Dark Fibre Network

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Building a network to support bandwidth-intensive business applications? Or creating your own backhaul network?

Colt is an award-winning dark fibre provider, offering the most extensive and reliable network in Europe. We cover 51 metropolitan areas which are interconnected by our 38,000km network. We’re confident our dark fibre services will meet any future business need.


Dark fibre gives you maximum control and flexibility over your network, allowing your network to scale-up as your bandwidth requirements grow – providing virtually limitless capacity.


Dark Fibre network services you can trust to perform. We invest heavily in our network. Which is why we’re used by many of the world’s leading carriers, operators and service providers.

Cost Effective

Dark Fibre can provide a highly cost-effective way of managing your own network, enabling you to add bandwidth as your capacity requirements increase.

Learn more

Want to learn more about our optical services?
Check out the rest of our products below.

Private Wave – Private Optical Network
Secure, flexible and high performance private optical networking built on customer-dedicated WDM equipment and fibre infrastructure.

Get ultra-high bandwidth connectivity with Colt Spectrum. The flexibility & control of a long-haul fibre network, without the overheads of Dark Fibre.

Dark Fibre Network
Meet all future business network needs, with Colt’s Dark Fibre Services. Get the maximum control over your network, with a trusted platform, in a cost effective way.

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Case Study

Anonymous: Multinational engineering company

Multinational engineering company ensures network readiness for IoT data…

Related Product


Providing ultra-high bandwidth connectivity, Colt Spectrum enables you to leverage your own investments in DWDM equipment, whilst benefiting from Colt’s extensive optical network reach and connectivity.


Digital transformation is more than raw bandwidth

There’s no shortage of statistics acknowledging the scale of the challenge posed by global consumption of data, and they are all pretty daunting.

Meet Kostas, Product Management Associate

“I joined the Graduate scheme over a year ago and since then I’ve had the opportunity to work on many different projects. My role enables me to build relationships with other functions and meet colleagues across the globe. I get the full experience of the amazing challenger culture at Colt.”


"The project was a complete success and we achieved the goal we set. Collaboration with Colt was excellent."

John Sudbury
CEO Ekovolt