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We propose a scheduling algorithm minimizing voids generated by arriving bursts in an optical burst switched WDM network. In the proposed scheduling algorithm, when the burst which has arrived at an optical core router at a certain time can be transmitted in some data channels by using unused data channel capacity (called a void), our proposed scheduling algorithm selects the data channel in which a void newly generated after the burst transmission becomes minimum. We compare, by computer simulations, the performance of our proposed scheduling algorithm with that of the conventional one with respect to burst loss ratio. It is shown that our proposed algorithm can improve burst loss ratio.