Multi-layer optical network design based on clustering method

The design of logical topology in Optical network is preceded by Routing and Wavelength Assignment in the Optical network design method. The logical topology is a set of lightpaths formed to serve the traffic demands. It must be flexible and robust for changes or reconfiguration in the future while minimizing the cost and optimizing some objective functions as well. These features can be found in a multi-layer architecture. The multi-layer architecture in Optical network includes Service layer, Electrical layer and Optical layer where the Optical layer serves as the backbone of the lower layers. Moreover, the equipment at the optical node like Optical Cross Connect (OXC), cannot serve all demands in the traffic demand matrix (the set of lightpath is limited by number of transmitters and receivers for example). Some nodes and lightpaths are pre-selected and formed the Optical network in the Optical layer of the multi-layer architecture. In this paper, we show an approach of multi-layer Optical network design by analyzing a traffic demand matrix and physical topology in order to classify nodes into either Optical layer or Electrical layer using clustering method and then design the logical topology to reach a certain limitation and objective function. Our approach of multilayer reduces the size of Optical network that results in the lower cost of equipments and less constraints in the design. Besides, the clustering method provides the multivariate analysis to cluster the data by the combination of characteristics of network nodes that can be extended to the financial cost of equipments, the location data or even the policy data.