We experimentally compared 128 and 256-GSa/s DACs using partial response signaling. Transmission of 310-GBd OOK is demonstrated with a single 128 GSa/s DAC for up to 5-km without optical amplification (net 268.84Gb/s, AIR ≈ 300Gb/s).
We have experimentally shown that probabilistically shaped PAM-8 improves receiver sensitivity by more than 1 dB compared with regular PAM-8 for data rates beyond 200 Gbit/s.
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