Eugenio Iannone has been researching optical communication systemsand networks at the Fondazione Ugo Bordoni in the OpticalCommunication Group for more than a decade. He is coauthor ofCoherent Optical Communications Systems (Wiley, 1995). Francesco Matera researches optical fibers and optical local areanetworks at the Fondazione Ugo Bordoni, Optical CommunicationGroup. Antonio Mecozzi has been with the Optical Communication Group atFondazione Ugo Bordoni for more than a decade. Marina Settembre researches optical devices for signal routing andprocessing, and numerical modeling of pulse propagation along fiberlinks.