A selfconsistent solution is derived for an interoffice ring network consisting of a cascade of 11 erbium-doped fibre amplifiers that closes on itself and amplifies 15 wavelength-multiplexed signals. The accumulated signal-to-noise ratio is sufficient for 10Gbit/s operation at each wavelength, allowing a network capacity of 550Gbit/s for a full mesh traffic pattern.
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Elrefaie et al. (1992) studied this question.