Protection by diversity in elastic optical networks subject to single link failure

Karcius Assis*, Raul Almeida, Martin Reed, Alex Santos, Henrique Dinarte, Daniel Chaves, Haiyuan Li, Reza Nejabati, Shuangyi Yan, Dimitra Simeonidou

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)


Among the multipath protection schemes found in the literature, the Partitioning Dedicated Path Protection — PDPP proposes to divide the total transmission rate required by the connection in equal parts, and then proceed the transmission of each part using multiple disjoint paths. Nevertheless, it is also possible to partition the transmission rate unequally among paths, enabling benefits to network performance. This article proposes a mixed-integer linear programming (MILP) formulation to find an optimized unequally partitioning of connections’ transmission rate among multiple disjoint paths, in order to provide dedicated protection and reduction in maximum number of slots on network and average bandwidth squeezing. The solution is analysed over a number of realistic networks, showing that the proposed formulation significantly reduces the spectral usage compared to traditional protection mechanisms and reduces the amount of squeezing required compared to the former PDPP approach.
Original languageEnglish
Article number103208
Number of pages11
JournalOptical Fiber Technology
Early online date29 Dec 2022
Publication statusPublished - 1 Jan 2023

Bibliographical note

Funding Information:
The authors like to thank the support Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 , Conselho Nacional de Desenvolvimento Científico e Tecnológico – Brasil (CNPq) and China Scholarship Council . In addition, this study is also financed in part by the Alan Turing Institute - UK (project code: D-ACAD-052).

Publisher Copyright:
© 2022


  • Elastic optical network
  • protection
  • routing and spectrum allocation


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