Wavelength division multiplexing (WDM) optical network has emerged as the transmission technology for the next generation Internet backbone. In WDM networks, the huge bandwidth offered by fiber is managed by splitting it into a number of wavelengths, each acting as an independent communication channel at Gbps data rate. One of the key issue in OBS networks is efficient scheduling. Basically there are two types of scheduling algorithms, horizon scheduling algorithm and void filling scheduling algorithm used for scheduling in OBS network. If we calculate burst drop probability before scheduling...