2008 Calicut University B.E Electronics and Instrumentation EIGHT SEMESTER B.TECH (ENGINEERING) DEGREE EXAMINATION - OPTOELECTRONIC INSTRUMENTATION

2008 Calicut University B.E Electronics and Instrumentation EIGHT SEMESTER B.TECH (ENGINEERING) DEGREE EXAMINATION - OPTOELECTRONIC INSTRUMENTATION Question paper
EIGHT SEMESTER B.TECH (ENGINEERING) DEGREE EXAMINATION,JUNE 2008
AI 04 803 – OPTOELECTRONIC INSTRUMENTATION
(2004 admissions)

Time: Three hours Maximum:100 Marks

Answer all questions
1.Part A: (8*5=40 marks)
a) Write the principle of liquid crystal displays.
b) List the characteristics of light sources.
c) What is Q- Switching? Explain.
d) What is meant by population inversion?
e) Write the concept of holography.
f) List the properties of multi - mode fiber.
g) Explain refractive index profile measurement in optical fibres.
h) Write the principle of fibre optic sensors.

Part B:(4*15=60 marks)
2. (a) I. Discuss the principle of acoustic optic modulators.(8 marks)
II. Write the concept of Tymann-Green interferometer.(7 marks)
Or
(b) Discuss the principle of PIN diodes and avalanche photodiodes.(15 marks)

3.(a) Discuss the principle of gas and liquid dye lasers.(15 marks)
Or
(b) Explain velocity and distance measurements.(15 marks)

4.(a) (i) Compare step index and graded index fibres.(7 marks)
(ii) Compare single mode and multi mode fiber.(8 marks)
Or
(b) Discuss the fiber drawing process.(15 marks)

5. (a) Discuss the recent trends in fiber optic communication.(15 marks)
Or
(b) Explain the operation of optical time domain reflectometer (OTDR).(15 marks)