20Â Gb/s WDM-OFDM-PON over 20-km single fiber uplink transmission using optical millimeter-wave signal seeding with rate adaptive bit-power loading

► Spectral-efficiency achieved using OFDM-based signal. ► Optical carrier suppression method with single laser to double the capacity. ► Single fiber loopback link with colorless ONU realized using RSOA. ► Optimizing the BER and data rate using rate adaptive bit-power loading algorithm.