Based on the classical electromagnetic field theory and modern optics, this book systematically elucidates the basic principle of light wave, law and characteristic of light wave transmission, design and development of optical devices, and main applications of light wave technology. The book consists of five parts, respectively on Foundation, Movement, Power, Device and Application. The Foundation part includes the basics of light wave, light wave analysis method and optical transmission dielectric waveguide. The Movement part includes Kinematics equations of light waves, optical transmission in isotropic media, optical transmission in anisotropic medium and periodic medium. The Power part includes equation of wave dynamics, light waves interacting with external fields, and light waves interacting with each other. The Device part includes R&D of optical waveguide regulatory device and optical waveguide device. The Application part includes the applications of optical measurement technology, optical communication technology and optical sensing technology.