Publisher Summary Optical Fiber Telecommunications V (OFT V) is the fifth installment of the OFT series. The OFT series is a compilation by the research and development community in optical fiber communications. Each edition reflects the state-of-the-art technology of the time. This chapter provides an overview of OFT V volume A, components and subsystems, and volume B, systems and networks. Although each edition has added dimensions, it is also true that new challenges emerge as they relate to older PLCs. Certain devices may have adequately solved the transmission problems of the systems of that era. However, as systems become more complex, critical device technologies that might have been considered a “solved problem” previously have new requirements placed upon them and need a fresh technical treatment. For this reason, each edition has grown in sheer size—adding the new and, if necessary, reexamining the old.