%0 Journal Article %T Demonstration of 2 × ONU 80 Gbps direct detection colorless polarization division multiplexing frequency division multiplexing passive optical network uplink transmission %A Wang, Zhixin %A Xu, Yinfan %A Wang, Yanyi %A Wang, Yuanquan %A Chi, Nan %A , %J Optical Engineering %V 55 %N 4 %P 046113-046113 %@ 0091-3286 %D 2016-04-01 %I SPIE %~ DeepDyve