Experimental demonstration of the OQAM-OFDM-based wavelength stacked passive optical networks

We demonstrate a wavelength stacked passive optical network (PON) with offset quadrature amplitude modulation based orthogonal frequency division multiplexing (OQAM-OFDM), which can provide 100-km single mode fiber (SMF) transmission without any inline repeater amplifier for both downlink and uplink. By experiment, we verify the feasibility of this proposed PON system for bi-directional long distance transmission especially for asynchronous upstream. Experimental result shows that, negligible power penalty is achieved even with 100-km SMF transmission, and ~3.6-dB sensitivity improvement is obtained when compared to OFDM-based asynchronous system. Besides, the performance in terms of side-lode suppression and peak to average power ratio (PAPR) are also contrastively analyzed between OFDM and OQAM-OFDM-based PON system.