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GUJARAT TECHNOLOGICAL UNIVERSITY
SEMESTER-VI(NEW) - EXAMINATION - SUMMER 2019
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Subject Code:2161005 Date:21/05/2019
Subject Name:Optical Communication
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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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
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(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
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(c) A multimode step index fiber with a core diameter of 100 pm and a relative index difference of 1.5% is operating at a wavelength of ~ 0.85 pm. 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 gap and Indirect band gap 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
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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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Q.4 (a) Define the following terms related to photo detector. (1) Responsivity (2) Quantum efficiency (3) Cut off wavelength 03
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(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 1N photo detector with its energy band diagram 04
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(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
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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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