We base our study on a scalable optical asynchronous transfer mode (ATM) switch using a wavelength-division multiplexed (WDM) and space-division multiplexed (SDM) interconnection network. This switch uses an algorithm to achieve near 100% throughput but the delay is worse than that of an input-queued switch for low loads, and is significantly inferior to that of an output-queued switch for high loads. Another drawback is the difficult hardware implementation. The performance of this modified switch architecture is studied by numerical simulations. Under Uniform and Poisson input traffic, it achieves near 100% throughput and an average delay similar to that of an output-queued switch.
In this paper, we propose three methods of improving the performance of all-optical DWDM networks that employ light-path reservation. They are wavelength conversion, multiple fibers and two-path routing. We being by developing analytical models for static-routing networks based on the bidirectional Manhattan Street network (BMSN) and de Bruijn (DB) network topologies. Analytical results indicate that the multiple fibers approach yields the lowest blocking probability for BMSN topologies. In addition, one can achieve the greatest improvement in de Bruijn networks using either wavelength conversion or multiple fibers. The choice depends on the values of the parameters such as network load and reservation level. The two-path routing method offers moderate improvement in perfomrrance for the de Bruijn network topology. In addition, there exist optimum reservation levels for attaining minimum blocking probabilities. In the de Bruijn network, the advantage of the three schemes is modest. However, these schemes offer significant performance improvement for the bidirectional Manhattan Street network.
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