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System Optimization of High-efficiency 400 Gb/s PAM4 Silicon Photonics Transmitter for Data Center Applications. - Siamak Amiralizadeh Asl; Wenhua Lin; David Patel; Yann Malinge; Stefan Burmeister; Kadhair Al-Hemyari; Haijiang Yu; Jung Park; Christian Malouin; Kejia Li; Pengyue Wen; Xueyan Zheng; et al. (OFC, 2021)