GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (OLD) EXAMINATION - WINTER 2018
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Subject Code:161005 Date: 20/11/2018
Subject Name: Optical Communication
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define Numerical Aperture and derive its expression for the step index fiber. [07]
(b) Explain block diagram of optical communication system with neat sketch. Explain functions of each block. [07]
Q.2 (a) Derive the equation of power coupling from LED source to step index fiber: (1) when source radius is less than fiber radius (2) when source radius is greater than the fiber radius. [07]
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(b) Discuss the various dispersion mechanisms that contribute to pulse broadening during the fiber transmission. [07]
OR
(b) With figure explain double crucible arrangement for drawing fibers from molten glass. Give the advantages of this method. [07]
Q.3 (a) Explain the high radiance surface emitting LED. Highlight the drawbacks of same and how it can reduce with the help of edge emitting LED. [07]
(b) Explain the advantages of the optical communication system using optical fiber over conventional copper system as a transmission link. State the optical transmission windows. [07]
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OR
Q.3 (a) Discuss briefly the distributed feedback' LASER with neat sketch. [07]
(b) Define the following terms related.to.photo detector. (i) Responsivity (ii) Quantum efficiency (iii) Cut off wavelength. State the responsivity of photodiode. [07]
Q.4 (a) Write a short note on fiber amplifiers. [07]
(b) What is optical coupler? Draw and explain optical coupler in detail. [07]
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OR
Q.4 (a) Explain the plasma activated chemical vapor deposition (PCVD) technique for the production of optical fiber. [07]
(b) Write short notes on Synchronous optical fiber networks(SONET) [07]
Q.5 (a) Explain Optical Time Domain Reflectometry (OTDR) method. [07]
(b) Describe briefly the losses in optical fibers. [07]
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OR
Q.5 (a) With the help of necessary figure properly explain DWDM in detail. [07]
(b) Explain (1) fusion splicing, (2) V-grove splicing and (3) elastic tube techniques for fiber splicing. [07]
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