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Roll No.
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Total No. of Questions : 08
Total No. of Pages : 02
M.Tech. (ECE) (2018 Batch) (Sem.-1)
OPTICAL COMMUNICATION SYSTEM
Subject Code : MTEC-PE2Y-18-5
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M.Code: 75181
Time: 3 Hrs.
Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
- Attempt any FIVE questions out of EIGHT questions.
- Each question carries TWELVE marks.
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Q1 a) Explain acceptance angle, critical angle and attenuation in optical fibre. 6
b) List all the basic components of a fiber optic cable and explain their functions. 6
Q2 a) Differentiate between step-index and graded index fiber. Explain mode field diameter (MFD) of a single mode fiber. 6
b) Explain the outside vapour phase oxidation fiber fabrication method. 6
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Q3 a) Distinguish between spontaneous and stimulated emission. Why indirect band gap material is used for manufacing LED's? 6
b) Draw the energy band diagram of LED diode. 6
Q4 a) What are the different types of noises present in the photodetector? Also, derive the expression for signal-to-noise ratio at the output of an optical receiver. 8
b) Explain the power-current characteristic of LED. 4
Q5 a) Explain fusion and mechanical splicing techniques used in optical fiber splicing. 6
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b) What is WDM and list the reasons for its development as a major communication technology? 6
Q6 Explain in detail :
a) Scattering 2
b) Numerical aperture measurement 4
c) Semiconductor and Erbium doped fiber amplifiers 6
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Q7 a) Explain optical OFDM. Why OFDM is needed to be in conjunction with optical communication? 6
b) Explain the classification of a photo-detector based on intrinsic and extrinsic process. 6
Q8 a) Explain the problems associated with the optical OFDM. 6
b) Explain peak-to-average power ratio and the methods to minimize it. 6
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU M.Tech 1st Semester Last 10 Years 2010-2020 Previous Question Papers|| Punjab Technical University
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