Mahatma Gandhi University (MGU) 2005 M.Sc Electronic Science Fiber Optics and their Applications - Question Paper

M.Sc. DEGREE EXAMINATION, DECEMBER 2005

Third Semester

Branch : Electronics

ME 301. FIBER OPTICS AND THEIR APPLICATIONS

Time : 3 Hours Maximum : 75 Marks

Part A

ans any 6 ques..
every ques. carries two marks.

1. State Goos-Haenchen effect.
2. What are dispersion shifted fibers?
3. What are hybrid modes? provide example.
4. What are degenerate modes?
5. What are the factors that effect the light source linearity?
6. Give industrial applications of fiber.
7. What are the advantages and disadvantages of fusion splice?
8. What is the basis of wavelength division multiplexing?
9. Define Noise figure of an optical amplifier.
(6 X two = 12 marks)

Part B

ans any 3 ques..
every ques. carries five marks.

10. Determine the core radius necessary for single mode operation at 0.82 µm of a stop index fiber with n1 = 1.480 and n2 = 1.478.
11. What are macrobending losses and microbending losses? discuss with diagram.
12. What are rate equations? discuss the rate equations for a semiconductor laser.
13. Explain a optical fiber synchronous network.
14. Give the principle and design of optical amplifiers.
(3 X five = 15 marks)

Part C

ans all ques..
every ques. carries 12 marks.

15. (a) explain the mode theory of circular wavequides.
Or
(b) discuss the structure of a graded index fiber. find an expression for power flow.
16. (a) explain the magnitude of various dispersions in different fibers.
Or
(b) explain the various scattering losses in SiO2 fiber at the operating wavelengths.
17. (a) explain the various fiber splicing techniques.
Or
(b) discuss with diagrams the different lensing schemes for coupling improvements.
18. (a) discuss the wavelength division multiplexing and demultiplexing techniques with suitable diagrams.
Or
(b) explain the classification of fiber amplifiers. Compare the advantages and disadvantages of every class.
(4 X 12 = 48 marks)

Earning:   Approval pending.