# Discrete Multitone Transmission at Net Data Rate of 250 ${\text{Gb/s}}$ Using Digital-Preprocessed Analog-Multiplexed DAC With Halved Clock Frequency and Suppressed Image

#### Abstract

We demonstrate the first single-lane intensity-modulated direct-detection (IMDD) optical transmission at a net data rate of 250 Gb/s. A discrete multi-tone (DMT) signal at a gross line rate of 300 Gb/s can be generated with a digital-preprocessed analog-multiplexed digital-to-analog converter (DP-AM-DAC), which consists of a digital preprocessor, two sub… (More)