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Question 20270
JEE Physics · Medium

Semiconductors: Semiconductor Device Applications MCQ

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Semiconductor Device ApplicationsMediumQuestion 20270

Question

Which device is used for generating light in fiber optic communication?
  1. A
    Photodiode
  2. B
    Zener diode
  3. C
    LED or laser diode
    Correct
  4. D
    Tunnel diode

Correct answer

LED or laser diode

Explanation

LEDs and laser diodes convert electrical energy to light (electroluminescence). In fiber optics: laser diodes are used for long-distance (coherent, narrow linewidth); LEDs for shorter distances. The light is coupled into the optical fiber for data transmission.

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