Discrete Time Optical Signal Processing provides an introduction to the basic principles, enabling technologies, and methods for the analysis and synthesis and applications of optical filters that process signals in the time domain. These structures are finding increasing applications in the fields of broadband optical communications, sensing, radar, microwaves, and avionics. Researchers, engineers, and scientists with diverse backgrounds working in these fields require an updated and modern approach to the subject and this book is aimed at providing this coverage by exploiting the well known techniques of discrete time signal processing and applying them directly to the field of optical filters. In this way the interested reader is able to understand and master this technology while avoiding the complex formulation of classical optics. Both finite (FIR) and infinite impulse response (IIR) filters working in coherent and incoherent regimes are considered in this subject-focused text. TOC:Introduction.- Analysis Tools for Discrete Time Filters.- Fundamental Technologies and Components for Discrete Time Optical Filters.- Finite Impulse Response Optical Filters.- Infinite Impulse Response Optical Filters.- Measurements and Applications.