How Lisbon’s LUMIRing is emerging as a globally recognised testbed for multicore fibre technology
The LUMIRing project aims to advance multicore fibre technology by embedding a testbed into the subway system, addressing challenges of real-world deployment while positioning Portugal at the forefront of optical communications innovation The global telecommunications sector is facing unprecedented demand for data transmission, driven by cloud computing, artificial intelligence (AI), high-definition video streaming, and the Internet of Things (IoT). Conventional optical networks based on single-core fibres (SCFs) are approaching their capacity limits, motivating the adoption of Space-Division Multiplexing (SDM) as a key technology for future optical infrastructures. Among SDM solutions, Multicore Fibre (MCF) enables multiple spatial channels within a single optical fibre, significantly increasing transmission capacity. However, widespread deployment requires overcoming challenges such as operation in harsh urban environments, precise fibre splicing, and minimising inter-core crosstalk. The LUMIRing (Lisbon Underground Multicore Fibre Ring) project, coordinated by Iscte – Instituto Universitário de Lisboa, addresses these challenges through a pioneering real-world deployment of MCF technology. By integrating a state-of-the-art multicore fibre testbed into Lisbon’s underground metro infrastructure, LUMIRing bridges the gap between laboratory research and operational networks. …








