We propose a routing and wavelength assignment algorithm for Optical Burst Switching (OBS) networks that utilizes
centralized control. First, a method that can estimate the expected total blocking time in the network is presented. Then
the proposed algorithm minimizes the estimated blocking time by simple iterative local optimization in terms of the
traffic demand between each pair of nodes. We demonstrate that the proposed algorithm attains much smaller blocking
probability than conventional distributed control algorithms. It is also shown that with introduction of optical buffers and
burst retransmission, the proposed method realizes low burst loss rates (<10-6) acceptable for most applications.
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