Download PTU M.Tech. ECE 1st Semester 75181 OPTICAL COMMUNICATION SYSTEM Question Paper

Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. ECE 1st Semester 75181 OPTICAL COMMUNICATION SYSTEM Question Paper.

1 | M-75181 (S35)-1918

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech. (ECE) (2018 Batch) (Sem.?1)
OPTICAL COMMUNICATION SYSTEM
Subject Code : MTEC-PE2Y-18-5
M.Code : 75181
Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

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
Q3 a) Distinguish between spontaneous and stimulated emission. Why indirect band gap
material is used for manufacturing 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
b) What is WDM and list the reasons for its development as a major communication
technology? 6
FirstRanker.com - FirstRanker's Choice

1 | M-75181 (S35)-1918

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech. (ECE) (2018 Batch) (Sem.?1)
OPTICAL COMMUNICATION SYSTEM
Subject Code : MTEC-PE2Y-18-5
M.Code : 75181
Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

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
Q3 a) Distinguish between spontaneous and stimulated emission. Why indirect band gap
material is used for manufacturing 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
b) What is WDM and list the reasons for its development as a major communication
technology? 6

2 | M-75181 (S35)-1918

Q6 Explain in detail :
a) Scattering 2
b) Numerical aperture measurement 4
c) Semiconductor and Erbium doped fiber amplifiers 6
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.
FirstRanker.com - FirstRanker's Choice