Optimized design of filterless horseshoe networks exploiting point-to-multipoint coherent transceivers

Mohammad M. Hosseini, Joao Pedro, Antonio Napoli, Nelson Costa, Jaroslaw E. Prilepsky, Sergei K. Turitsyn

Research output: Contribution to journalArticlepeer-review


The horseshoe topology is widely used to realize metro-aggregation networks, since it provides a natural fit to the hub-and-spoke traffic pattern present in the majority of these deployments, while enabling survivability against single link and hub failures. A filterless architecture can also be adopted to further reduce capital expenditure (CapEx) by replacing active elements, such as reconfigurable add/drop multiplexers, with simpler and passive splitters/combiners. Such an architecture can effectively host coherent-based point-to-multipoint (P2MP) transceivers enabled by digital subcarrier multiplexing (DSCM). Importantly, by carefully optimizing the deployment of amplifiers (location and gain) and splitters/combiners (type), it may be possible to reduce the total number of optical amplifiers required, further decreasing CapEx. This paper proposes an integer linear programming framework to optimize metro-aggregation filterless horseshoe networks, taking into account the specific requirements of DSCM-based P2MP coherent transceivers. The results indicate that a considerable reduction in amplifier count is possible while ensuring that end-to-end performance thresholds are met, which include the minimum required input power at the receivers, a maximum subcarrier input power difference at the hub’s receivers, and the minimum optical-signal-to-noise ratio.
Original languageEnglish
Pages (from-to)569-578
Number of pages10
JournalJournal of Optical Communications and Networking
Issue number9
Early online date2 Aug 2023
Publication statusPublished - 1 Sept 2023

Bibliographical note

Copyright © 2023 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Funding Information:
H2020 Marie Skłodowska-Curie Actions (813144); Engineering and Physical Sciences Research Council (Transnet); European Commission H2020 B5G-OPEN (101016663); Fundacao para a Ciencia e a Tecnologia (50008).


  • Transceivers
  • Passive optical networks
  • Point-to-multipoint communications
  • Topology
  • Network topology
  • Optical receivers
  • Multiplexing


Dive into the research topics of 'Optimized design of filterless horseshoe networks exploiting point-to-multipoint coherent transceivers'. Together they form a unique fingerprint.

Cite this