PREVIOUS EXAMINATION QUESTIONS IN FIBER OPTICS

1.      Explain the principle of an optical fiber.

2.      Describe the fiber construction.

3.      Describe the function of single mode step index optical fiber along with its refractive index profile.

4.      Explain why step index optical fiber is of reflective type.

5.      Explain why graded index optical fiber is of refractive type.

6.      Explain the advantages of graded index optical fiber when compared to step index optical fiber.

7.      Describe the function of multi mode step index optical fiber along with its refractive index profile.

8.      Distinguish between single mode and multi mode step index optical fibers.

9.      What is total internal reflection? Discuss its importance in optical fiber.

10.  Describe the construction of a typical optical fiber along with the dimensions of the various parts.

11.  What is acceptance angle of an optical fiber and derive an expression for it.

12.  A fiber has a core refractive index of 1.44 and cladding refractive index of 1.4. Find its acceptance angle.

13.  What is the Numerical aperture of an optical fiber and derive an expression for it.

14.  A fiber has a core refractive index of 1.55 and cladding refractive index of 1.50.Find its Numerical aperture.

15.  Describe briefly the different types of optical fibers with neat diagrams.

16.  Calculate the refractive indices of core and cladding of an optical fiber with a numerical aperture of 0.33 and their fractional change of refractive indices being 0.02.

17.  Discuss the minimization of modal dispersion in the graded index optical fiber.

18.  An optical fiber has a numerical aperture of 0.20 and cladding refractive index of 1.59.Determine the refractive index of core and the acceptance angle for the fiber in water which has a refractive index of 1.33.

19.  What are the conditions to produce total internal reflection in optical fiber.

20.  Describe the structure of different types of optical fibers with ray paths.

21.  Explain the role of optical fibers in medicine and industry.

22.  Define acceptance angle and numerical aperture. Obtain the expression for the numerical aperture of an optical fiber.

23.  Calculate the acceptance angle and numerical aperture for an optical fiber with core and cladding refractive indices being 1.48 and 1.45 respectively.

24.  What is the principle of an optical fiber communication? Explain.

25.  Explain the advantages of optical fiber communication system.

26.  The numerical aperture of an optical fiber is0.39. If the differences in the refractive indices of the material of its core and the cladding are 0.05, calculate the refractive index of material of the core.

27.  Calculate the angle of acceptance of a given optical fiber, if the refractive indices of the core and cladding are 1.563 and 1.498 respectively.

28.  If the numerical aperture of a fiber is 0.245 with a core refractive index 1.51, calculate the refractive index of cladding as well as acceptance angle.

29.  Calculate the refractive indices of core and cladding of an optical fiber with a numerical aperture of 0.33 and their fractional difference of refractive indices being 0.02.