SRM University 2007 B.Tech Electronics and Communications Engineering Bank Fiber Optics and Laser Instrumentation - Question Paper

SRM University
School of Electronics and Communication Engineering

ques. Bank

Subject Code : BM 354
Subject Name : Fiber Optics and Laser Instrumentation
Class & Sem. : III Year VI Sem.

Unit – I
Part – A
1. What is refractive index? provide its relationship.
2. What is the refractive index for air, glass and water.
3. State Snell’s Law?
4. Define angle of incidence?
5. What is external reflection?
6. What is internal reflection?
7. What is total internal reflection?
8. What is critical angle of incidence?
9. What is optical fiber?
10. What are modes of wave guides?
11. Show the schematic structure of optical fiber.
12. Why refractive index of cladding is less than the refractive index of core?
13. What are the kinds of fiber? discuss.
14. What is the purpose of cladding and buffer coating?
15. What are the advantages and disadvantages of multimode fiber?
16. What is intermodal distortion or dispersion?
17. What is ray congruence?
18. What are meridional rays? How are they classified?
19. What are skew rays?
20. Give the formula for numerical aperture.
21. What are conditions that a fiber material should satisfy?
22. What are advantages and disadvantages for selecting glass as fiber material?
23. What is attenuation?
24. How absorption is caused?
25. How scattering loss is caused?
26. What is core cladding loss?
27. What is intramodal dispersion or distortion?
28. What is intermodal delay?
29. What is group delay?
30. What is pulse broadening?
Part – B
31. Explain in detail about optical fiber and its modes?
32. Explain about the ray optic representation.
33. Explain about step index fiber structure and graded index fiber structure.
34. Explain in detail about attenuation and its causes.
35. Explain about Signal degradation or distortion.
36. What is pulse broadening? discuss about the pulse broadening in graded index fiber .
37. Write notes on group delay?

Unit – II
Part – A
1. What is an optical sensor?
2. What are fiber optic probes?
3. State interferometric concept?
4. What are fiber optic gyroscopes?
5. What is micro bending?
6. What are various kinds of interferometry?
7. State the concepts behind liquid level sensors.
8. What is reciprocity?
9. What are resonators?
10. What is Bragg grating sensor concept?
11. Define modal Birefringence?
12. What are the 2 modes of operation in single mode fibers?
13. List the methods used to maintain polarization?
14. What is known as sagnac effect?
15. Draw the response curve of a reflective fiber optic sensor.

Part – B
1. Explain about liquid level sensors.
2. Write about pressure sensors in detail.
3. What are temperature sensor and explain?
4. Explain about the various kinds of interferometer.
5. Explain the concept of polarization in optical fibers and explain the polarization sensors.

Earning:   Approval pending.