Hybrid wavelength division multiplexing/time domain multiplexed (WDM/TDM) using radio over fiber technique with 16QAM at 2.5 Gbps

Abstract

There is growing demand for higher bit rates in the access domain due to the emergence of bandwidthhungry applications such as video-on-Demand and file sharing. Gigabit-capable passive optical network (GPON) is the most important PON. In a hybrid wave division multiplexing/time division multiplexing (WDM/TDM passive optical network (PON), Quadrature amplitude modulation (QAM) is proposed as a way to achieve the necessary high bit rates. In this paper, 2.5-Gb/s hybrid WDM/TDM downstream link is presented, using radio-over-fiber (RoF) techniques in the GPON network, where 16QAM is used at 2.4 GHz frequency. The result shows a good performance with a distance of 25 km for single mode fiber which serves up to 32 users. The analysis was made based on the performance of eye and constellation diagrams.