Dispersion Tolerant 66.7-Gb/s SEFDM IM/DD Transmission Over 77-km SSMF

We demonstrate a 66.7-Gb/s 4-QAM optical SEFDM IM/DO transmission over 77-km SSMF, simultaneously achieving a spectral gain of up to 65.5% and a superior immunity against chromatic dispersion effects in comparison with conventional OFDM transmission.