Figure 4. Q2(dB) vs. per channel transmitted power (dBm) plots
As we can see from the blue and red curves of Fig. 4, the GN-model approach, while cutting the simulation time by almost one-third, does not introduce any significant penalties compared to the time-consuming simulation of the layout with fiber-amplifier spans. Even the noise-loading approach (green curves), at the optimal per channel power, has negligible penalty of approximately 0.25 dB in our case.
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