Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem Old 161005 Optical Communication Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:161005 Date: 20/11/2018
Subject Name: Optical Communication
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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
(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
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
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
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
*************
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020