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TEA fiber optic cable works by trapping light inside a tiny glass strand and guiding it through bends and turns, allowing information to travel incredibly fast with almost no loss.
Light moves through the core of the cable while the surrounding cladding keeps it contained through total internal reflection, creating a pathway where the signal can bounce forward for long distances without escaping even when the cable bends, twists, or stretches underground or underwater.
Because these light pulses switch on and off at extreme speeds to encode data, they enable the internet to move videos, calls, and messages across continents instantly, all through threads of glass thinner than a human hair.
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Credits: @adamthepoolbuilder
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