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On the performance of multichannel digital backpropagation in high capacity long haul optical transmission

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Figure

Fig. 1. Simulation schematic of 5×32 Gbaud Dual-Polarization (DP)-16QAM superchanneltransmission with two different DSP schemes: (a) with full sampling rate DBP and (b) with limitedsampling rate.
Fig. 2. Q2 factor vs. launch power per channel after 3206.8 km transmission with varyingbackpropagated bandwidth around the central channel
Fig. 4. Q2 factor optimization in number of steps per span and DBP nonlinear parameter γBP for (a)single channel case, (b) 3 channels and (c) full-field DBP
Fig. 5. Superchannel spectrum digitised at frequency Fs equal to (a) the Nyquist rate (sampling rateequal to signal bandwidth) and (b) twice the Nyquist rate.
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