Performance Analysis of Asynchronous Optical Burst Switching Networks

The ever increasing demand for higher bandwidth due to the growth of bandwidth intensive applications such as video-on-demand, video conferencing, on-line banking, on-line auction and other multimedia applications motivated the search for alternatives to traditional electronic networks. Optical Burst Switching (OBS) is one such paradigm developed to handle the future bandwidth demands for next-generation optical Internet. Quality-of-service (QoS) provisioning is an essential feature in next-generation networks. This paper aims at providing loss-free transmission inside the OBS network for guaranteed bursts and also to utilize wavelength efficiently. This QoS approach called Link Based QoS Provisioning (LQP) is accomplished by efficient Routing and Wavelength Assignment Scheme. It is discussed for Asynchronous and Synchronous case depending on number of paths and number of available wavelengths. In Asynchronous LQP, each path is assigned with one or more wavelength in order to establish non-overlapping paths between each pair of edge node. On the other hand, in case of Synchronous LQP only limited number of wavelengths is available, hence often paths overlap. The best routing path is selected and wavelength is assigned to the pertaining path, to provide loss-free transmission inside the OBS network. This is carried out for efficient utilization of wavelength. Keywords— Integer linear programming, Optical burst switching (OBS), Quality-of-service (QoS) provisioning, routing, wavelength assignment.