Buying the Route: IRUs, Dark Fiber, and the Carrier Map
The dark-versus-lit choice is really a control-versus-convenience trade, and AI campuses are quietly shifting toward control. When you lease dark fiber under a long-term IRU, you buy a physical path for twenty years and light it yourself, capturing every future gain in optical capacity for the price of new endpoint equipment. When you buy lit capacity, you rent bits and stay flexible. My read: hyperscalers with predictable, enormous, growing traffic increasingly want the strand, not the service, because owning the glass converts an operating expense into a depreciating asset and locks in a diverse path before rivals claim it. The carrier that owns the right-of-way holds the real scarcity.
Knowledge check
What is an IRU and why would an AI operator prefer one over buying lit capacity?
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An indefeasible right of use is a long-term, often twenty-year, exclusive lease of specific fiber strands or capacity, paid largely up front. An AI operator prefers it when traffic is large, predictable, and growing, because owning and lighting the strand captures future capacity upgrades for the cost of new endpoint electronics, locks in a specific diverse physical path for decades, and converts a recurring lease that rises with usage into a controllable long-term capital asset while denying that scarce path to competitors.