Throughput Maximization in Multi-Band Optical Networks with Column Generation

Cao Chen; Shilin Xiao; Fen Zhou; Massimo Tornatore

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arXiv · 2311.07335

Throughput Maximization in Multi-Band Optical Networks with Column Generation

Cao Chen·Shilin Xiao·Fen Zhou·Massimo Tornatore

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Abstract

Multi-band transmission is a promising technical direction for spectrum and capacity expansion of existing optical networks. Due to the increase in the number of usable wavelengths in multi-band optical networks, the complexity of resource allocation problems becomes a major concern. Moreover, the transmission performance, spectrum width, and cost constraint across optical bands may be heterogeneous. Assuming a worst-case transmission margin in U, L, and C-bands, this paper investigates the problem of throughput maximization in multi-band optical networks, including the optimization of route, wavelength, and band assignment. We propose a low-complexity decomposition approach based on Column Generation (CG) to address the scalability issue faced by traditional methodologies. We numerically compare the results obtained by our CG-based approach to an integer linear programming model, confirming the near-optimal network throughput. Our results also demonstrate the scalability of the CG-based approach when the number of wavelengths increases, with the computation time in the magnitude order of 10 s for cases varying from 75 to 1200 wavelength channels per link in a 14-node network. Code of this publication is available at github.com/cchen000/CG-Multi-Band.

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Cao Chen, Shilin Xiao, Fen Zhou, Massimo Tornatore. 2023-11-13. Throughput Maximization in Multi-Band Optical Networks with Column Generation. https://arxiv.org/abs/2311.07335

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