This handbook provides comprehensive knowledge on device and system technologies for seamlessly integrated networks of various types of transmission media such as optical fibers and millimeter and THz waves to offer super high-speed data link service everywhere. The seamless integration of the knowledge of radio and optical technologies is needed to construct wired and wireless seamless networks. High-frequency bands such as millimeter-wave and THz-wave bands where super wideband spectra are available can offer high-speed data transmission and high-resolution sensing. However, the expected coverage is limited due to large wave propagation loss. Thus, convergence of radio and optical links is indispensable to construct worldwide networks. The radio and optical technologies share the same physics and are closely related to each other but have been developed independently. Therefore, there is a big gap between these two fields. Bridging the two fields, this handbook is also intended asa common platform to design integrated networks consisting of wireless and wired links.

Optical Access Technologies for Next-Gen Mobile Applications.- Coherent Optics for Access Networks: From P2P to P2MP.- Radio Access Network Convergence.- Quantum Key Distribution in Access Networks.- Introduction and History of Optical Transmission.- Optical Fiber and the Fiber Channel.-Optical Transceivers.- Optical Amplification.- Digital transmission systems.- Optical Networks and Interconnects.- Optical Switching Systems and Flex-Grid Technologies.- The Future of Optical Communications.- Propagation of Millimeter-Wave Fixed Wireless Backhaul/Fronthaul.- THz Propagation Simulator.- THz Propagation Experiment.- Millimeter-Wave Propagation of 5G Wireless Access.- 5G Wireless Access Experiment.