Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2161005 Optical Communication Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161005 Date:21/05/2019
Subject Name:Optical Communication
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define : Skew ray, Meridional ray.
03
(b) Compare single mode and Multi mode step index and graded index
optical fiber
04
(c) List the factors that decide the performance of optical reception and
explain it. Also draw and explain eye diagram in detail.
07
Q.2 (a) Explain various fiber modes
03
(b) Explain scattering loss in optical fiber.
04
(c) Explain with neat and clean diagram : The plasma activated chemical
vapor deposition (PCVD) technique for the production of optical fiber
07
OR
(c) A multimode step index fiber with a core diameter of 100 ?m and a
relative index difference of 1.5% is operating at a wavelength of 0.85
?m. If the core refractive index is 1.485, calculate: (i) Normalized
frequency of fiber (ii) Total number of guided modes.
07
Q.3 (a) Compare Direct band gape and Indirect band gape materials
03
(b) Explain structure of Edge double hetero junction LED
04
(c) Derive the equation for the power launched from LED Source in to a S.I.
fiber
07
OR
Q.3 (a) Compare LED and LASER diode as a light source in fiber optic
communication
03
(b) Explain structure of Surface LED
04
(c) Derive LASER rate equation
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161005 Date:21/05/2019
Subject Name:Optical Communication
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define : Skew ray, Meridional ray.
03
(b) Compare single mode and Multi mode step index and graded index
optical fiber
04
(c) List the factors that decide the performance of optical reception and
explain it. Also draw and explain eye diagram in detail.
07
Q.2 (a) Explain various fiber modes
03
(b) Explain scattering loss in optical fiber.
04
(c) Explain with neat and clean diagram : The plasma activated chemical
vapor deposition (PCVD) technique for the production of optical fiber
07
OR
(c) A multimode step index fiber with a core diameter of 100 ?m and a
relative index difference of 1.5% is operating at a wavelength of 0.85
?m. If the core refractive index is 1.485, calculate: (i) Normalized
frequency of fiber (ii) Total number of guided modes.
07
Q.3 (a) Compare Direct band gape and Indirect band gape materials
03
(b) Explain structure of Edge double hetero junction LED
04
(c) Derive the equation for the power launched from LED Source in to a S.I.
fiber
07
OR
Q.3 (a) Compare LED and LASER diode as a light source in fiber optic
communication
03
(b) Explain structure of Surface LED
04
(c) Derive LASER rate equation
07
2
Q.4 (a) Define the following terms related to photo detector. (1) Responsivity (2)
Quantum efficiency (3) Cut off wavelength
03
(b) Discuss the fiber splicing techniques with necessary sketches.
04
(c) Explain Optical Time Domain Reflectometry (OTDR) method with its
benefits over other techniques
07
OR
Q.4 (a) Explain nature of light and its various polarization
03
(b) Explain principal of P i N photo detector with its energy band diagram
04
(c) Discuss the need of optical Amplifier and also describe the architecture
and amplification mechanism of Erbium Doped Fiber Amplifier. (EDFA)
07
Q.5 (a) Explain : Snell?s law.
03
(b) Discuss system features of WDM and explain WDM in brief also Draw
diagram of a typical WDM link containing various components
04
(c) Explain in detail : SONET/SDH
07
OR
Q.5 (a) Short note : Dispersion in fiber cable
03
(b) Explain the three key transient process involved in LASER action.
04
(c) Explain reach through avalanche photo diode structure with its electric
field and multiplication concept.
07
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This post was last modified on 20 February 2020