Summary
- The project connected two Colt locations in central London.
- Network Planning Solutions installed and validated Relativity Networks’ ChronoCore fibre.
- The partners claim latency reductions of around 30%; a complete commercial service has not been announced.
Colt Technology Services, Network Planning Solutions and Relativity Networks have completed a hollow-core fibre proof of concept connecting two of Colt’s existing network locations in central London. The 13 October announcement says the fibre has been installed and validated within the operator’s live infrastructure, rather than demonstrated only under laboratory conditions.
Relativity Networks provided ChronoCore hollow-core fibre, Network Planning Solutions led installation and validation, and Colt supplied the operational network locations for the proof of concept. Hollow-core designs guide light through an air-filled region rather than relying on the solid glass core used in conventional fibre. Light travels more rapidly in that medium, creating an opportunity to reduce transmission delay along an equivalent route.
The partners describe latency reductions of around 30% compared with conventional arrangements. That is their stated technology benefit, not an independently verified end-to-end improvement for every application. Cable length, equipment processing, network paths and physical interconnection all contribute to latency experienced by a service customer.
From demonstration to network operation
Placing a new fibre design into an established metropolitan network creates practical engineering tests that a laboratory coil cannot cover. Installation routes involve bends, joints, ducts and other constraints. Field teams need workable splicing and termination methods, and operators must confirm that optical loss, compatibility and reliability remain within the desired service envelope.
The announcement says the system is live inside Colt’s infrastructure, but it is specifically described as a proof of concept. It does not establish that a generally available customer service with published prices, routes and service-level guarantees has launched. Additional testing and commercial qualification may be needed before broader deployment.
Colt and its partners identify data centre interconnection and distributed AI workloads among possible uses. Shorter transport delay may help tightly coupled services, but the benefit of hollow-core fibre depends on application sensitivity and where delays arise. A distributed computing job can remain limited by storage access, switching, application synchronisation or long physical distances even if one fibre section is faster.
Hollow-core fibre also need not replace conventional transmission lines throughout an entire network. It may be commercially justified first on routes where latency carries a substantial economic or operational value. Other connections may continue to favour established glass fibre on the basis of cost, reach, capacity and straightforward repair.
The partners have not published a detailed independent test record covering the measured installed route length, all optical performance metrics and lifetime operating behaviour. The claimed reduction should remain attributed until such evidence is available.
Long-term fault repair presents a further test for a new fibre type. Established optical networks benefit from widely available components, splicing skills and field tools, while specialist cable can create supply chain and training requirements. The London test indicates that installation and validation were achieved at the trial locations, but it does not establish a national stock of spare parts or trained crews. Customers assessing mission-critical routes will want repair procedures and availability commitments alongside measured transmission speed.
ChronoCore fibre has now been installed and tested between the two London network locations. Colt has not announced broader commercial availability, customer service guarantees or long-term fault and performance measurements for this technology.
