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Optical Communication Systems

Total questions: 6

Worksheet time: 3mins

Name
Class
Date
1.

To obtain a power of 1μW of light at a wavelength of 0.85 μm, how many photons are needed per second?

a)
4.29 x 10^12
b)
8.67 x 10^11
c)
2.15 x 10^12
d)
1.00 x 10^13
2.

What happens when light strikes a point of change in the refractive index and scatters in all directions?

a)
Light reflects off the surface without scattering.
b)
Light travels in a straight line without any change.
c)
Light scatters in all directions due to changes in the refractive index.
d)
Light is absorbed completely without scattering.
3.

If light leaves a material with a refractive index of 1.45 and penetrates the boundary into another material with a refractive index of 1, what will be the Fresnel loss?

a)
2.10%
b)
5.00%
c)
3.65%
d)
1.25%
4.

Calculate the angle labeled θ2 in the image below. The first material has a refractive index (n1) of 1.51 and the angle of incidence (θ1) is 38˚, while the second material has a refractive index (n2) of 1.46.

a)
θ2 ≈ 41.2°
b)
θ2 ≈ 39.8°
c)
θ2 ≈ 45.0°
d)
θ2 ≈ 35.5°
5.

The event of light reflection occurs when the angle of incidence is such that the angle of refraction is exactly 90˚, causing the light to travel parallel to the boundary within the second material. From Snell's Law, n1 sin θ1 = n2 sin θ2, what is the critical angle?

a)
θc = arcsin(n2/n1)
b)
θc = n1 + n2
c)
θc = sin(n1/n2)
d)
θc = n1/n2
6.

A beam of light travels in a transparent material with a refractive index of 1.51 and approaches the boundary towards a second material with a refractive index of 1.46. Calculate the critical angle for the light to travel parallel to the boundary in the second material.

a)
30 degrees
b)
75 degrees
c)
45 degrees
d)
60 degrees