M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
First Semester
Electronics
Elective PHOTONICS AND OPTOELECTRONICS
(CBCS 2015 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. What is Coherence?
2. Define population inversion.
3. Describe briefly about LIDAR.
4. What is optical resonator?
5. What is LED?
6. Define threshold current.
7. What is an optical detector?
8. What is Knee Voltage?
9. What is photovoltaic cell?
10. What is an inverter?
Sub. Code
5MEL1E2
AFF-5063
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Wk ser
Part B x 5 25)
Answer all questions.
11. Explain about black body radiation.
Or
Mention the condition for light amplification.
12. Write down the condition for a steady state
oscillation.
Or
Explain about Lasik Surgery.
13. Write about radioactive recombination process of
LED.
Or
Explain about basic principle of LASER diode.
14. Write down the working principle of photo
conductors.
Or
Write about hetrojunction diode.
15. Explain about solar cells formation.
Or
With neat diagram, explain about battery
Charger/Discharger.
Part C x 10 30)
Answer any three questions.
16. Give a comparison between spontaneous Emission and
stimulated Emission.
17. Explain about Solid State Laser and Gas Laser.
AFF-5063
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18. Write about Internal and External quantum efficiency.
19. Write in detail about Avalanche diode.
20. Describe about the solar cell characteristic and
measurement.
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