We send emails and watch videos on the internet. This data travels across oceans in seconds. How does data travel so fast over long distances? It does not use copper wires anymore. It uses thin glass fibers called fiber optic cables. Let us see how they work. 🌐
Sending Data with Light
Fiber optic cables are made of glass strands as thin as human hair. Instead of electricity they use light to carry data. A laser transmitter flashes light pulses into the glass. The light bounces inside the glass tube until it reaches the other end.
Here is the fiber data path:
[Laser Pulse Input] ==> [Light Reflects in Glass] ==> [Receiver Decodes Signal]
This reflection path keeps the light inside the glass. The light travels at the speed of light in glass. This is much faster than electricity in copper.
Fiber Optics vs Copper Wires
Let us compare the two main cable types used for networks:
| Cable Type | What It Carries | Main Advantage |
|---|---|---|
| Copper Cable | Electrical currents | Cheap and easy to install |
| Fiber Optic Cable | Light pulses | Huge bandwidth and no signal loss |
⚡ Signal speed depends on medium. We can write a simple speed ratio formula:
Speed Index = Medium Light Speed / Vacuum Light Speed
Fiber optics have a very high speed index. This is why we have high speed broadband today. 🚀
Connecting the World
Giant fiber optic cables are laid on the ocean floor to connect continents. They carry ninety nine percent of international internet traffic. Without fiber optics the modern internet would not exist. It is a vital technology for our connected planet.
