Multi-band OFDMA based passive optical network with windowing technique for asynchronous multiple access

Multi-band OFDMA PON with windowing technique is proposed for asynchronous multiple access. In the asynchronous multiple access system, frequency orthogonality is not maintained among OFDM bands, and it leads to inter-band interference arisen from OFDM sidelobe. To mitigate this effect, raised cosine window is applied to suppress the sidelobe. The proposed system is experimentally compared with conventional Multi-band OFDMA PON according to different roll-off factor of raised cosine window.