STUPIDSID
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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