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Question 20248
JEE Physics · Hard

Principles of Communication: Optical Fibre MCQ

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Optical FibreHardQuestion 20248

Question

Which frequency range is used in optical fibre communication?
  1. A
    Radio waves (kHz–MHz)
  2. B
    Infrared/visible light (10¹² – 10¹⁵ Hz)
    Correct
  3. C
    X-rays (10¹⁸ Hz)
  4. D
    Microwaves (GHz)

Correct answer

Infrared/visible light (10¹² – 10¹⁵ Hz)

Explanation

Optical fibres operate at 850 nm, 1310 nm, or 1550 nm (minimum loss window). These correspond to ~3×10¹⁴ Hz. The enormous carrier frequency allows terabit/s bandwidths — far beyond microwaves.

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