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-2 section-3

Modern day optical fibers have losses of the order of

A) 10 dB/km B) 1 dB/km C) 20 dB/km D) 100 dB/km

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Answer & Solution

Answer: Option B

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Copper-network can be converted to fibre optics by using

A) fibre hubs B) media converters C) patch panel D) rewiring

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Answer & Solution

Answer: Option B

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In an optical fiber, the pulse dispersion effect is minimized by
1. Using a high frequency light source
2. Using plastic cladding
3. Minimizing the core diameter
Which of the above statements is/are correct?

A) 1 only B) 2 only C) 3 only D) 1, 2 and 3

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Answer & Solution

Answer: Option C

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In single mode fibers, the most beneficial index profile is

A) Step index B) Graded index C) Step and graded index D) Coaxial cable

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Answer: Option B

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The typical core dimensions of single mode step-index fiber is

A) 125-140 µm B) 8-50 µm C) 8-12 µm D) 50-200 µm

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Answer: Option C

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Identify the false statement for interferomatric method:

A) It is used to determine the refractive index profile of optical fiber B) It does not require Interference fringe pattern to measure refractive index C) It is used for surface topography measurement D) Instruments do not physically contact the surface under test

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Answer & Solution

Answer: Option B

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In an optical fibre, if the total internal reflection takes place, which of the following conditions have to be satisfied?

A) $${n_2} > {n_1}{\text{ and }}{\phi _1} > {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$ B) $${n_2} < {n_1}{\text{ and }}{\phi _1} > {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$ C) $${n_1} < {n_2}{\text{ and }}{\phi _1} < {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$ D) $${n_1} > {n_2}{\text{ and }}{\phi _1} > {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$

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Answer & Solution

Answer: Option B

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Non-linear Cross Phase Modulation (XPM) occurs due to

A) Difference in transmission phase of peak pulse & leading or trailing edges of pulse B) Third-order optical non-linearity C) Intensity dependence of refractive index D) Change in wavelength

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Answer & Solution

Answer: Option C

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The Dispersion Shifted fiber is normally designed to have zero chromatic dispersion at

A) 850 nm B) 1300 nm C) 1480 nm D) 1550 nm

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Answer: Option D

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An optical fibre has a reflective index of 1.641 for the core and 1.422 for the cladding. The critical angle above which the ray will be totally internally reflected is:

A) 37° B) 41° C) 45° D) 60°

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Answer & Solution

Answer: Option D

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