Research On The Routing Algorithms For Multi-domain Intelligent Optical Networks

During the research of the intelligent optical networks, it is founded that if all the devices in the intelligent optical networks are managed in one domain, each node in the domain needs to maintain a very large database, which will bring great challenges to the management of the networks. To solve this problem, the concept of multi-domain intelligent optical networks has emerged and become the inevitable result of large-scale distributed management of the future transmission networks.At present, the multi-domain architecture and a series of key technologies have become the research hotspots in the optical communication field. In the multi-domain architecture, with the traffic increase, the path calculation needs to consider many factors, so the calculation of multi-domain path brings a huge computing pressure to the device. To alleviate the computational burden, the Internet Engineering Task Force(IETF) proposed a network architecture based on the Path Computation Element(PCE). The proposed network architecture optimizes the computing performance of node devices to a great extent. In this thesis,the routing algorithms are developed to solve the routing problem in the multi-domain intelligent optical network based on the hierarchical path computation unit network architecture.Firstly, based on the shortcomings of the basic ant colony algorithm,an improved ant colony algorithm is proposed and simulated for the traveling salesman problem. The results show that compared with the maximum and minimum ant colony algorithm, the improved ant colony algorithm can effectively improve the convergence time of the ant colony algorithm. Secondly, the improved ant colony algorithm is applied to path calculation in PCE. Combined with the special communication mode of PCE path computation unit, a better cross-domain path calculation method----the improved inter-domain routing algorithm is proposed,which is based on PCE network architecture and supports the differentiated services. The algorithm is simulated in a multi-domain optical network architecture based on hierarchical PCE. The results show that the improved inter-domain routing algorithm can reduce the inter-domain traffic processing time and improve the processing capability.