Design and evaluation of scheduling algorithms for TDM/WDM PON based on RSOA

This paper presents a scalable and costeffective hybrid time division multiplexing(TDM)/wavelength division multiplexing(WDM) passive optical network(PON), in which reflective semiconductor optical amplifiers(RSOAs) are used as optical network units(ONUs) and a shared tunable laser and photoreceiver stack locate at the optical line terminal(OLT). Especially,tunable transmitters are not only shared by all ONUs, but also used for both upstream and downstream transmissions. To solve resource contention problem and provide efficient bidirectional communications between the OLT and the ONUs, two novel algorithms are proposed to manipulate the wavelength accessibility and the burst scheduling. The performance of both algorithms in terms of the average packet end-to-end delay and throughput were simulated and evaluated.