Comparative Analysis of Wavelength Conversion and Segmentation Based Dropping Method as a Contention Resolution Scheme in Optical Burst Switching (OBS) Network

Abstract

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. OBS networks are usually implemented using efficient contention resolution protocols like wavelength conversion, burst dropping etc. Wavelength conversion is the process of converting a wavelength on an incoming channel to another wavelength on the outgoing channel. In burst segmentation dropping scheme, rather than dropping the entire burst during contention, the burst may be broken into multiple segments, and only the overlapping segments are dropped. Comparative analysis between wavelength conversion and segmentation-based burst dropping techniques in optical burst switched network has been presented in this paper. Appropriate mathematical models have been developed to calculate call connection probabilities for both the techniques and results are validated through proper simulations