Low-Speed DSP Assisted Dispersion Compensation-Free IM/DD Optical OFDM Transmission Over 100 km-SMF using Time- and Frequency-Domain Sparse-Subcarrier Multiplexing

Time- and frequency-domain sparse-subcarrier IM/DD optical OFDM system is proposed for dispersion-tolerant transmission. We show a BER improvement for four-subcarrier × 10 Gb/s/subcarrier OFDM, using duo-binary coding and MLSE over 100-km transmission without dispersion compensation.