This book originated from a lecture of the same title, which was held for electrical engineering students after their preliminary diploma, focusing on "Technical Electrophysics" over a number of years. The book reflects the current state of this lecture. It has been partially developed by the authors under the influence of their own early works. Notable contributions in this regard come from Dr. Ing. R. Müller (Chapter 3), Dr. Ing. R. Schiek (Chapter 5), and Dr. Ing. G. Trommer (Chapters 2 and 4). The book is aimed at electrical engineers and physicists after their preliminary diploma, as well as anyone working in the field of integrated optics who wishes to gain a deeper understanding of the theoretical foundations of their area. Munich, September 1989 The Authors Table of Contents 1 Introduction 3 2 Dielectric Waveguides 7 2.1 Film Waves 10 2.