This book presents the principles of non-linear integrated optics.The first objective is to provide the reader with a thoroughunderstanding of integrated optics so that they may be able todevelop the theoretical and experimental tools to study and controlthe linear and non-linear optical properties of waveguides.The potential use of these structures can then be determined inorder to realize integrated optical components for light modulationand generation. The theoretical models are accompanied byexperimental tools and their setting in order to characterize thestudied phenomenon. The passage from theory to practice makes thecomprehension of the physical phenomena simple and didactic.The book also gives a presentation of the industrial applicationsof the integrated optical components. The studied topics range fromthe theory of waveguides and the linear and non-linear opticalcharacterization techniques to photonic crystals. This last fieldconstitutes a major challenge of photonic technologies of the 21stcentury.