The routing algorithm of multi-layer multi-domain intelligent optical networks based on ant colony optimization

With the rapid growth of the network scale, the maintained link state information of one individual node will be too large, which brings serious burden to the network bandwidth and signaling processing. So the networks need to be divided into multi-layer and multi-domain networks, and each node only has the topology information of the routing domain where it belongs. Therefore the routing and wavelength assignment algorithm for the whole networks information will no longer be applied. The hierarchical routing of intelligent optical networks is introduced firstly in this paper. Then an improved ant colony algorithm is developed and simulated in multi-layer and multi-domain optical network model. The simulation results show that the improved ant colony algorithm increases the convergence speed, reduces the blocking probability and improves the network performance.