MU Electronics and Telecom Engineering (Semester 7)
Optical Communication & Networks
May 2015
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) Draw the refractive index profile with dimensions of different types of Fibre.
5 M
1 (b) Describe the concept of WDM.
5 M
1 (c) Distinguish Spontaneous and Stimulated Emission.
5 M
1 (d) Describe the Eye diagram as applicable to Optical Fibre Communications.
5 M

2 (a) Explain any one Fibre fabrication process with neat diagram. Compare the different methods of fabrication.
10 M
2 (b) Starting from Maxwell's equation derive the wave equation for Step Index Fibre.
10 M

3 (a) Explain the Signal Attenuation in optical Fibre and plot the three windows.
10 M
3 (b) Describe the intermodal delay and intramodal dispersion in optical Fibre.
10 M

4 (a) Describe with diagram the structure of distributed feedback laser diode.
10 M
4 (b) A silicon avalanche photo-diode has a quantum efficiency of 65 percent at a wavelength of 900mm. Suppose 0.5 7mu;W of optical power produces a multiplied photo-current of 107mu;A. Find the multiplication M.
10 M

5 (a) Describe the different types of pre amplifiers used in optical receivers.
10 M
5 (b) Explain with diagram the setup for making pulse dispersion measurements in time domain.
10 M

6 (a) Why Link Power Budget is important in optical Fibre communication system? Explain with an example.
10 M
6 (b) Explain the different types of detections in Coherent systems.
10 M

Write short notes on any four:
7 (a) OTDR
5 M
7 (b) Fibre materials
5 M
7 (c) Zero dispersion wavelength
5 M
7 (d) Linearly polarised modes
5 M
7 (e) Mode coupling
5 M



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