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Principles of Communication: Optical Fibre MCQ

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Optical FibreMediumQuestion 20247

Question

Signal transmission in optical fibre is based on:
  1. A
    Reflection from the cladding surface externally
  2. B
    Total internal reflection at the core-cladding interface
    Correct
  3. C
    Diffraction of light
  4. D
    Absorption of light

Correct answer

Total internal reflection at the core-cladding interface

Explanation

Core has higher refractive index than cladding. Rays entering within the acceptance cone undergo TIR at every core-cladding interface and propagate along the fibre with very low loss.

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