Optical fiber and space communications are key techniques for high capacity point-to-point links and broadband networks which are prerequisites for advanced interactive multimedia communications. This book describes the relevant components and systems. It is focussed on analysis, design, optimization and application aspects. This would be a valuable text for an introductory level as well as for a senior level course to engineering students. The practicing engineers and physicists will find it useful to update their knowledge in the field. In addition, this book will also serve as a working reference in the selection and design of optical communication systems.