STL Successfully Trials Multi-Core Fibre (MCF) with Colt in UK, Powering Next-Gen Optical Connectivity

Sterlite Technologies Limited (STL) has announced the successful collaboration with Colt Technology Services (Colt) for the Multi-Core Fibre (MCF) trials executed across Colt’s London metro optical network in London, UK. This marks a significant milestone in real-world validation of MCF technology as a sustainable, high-capacity, cost-efficient backbone for next-generation networks supporting AI, cloud, and digital services. The trial was conducted within the London Metro network between two Colt PoPs, covering distances of ~ 9 km and 63 km. An 800 Gbps line rate was achieved with validation performed for 100GE and 400GE services. STL’s MCF packs 4-cores into the same cladding diameter as standard single-mode fibre (SMF), keeping coating size at 250/200 micrometres and achieving ultra-high transmission capacity per fibre within the same diameter. This trial demonstrates the commitment of both companies to delivering future-ready, sustainable networks that meet growing needs without costing the earth.