Why 88% of Fiber Optic Cable Sits Dark

The phrase "dark fiber" sounds like cyberpunk fiction, but the reality is surprisingly mundane — and fascinating. In this episode, we explore why fiber optic cables contain dozens to hundreds of individual glass strands, each a discrete waveguide, and why roughly 88% of installed fiber in the United States is completely unlit. We break down the physics that makes fiber fundamentally different from water pipes, the economics of trenching versus cable costs, and the legal instrument called an indefeasible right of use that lets companies like Google lease dark strands as private data highways. If you've ever wondered what's actually happening inside the fiber optic networks that carry the internet, this episode will change how you see the ground beneath your feet.