This is an introductory course for optical networks. Both the technologies and network aspects will be examined. We will study the enabling technologies, such as the light propagation in the optical fiber, the nonlinear effects, optical components, modulation/de-modulation, optical switching, and transmission system. The optical network design and engineering will be extensively studied, e.g., WDM network ele-ments, routing and wavelength assignment algorithms, blocking probability analysis, virtual/physical topology design, network control and management, survivability, optical access, and IP over WDM.