Optical Communication EC-703
Important Questions
1. Write Laws of Reflection and Refraction.
2. What is Total Internal Reflection explain
3. Explain Optical Spectral Bands
4. Explain Electromagnetic mode theory concept for Optical Propagation
5. Write Key Elements of optical communication system.
6. Define Numerical Aperture.
7. Explain various advantages of optical communication system.
8. Explain optical fiber as a dielectric slab waveguide.
9. Describe V-parameter.
10. Write the properties required in material to fabricate optical fiber.
11. What do you understand by mode field diameter?
12. Explain Power Flow in S.I. Optical Fiber.
13. Explain Graded index fiber structure.
14. Explain Step index fiber structure.
15. A silica glass optical fiber has a core refractive index of 1.400 and cladding
refractive index of 1.350. Calculate critical angle, acceptance angle and Numerical
Aperture.
16. Explain Plasma Activated Vapor Phase Deposition (PCVD) and Vapor phase axial
deposition (VAD) process of fiber fabrication.
17. Write the properties required in LED as an Optical Source.
18. Differentiate between spontaneous and stimulated emission.
19. What is quantum efficiency? Find Expression for this.
20. Explain Surface emitting and edge emitting LED.
21. Explain the advantages of optical fibers over copper wires.
22. Mention windows of spectrum used in optical communication.
23. Describe outside vapor phase oxidation (OVPO) technique of fiber fabrication.
24. Explain different materials used in LED.
25. Define internal quantum efficiency of LED and find expression for LED power.
26. What is fiber splicing? Explain at least one method.
27. Explain following: (i) Active Glass Fiber (ii) Plastic Optical Fiber
28. How population inversion is achieved in LASER what are the threshold
conditions, find the gain of a LASER.
29. Explain various types of optical connectors.
30. Calculate the numerical aperture of step index fiber having n1=1.48 n2=1.46 what
is the maximum entrance angle θ0 (max) for this fiber if outer medium is air.