of Hybrid Raman/EDFA Fiber Amplification (HFA) with different pumping levels, up to the moderate 60% pumping regime. Nodes operate on the basis of flexible-grid elastic NyWDM transponders able to adapt the modulation format to the quality-of-transmission of the available lightpath, exploiting up to five 12.5 GHz spectral slots. Results consider a 37-node Pan-European network for variable Raman pumping level, span length and average traffic per node. We show that HFA in moderate pumping regime reduces the spectral occupancy for all three fiber types with particular evidence in NZDSF.