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Slotted Aloha protocols for high-speed optical fiber local area networks using WDM passive star topology

Five protocols based on slotted Aloha are proposed for very high-speed optical fiber local area networks using wavelength division multiplexing passive star topology. Each station is equipped with a tunable optical transmitter for data channels, a fixed optical transmitter tuned at a separate control channel, a tunable optical receiver and a fixed optical receiver. To obtain high success probability in the transmission of a control packet determining the transmission of its data packet, the control minislot group is introduced. The performances of five protocols are compared under various system parameters. Numerical results show that the protocols presented have better performance than the corresponding protocols.