M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
Second Semester
Electronics
OPTICAL FIBER COMMUNICATION SYSTEMS
(CBCS 2015 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. What is meant by core in fiber?
2. What are the three mechanisms caused by absorption?
3. What is the bit rate limitation required for optical
communication?
4. What is meant by splice in fiber to fiber joints?
5. Write formula to calculate amplifier gain.
6. Write the advantages of semi conductor optical
amplifiers.
7. Write about shot noise.
8. Write expansion of MESFET.
9. What is the use of optical couplers in optical networking?
10. Write about the isolator in optical fiber communication.
Sub. Code
5MEL2C2
AFF-5065
2
Ws20
Part B x 5 25)
Answer all questions.
11. List out the types of fiber.
Or
Write short note on multipath time dispersion.
12. Give the details of source to fiber power launching.
Or
Write the principles of photo detection.
13. Explain about the LED analog modulator.
Or
Give the details of Raman amplifiers.
14. Write short notes on digital receiver.
Or
Explain the SNR (single to noise ratio) in detail.
15. Explain the WDM optical networks.
Or
Write short note on filters in optical communication.
AFF-5065
3
Ws20
Part C x 10 30)
Answer any three questions.
16. Explain about the wave propagation in GI fiber.
17. Explain the following:
LASER Diodes
PIN diode.
18. Explain about the erbium doped fiber amplifier in detail.
19. Explain the high impedance pre amplifier with suitable
diagram.
20. Explain the following:
SONET
Semi conductor optical amplifiers.
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