Download PTU B.Tech 2020 March ECE 7th and 8th Sem EC 404 Optical Fibre Communication Question Paper

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ECE (Electronics And Communications Engineering) 2020 March 7th and 8th Sem EC 404 Optical Fibre Communication Previous Question Paper

1 | M-57554 (S2)-2754
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ECE) (Sem.?7)
OPTICAL FIBRE COMMUNICATION
Subject Code : EC-404
M.Code : 57554
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Write briefly :
a. Dispersion
b. Numerical Aperture
c. Group velocity dispersion
d. What are skew Rays?
e. What do you mean by LED modulation bandwidth?
f. Relaxation oscillations
g. Self pulsation
h. Mode hopping
i. WDM
j. Avalanche photodiode.
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1 | M-57554 (S2)-2754
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ECE) (Sem.?7)
OPTICAL FIBRE COMMUNICATION
Subject Code : EC-404
M.Code : 57554
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Write briefly :
a. Dispersion
b. Numerical Aperture
c. Group velocity dispersion
d. What are skew Rays?
e. What do you mean by LED modulation bandwidth?
f. Relaxation oscillations
g. Self pulsation
h. Mode hopping
i. WDM
j. Avalanche photodiode.
2 | M-57554 (S2)-2754
SECTION-B
2. Draw and explain the refractive index profile and ray transmission in a multimode graded
index fiber.
3. What is the difference between a connector and a splice? When a connector used instead
of a splice?
4. Explain different losses of optical fiber.
5. Explain the working of PIN photodiode with suitable diagrams.
6. Draw and explain the optical fiber based communication system.

SECTION-C
7. a. Draw and explain the structure of p-n photo diode.
b. Compare the two simple techniques used for the measurement of numerical aperture
of optical fiber.
8. a. Explain with neat diagram working principle of injection LASER.
b. Briefly describe linear scattering losses in optical fiber with regard to:
i. Attenuation Coefficient
ii. Wave Guide imperfections
9. Write short note on following :
a. Optical TDM Systems
b. Code Division Multiplexing


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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