ELECTRICAL FILTERING STRATEGIES TO COMPENSATE WAVE-FORM DISTORTION INOPTICALLY AMPLIFIED IM DD SYSTEMS/

Postdetection filtering strategies are investigated as a means of comp ensating the waveform distortion caused by the combined effect of chro matic dispersion and self-phase-modulation in intensity modulated, dir ect detection (IM/DD) systems. A design technique based on realisable filter models and a rigorous performance evaluation is introduced. In addition, a method of finding the theoretical optimum filter is given, providing a measure of the achievable system performance and the effi cacy of the various filtering strategies. It is shown that the optimis ed postdetection filtering is effective in reducing the system power p enalty, and the relative merits of different filters are quantified. T he optimised filters are also shown to be tolerant to various system i mpairments, such as noise, timing jitter and perturbation of filter pa rameters.