This new book focuses on area of integrated optics which is an emerging technology. This book includes the basic concept of a micro ring resonator and its characteristics. The generalized approach of the device design is described, and some cases of applications are provided. The nonlinear aspect of the micro ring resonator is also analyzed; there are some cases of applications provided. Evolving technologies in communications, quantum communication, nonlinear communication, ultra-fast switching and soliton switching, quantum chaotic and solitons are discussed.