Abstract
We address the issue of efficiently assigning wavelengths to communication requests in wavelength division multiplexing (WDM) optical networks. We consider directed tree and tree of rings topologies. These are topologies of concrete practical relevance for which undirected underlying graph models have been studied by Raghavan and Upfal [6]. Directed models were first studied by Mihail et al [4].
For trees, we give a polynomial time routing algorithm that, for requests of maximum load L per directed fiber link, uses at most 7/4L wavelengths. This improves the bound of Mihail et al.. As a corollary we also give an algorithm for trees of rings that uses 7/2L wavelengths.
Partially supported by Progetto MURST 40%, Algoritmi, Modelli di Calcolo e Strutture Informative and by EU Esprit Project GEPPCOM.
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© 1996 Springer-Verlag Berlin Heidelberg
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Kaklamanis, C., Persiano, P. (1996). Efficient wavelength routing on directed fiber trees. In: Diaz, J., Serna, M. (eds) Algorithms — ESA '96. ESA 1996. Lecture Notes in Computer Science, vol 1136. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-61680-2_75
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DOI: https://doi.org/10.1007/3-540-61680-2_75
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