DAC-less and DSP-free PAM-4 Transmitter at 112 Gb/s with Two Parallel GeSi Electro-Absorption Modulators
We present a novel integrated PAM-4 modulator based on the vector addition of 2 binary driven parallel GeSi electro-absorption modulators. Clear open eyes at 56 GBaud up to 2 km of SSMF without any DSP are demonstrated.