Optical Communication Mock Test 1

10%

Question 1 of 10

1. Raman and Brillouin scattering are usually observed at ___________

Low optical power densities

High optical power densities

Threshold power densities

Medium optical power densities

Question 1 of 10

Question 2 of 10

2. Stimulated Brillouin scattering is mainly a ___________

Forward process

Upward process

Downward process

Backward process

Question 2 of 10

Question 3 of 10

3. A multimode fiber has refractive indices n1 = 1.15, n2 = 1.11 and an operating wavelength of 0.7μm. Find the radius of curvature?

10.2μ_m

8.60μ_m

9.30μ_m

9.1μ_m

Question 3 of 10

Question 4 of 10

4. What is needed to predict the performance characteristics of single mode fibers?

Geometric distribution of light in a propagating mode

The intermodal delay effect

Fractional power flow in the cladding of fiber

Normalized frequency

Question 4 of 10

Question 5 of 10

5. How many propagation modes are present in single mode fibers?

Three

Five

One

Two

Question 5 of 10

Question 6 of 10

6. An optical fiber has a core radius 2μm and a numerical aperture of 0.1. Will this fiber operate at single mode at 600 nm?

Yes

Question 6 of 10

Question 7 of 10

7. Rayleigh scattering and Mie scattering are the types of _____________

Linear scattering losses

Non-linear scattering losses

Splicing losses

Fiber bends losses

Question 7 of 10

Question 8 of 10

8. A step-index fiber has core refractive index 1.46 and radius 4.5μm. Find the cutoff wavelength to exhibit single mode operation. Use relative index difference as 0.25%.

1.326μm

0.124μm

0.123μm

1.214μm

Question 8 of 10

Question 9 of 10

9. The optical fiber incurs a loss in signal power as light travels down the fiber which is called as ___________

Attenuation

Refraction

Absorption

Scattering

Question 9 of 10

Question 10 of 10

10. A graded-index fiber has a core with parabolic refractive index profile of diameter of 30μm, NA=0.2, λ=1μm. Estimate the normalised frequency.

16.28

17.12

18.84

19.32

Question 10 of 10