Comparison between shortest path first routing and dynamic least load routing in WDM networks

摘要

Wavelength routed optical networks represent the direction to the future high capacity wide-area network applications. In this paper we consider the wavelength routed optical networks. And we focus on the routing scheme and simulations have been done to observe the difference between Shortest Path First Routing and Dynamic Least Load Routing. Basing on the latest topology and wavelength utilization information, the Shortest Path First Routing selects the available shortest path and wavelength among W wavelength virtual networks. The Dynamic Least Load Routing dynamically searches the least loaded path among the pre-computed path sets and chooses the available wavelength. Considering the length of optical path will be of length restriction, we assume that both two routing methods have the same length restriction. From the observation we can find the Least Load Routing yields better Performance than Shortest Path Routing both in single fiber optical network and multi-fiber optical network.