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Question 20287
JEE Physics · Hard

Principles of Communication: Optical Fibre MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Optical FibreHardQuestion 20287

Question

Wavelength Division Multiplexing (WDM) in optical fibre allows:
  1. A
    Multiple data streams on different optical wavelengths (colours) in one fibre
    Correct
  2. B
    Conversion of optical to radio
  3. C
    Time-sharing of the fibre by different users
  4. D
    Frequency modulation of the optical carrier

Correct answer

Multiple data streams on different optical wavelengths (colours) in one fibre

Explanation

DWDM (Dense WDM) carries 40–160 channels at different wavelengths (around 1550 nm, channel spacing 0.8 nm). Each channel can carry 100 Gbps → single fibre capacity > 10 Tbps. The Internet backbone relies on DWDM.

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