Abstract

With the advent of the era of the 5th generation fixed networks (F5G), some bandwidth-hungry services such as 4K/8K video, telemedicine, and virtual reality (VR) gaming are emerging, which will bring more challenges to the optical network. Typically, both flexible bandwidth allocation and dynamic services deployment will encounter a bottleneck when huge volumes of access data are flooded. To break it, virtual optical network embedding (VONE) over the space division multiplexing (SDM) based elastic optical network (EON) using multi-core fiber (MCF) is adopted. However, the problem of inter-core crosstalk (IC-XT) between two adjacent cores in an MCF link has not been solved. In this paper, we first design a heterogeneous MCF (HMCF) structure. The IC-XT can be significantly reduced when virtual networks are embedded over EONs with HMCF. Then some integer linear programming (ILP) models are established to formulate the process of VONE over EONs with HMCF. Next, to avoid the high time complexity of ILP, we propose a novel VONE algorithm supporting joint IC-XT-avoid cores and frequency slots assignment in EONs with HMCF. Finally, simulation results demonstrate that the proposed algorithm can effectively improve 72% of the available frequency ratio (AFR) and reduce 35% of the fragmentation ratio (FR) compared with conventional VONE over MCF-based networks without any IC-XT reducing strategy, which squeezes more bandwidth resources.

Core and spectrum allocation to achieve graceful degradation of inter-core crosstalk with generalized hierarchical core prioritization on space-division multiplexing elastic optical networks

Yuya Seki, Yosuke Tanigawa, Yusuke Hirota, and Hideki Tode
J. Opt. Commun. Netw. 15(1) 43-56 (2023)

Deep learning and hierarchical graph-assisted crosstalk-aware fragmentation avoidance strategy in space division multiplexing elastic optical networks

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Crosstalk-aware spectrum defragmentation by re-provisioning advance reservation requests in space division multiplexing enabled elastic optical networks with multi-core fiber

Yongli Zhao, Liyazhou Hu, Ruijie Zhu, Xiaosong Yu, Yajie Li, Wei Wang, and Jie Zhang
Opt. Express 27(4) 5014-5032 (2019)

On-Demand Spectrum and Core Allocation for Reducing Crosstalk in Multicore Fibers in Elastic Optical Networks

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J. Opt. Commun. Netw. 6(12) 1059-1071 (2014)

Fragmentation-Aware VONE in Elastic Optical Networks

Min Zhu, Shengyu Zhang, Qing Sun, Guixin Li, Bin Chen, and Jiahua Gu
J. Opt. Commun. Netw. 10(9) 809-822 (2018)