MU Electronics and Telecom Engineering (Semester 7)
Optical Communication & Networks
December 2012
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) What are the advantages of Optical Fiber Communication?
5 M
1(b) Explain Bandwidth distance product.
5 M
1(c) What are Linearly Polarized modes?
5 M
1(d) Compare direct band and indirect band semi conductors.
5 M

2(a) Derive the expression for numerical aperture of a step-index fiber. What will happen to N.A. if cladding is removed?
10 M
2(b) Compare step index and graded index fiber.
10 M

3(a) Starting from Maxwell's equations, derive the wave equation for step index fiber
10 M
3(b) Explain the significance of V-number. Derive the expression for number of guided modes in graded index fiber.
10 M

4(a) What do you understand by intramodal dispersion? Derive the expression for material dispersion.
10 M
4(b) What are the reasons for signal attenuation in an optical fiber
10 M

5(a) Give the structure of the surface emitting LED. Compare with an edge emitting LED.
10 M
5(b) Explain Avalanche Photodiode with proper structure and electric field. What is multiplication factor?
10 M

6(a) What are splices? Explain different types of splices.
10 M
6(b) Explain Double Crucible method of fiber fabrication.
10 M

Write short notes on any two:
7(a) Linearly polarized modes
10 M
7(b) OTDR
10 M
7(c) Link Power Budget
10 M



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