Design and Performance Analysis of Deflection Routing Based Intelligent Optical Burst Switched (OBS) Network

Optical burst switching (OBS) is a promising switching technology for realization of terabit optical network. However, the lack of optical processing capability results in increased blocking probability and limits the network performance. Efficient contention resolution is therefore necessary. Optical burst-switched networks are usually implemented using efficient contention resolution protocols like deflection routing, however deflection routing approach resolves the congestion by exploiting alternate available paths and utilizes the resources effectively. If contention is resolved by traditional deflection routing then there is no guarantee that the control packet will be able to reserve all the wavelengths successfully up to the destination on the alternate path, especially in a high traffic load situation. The present paper proposes a scheme of deflection routing by assigning suitable wavelengths to various routed paths based on respective traffic to be routed. A mathematical model for the same has been developed and the network performance has been simulated using MATLAB to establish congestion performance of the proposed scheme.