Question Paper: Broadband Communication Systems Question Paper - May 2017 - Electronics and Telecom Engineering (Semester 8) - Savitribai Phule Pune University (SPPU)
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## Broadband Communication Systems - May 2017

### SPPU Electronics and Telecom Engineering (Semester 8)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

### Solve any one question from Q.1(a,b) &Q.2(a,b)

1(a) What are photodetectors? Explain with diagram working of Avalanche photodiode (APD) 6 marks

1(b) What is linear scattering? Explain in brief.
i) Rayleigh Scattering?
ii) Mie Scattering.
6 marks

2(a) What are graded index fibers? Explain with diagram how does ray transmisssion takes place in the graded Index Multimode fibe. 6 marks

2(b) A Multimode Graded index fiber exhibits total pluse brodening of 0.1 μsec over a distance of 15km. Estimate.
i) The maximum possible Band width on the Link assuming no inter symbol Interference.
ii) The pulse dispersion per unit length
iii) The Bandwidth length product for the fiber.
6 marks

### Solve any one question from Q.3(a,b) &Q.4(a,b)

3(a) What are various types of optical sources? Explain with diagram and characteristics working of LED. State its specifications, advantages and disadvantages. 6 marks

3(b) What is EDFA? Explain. 6 marks

4(a) What is the need of optical power budget? Explain Link power budget with the help of optical power loss model for a point to point communication. 6 marks

4(b) What is multichannel transmission in optical (fibers) links? Explain any one method to achieve multichannel transmission. 6 marks

### Solve any one question from Q.5(a,b) &Q.6(a,b)

5(a) What are the Elements of satellite communication? Explain with basic structure of satellite communication. 6 marks

5(b) Compare LEO, MEO, & GEO satellite orbits with its application. 6 marks

6(a) Explain various Look angles for satellite communication. 6 marks

6(b) Describe the Launch sequence used in Inject satellite. 6 marks

### Solve any one question from Q.7(a,b) &Q.8(a,b)

7(a) What are various losses in uplink and downlink analysis? Explain. 6 marks

7(b) What are orbital effects in communication system performance? Explain 6 marks

8(a) What are different types of Antennas used in satellite systems? Explain importance of each. 6 marks

8(b) Explain the following
i) Communication subsystem.
ii) Antenna subsystem.
6 marks

### Solve any one question from Q.9(a,b) &Q.10(a,b)

9(a) Explain the procedure of for satellite communication link Design 6 marks

9(b) Explain any two.
i) Attitude control system.
ii) Orbital control system.
iii) Tracking, telemetry and command system.
6 marks

10(a) State and Explain Kepler's three Laws of planetary motion. 6 marks

10(b) Explain system noise temperature and GTGT \frac{G}{T}/ 6 marks

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