This textbook is designed for senior undergraduate and first year graduate students in eletrical engineering departments taking photonics, optoelectronics or optical communications courses. The text covers key subjects in optical electronics and their applications in modern optical communications where optical waves are used as carriers of information for local and long distance transmission. This new edition of Amnon Yariv's classic titles offers more explanations of mathematical derivations to help undergraduate students, and focuses more on course topics than on research applications. This book is part of the Oxford Series in Electrical and Computer Engineering (OSECE).