Abstract
Dense Wavelength Division Multiplexing (DWDM) is adopted in large data communication systems as a practical solution to problems of fiber exhaust. It offers new high availability services with fault recovery at the physical layer that are not based on Synchronous Optical Network (SONET) infrastructure. DWDM has also enabled new computer architectures such as parallel sysplex, and made it practical to implement real-time disaster recovery and data mirroring at extended distances. New datacom network topologies are also enabled by DWDM coupled with flexible network management and security. The chapter describes the dominant approaches to data storage and coupled parallel sysplex processors using optical fiber connectivity and datacom protocols. It discusses the usage of DWDM in large data communication systems, including specific examples of current and next-generation DWDM devices and systems. Technical requirements, network management and security, fault tolerant systems, new network topologies, and the role of time division multiplexing in the network is also presented in the chapter. Furthermore, the chapter explores future directions for the DWDM technology.
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