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We report on the experimental demonstration of single channel 28 Gbaud QPSK and 16-QAM zero-guard-interval (ZGI) CO-OFDM transmission with only 1.34% overhead for OFDM processing. The achieved transmission distance is 5120 km for QPSK assuming a 7% forward error correction (FEC) overhead, and 1280 km for 16-QAM assuming a 20% FEC overhead. We also demonstrate the improved tolerance of ZGI CO-OFDM to residual inter-symbol interference compared to reduced-guard-interval (RGI) CO-OFDM. In addition, we report an  8-channel wavelength-division multiplexing (WDM) transmission of  28 Gbaud QPSK ZGI CO-OFDM signals over 4160 km.

Single channel and WDM transmission of 28 Gbaud zero-guard-interval CO-OFDM