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The book gives an in-depth description of key devices of current and next generation fibre optic communication networks. Devices treated include semiconductor lasers, optical amplifiers, modulators, wavelength filters and other passives, detectors, all-optical switches, but relevant properties of optical fibres and network aspects are included as well. The presentations include the physical principles underlying the various devices, technologies used for their realization, typical performance characteristics and limitations, but development trends towards more advanced components are also illustrated. This new edition of a successful book was expanded and updated extensively. The new edition covers among others lasers for optical communication, optical switches, hybrid integration, monolithic integration and silicon photonics. The main focus is on Indium phosphide-based structures but silicon photonics is included as well. The book covers relevant principles, state-of-the-art implementations, status of current research as well as expected future components.
Most of the materials evaluated in this volume are poorly soluble solid materials that are deposited in particulate form in the lung where they may be retained for long periods. In this respect, they should be considered as 'particulate toxicants'. Cobalt and cobalt compounds were formerly evaluated as being possibly carcinogenic to humans and the evidence was inadequate. Since that time new epidemiological studies have been conducted and are evaluated here. No new studies in experimental animals were available for cobalt compounds used in the hard metal industry. Nevertheless, this volume re-evaluates some of the experimental evidence for cobalt that was presented previously. The Working Group questioned the relevance of the routes of administrationused in some of the animal carcinogenesis bioassays for the evaluation of carcinogenicity of cobalt metal and cobalt alloys. The bioassays were reviewed again in this volume.