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Starting with the nature of information, it goes on to explain all the ideas behind information measurement, signals, digital coding, modulation, optical transmission along fibres, optical detectors, demodulation, system design, networking and non-linear optics. A final chapter, on more advanced topics, brings the reader up-to-date with recent developments. This is an introductory-level book for sales and marketing personnel, business managers in telecommunications, technicians and college or university students interested in the ideas behind the telecommunications medium of the future. No more than GCSE physics is required.