This book has five parts. The first chapter introduces and evaluates fiber optics for contemporary communication. Chapter two shows fiber optic network components, propagation modes, and dispersion. This chapter covers several optical amplification methods. The third chapter covers optical network transmission, modulation and demodulation, transmitter and receiver parts, multiplexing techniques, and optical cable and connector types. Chapter four also covers passive optical networks, point-to-point and point-to-multipoint networks. This chapter clarifies optical network-based topology types. Finally, the final chapter will demonstrate future optical-based network issues and solutions.