A 40Gb/s PAM4 optical DAC silicon microring resonator modulator transmitter. - Ashkan Roshan-Zamir; Binhao Wang; Kunzhi Yu; Shashank Telaprolu; Cheng Li; M. Ashkan Seyedi; Marco Fiorentino; Raymond G. Beausoleil; Samuel Palermo (MWSCAS, 2017)