OPTICAL FIBRE COMMUNICATION (OFC) DECEMBER 2012 ELECTRONICS AND TELECOMMUNICATION SEMESTER 8
(REVISED COURSE) KR-4695
(3 Hours) [Total Marks : 100]
(2) Attempt any four questions out of remaining six questions.
(3) Figure to the right indicate full marks.
| 1. (a) | What are the advantages of optical fiber Communication ? | 20 |
| (b) | Explain Badwidth distance product. | |
| (c) | What are Linearly Polarized modes ? | |
| (d) | Compare direct band and indirect band semi conductors. | |
2. (a) | Derive the expression for Numerical Aperture of a step -index fiber. What will | 10 |
| happen to N. A, If Cladding is removed ? | ||
| (b) | Compare step index and graded index fiber. | 10 |
3. (a) | Starting from Maxwell's equation, derive the wave equation for step index fiber. | 10 |
| (b) | Explain the signifiance of V-number. Derive the expression for number of guided | 10 |
| modes in graded index fiber. | ||
4. (a) | What do you understand by intramodal dispersion ? Derive the expression for | 10 |
| material dispersion. | ||
| (b) | What are the reasons for signal attenuation in a optical fiber ? | 10 |
5. (a) | Give the structure of a surface emitting LED. Compare with an edge | 10 |
| emitting LED. | ||
| (b) | Explain Avalanche Photodiode with proper structure and electric field. What is | 10 |
| multiplication factor ? | ||
6. (a) | What are splices ? Explain different types of splies. | 10 |
| (b) | Explain double Crucible method of fiber fabrication. | 10 |
7. | Write short notes on any two :- | 20 |
| (i) Linearly polarized modes | ||
| (ii) OTDR | ||
| (iii) Link Power Bugeting. |
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