Two orthogonal carriers assisted 82-Gb/s dual-band DDO-OFDM transmission over 320-km SSMF

We propose a fading-free direct detection method for transmission of complex-value OFDM signal in metro distances. By using two orthogonal optical carriers, an 82-Gb/s dual-band transmission is demonstrated over 320-km SSMF within only 30-GHz electrical bandwidth.