Wan, Yingyu; Liang, Weifa
We consider the problem of minimizing the number of wavelengths needed to connect a given multicast set in a multihop WDM optical network. This problem was introduced and studied by Li et al. (Networks, 35(4), 260-265, 2000) who showed that it is NP-complete. They also presented an approximation algorithm for which they claimed an approximation ratio of c(1 +2 log Δ), where c is the maximum number of connected components in the subgraph induced by any wavelength and A is the maximum number of...[Show more]
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