How Optical Fiber Carries Signals
Carrying signals by total internal reflection
0:55 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
Click a time to play from that scene.
Optical Fiber
Optical fiber carries information by sending light through a thin strand of glass.
Inside a Fiber
A core in the center is wrapped in cladding. The core's refractive index is slightly higher than the cladding's.
Total Internal Reflection
Light that enters at a shallow angle keeps totally reflecting at the boundary between core and cladding, so it travels on without escaping.
Even When Bent
Light still gets through even when the fiber bends gently. But light at too steep an angle leaks out.
Blinking Light: 1 and 0
A laser blinks to send 1 when on and 0 when off, and the receiver turns it back into an electrical signal.
Over Long Distances
Light weakens very little, so it travels far. On very long routes, amplifiers along the way boost the light.
Trapping Light by Reflection
Optical fiber traps light in the core by total internal reflection, and sends information far with blinking light.
Create 3D explainer videos like this sample from your documents and chat
Just attach product documents, drawings, or CAD data and tell the AI in chat what video you want. The AI plans the storyboard, builds the 3D scenes, and turns it into a video with narration and captions. You pay only for what you use (a rough guide is about 3,500 credits for a 1-minute video with 2 small revisions).
