New approach demonstrates improved optical-to-noise ratio in digital-subcarrier-multiplexing, suggesting enhanced transmission quality.
We propose a multiplication-free K-state reserved complex maximum-likelihood-sequence-estimation (MLSE) to mitigate asymmetrical filtering impairments in digital-subcarrier-multiplexing transmissions. A required optical-to-noise ratio of 1.63dB over the conventional real MLSE is obtained after transmitting 90 GBaud DSCM DP-16QAM signal over 14 WSSs without multiplications.
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Jiang et al. (2025) studied this question.
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