Adaptive wavelength routing in all-optical networks
IEEE/ACM Transactions on Networking (TON)
Analysis of blocking probability for distributed lightpath establishment in WDM optical networks
IEEE/ACM Transactions on Networking (TON)
An Evaluation of Distributed Parallel Reservations in Wavelength-Routed Networks
IEEE Journal on Selected Areas in Communications - Part Supplement
Dynamic Wavelength Allocation in IP/WDM Metro Access Networks
IEEE Journal on Selected Areas in Communications - Part 2
Cross-layer adaptive routing and wavelength assignment in all-optical networks
IEEE Journal on Selected Areas in Communications - Part Supplement
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Different wavelength assignment schemes have been proposed in the literature for improving the blocking performance in optical networks. In this paper we analyze first fit and random wavelength assignment techniques. In the first fit case, the destination node selects the least indexed wavelength from the set of available wavelengths, whereas in random assignment the wavelength is selected randomly from the set of available wavelengths. In this paper, we propose a new wavelength assignment scheme that is highly adaptive. We begin by comparing the blocking performance of two schemes and observing that the first fit scheme outperforms the random assignment scheme if link utilization is high. In any network, link utilization varies from time to time; it is therefore desirable to switch between the wavelength assignment techniques depending on the link utilization so as to attain optimal blocking performance. Here, we propose an adaptive wavelength assignment (AA) technique that can dynamically switch between different wavelength assignment schemes based on link utilization. Our performance study indicates that, as the link utilization changes, the nodes adaptively select the best wavelength assignment technique in real time so as to improve the blocking performance.