How do guided media differ from unguided media? Name the advantages of optical fiber over twisted-pair and coaxial cable.

Question

**How do guided media differ from unguided media? Name the advantages of optical fiber over twisted-pair and coaxial cable.**

Accepted Answer

**Guided vs Unguided Media**

| Aspect | Guided Media | Unguided Media |
|---|---|---|
| Physical path | Signal is confined to a physical conductor (cable) — twisted pair, coaxial, fiber | Signal propagates freely through air/space — radio waves, microwaves, infrared |
| Direction control | Signal direction is fixed by the cable path | Signal can spread in multiple directions (omnidirectional) or be focused (directional, e.g. satellite dish) |
| Security | Harder to intercept without physical access | Easier to intercept since signals radiate openly |
| Mobility | Requires physical connection — no device mobility | Supports mobile/untethered devices (Wi-Fi, cellular) |
| Typical examples | Twisted pair, coaxial cable, fiber optic | Radio waves, microwaves, infrared, satellite links |

**Advantages of optical fiber over twisted-pair and coaxial cable**

1. **Higher bandwidth** — supports much higher data rates (multi-Gbps to Tbps) than copper media.
2. **Lower attenuation** — signal travels much farther before needing regeneration, reducing the number of repeaters needed.
3. **Immunity to EMI** — since it carries light, not electrical current, it's unaffected by electromagnetic interference and doesn't cause crosstalk.
4. **Better security** — much harder to tap into without physically breaking the fiber (which is detectable).
5. **Smaller size and lighter weight** — easier to route in dense cable runs compared to bulky coaxial cable.
6. **No electrical hazard** — since it doesn't carry electrical current, it's safe in electrically noisy or hazardous environments (e.g. near heavy machinery).

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