The global race to build AI data centers is exposing a limit less visible than GPU supply or electricity: the fiber optic cable needed to connect all that compute. The United States alone might need another 66 million miles of fiber to hook up new data centers before 2029, while Europe and Asia are speeding up spending on backbone networks and submarine cables so connectivity doesn’t become the choke point in the AI buildout.
Fiber for AI in 30 seconds
- The U.S. could go from 159 to 373 million miles of fiber by 2029.
- Another 66 million miles would be needed just to connect new data centers.
- The Fiber Broadband Association estimates North America will need about 180,000 more technicians over the next decade.
- Europe is preparing AI Gigafactories with high-speed connectivity and putting €200 million toward new backbone networks and cables.
- Asia is expanding submarine routes as big data center markets like India and Southeast Asia grow.
The reason is simple. Large AI clusters don’t work in isolation. They have to talk to other sites, cloud regions, enterprise networks, users, and exchange points. Redundant routes matter too, so an outage or a physical cut doesn’t strand a facility that may have cost billions.
The more compute you concentrate, the more you need bandwidth, low latency, and redundancy.
So fiber availability is starting to sit next to electricity, land, water, and permits among the factors that decide where new data center campuses can go.
The U.S. will need to more than double its fiber before 2029
A study by the Fiber Broadband Association (FBA), done with RVA and using estimates from Corning, spells out the scale of the American challenge.
It estimates fiber routes could grow from roughly 95,000 to 187,000 miles by 2029. Measured as total fiber installed within those routes, the jump is bigger: from 159 million to about 373 million miles.
Not all of that is new digital highway.
The estimate includes about 109 million miles of extra fiber on existing routes that need capacity upgrades, another 66 million miles to connect new data centers, and around 38 million miles for new long-distance routes.
The total deployment would be roughly 2.3 times today’s size.
The growth of hyperscale data centers drives it. The FBA estimates their capacity could triple before 2029, mostly from AI applications.
The amount of cable isn’t the whole story.
An AI campus needs multiple physical connections and alternate routes. An excavator that nicks a conduit shouldn’t be able to knock out a cluster with tens of thousands of accelerators.
That means designing independent entry points, redundant underground routes, and connections with several operators. The FBA also points to cables with 1,728 fibers or more and technologies like Dense Wavelength Division Multiplexing (DWDM), which sends many optical channels over a single fiber at once.
So fiber can become a bottleneck even when a data center already has land and power.
Cable isn’t enough: you also need thousands of technicians
The second challenge is people.
Rolling out a fiber network takes specialized crews who can splice cable, install connectors, take optical measurements, troubleshoot, and maintain it over time.
The Fiber Broadband Association estimates North America will need around 180,000 more technicians over the next decade to keep up with construction, maintenance, and expansion.
That figure needs some detail.
An earlier study from the FBA and the Power & Communication Contractors Association (PCCA) put immediate needs at about 28,000 workers for broadband deployment plus another 30,000 technicians, roughly 58,000 professionals for planned projects.
But over a decade the gap widens: about 119,200 workers could retire or leave the sector, which could open a shortfall of roughly 180,000 professionals.
The association is trying to grow its talent pool with its OpTIC Path program.
As of May 2026, it ran in more than 20 states, with eight more joining and over 38 educational organizations involved. More than 1,550 students had already finished the training.
The program runs 144 hours covering installation, splicing, testing, troubleshooting, and optical network maintenance. A specific module for data center technicians is due in Q3 2026.
This points to something people rarely note about AI’s growth: automating some digital tasks doesn’t remove the huge amount of physical work behind it.
Someone has to build the data centers, install the cooling, lay the cable, and splice the fiber.
Europe has plenty of fiber, but AI needs a different scale of connectivity
Europe starts from a different place.
As of 2025, fiber-to-the-premises (FTTP) coverage reached 74.1% of EU households, and very high-capacity fixed networks reached 85.6%. Fiber has become Europe’s most widespread fixed broadband technology.
But connecting homes and linking AI data centers are different problems.
A cluster with tens of thousands of accelerators needs backbone routes that can carry enormous traffic between data centers, exchange points, cloud networks, and across countries.
Europe’s own AI strategy acknowledges the dependency.
In July, the EU opened a call to set up up to seven AI Gigafactories, backed by up to €10 billion in public and national funding, with hopes of pulling in at least another €20 billion from the private sector.
These sites will combine more than 100,000 advanced AI processors with data centers, software, cloud infrastructure, power, and, explicitly, advanced networks and high-speed connectivity.
