A Novel Contention Resolution Scheme of Hybrid Shared Wavelength Conversion for Optical Packet Switching

Abstract

Wavelength conversion is an efficient way to improve the optical packet blocking performance for all-optical packet switching networks. The synchronous OPS node architecture, with a hybrid shared wavelength conversion (HSWC) scheme based on shared per output fiber and shared per node wavelength conversion, is put forward to reduce the packet loss probability in this paper. A heuristics is developed into assigning the wavelength channels for packets in the proposed optical nodes. The limited range wavelength converters first available (LFA) algorithm and parametric wavelength converters first available (PFA) algorithm are used to schedule contending optical packets to available wavelength channels. Simulation results show that the hybrid shared wavelength conversion scheme has significant performance improvement in terms of packet loss probability. And the utilization of wavelength converter is greatly improved for OPS node with hybrid shared wavelength conversion scheme. Furthermore, the PFA scheduling algorithm compared with LFA algorithm is validated to improve the wavelength assignment efficiency and reduce the required total wavelength converters for OPS nodes.