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Question 20258
JEE Physics · Medium

Principles of Communication: Optical Fibre MCQ

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Optical FibreMediumQuestion 20258

Question

An advantage of optical fibre over copper cables is:
  1. A
    Lower cost per metre
  2. B
    Can carry electrical current
  3. C
    Much higher bandwidth and immunity to electromagnetic interference
    Correct
  4. D
    Operates at radio frequencies

Correct answer

Much higher bandwidth and immunity to electromagnetic interference

Explanation

Optical fibres: (1) Carrier frequency ~10¹⁴ Hz → terabit/s capacity; (2) EMI immune (non-conductive glass); (3) Low loss (~0.2 dB/km at 1550 nm vs ~10 dB/km for coax); (4) Secure (hard to tap without disrupting signal).

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