They come on top of the 19 AI Factories already in the European strategy.
So fiber becomes essential to make all this capacity work as distributed infrastructure rather than a set of isolated supercomputers.
The European Commission is also trying to cut deployment hurdles, especially permits.
The Gigabit Infrastructure Act, fully in force from May 12, 2026, aims to lower costs and speed up the rollout of ultra-high-capacity networks. The Commission ties the need for more bandwidth directly to the growth of cloud computing and AI.
Europe is also looking to submarine cables
The bottleneck doesn’t stop at land borders.
A lot of international traffic between data centers runs over submarine cables. The European Commission notes that this infrastructure and other backbone fiber carry about 99% of global internet traffic.
In March 2026, Brussels announced calls for €200 million to strengthen it.
About €180 million goes to deploying or upgrading backbone networks, especially submarine cables, but also terrestrial fiber and satellite communication stations. The other €20 million funds intelligent cabling systems that improve infrastructure monitoring.
Some of these projects link directly to Spain.
The future PISCES system will connect Ireland, Portugal, Spain, and France over roughly 3,000 kilometers of submarine cable. It will carry 16 fiber pairs and use an open-access model for telecom operators, cloud providers, and academic institutions.
Beyond capacity, Europe wants route diversity. Ireland, for example, leans heavily on links through the UK, and parts of Europe’s submarine infrastructure are aging.
As data centers expand, that redundancy becomes an economic issue as much as a technical one.
Asia is building its own submarine highways for AI
Asia-Pacific is a different picture. Some of the world’s biggest digital markets sit alongside geography that makes submarine cables especially important.
Growing data centers in India, Malaysia, Indonesia, Japan, and other Southeast Asian markets are raising regional connectivity needs.
India is a clear example.
Its operational data center capacity has reached about 1.7 GW, four times more than six years ago, per BloombergNEF data published this August. That includes roughly 1.3 GW under construction and 3.2 GW of approved projects.
International connectivity has to grow with it.
One project announced this summer is I-2SEA, a new roughly 3,600-kilometer submarine cable system linking India, Malaysia, and Singapore. The consortium includes Microsoft, Lightstorm, Tata Communications, Singtel, ASEAN Cableship, and NEC, with service expected to start in Q4 2029.
India currently has 17 active submarine cables totaling about 960 Tbps of capacity, with at least ten more projects in planning.
Investment in Southeast Asia is climbing fast too. AWS, Google, and Microsoft have together committed more than $50 billion in cloud infrastructure and AI-ready data centers across the region, per a report backed by Singapore’s Economic Development Board.
Projects like Apricot and SJC2 add new routes connecting markets such as Japan, Singapore, Taiwan, the Philippines, Indonesia, Hong Kong, and other parts of Asia.
A key difference from the United States is that in Asia, expanding AI infrastructure means upgrading terrestrial fiber and laying an enormous network of undersea cables across thousands of kilometers of ocean at the same time.
From GPUs to the infrastructure that connects them
The AI boom shows a data center can no longer be judged by its GPU count alone.
First the problem was electric power. Then cooling, transformers, substations, turbines, and energy storage. Land and grid connection times entered the equation too.
Now optical connectivity is starting to play a similar role.
All of these are linked. Data centers are moving to places with reliable power, but those sites don’t always have the fiber routes that used to follow the major data-hub markets.
Building where the energy is can later mean laying telecom infrastructure just to reach the site.
The fastest-growing AI centers, especially in the U.S., show how the physical infrastructure keeps expanding. GPUs, electricity, and data centers all need a fourth piece: millions of kilometers of fiber to move data between them.
Frequently Asked Questions
How much extra fiber will the U.S. need for data centers?
The Fiber Broadband Association estimates around 66 million miles of fiber will be needed just to connect new data centers before 2029, on top of upgrades to existing routes and new long-distance connections.
Why do AI data centers need so much fiber?
Large clusters have to exchange data with other facilities, cloud networks, users, and internet services at high bandwidth and low latency. They also need several independent physical routes to keep running during outages.
Is there a technician shortage too?
Yes. The FBA estimates North America will need about 180,000 more technicians over the next decade to support network construction, maintenance, and expansion.
Do Europe and Asia face the same problem?
The situation varies, but the need is similar. Europe is strengthening backbone networks and submarine cables while building AI Factories and future Gigafactories. Asia is deploying new terrestrial and submarine routes to connect fast-growing data markets across vast distances.
