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The last few years have seen a wealth of new nonlinear propagation modeling results appear in the literature, especially regarding coherent systems operating in the absence of optical dispersion compensation. One of the most prolific lines of research, though not the only one, has been that of improvements and upgrades to the Gaussian-noise (GN) model, which have also led to the so-called enhanced...
We apply DBP to an experimental WDM system where multisubcarrier transmission provides a 12% reach gain vs. single-carrier. DBP provides further gain for both single- and multisubcarrier systems but significantly underperforms ideal theoretical predictions.
We investigated the reach increase obtained through non-linearity mitigation by means of transmission symbol rate optimization (SRO). First, we did this theoretically and simulatively. We found that for PM-QPSK systems at full-C-band the reach increase may be substantial, on the order of 10%–25%, with optimum symbol rates on the order of 2-to-6 GBaud. We extended the investigation to PM-16QAM, where...
We investigate the reach-increase obtained by optimizing the transmission symbol rate. We show that for PM-QPSK systems at full-C-band the increase may be larger than obtained through ideal single-channel backward-propagation, and similar for PM-16QAM.
Thanks to the use of a digital multi-subcarrier architecture, we experimentally demonstrate a maximum reach increase of 11% for a 19×128Gbit/s PM-QPSK WDM comb with respect to an equivalent single-subcarrier system, achieving 14,100-km transmission over PSCF fiber with EDFA-only amplification.
We investigate the dependence of maximum system reach on symbol rate. We identify a suitable modeling framework and derive a closed-form formula for the optimum rate, typically 2-to-10 GBaud. Maximum reach gains are between 5% and 20%.
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