The transmission performance in WDM-systems is different for the individual WDM channels. We investigated systematically this variation and wavelength dependence by using semi-analytical simulations. The benefit of this behavior in transparent optical networks is discussed and demonstrated in network case studies.
We show the principal methodology for providing connections with minimum cost and subject to target availability constraints, that can be used to guarantee service availability in a service level agreement (SLA). For connections without protection and for connections with dedicated protection, we develop path-based design
models and evaluate the gain of availability-based provisioning.
Today, Wavelength Division Multiplexing (WDM) transmission systems are deployed extensively in transport networks. They are used mainly for static point-to-point connections. With the availability of fast reconfigurable Optical Cross Connects (OXC) and the introduction of a control plane in the Optical Transport Network (OTN), optical channel based logical networks can be built for dynamic WDM networks.
Resilience in current transport networks is mainly based on static SONET/SDH dedicated and shared protection. Distributed control planes allow new, flexible protection mechanisms (e.g. GMPLS reroute and fast reroute).
To evaluate future distributed control concepts and new resilience schemes in transport networks, we have implemented a dynamic OTN simulation model.
Several case studies have been performed using different protection and restoration methods. Different failure scenarios (single or multiple link failures) were used. The paper evaluates the case studies in terms of scalability, recovery time criteria, capacity use (efficiency) and availability. It is shown that the new and flexible resilience schemes are a promising alternative to traditional statically preplanned protection in transport networks. Furthermore, they provide increased network availability in multiple failure cases.
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