Evaluation of Practical Coherent DSP Aspects on High-Baud Rate Submarine Systems Performance

In this work, we numerically investigate the impact of digital signal processing (DSP) stack implementation aspects on submarine systems using DP-QPSK, DP-8QAM, and DP-16QAM at 90 GBd. Results for different fibers showed a significant performance degradation when the practical DSP aspects were considered, especially for higher-order modulation formats. The achieved results highlight the importance of a more thorough analysis when designing the DSP algorithms, especially for the next generation of high-capacity optical systems.