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Flexible optical network (FON) architectures are considered a very promising solution where spectrum resources are allocated within flexible frequency grids. Routing and spectrum allocation (RSA) in FON is known to be an NP-complete problem. So far, this problem has been optimally solved for small instances by the application of integer linear programming and has been sub-optimally solved for more...
In IP-over-WDM networks, a virtual topology is placed over a physical topology of the optical network. Since a simple link failure or a node failure on the physical topology can lead to a huge loss of information, an important challenge is to make the routing of the virtual topology on to the physical topology survivable. This problem is known as the Survivable Virtual Topology Mapping (SVTM), which...
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