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

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Roll No. [T | Total No. of Pages : 02

Total No. of Questions : 09

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B.Tech. (ECE) (Sem.-7)

OPTICAL FIBRE COMMUNICATION

Subject Code : EC-404

M.Code : 57554

Time : 3 Hrs. Max. Marks : 60

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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

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1. Write briefly :
   1. Dispersion
   2. Numerical Aperture
   3. Group velocity dispersion
   4. What are skew Rays?
   5. What do you mean by LED modulation bandwidth?

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   6. Relaxation oscillations
   7. Self pulsation
   8. Mode hopping
   9. WDM
   10. Avalanche photodiode.

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SECTION-B

1. Draw and explain the refractive index profile and ray transmission in a multimode graded index fiber.
2. What is the difference between a connector and a splice? When is a connector used instead of a splice?
3. Explain different losses of optical fiber.

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4. Explain the working of PIN photodiode with suitable diagrams.
5. Draw and explain the optical fiber based communication system.

SECTION-C

1. 1. Draw and explain the structure of p-n photo diode.
   2. Compare the two simple techniques used for the measurement of numerical aperture of optical fiber.

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2. 1. Explain with neat diagram working principle of injection LASER.
   2. Briefly describe linear scattering losses in optical fiber with regard to:
      1. Attenuation Coefficient
      2. Wave Guide imperfections

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3. Write short note on following :
   1. Optical TDM Systems
   2. 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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