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We experimentally demonstrate a single-carrier 400G solution based on 51.25-GBaud PDM-32QAM signal at 6.15-b/s/Hz SE over 1200-km transmission distance. Training assisted pre-compensations and both transmitter and receiver based look-up table are employed to mitigate channel bandwidth constraint and component nonlinearity impairment.
For the first time, bandwidth-efficient iOÖ+G/λ IMDD optical links based on Nyquist 256QAM is proposed and demonstrated. With innovative fast-converging blind equalization and nonlinearity compensation algorithms, 160-Gbps gross line rate over 2-km SMF is achieved.
We demonstrated 4-channel high level QAM-DMT transmission over 20-km SMF-28 with real-time reception. 58.72-Gb/s 256QAM-DMT and 56.4-Gb/s 128QAM-DMT signal transmission within 25-GHz grid is achieved with the BER under 2.4×10−2 and real-time reception.
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