The author introduces WDM and its enabling technologies and discusses WDM local, access, metro, and long-haul network architectures. Its focus is on the networking aspects of optical networking, but it also includes coverage of physical layers in optical networks. Optical WDM Networks is a textbook for graduate level courses. While optics and electronics should be used appropriately for transmission and switching hardware, note that "intelligence'' in any network comes from "software,'' for network control, management, signaling, traffic engineering, network planning, etc.The role of software in creating powerful network architectures for optical WDM networks is emphasized. Research and development on optical wavelength-division multiplexing (WDM) networks have matured considerably.
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