Generation and transmission of 21.4-Gbaud PDM 64-QAM using a high-power DAC driving a single I/Q modulator

We generate a single-carrier 21.4-Gbaud PDM 64-QAM signal (256.8-Gb/s line rate) using a single I/Q modulator driven by 8-level electrical waveforms from a novel high-power digital-to-analog converter. We demonstrate transmission over 400 km of ultra-large-area fiber.

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