Energy-Efficient 400G SDM Transmitter Based on DMT and a $1.3-\mu\text{m}$ Membrane DML-Array-on-Si

We report SDM transmissions based on DMT and a 4-channel membrane DML-array-on-Si. By simultaneously modulating all lasers, 200G (KP4-FEC) and 400G (SD-FEC) are demonstrated over 425-m MCF with ~6× power reduction compared to conventional DMLs.