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Posted By: Sree.... Member Level: Diamond Posted Date: 21 May 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech OPTO ELECTRONIC AND LASER INSTRUMENTATION Set No. 2 Question paper
Code No: RR321002 Set No. 2
III B.Tech II Semester Regular Examinations, Apr/May 2007
OPTO ELECTRONIC AND LASER INSTRUMENTATION
(Electronics & Instrumentation Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Briefly explain about the optical fibre construction details and show a figure for
transmission of light rays and discuss about the refractive index distribution
with a graph.
(b) Write the equations for the total internal reflection of the light rays in a optical
fibre cable and derive the expression for the Numerical Aperture of the fibre.
[8+8]
2. (a) Give any three applications of optical fibers for instrumentation and explain
them with the necessary figures.
(b) Draw the block diagram of a typical fiber optic communication system and
explain the function of each block in detail. [8+8]
3. (a) Name the first laser that was operated successfully. Explain the construction
and working principle of this laser with a neat diagram. Show the energy level
diagram also.
(b) Explain the construction and working principle of Ruby laser in detail. [8+8]
4. (a) Compare and contrast double exposure interferometry and real time interfer-
ometry.
(b) Write in detail about IR detectors. [8+8]
5. (a) What is an Evanescent sensor? Explain.
(b) Explain the principle and working of a fiber Gyroscope. [8+8]
6. With neat diagrams explain:
(a) Lasers in material processing
(b) Lasers in medicine. [8+8]
7. Write short notes on :
(a) Holograms on magnetic tape
(b) Holograms on the thermoplastic films. [8+8]
8. (a) Describe the different mechanisms that limit the frequency response of a pho-
todiode.
(b) A p.i.n. photodiode has a transit time of 2ns. and a junction capacitance of
3pf. If the load resistor is 50 ohm, find the bandwidth of the diode limited be
transit time. [8+8]
1 of 2
Code No: RR321002 Set No. 2
? ? ? ? ?
2 of 2
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