An asynchronous WDMA protocol without collisions for ring MANs: Study for Internet traffic packet size variation

This study presents a wavelength division multiplexing multi-ring architecture for metropolitan area networks (MANs). An asynchronous transmission WDMA protocol is introduced that serves the variable size of Internet packets in nowadays ring MANs under asymmetric traffic scenarios. Especially, the proposed WDMA protocol takes under consideration the time sensitivity of Internet traffic and each time instant allows the transmission of variable size packets that do not collide over the WDM channels and at destination. In this way, the proposed access scheme is totally collisions-free, while it ensures optimal fiber bandwidth exploitation, especially under high offered loads. Also, dropping probability and total delay experienced reduction is achieved, while throughput improvement is obtained that reaches almost 300% as compared with other relative protocol. The proposed network architecture manages high scalability and maintenance since it exploits the transceivers tunability benefits to use all wavelengths for both transmission and reception. Finally, a simulation model based on Poisson traffic statistics is developed for the performance measures evaluation.