A Performance Analysis of Deflection Routing and FDLs with Wavelength-Based QoS in OBS Networks

Abstract

In Optical Burst Switching Network, contention is one of the challenging problems. Contention occurs when more than one burst demand for same output wavelength channel in same time. The deflection routing, fiber delay line (FDL) and wavelength conversion are the methods used to resolve contention in OBS Networks. With deflection routing, contending bursts in send in another route rather than primary route towards it's destination. In this case of wavelength conversion if any contentions occur then one of the burst's wavelength have to be change from its current wavelength to another free wavelength channel. And, FDLs is usual used to provide an extra offset time for deflected burst since deflection route is commonly longer than primary one. This paper is propose a modeling analysis of deflection routing and FDLs with wavelength-based QoS management using Queueing theory to resolving contention problem in OBS Network. Analysis results show that proposed model reduce blocking probability in comparison with models before.