Transmission Characteristics of Optical Fibers MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Transmission Characteristics of Optical Fibers, a fundamental topic in the field of Optical Communication. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Transmission Characteristics of Optical Fibers MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Transmission Characteristics of Optical Fibers mcq questions that explore various aspects of Transmission Characteristics of Optical Fibers problems. Each MCQ is crafted to challenge your understanding of Transmission Characteristics of Optical Fibers principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Optical Communication tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Transmission Characteristics of Optical Fibers MCQs are your pathway to success in mastering this essential Optical Communication topic.

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Transmission Characteristics of Optical Fibers MCQs | Page 5 of 9

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Q41.
The index profile of a core of multimode graded index fiber is given by?

a.

N (r) = n1 [1 – 2Δ(r²/a)²]½; r<a

b.

N (r) = n1 [3 – 2Δ(r²/a)²]½; r<a

c.

N (r) = n1 [5 – 2Δ(r²/a)²]½; r>a

d.

N (r) = n1 [1 – 2Δ(r²/a)²]½; r<a

Discuss
Answer: (d).N (r) = n1 [1 – 2Δ(r²/a)²]½; r<a
Q42.
Intermodal dispersion in multimode fibers is minimized with the use of step-index fibers.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q43.
Estimate RMS pulse broadening per km due to intermodal dispersion for multimode step index fiber where length of fiber is 4 km and pulse broadening per km is 80.6 ns.

a.

18.23 ns/km

b.

20.15 ns/km

c.

26.93 ns/km

d.

10.23 ns/km

Discuss
Answer: (b).20.15 ns/km
Q44.
Practical pulse broadening value for graded index fiber lies in the range of __________

a.

0.9 to 1.2 ns/km

b.

0.2 to 1 ns/km

c.

0.23 to 5 ns/km

d.

0.45 to 8 ns/km

Discuss
Answer: (b).0.2 to 1 ns/km
Q45.
The modal noise occurs when uncorrected source frequency is?

a.

δf>>1/δT

b.

δf=1/δT

c.

δf<<1/δT

d.

Negligible

Discuss
Answer: (a).δf>>1/δT
Q46.
Disturbance along the fiber such as vibrations, discontinuities, connectors, splices, source/detectors coupling result in __________

a.

Modal noise

b.

Inter-symbol interference

c.

Infrared interference

d.

Pulse broadening

Discuss
Answer: (a).Modal noise
Q47.
The modal noise can be reduced by __________

a.

Decreasing width of signal longitudinal mode

b.

Increasing coherence time

c.

Decreasing number of longitudinal modes

d.

Using fiber with large numerical aperture

Discuss
Answer: (d).Using fiber with large numerical aperture
Q48.
Digital transmission is more likely to be affected by modal noise.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q49.
A multimode step index fiber has source of RMS spectral width of 60 nm and dispersion parameter for fiber is 150 psnm⁻¹km⁻¹. Estimate rms pulse broadening due to material dispersion.

a.

12.5 nskm⁻¹

b.

9.6 nskm⁻¹

c.

9.0 nskm⁻¹

d.

10.2 nskm⁻¹

Discuss
Answer: (c).9.0 nskm⁻¹
Q50.
A multimode fiber has RMS pulse broadening per km of 12 ns/km and 28 ns/km due to material dispersion and intermodal dispersion resp. Find the total RMS pulse broadening.

a.

30.46 ns/km

b.

31.23 ns/km

c.

28.12 ns/km

d.

26.10 ns/km

Discuss
Answer: (a).30.46 ns/km
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