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—We propose an efficient stratified sampling algorithm for estimating the bit error rate (BER) of a digital communication system. Our algorithm efficiently exploits the observations of an approximate, but usually fast, model of the system under investigation to drive a clever Monte Carlo estimation based on stratified sampling. The proposed method is faster(More)
We compare by simulation the performance of 100 Gbit/s PDM-iRZ-QPSK and PS-QPSK transmission both in homogeneous and hybrid QPSK/OOK DM links. We detail the reasons of the overall performance investigating each nonlinear effect (SPM, XPM and XPolM) individually. Moreover, we compare the accuracy of the noise loading method with the more realistic use of(More)
We propose a novel load-aware power-selection strategy for maximizing the transparent reach in dispersion-uncompensated flexible optical networks with coherent modulation formats, and we quantify the savings in opto-electronic regenerations with respect to using the standard full-load transparent reach.
New semi-analytic formulas of the power spectral density (PSD) of single- and cross-channel nonlinear interference (NLI) in coherent optical links for which the Gaussian Noise (GN) model applies are presented. From the PSD, a new bound on cross-channel NLI power is obtained. The new formulas are useful to both quickly compute single- and cross-channel NLI(More)
—Flexible grid optical networks allow a better exploitation of fiber capacity, by enabling a denser frequency allocation. A tighter channel spacing, however, requires narrower filters, which increase linear intersymbol interference (ISI), and may dramatically reduce system reach. Commercial coherent receivers are based on symbol by symbol detectors, which(More)
We provide an analytical expression of the nonlinear phase induced by the Kerr effect that highlights its dependence on the modulation format and on the link parameters. We show that such a nonlinear phase must be used in regular-perturbation models in order to minimize their modeling error. We detail the case of dispersion-managed systems as an application(More)
—Flexible grid optical networks allow a better exploitation of fiber capacity, by enabling a denser frequency allocation. A tighter channel spacing, however, requires narrower filters, which increase linear intersymbol interference (ISI), and may dramatically reduce system reach. Commercial coherent receivers are based on symbol by symbol detectors, which(More)
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