Supplement 1: Monolithic 56  Gb/s silicon photonic pulse-amplitude modulation transmitter XiongChi GillDouglas M. ProeselJonathan E. OrcuttJason S. HaenschWilfried GreenWilliam M. J. 2016 Supplemental Material Originally published in Optica on 20 October 2016 (optica-3-10-1060)