This paper presents a comprehensive analytical framework for evaluating
filtering penalties in ASE-noise-limited coherent optical links. The model
accounts for the cumulative effects of cascaded optical filters,
amplifier-induced ASE noise, and transceiver noise, alongside digital
equalization at the receiver. By developing a generalized channel
representation, we derive closed-form expressions for signal-to-noise ratio
degradation under various equalization strategies, including Zero-Forcing
Equalizer, Minimum Mean Square Error Equalizer, and Fractionally Spaced
Equalizer. These models capture the impact of colored noise resulting from
linear filtering and provide both time and frequency-domain insights. The
proposed framework is validated through experimental comparisons using
accurately modeled optical filters, demonstrating close agreement between
theory and practice and offering a robust foundation for system-level
performance evaluation in metro-access networks.

Cet article explore les excursions dans le temps et leurs implications.

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