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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. 4 Question paper
Code No: RR321002 Set No. 4
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) What is the necessity of optical fibers in communication explain the steps in-
volved in developing a communication system using optical fibers with figures.
(b) List out the applications of optical fibers in Instrumentation and explain the
operation of one instrument using optical fibers with a figure. [8+8]
3. (a) Explain synchronously mode-locked laser system.
(b) Find maximum power, threshold population density, pulse duration and total
energy of a Q switched pulse for a ruby laser with following characteristics
Length of the rod = 0.1m, area of cross section = 1 cm2,
resonator length = 10 cm, mirror reflectivity = 1 and 0.7,
Cr3+ population density = 1.58* 1019 /cm3 ,?0 = 6943 A0 ,
n0= 1.76, t
sp = 3*10-3s, g(?0)= 1.1*10-12 s. [8+8]
4. (a) Describe the working of Moire-fringe modulation fiber optic sensor.
(b) Write in detail about IR sources. [8+8]
5. (a) Differentiate between a transducer and a sensor.
(b) Explain a method for measurement of current by a single mode fiber optic
sensor with the help of a diagram.
(c) How do you estimate the transmission line loss using the above sensor.
[5+6+5]
6. With neat diagrams explain the following applications of lasers in detail :
(a) Lasers in material processing.
(b) Laser fusion in power plants. [8+8]
7. (a) With the help of neat sketches explain reconstruction of hologram with a wave
identical to reference wave and with a wave conjugate to reference wave?
(b) Explain in detail various recording and reconstruction devices of hologram?
[8+8]
1 of 2
Code No: RR321002 Set No. 4
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]
? ? ? ? ?
2 of 2
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