SENSITIVITY OF A DIRECT WDM-SYSTEM WITH A FREQUENCY-SELECTIVE OPTICALRECEIVER AND OPTICAL PREAMPLIFIER

We present an accurate model for the evaluation of the performance of a direct detection system with frequency selective Fabry-Perot (FP) fi lter and optical preamplification. The model includes the poisson stat istics of photodetection, a realistic model of the polarization behavi or of the amplified spontaneous emission and the: degradation of the s ystem due to intersymbol interference (ISI), The influence. of filtere d white noise is taken into account by the expansion in a set of ortho normal functions. We discuss the implementation of a polarization filt er for the rigorous model as well as the optimum bandwidth-bit duratio n (BT) product. The results confirm that the optimum bandwidth-bit dur ation product has a value of 6 for the discussed system.