Performance Overview of the Quasi-Synchronous Operation Mode in Optical Burst Switching (OBS) Networks

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Optical Burst Switching (OBS) is able to operate under both asynchronous and synchronous burst departures. Although the asynchronous approach is generally assumed in OBS owing to its simplicity and low technical requirements, it has been shown that performance improvements, in terms of the overall burst loss probability, can be achieved under synchronous operation. Moreover, when effective contention resolution mechanisms are applied, such improvements are significant. Since perfect synchronization is not a viable solution, the authors propose a novel operation mode with relaxed technical requirements, the Quasi-Synchronous (QS) operation.