Fiber optics is a technology that uses glass or plastic fibers to transmit data. A fiber optic cable consists of a bundle of glass threads capable of transmitting messages modulated onto light waves. We are currently in the midst of a huge transition from copper cabling to fiber optics for large-scale communications networks. This book covers two of the Electronic Technician's Association's leading certifications: Fiber Optics Installer (FOI) and Fiber Optics Technician (FOT). Sybex developed this book in conjunction with ETA to serve as both a comprehensive self-study course and a useful desk reference.