optical networking and related technologies, network management and services have experienced tremendous growth, and the network backbone network now ultra-high speed for communication. This book provides a comprehensive overview of techniques used in designing efficient WDM network for dissemination of information in computer networks. It begins with a description of hardware components, then give a thorough review of WDM, wavelength-routed networks, algorithms for routing and wavelength assignment, design of broadcast and select networks, logical topology design, and techniques for handling errors and an efficient algorithm network usage optics. This book is intended for beginners and also for specialists, and readers should be able to design WDM networks and follow developments in the field.