Semiconductor Integrated Optics for Switching Light (Second Edition) provides concise description of the physics and engineering of semiconductor optical waveguides for photonic and electronic switching with a focus on optical communication applications. It provides Python notebooks that illustrate the concepts discussed in the book. The book includes the following topics: linear and nonlinear optics, linear electro-optic effect electroabsorption and electrorefraction, nonlinear refraction, nonlinear optical devices. Key Features Comprehensive introduction to the research literature on semiconductor integrated optics State of the art introduction into how this technology is deployed to make devices for optical communication systems Software - the Mathematica and Python notebooks which give the reader not only insight into how existing devices operate but also tools that can be used to design new devices Unique and cogent combination of fundamental physical principles and applications of semiconductor optical waveguides.