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

There is growing demand for higher bit rates in the access domain due to the emergence of bandwidth-hungry 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. Key words: Hybrid wavelength division multiplexing / Time domain multiplexed -passive optical network (WDM/TDM-PON, radio-over-fiber (RoF), Quadrature amplitude modulation (QAM) modulation.