STOC '97 Proceedings of the twenty-ninth annual ACM symposium on Theory of computing
IEEE/ACM Transactions on Networking (TON)
Adaptive wavelength routing in all-optical networks
IEEE/ACM Transactions on Networking (TON)
Optical networks: a practical perspective
Optical networks: a practical perspective
Converter Placement Supporting Broadcast in WDM Optical Networks
IEEE Transactions on Computers
Optical Networking & WDM
Multicast routing and wavelength assignment in multihop optical networks
IEEE/ACM Transactions on Networking (TON)
Routing and wavelength assignment in optical networks
IEEE/ACM Transactions on Networking (TON)
Performance of Alternate Routing Methods in All--Optical Switching Networks
INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
Light trees: optical multicasting for improved performance in wavelength routed networks
IEEE Communications Magazine
Lightpath (wavelength) routing in large WDM networks
IEEE Journal on Selected Areas in Communications
WDM optical communication networks: progress and challenges
IEEE Journal on Selected Areas in Communications
Online routing and wavelength assignment in single-hub WDM rings
IEEE Journal on Selected Areas in Communications
Efficient routing and wavelength assignment for multicast in WDM networks
IEEE Journal on Selected Areas in Communications
Restoration in all-optical GMPLS networks with limited wavelength conversion
Computer Networks: The International Journal of Computer and Telecommunications Networking
Routing and wavelength assignment for hypercube in array-based WDM optical networks
Journal of Parallel and Distributed Computing
Wavelength assignment algorithm in optical multicast networks with multi-wavelength conversion
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
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In this paper, we study on-line wavelength assignment in wavelength-routed WDM networks under both unicast and multicast traffic where nodes in the networks have wavelength conversion ability. Since wavelength converters are still expensive and difficult to implement, we consider the case where nodes in networks have only a limited number of converters that are shared by all input channels. We study the problem of setting up connections in such networks using minimum number of wavelength converters. For unicast traffic, we first study the problem of setting up a lightpath on a given link-path with minimum number of conversions. We give a simple algorithm that solves it in O(tk) time where t is the number of links on the path and k is the number of wavelengths per fiber, as compared to the best known existing method that needs to construct an auxiliary graph and apply the Dijkstra's algorithm. We also consider the problem of setting up a lightpath while using wavelength converters at nodes with fewer available converters only when necessary, and give an O(tk) time algorithm. We then generalize this technique to WDM networks with arbitrary topologies and give an algorithm that sets up an optimal lightpath network-wide in O(Nk+Lk) time, where N and L are the number of nodes and links in the network, respectively. We also consider multicast traffic in this paper. Finding an optimal multicast light-tree is known to be NP-hard and is usually solved by first finding a link-tree then finding a light-tree on the link-tree. Finding an optimal link-tree is also NP-hard and has been extensively studied. Thus, we focus on the second problem which is to set up a light-tree on a given link-tree with minimum number of conversions. We propose a new multicast conversion model with which the output of the wavelength converter is split-table to save the usage of converters. We show that under this model the problem of setting up an optimal light-tree is NP-hard and then give efficient heuristics to solve it approximately.