Mahatma Gandhi University (MGU) 2007 M.Sc Electronic Science Fiber Optics and their Applications - Question Paper

M.G. UNIVERSITY

M.Sc. (ELECTRONICS) DEGREE EXAMINATION, JANUARY 2007

Third semester

FIBER OPTICS AND THEIR APPLICATIONS

Time : 3 Hours Maximum : 75 Marks

Part A

ans any 6 ques..

1. Mention 3 advantages of optical fibre as waveguide over conventional metallic waveguide.
2. What is meant by Vnumber of fiber?
3. What are intra modal dispersion and intermodal dispersion?
4. What is the effect of mode coupling on pulse distortion?
5. Define internal quantum efficiency of LED.
6. What are submerged systems?
7. What are the military applications of optical fibers?
8. Give the schematic of single-ended coaxial network that uses power splitters and combiners in star configuration.
9. Define optical bandwidth of amplifier.
(6 X two = 12 marks)

Part B

ans any 3 ques..

10. Give the various kinds of fiber along with the diagrams for refractive index profile and light ray propagation.
11. Give an account on polarization mode dipersion and refractive index profile dispersion.
12. Draw the schematic structure of hetero structure laser diode along with the importance of every layer.
13. What are local access network? discuss.
14. Explain WDM technique with suitable diagram.
(3 X five = 15 marks)

Part C

ans all ques..

15. (a) explain the propagation of meridional rays along with the acceptance angle and numerical aperture of step index fiber.
Or
(b) explain the modes in graded-index fibers.
16. (a) provide the theory of material dispersion and obtain an expression for r.m.s. material dispersion.
Or
(b) discuss the microbending losses in fibers.
17. (a) Estimate the power delivered to various kinds of fibers with respect to LEDs.
Or
(b) define the various lensing schemes used for coupling improvements.
18. (a) explain the application of optical fibers.
Or
(b) explain the principle and design of optical amplifiers.
(4 X 12 = 48 marks)

Earning:   Approval pending.