The book of well-known American experts discusses the propagation of electromagnetic waves in periodic media, the theory of waveguide modes in dielectric waveguides and in fibers, the theory of propagation of surface polaritons, etc. The basics of nonlinear optics and the phenomenon of optical phase conjugation are also presented. Much attention is paid to the theory of propagation of electromagnetic waves in crystals exposed to external influences. Can be used as a tutorial. For physicists and engineers working in the field of quantum electronics, integrated optics and fiber-optic communication lines, as well as for undergraduate and graduate students.