Optical Networks and WDM: High-Capacity Transport in Modern Telecom explores the technologies, architectures, and innovations driving the evolution of optical communication systems. Covering key concepts such as wavelength division multiplexing (WDM), optical components, transmission techniques, and network design, the book provides a comprehensive understanding of how high-capacity optical infrastructure supports modern data demands. With in-depth analysis of both legacy systems and emerging trends like SDN, photonic integration, and quantum networking, this resource is essential for engineers, researchers, and students seeking to master the principles and applications of next-generation optical networks.