Analog 112 Gb/s PAM-4 modulation over 10 km SSMF using EML and duo-quaternary detection for low-cost data center solutions

We show through simulations and experimentally that 112 Gb/s PAM-4 may be transmitted DAC-less using a 28 GHz EML and a novel duo-quaternary detector. Experimental results show that standard FFE/DFE equalization outperforms this technique indicating that it is more suitable for use with a high-speed DAC. Nevertheless, 2 km and 10 km transmission experiments indicate below-FEC performance.