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We perform a systematic numerical optimization of pre- and post-compensation normalized sections using standard and dispersion compensating fibers for non-return to zero 10-Gbits/s single channel systems. By independently varying the power at the different types of fibers inputs and the compensation ratio, we find that the post-compensation performs better than precompensation at the expense of stricter parameter tolerance. Moreover, we show that both pre- and post-compensated systems can be significantly improved by using passive predistortion at the transmitter.