Abstract
For local area networks, bus topologies are the most preferred ones because of the reliability and the simplicity offered by them. However, it is difficult to construct a fibre optic bus network due to two main reasons (i) non availability of high impedance bidirectional taps and (ii) unidirectional nature of light propagation in fibres. This paper examines in detail the issues involved in implementation of optical fibre bus networks. It evaluates various major schemes that have been proposed towards this end and finds out the optimum implementation for each one of them. Every implementation has certain constraints on the number of nodes that can be supported for the available power budget. Other pertinent issues like the required dynamic range, reliability, expansion capabilities and the protocols supported are also discussed. Amongst the various implementations examined, the one using star couplers and linear bus with asymmetric coupler appear to be superior to the others.
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