Demonstrations of 10 and 40Â Gbps upstream transmissions using 1.2Â GHz RSOA-based ONU in long-reach access networks

► Optical OFDM modulation is applied in 1.2 GHz bandwidth RSOA first. ► 10 Gb/s upstream from RSOA in long-reach transmission is first proposed. ► 4 × 2.5 Gb/s and 4 × 10 Gb/s upstream traffics in a LR-PON have been analyzed and compared.