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Designed for a one-semester course on fiber-optics systems and communication links, this book provides a concise but rigorous treatment of the theory behind analog and digital fiber-optics links and system issues. Attention is paid both to the digital links prevalent in traditional telecommunication networks and to the analog links important in cable modem distribution networks for Internet service distributions. Problems such as the effects of dispersion and interferometric noise are described and quantified and the means of mitigating them are explained. This broad but concise text will thus be invaluable not only to students of fiber-optics communication but also to practicing engineers.