Optical Communication MCQ Questions & Answers

Optical Communication MCQ Questions & Answers | ECE

Learn Optical Communication MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Optical Communication MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-4 section-3

Velocity of light travelling in an optical fibre is

A) Equal to c B) Greater than c by a few percent C) Less than c by a few percent D) Much greater than c, approaching the magnitude of C²

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Answer & Solution

Answer: Option C

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In an optical fiber, dispersion:

A) Decreases with the bandwidth of light source B) Increases with the bandwidth of light source C) Is independent of light source D) Proportional to intensity of light source

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Answer: Option A

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Multimode graded index fibers are manufactured from materials with

A) Lower purity B) Higher purity than multimode step index fibers C) No impurity D) Impurity as same as multimode step index fibers

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Answer: Option B

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Which one of the following is capable of giving the highest data speed?

A) Coaxial cable link B) Microwave LOS link C) Microwave satellite system D) Optical Fiber System

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Answer: Option D

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Maximum data rate of a channel for a noiseless 2-kHz binary channel is-

A) 2000 bps B) 1000 bps C) 4000 bps D) 3000 bps

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Answer: Option C

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A digital optical fiber communication system operating at a wavelength of 1 µm requires a maximum bit error rate of 10^-9. What is the theoretical quantum limit at the receiver in terms of the quantum efficiency of the detector and the energy of an incident photon?

A) $$\frac{{20.7hf}}{\eta }$$ B) $$\frac{{10.7hf}}{\eta }$$ C) $$\frac{{20.7\eta }}{{hf}}$$ D) $$\frac{{10.7\eta }}{{hf}}$$

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Answer: Option A

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Match List-I with List-II and select the correct answer using the options given below:

List-I (Different Fibre Generation)	List-II (Optical Components Used)
a. First	1. Graded index multimode fibre and 1310 nm LD
b. Second	2. Graded index multimode fibre and 850 nm LD
c. Third	3. Step index monomode fibre and 1550 nm LD
d. Fourth	4. Step index monomode fibre and 1310 nm LD

A) a-1, b-2, c-3, d-4 B) a-2, b-1, c-3, d-4 C) a-1, b-2, c-4, d-3 D) a-2, b-1, c-4, d-3

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Answer: Option D

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The cladding which surrounds the fibre core

A) is used to protect the fibre B) is used to reduce optical interference C) helps to guide the light in the core D) ensures that refractive index remains unaltered

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Answer: Option C

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A certain optical fiber has refractive index of clad (n₁) = 1.40 and that of core (n₂) = 1.05. Its numerical aperture will be

A) 0.8575 B) 0.9260 C) 0.3500 D) 0.1585

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Answer: Option B

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Losses in optical fibers can be caused by

A) impurities B) microbending C) attenuation in the glass D) all of these

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Answer: Option D

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