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From “The Insane Engineering of Fiber Optics” by Veritasium

The engineering behind fiber optics

Put the story in order yourself, then check it against the video — each moment plays where it happens.

Open the interactive page →Make a page from any YouTube video

In order

1. Glass strands and archival footage — A hand holds thin glass strands, then a grainy black-and-white image of two figures on a grey surface, labelled NASA, appears. 1:31
2. Hearing range and bandwidth — The presenter on a sofa notes a hearing range below 20 kHz, and a house is shown beside a signal labelled 0.4 to 0.8 kHz. 3:11
3. The Shannon-Hartley theorem — Portraits of Claude Shannon and Ralph Hartley sit beside the formula for maximum capacity, with bandwidth and a signal-to-noise term. 5:11
4. Light guided through liquid streams — A green light path bends along a stream of liquid, and a refraction diagram with n1 and n2 labels is shown. Water and propylene glycol are compared side by side. 8:41
5. Glass bar and iron absorption — An animated scientist holds up a glass bar, then a chart of iron ion absorption in glass plots absorbance against wavelength with Fe3+ and Fe2+ peaks marked. 13:31
6. Molten glass and light pulses — A tour scene with a visible AD tag is followed by molten glass pouring into a mould, a glowing light pulse animation, and the label Fused silica: n = ~1.46. 16:01

Details the frames hold

Propylene glycol light path — A green light beam curves out of a clear container of propylene glycol, labelled beside the water test.
Iron ion absorption curve — A yellow curve dips and rises across wavelengths from 300 to 1500 nm, with arrows marking Fe3+ and Fe2+ peaks.
Molten glass pour — A bright orange stream of molten glass pours from a crucible into a sand mould.
Glass tube and flame — A glass tube is mounted on a stand with a flame at its left end and a small teal device at the lower right.

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