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Optical Engineering

Dynamic routing and spectrum assignment based on multilayer virtual topology and ant colony optimization in elastic software-defined optical networks
Author(s): Fu Wang; Bo Liu; Lijia Zhang; Qi Zhang; Qinghua Tian; Feng Tian; Lan Rao; Xiangjun Xin
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Paper Abstract

Elastic software-defined optical networks greatly improve the flexibility of the optical switching network while it has brought challenges to the routing and spectrum assignment (RSA). A multilayer virtual topology model is proposed to solve RSA problems. Two RSA algorithms based on the virtual topology are proposed, which are the ant colony optimization (ACO) algorithm of minimum consecutiveness loss and the ACO algorithm of maximum spectrum consecutiveness. Due to the computing power of the control layer in the software-defined network, the routing algorithm avoids the frequent link-state information between routers. Based on the effect of the spectrum consecutiveness loss on the pheromone in the ACO, the path and spectrum of the minimal impact on the network are selected for the service request. The proposed algorithms have been compared with other algorithms. The results show that the proposed algorithms can reduce the blocking rate by at least 5% and perform better in spectrum efficiency. Moreover, the proposed algorithms can effectively decrease spectrum fragmentation and enhance available spectrum consecutiveness.

Paper Details

Date Published: 25 July 2017
PDF: 9 pages
Opt. Eng. 56(7) 076111 doi: 10.1117/1.OE.56.7.076111
Published in: Optical Engineering Volume 56, Issue 7
Show Author Affiliations
Fu Wang, Beijing Univ. of Posts and Telecommunications (China)
Bo Liu, Nanjing Univ. of Information Science & Technology (China)
Lijia Zhang, Beijing Univ. of Posts and Telecommunications (China)
Qi Zhang, Beijing Univ. of Posts and Telecommunications (China)
Qinghua Tian, Beijing Univ. of Posts and Telecommunications (China)
Feng Tian, Beijing Univ. of Posts and Telecommunications (China)
Lan Rao, Beijing Univ. of Posts and Telecommunications (China)
Xiangjun Xin, Beijing Univ. of Posts and Telecommunications (China)


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