Increasing the number of connectable ONUs with subcarrier digital modulation passive optical network

PON (Passive Optical Network) technologies are applied to FTTX in order to provide high-speed Internet services. Currently, TDM-PON (Time Division Multiplexing PON) has been deployed widely. However, TDM-PON faces difficulty to control upstream traffic with optical level multiplexing in case of transmission rate grager than 10 Gbps because of performance limitation of the optical burst multiplexing. In order to release the limitation, we have proposed SDM-PON (Subcarrier Digital Modulation Passive Optical Network) that does not require the optical burst multiplexing. In this paper, we improve SDM-PON mechanisms in order to increase the number of connectable ONUs (Optical Network Units) up to 32 in one OLT with realizing low power consumption. We evauate transmission performance with simulations to confirm 32 ONUs enable to communicate simultaneously in realistic conditions.