[2] [2] KHONINA S N, KAZANSKIY N L, BUTT M A, et al. Optical multiplexing techniques and their marriage for on-chip and optical fiber communication: a review[J]. Opto-Electronic Advances, 2022, 5(8): 210127.

[5] [5] ZHOU Ji, LI Liangchuan, HE Jiale, et al. Clipping discrete multi-tone for peak-power-constraint IM/DD optical systems[J]. Science China Information Sciences, 2023, 66(5): 152302. DOI: 10.1007/s11432-022-3555-y.

[6] [6] CHEN Zhuo, DAI Xiaoxiao, NIE Junyuan, et al. Complexity curtailed MLSE equalizer based on a compact look-up-table for C-band DSB IM/DD transmission[J]. Optics Letters, 2022, 47(21): 5606-5609. DOI: 10.1364/OL.475764.

[10] [10] KALLA S C K, GAGN C, ZENG M, et al. Recurrent neural networks achieving MLSE performance for optical channel equalization[J]. Optics Express, 2021, 29(9): 13033-13047. DOI: 10.1364/OE.423103.