Distributed routing based on improved ant colony algorithm in multi-domain wson

The routing and wavelength assignment optimization problem in multi-domain WSON is researched. An inter-domain routing optimization algorithm based on improved ant colony algorithm is proposed. The proposed algorithm can achieve the routing optimization under multi-constraint condition, and can acquire the working and backup paths at one time for network survivability as well. Simulation experiments indicate that the algorithm can reduce the congestion degree of the networks and enhance the blocking performance of routing calculation for traffic requests when the inter-domain path protection is required.