Abstract

Multiband (MB) and multifiber (MF) technologies get significant attention along with their individual pros and cons to solve the optical fiber capacity crunch problem. The MB system is more susceptible to nonlinear transmission impairments such as interchannel stimulated Raman scattering. On the contrary, MF solutions are costly due to the requirement of parallel fiber deployment. Therefore, it is necessary to find a hybrid solution using MB and MF technologies. This paper performs a techno-economic comparison between MF and MB technologies while taking a robust cost model. We propose, for the first time to our knowledge, a domain-knowledge-assisted, cost-effective network upgrade algorithm to enhance the overall network capacity while including minimum capital expenditure (CapEx). The proposed algorithm prioritizes the targeted deployment of cost-effective upgrade solutions in different links of the network to minimize the overall cost of the upgrade. The comparison between optical cable deployment and fiber leasing is captured to upgrade the overall network capacity with minimum cost-per-bit. Reported results show that a single fiber ${\rm C} + {\rm L}$ band system can provide approximately 66.67% gain in terms of traffic admissibility compared to MF C band systems in smaller networks such as BT-UK, while considering fiber leasing. If operator owned dark fibers are not available in any of the links, numerical results show that the MF ${\rm C} + {\rm L}$ band system in the BT-UK network can still provide CapEx savings of approximately up to 40.5% compared to the MF C band systems while minimizing the cost-per-bit of the network by approximately 21.9% to achieve the targeted network capacity of 150 Tbps. The effect of longer link length on the network upgrade cost is also studied in this paper. Reported result shows that, for larger geography such as the pan-Europe network, the channel launch power needs to be tuned to achieve the benefit of the MF ${\rm C} + {\rm L}$ band compared to the MF C band system.

© 2023 Optica Publishing Group

Migration of elastic optical networks to the C + L-bands subject to a partial upgrade of the number of erbium-doped fiber amplifiers

Soheil Hosseini, Ignacio de Miguel, Noemí Merayo, Juan Carlos Aguado, Óscar González de Dios, and Ramón J. Durán Barroso
J. Opt. Commun. Netw. 15(11) F22-F35 (2023)

Impact of the band upgrade sequence on the capacity and capital expenditure of multi-band optical networks

Ningning Guo, Kai Zhang, Yongcheng Li, Ning Deng, Sanjay K. Bose, and Gangxiang Shen
J. Opt. Commun. Netw. 15(10) E1-E17 (2023)

Cost analysis of ultrawideband transmission in optical networks

André Souza, Bruno Correia, Antonio Napoli, Vittorio Curri, Nelson Costa, João Pedro, and João Pires
J. Opt. Commun. Netw. 16(2) 81-93 (2024)

C+L-band upgrade strategies to sustain traffic growth in optical backbone networks

Tanjila Ahmed, Abhijit Mitra, Sabidur Rahman, Massimo Tornatore, Andrew Lord, and Biswanath Mukherjee
J. Opt. Commun. Netw. 13(7) 193-203 (2021)

Machine learning-assisted nonlinear-impairment-aware proactive defragmentation for C+L band elastic optical networks

Rana Kumar Jana, Bijoy Chand Chatterjee, Abhishek Pratap Singh, Anand Srivastava, Biswanath Mukherjee, Andrew Lord, and Abhijit Mitra
J. Opt. Commun. Netw. 14(3) 56-68 (2022)