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Abstract
This is a semitutorial discussion of high-speed local area networks (LANs). We begin with a short introduction to the computer evolution from mainframes to LANs and characterize the latter in terms of three elements, namely, Topology, protocol, and transmission medium. After recalling the limitations encountered by electric LANs as they approach and surpass Gb/s data rates, we discuss two of the major problem that were recently faced in implementing those data rates with fiberoptic LANs, namely. branching losses and coupler directionality. We then proceed to show how these problem are now resolved with specific components, particularly, the erbium doped fiber amplifier (EDFA) and the electro-optical switchable coupler. We conclude with an analysis of two high-speed fiberoptic LANs, in open and closed loop topologies, that utilize these components.