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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-DACs, and an analog multiplexer (AMUX). We...
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