This book compiles work which presents recent developments and progress made in optical fiber technology regarding newest range of optical communication, system and network, sensor, laser, measurement, characterization and devices. It gives emphasis to topics such as fiber lasers and fiber optic sensors, fiber measurement techniques, and fiber optic devices on silicon chips. The chapters within this book have been contributed by prominent academicians and scientists involved in state of the art research in the field of photonics. This work will serve as a reference for readers from both academics and industrial backgrounds.