How Fiber Works
A fiber cable looks simple from the outside, but inside it's a precisely engineered stack. Hover the cross-section to learn what each layer does.
↪ Total Internal Reflection
Light hits the boundary between core and cladding at a shallow angle and bounces back inward — staying trapped as it travels down the strand.
★ Fiber
Fact
Fact
Modern single-mode fiber can transmit data across hundreds of miles before any signal regeneration is required.
[ Knowledge Check ]
Which layer keeps the light trapped inside the core?
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