SRM University 2007 B.Tech Electronics and Communications Engineering Bank Optical Networks - Question Paper

31. Calculate the pth (SRS) and Pth (SBS) for a fiber with Aeff=72 micrometrer =2 and Leff=20km.
32. What is WDM
33. What are the components used in an optical network?
34. What is the function of an optical amplifier?
35. What are 3 functional kinds of optical amplifier?
36. What is Crosstalk in SOA?
37. What are the 2 major mechanism that reason crosstalk?
38. What is amplified spontaneous emission?
39. Why is erbium used in EDFA?
40. What phenomenon determines the bandwidth of an EDFA
41. What is the function of coupler?
42. Name and define 2 major classes of filters
43. What are the basic characteristics of a filter?
44. Give examples of reciprocal and nonreciprocal devices
45. Explain the function of circulators and isolators.

PART B

1. List the major Causes of Attenuation in an optical fiber & discuss their mechanism
2. Explain in detail about light propagation in a fiber?
3. List 3 major causes of dispersion in an optical fiber & discuss their mechanism
4. Explain the principle of operation of a semiconductor optical amplifier (SOA)?
5. Show the structure of an EDFA & discuss the function of every component
6. Explain how stimulation emission occurs in an EDFA
7. What is the function & the principle of operation of an isolator? provide Eg. Of isolator Applications
8. What is the function & the principle of operation of operation of a circulator? provide E.g. Of its application
9. Explain the function of Optical switches
10. Explain about Nonlinearity effects in a fiber
11. Explain the principle of operation of Fabry Perot (FP) filter?
12. Explain the principle of operation of Mach Zehnder Interferometer (MZI)?
13. Explain the function & the Principle of operation of Wavelength Converters?



UNIT II - Modulation, Demodulation & Design Consideration

PART A

1. Define Optical Sources
2. Show the diagram of fiber optic communication system
3. Draw the block diagram of Optical Transmitter?
4. Draw the block diagram of Optical Receiver
5. What are the advantages of optical fiber?
6. What are the major advantages of hetrostructured LED over a homostructured one?
7. What is the difference ranging from a surface emitting LED (SLED) & Edge emitting LED (ELED)
8. What are the drawbacks of homostructured LED?
9. Calculate the internal quantum efficiency of a 1.3micro meter SLED at a forward current of 100mA assuming that 75% of the LEDs output power is coupled into an optical fiber?

Earning:   Approval pending.