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In wavelength routed wavelength division multiplexing (WR-WDM) networks, a set of lightpaths (all-optical communication paths) defines the virtual topology. In the event of a node failure, the virtual topology may be partitioned so that a set of nodes may not able to communicate with another set of nodes. In such a case, the restoration of disturbed lightpaths may be indispensable. Hence, it may be...
Traffic grooming in wavelength division multiplexing (WDM) optical networks controls how to consolidate client calls with sub-wavelength data rates onto lightpaths. It can be classified into static or dynamic traffic grooming depending on whether the client traffic is static or dynamic. The principal problem in traffic grooming is to construct a logical topology to route client traffic over a given...
In this paper, we investigate the effect of different restoration sequence upon multiple failure recovery in multi-wavelength WDM networks. The major difference among these arrangements is on restoration speed and resource utilization. We develop heuristics to find restoration sequence for dynamic traffic demands with different quality of service requirements. Especially, we adopt the aggregate rerouting...
In this paper we consider algorithms for the logical topology design and traffic grooming problem in WDM networks with router interface constraints as well as optical constraints. The optical constraints include restricted transmission range due to optical impairments as well as limits on the number of available wavelengths. We formulate this problem as an integer linear program which is NP-complete...
Survivable routing of a connection involves computation of a pair of diverse routes such that at most one route fails when failures occur in the network topology. A subset of links in the network that share the risk of failure at the same time are said to belong to a shared risk link group (SRLG) [J. Strand et al., Feb 2001]. A network with shared risk link groups defined over its links is an SRLG...
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