A Minimal Cost WDM Network for Incremental Tra

Galen Sasaki* and Tao Lin University of Hawaii, 2540 Dole Street, Honolulu, HI 96822, USA ABSTRACT A wavelength division multiplexed (WDM) network is considered for arbitrary topologies. The network allows optical signals to pass through nodes, which often results in less electronic and opto-electronic equipment than networks that do not, i.e., networks that only switch tra c electronically. A disadvantage of having optical pass through is that there is less capability to switch tributary tra c streams and so there may be more blocking. However, it is shown that the network operates as well as a network with only electronic switching under a particular incremental tra c model. Examples are given that shows that the network can have lower cost when the cost is dominated by the line terminating equipment. A simple heuristic design algorithm is also given to con gure the network to minimize its cost.