Optical Communication Mock Test 2

10%

Question 1 of 10

1. What is a fundamental necessity in the fabrication of fibers for light transmission?

Material composition of fiber

Pump source

Same refractive index for both core and cladding

Variation of refractive index inside the optical fiber

Question 1 of 10

Question 2 of 10

2. A GaAs optical source having a refractive index of 3.2 is coupled to a silica fiber having a refractive index of 1.42. Determine Fresnel reflection at interface in terms of percentage.

17.4%

17.6%

14.8%

13.4%

Question 2 of 10

Question 3 of 10

3. The cable must be designed such that the strain on the fiber in the cable does not exceed __________

0.160%

0.2%

0.01%

0.002%

Question 3 of 10

Question 4 of 10

4. Fiber drawing using preform was useful for the production of graded index fibers.

True

False

Question 4 of 10

Question 5 of 10

5. How many categories exists in case of cable design?

One

Two

Four

Three

Question 5 of 10

Question 6 of 10

6. What is the Young’s modulus of Kevlar, an aromatic polyester?

9 ×10¹⁰Nm^-2

13 ×10¹⁰Nm^-2

10 ×10¹⁰Nm^-2

12 ×10¹⁰Nm^-2

Question 6 of 10

Question 7 of 10

7. A polarization maintaining fiber operates at a wavelength 1.2μm and have a modal birefringence of 1.8*10^-3. Calculate the period of perturbation.

0.5 seconds

0.7 seconds

0.6 seconds

0.23 seconds

Question 7 of 10

Question 8 of 10

8. The radiation-induced attenuation can be reduced through photo-bleaching.

False

True

Question 8 of 10

Question 9 of 10

9. At what temperature range, does the melting of multi components glass systems takes place?

600-800 degree Celsius

1500-1800 degree Celsius

900-1300 degree Celsius

100-300 degree Celsius

Question 9 of 10

Question 10 of 10

10. An Si-O bond with a Young’s modulus of 9*10¹⁰Nm^-1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.

6.32*10⁹Nm^-1

3*10⁹Nm^-1

4.32*10⁹Nm^-1

5.2*10⁹Nm^-1

Question 10 of 10