Optical Communication Mock Test 1

10%

Question 1 of 10

1. Plastic fibers are less widely used than glass fibers.

False

True

Question 1 of 10

Question 2 of 10

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

2846

2432

2136

2592

Question 2 of 10

Question 3 of 10

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

True

False

Question 3 of 10

Question 4 of 10

4. Stimulated Brillouin scattering is mainly a ___________

Forward process

Downward process

Backward process

Upward process

Question 4 of 10

Question 5 of 10

5. What is the unit of normalized frequency?

Hertz

Coulombs

It is a dimensionless quantity

Meter/sec

Question 5 of 10

Question 6 of 10

6. Which law gives the relationship between refractive index of the dielectric?

Millman’s Law

Law of reflection

Law of refraction (Snell’s Law)

Huygen’s Law

Question 6 of 10

Question 7 of 10

7. Raman and Brillouin scattering are usually observed at ___________

High optical power densities

Threshold power densities

Medium optical power densities

Low optical power densities

Question 7 of 10

Question 8 of 10

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

dB/km

Coulomb’s

Question 8 of 10

Question 9 of 10

9. If the input power 100μW is launched into 6 km of fiber, the mean optical power at the fiber output is 2μW. What is the overall signal attenuation through the fiber assuming there are no connectors or splices?

17.12dB

16.62dB

16.98dB

15.23dB

Question 9 of 10

Question 10 of 10

10. What is pulse dispersion per unit length if for a graded index fiber, 0.1μs pulse broadening is seen over a distance of 13 km?

6.12ns/km

7.69ns/km

10.29ns/km

8.23ns/km

Question 10 of 10