João L. Rebola

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A new Gaussian approximation (GA) which takes into account the influence of arbitrary optical and electrical filters is proposed for the performance evaluation of optically preamplified receivers. Using the new GA, the receiver sensitivity is evaluated and notable performance differences were observed for several Fabry-Perot optical filters.
Four-level (quaternary) signalling in optical communication systems is investigated and the optimisation of quaternary signal level spacing is carried out considering signal-amplified spontaneous emission beat noise dominance. The optimised quaternary signal is propagated through an optical dispersive fibre and sensitivity improvements can be found for(More)
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