Red Seal Electrician Practice
Signalling and communicationQuestion 49 of 1506

Which fibre is chosen for long-distance networks of many kilometres?

  1. Multimode fibre
  2. Plastic-coated copper
  3. Single-mode fibre
  4. Coaxial cable
Show answer

Correct answer: Single-mode fibre

A core of about 5 microns allows a single light path, so there is no pulse stretching.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 14.5: Optical Data Communication

Practice signalling and communication

Questions last reviewed: 18 October 2026