Dynamic spectrum and core allocation with spectrum region reducing costs of building modules in AoD nodes

In order to expand the transmission capacity of optical backbone networks, many innovative technologies such as Elastic Optical Network (EON) and Space Division Multiplexing (SDM) have intensively researched. These advanced network technologies require new optical node structures which can fully utilize the additional channels of the next-generation networks. Architecture on Demand (AoD) concept enables to construct flexible and scalable optical node structure by dynamically reconfiguring interconnections of building modules according to switching requests. Because resource allocation methods have impact on switching requests, the number and the types of building modules required for AoD nodes are dependent on not only traffic patterns but also spectrum allocations. In this paper, we propose spectrum and core allocation method based on spectrum region which is related with corresponding building modules of AoD nodes in Multi-Core Fiber Elastic Optical Networks (MCF-EONs). The proposed spectrum regions make two advantages. The one is reducing spectrum fragmentation which is an challenging issue in EONs. The other is replacing building modules of AoD nodes with simple and low-cost ones. Finally, we evaluate the proposed spectrum and core allocation method through computer simulations. The simulation results demonstrate that reducing spectrum fragmentation improves blocking probabilities and replacing building modules reduces modular costs of AoD nodes.