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Abstract
This article reports a numerical investigation of the performance of single-channel and WDM optical systems, assuming a fiber link 4000 km long in the presence of the Kerr effect, chromatic dispersion, and the amplifier spontaneous emission noise of the optical amplifiers. Both solitons and NRZ signals are considered, and IM-DD and coherent asynchronous ASK detections are used. Results on the technique of the midpoint spectral inversion are also reported.