Improving Nonlinearity Tolerance of PCS-QAM Digital Multi-Carrier Systems Through Symbol Rate Optimization

We experimentally demonstrate that symbol-rate optimization (SRO) provides nonlinear gains in multicarrier systems, even with PCS modulation and realistic DSP. Optimized carrier phase recovery is crucial to achieving 0.2 dB gain for 1400 km 800G transmission, out of the ∼0.7 dB theoretical maximum gain we measured.

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