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-2

Intermodal dispersion in multimode fibers is minimized with the use of step-index fibers.

A) True B) False

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Answer & Solution

Answer: Option B

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Losses in photonic crystal fibers are reduced to a level of . . . . . . . .

A) 0.1dB/km B) 0.2dB/km C) 0.3dB/km D) 0.4dB/km

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Answer: Option C

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Which is the unit of measurement of attenuation in optical fibers?

A) km B) dB C) dB/km D) Coulomb's

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Answer: Option C

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Dominant intrinsic loss mechanism in low absorption window between ultraviolet and infrared absorption tails is . . . . . . . .

A) Mie scattering B) Rayleigh scattering C) Stimulated Raman scattering D) Stimulated Brillouin scattering

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Answer: Option B

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In index-guided photonic crystal fiber structure, the dark areas are air holes. What does white areas suggests?

A) Air B) Silica C) Water D) Plasma

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Answer: Option D

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After Total Internal Reflection the Meridional ray . . . . . . . .

A) Makes an angle equal to acceptance angle with the axial ray B) Makes an angle equal to critical angle with the axial ray C) Travels parallel equal to critical angle with the axial ray D) None of the above

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Answer: Option D

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A multimode fiber has RMS pulse broadening per km of 12ns/km and 28ns/km due to material dispersion and intermodal dispersion resp. Find the total RMS pulse broadening.

A) 30.46ns/km B) 31.23ns/km C) 28.12ns/km D) 26.10ns/km

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Answer: Option A

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The index profile of a core of multimode graded index fiber is given by?

A) $$N\left( r \right) = n1{\left[ {1 - 2\Delta {{\left( {\frac{{{r^2}}}{a}} \right)}^2}} \right]^{\frac{1}{2}}};r < a$$ B) $$N\left( r \right) = n1{\left[ {3 - 2\Delta {{\left( {\frac{{{r^2}}}{a}} \right)}^2}} \right]^{\frac{1}{2}}};r < a$$ C) $$N\left( r \right) = n1{\left[ {5 - 2\Delta {{\left( {\frac{{{r^2}}}{a}} \right)}^2}} \right]^{\frac{1}{2}}};r > a$$ D) None of the above

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Answer: Option A

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A multimode step index fiber has a normalized frequency of 72. Estimate the number of guided modes.

A) 2846 B) 2592 C) 2432 D) 2136

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Answer: Option B

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Stimulated Raman scattering may have an optical power threshold of may be three orders of magnitude . . . . . . . .

A) Lower than Brillouin threshold B) Higher than Brillouin threshold C) Same as Brillouin threshold D) Higher than Rayleigh threshold

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Answer: Option B

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