Mitigation of the Interference Between Odd and Even Terms in Optical Fast OFDM Scheme Based on Interleaved Multiplexing

In this letter, the modulation and demodulation mechanisms of the discrete Fourier transform-based optical fast orthogonal frequency-division multiplexing (F-OFDM) scheme have been examined. Analysis shows that there exists an interference term between even and odd subcarriers in this F-OFDM scheme, which has severe impact on system performance, especially when the subcarrier number is small. We propose a zero-subcarrier-based method and numerically investigate the effectiveness of the method with different number of subcarriers. Simulation results show that the approach can greatly mitigate the interference in DFT-based F-OFDM scheme.