Dark Fiber
Dark fiber is installed optical fiber that is leased without any transmission equipment attached, leaving the customer to supply its own optics. It gives the customer full control over capacity, protocol, and encryption across the route.
Dark fiber is optical fiber leased or sold without any transmission equipment attached. The strand is physically in place but carries no light until the customer installs its own optics at each end.
Why customers want it
Lighting your own fiber gives complete control over capacity, protocol, and encryption, and it decouples cost from bandwidth. Once the optics are installed, upgrading from ten gigabits to four hundred is an equipment change rather than a new service contract.
How it is sold
Dark fiber is commonly transacted as a long term lease or an indefeasible right of use, often spanning many years, with the customer responsible for the electronics and the provider responsible for the physical plant.
Why it matters for marketing
Dark fiber availability is a specific, searchable capability that separates facilities with real network depth from those with a generic carrier list.
If a facility offers dark fiber routes, name the routes, name the endpoints, and explain the use cases in plain language. Route-level specificity is precisely the kind of detail that gets a facility surfaced when someone asks an AI assistant which providers offer dark fiber between two named points.
Common questions
What is the difference between dark fiber and lit services?
Lit services deliver a defined bandwidth over the provider's own equipment, and the provider manages the optical layer. Dark fiber delivers the physical strand only, and the customer supplies and manages the optics, controlling capacity, protocol, and encryption end to end.
Who buys dark fiber?
Organizations that need very high capacity, complete control over encryption and protocol, or predictable long term cost on a route they will use for years. Financial trading firms, research networks, large enterprises linking campuses, and carriers building their own backbone are typical buyers.