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Optical networks are currently widely employed to support a variety of telecommunications and other applications. In order to provide the increased bandwidth needed by the existing and emerging applications, optical networks rely extensively on Wavelength Division Multiplexing (WDM). In these networks, WDM is not only used to satisfy capacity requirements, but it can be also exploited to offer advanced features and functionalities such as service differentiation, varying QoS guarantees etc. This paper studies the use of WDM in core optical networks with focus on resilience issues.
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