Lumen Technologies accelerated its multi-year network expansion, aiming to more than double the size of its U.S. intercity fiber backbone to 47 million miles (75.6 million km) by 2028. The company said AI is driving unprecedented demand for bandwidth and ultra-low latency, with enterprises requiring denser, faster, and more reliable connectivity to support large-scale workloads. In 2025, Lumen has already deployed millions of new fiber miles, signal boosters, and capacity upgrades across the country.
So far this year, Lumen has delivered 2.2 million new intercity fiber miles (3.5 million km), constructed 176 In-Line Amplifier sites to boost long-haul performance, and secured long-term rights to additional conduit routes. Network upgrades added 5.9 petabits per second (Pbps) of capacity and more than $100 million has been allocated to extend 400 Gbps services across clouds, metros, and data centers. Lumen’s fiber deployments rely on next-generation Corning cable that doubles fiber density in existing conduits.
The company also highlighted its Private Connectivity Fabric (PCF), designed for AI workloads with 25% lower optical loss than rival networks and 60% more capacity than traditional designs. Lumen’s backbone now covers more than 100,000 route miles (160,900 km) with latency under five milliseconds at the edge, reaching up to 97% of U.S. business demand. “This isn’t incremental – we plan to more than double the size of our U.S. network,” said Kye Prigg, executive vice president, enterprise operations at Lumen. “We’re positioning Lumen as the trusted network for AI.”
- Goal: expand to 47 million intercity fiber miles (75.6 million km) by 2028
- 2025 progress: 2.2 million new fiber miles (3.5 million km), 5.9+ Pbps added capacity
- Signal boosters: 176 ILA sites under construction with triple the power density
- Conduit: secured IRU access on 55 new routes
- 400G rollout: $100M invested, spanning 100,000+ route miles (160,900 km)
- PCF: optimized for AI with lower optical loss, higher capacity, and <5ms edge latency
🌐 Analysis: Lumen’s expansion underscores the growing urgency among network operators to scale infrastructure for AI traffic. Competitors such as Zayo, AT&T, and Google are also building long-haul fiber capacity and next-generation transport layers, but Lumen’s focus on ultra-low-loss fiber and its Private Connectivity Fabric differentiates its approach. The multi-billion-dollar build positions the company to capture rising enterprise and cloud demand as AI models become increasingly distributed and data-intensive.
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