Grouping-Based Dynamic Routing, Core, and Spectrum Allocation Method for Avoiding Spectrum Fragmentation and Inter-Core Crosstalk in Multi-Core Fiber Networks

Funa Fukui, Tomotaka Kimura, Yutaka Fukuchi and Kouji Hirata ()
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Funa Fukui: Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan
Tomotaka Kimura: Faculty of Science and Engineering, Doshisha University, Kyoto 610-0321, Japan
Yutaka Fukuchi: Faculty of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan
Kouji Hirata: Faculty of Engineering Science, Kansai University, Osaka 564-8680, Japan

Future Internet, 2025, vol. 17, issue 6, 1-20

Abstract: In this paper, we propose a grouping-based dynamic routing, core, and spectrum allocation (RCSA) method for preventing spectrum fragmentation and inter-core crosstalk in elastic optical path networks based on multi-core fiber environments. Multi-core fibers enable us to considerably enhance the transmission capacity of optical links; however, this induces inter-core crosstalk, which degrades the quality of optical signals. We should thus avoid using the same frequency bands in adjacent cores in order to ensure high-quality communications. However, this simple strategy leads to inefficient use of frequency-spectrum resources, resulting in spectrum fragmentation and a high blocking probability for lightpath establishment. The proposed method allows one to overcome this difficulty by grouping lightpath-setup requests according to their required number of frequency slots. By assigning lightpath-setup requests belonging to the same group to cores according to their priority, the proposed method aims to suppress inter-core crosstalk. Furthermore, the proposed method is designed to mitigate spectrum fragmentation by determining the prioritized frequency bandwidth for lightpath-setup requests according to their required number of frequency slots. We show that the proposed method reduces the blocking of lightpath establishment while suppressing inter-core crosstalk through simulation experiments.

Keywords: multi-core fiber; elastic optical path network; routing, core, and spectrum allocation; crosstalk (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2025
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