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Seat No.: Enrolment No.:
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER • EXAMINATION SUMMER 2018
Subject Code: 2351102 Date: 01 05 -2018
Subject Name: Fiber Optic 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.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1

Discuss the advantages of Fiber Optic Communication.
07





List explain types of fiber with reference to mode refractive index profile.
07



Q.2

Define Acceptance angle and Numerical aperture. Derive the equation for NA.
07


Acceptance angle Numerical aperture NA


Explain double crucible method for fiber drawing.
07

Fiber drawing

OR

List various types of Splicing techniques and explain any one in detail.
07



Q.3

What is dispersion? Explain difference between intermodal intramodal dispersion.
07





Explain construction and working of photo diode.
07

PIN

OR
Q.3

Explain absorption, spontaneous emission and stimulated emission process with energy state diagram.
07





Compare LED with semiconductor LASER diode.
07

LED LASER

Q.4

Explain optical coupler.
07
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Explain regenerative repeater for fiber optic communication.
07



OR
Q.4

Explain fiber bragg grating in brief.
07





Explain cutback technique to measure attenuation of an optical fiber.
07



Q.5

Explain various multiplexing techniques in optical fibre communication.
07





Draw the block diagram of optical receiver and explain function of each block.
07

Optical receiver

OR
Q.5

Explain optical power meter optical attenuator.
07





Explain OTDR with block diagram.
07

OTDR