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EndsemMay 20242019 patternBE E&TC

Fiber Optic Communication (FOC) SPPU Endsem Question Paper May 2024

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated FOC questions
Subject code
404190
Pattern
2019 pattern
Exam
Endsem
Session
May 2024
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6263]-137

Printed for: B.E. (E & TC)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Figures to the right indicate full marks.
  3. Assume the suitable data, if necessary.
  4. Neat diagrams must be drawn wherever necessary.

Questions

  1. Q1

    1. a)

      Explain the following parameters associated with the photo detectors: quantum efficiency, responsivity, long cutoff wavelength. For a Si photodetector calculate the long cutoff wavelength.

      [8]
    2. b)

      State and explain the requirements from photo detectors.Draw and explain the working of a photo transistor.

      [10]

  2. Q2

    1. a)

      Explain the following parameters associated with the photo detectors: thermal noise, dark current noise, quantum noise and receiver sensitivity.

      [8]
    2. b)

      Describe with the aid of suitable diagrams the avalanche photo diode (APD). Compare between the photodiodes: p-n and p-i-n photo detectors. Comment on their usefulness from link design perspective.

      [10]

  3. Q3

    1. a)

      Explain the concept of wavelength division multiplexing (WDM) technique. Draw the block diagram of a WDM system and explain the function of each block.

      [8]
    2. b)

      Write the optical power budget equation for a point-to-point link. A 40 km Fast Ethernet single mode link with 0.4 dB/km loss, at 1310 nm is used with two connector pairs and 5 splices between a transmitter of - 8 dBm power and receiver with a sensitivity of - 38 dBm. Given: one Connector pair loss =0.75 dB& Per splice loss = 0.1dB. calculate: i) Total connector loss and total splice loss ii) Total link loss considering a safety margin of 6 dB. iii) Estimate the maximum total fiber distance for the fiber optic link. 2

      [9]

  4. Q4

    1. a)

      Explain with neat block diagram. i) Link power budget ii) Rise time budget

      [8]
    2. b)

      State the various types of amplifiers used in lightwave systems amplifiers. Compare between SOA and EDFA type of amplifiers.

      [9]

  5. Q5

    1. a)

      Define Optical Network. Explain the term optical node & light path with a suitable diagram relative to optical network. Define network topology. State and explain types of network topologies with suitable diagram.

      Also asked:May 2025 ·Nov 2024

      [9]
    2. b)

      With suitable diagrams, explain the concept of FTTH and FTTP. State advantages of FTTH and FTTP.

      [9]

  6. Q6

    1. a)

      What is FTTX. What are the different categories of FTTX? Explain FTTX with respect to architecture, advantages. Compare the categories.

      Also asked:May 2025 ·Nov 2024

      [9]
    2. b)

      With suitable diagrams explain terrestrial and Submarine optical networks.

      [9]

  7. Q7

    1. a)

      Explain the various methods used to measure the fiber attenuation. Compare and comment on the accuracy of each of the methods.

      [8]
    2. b)

      Draw and explain with a block diagram the working of an OTDR. Draw the trace of an OTDR and explain the various events observed on the display of an OTDR.

      [9]

  8. Q8

    1. a)

      State and explain the need of a BER tester. Explain the concept of eye diagram and the various parameters that can be measured from the eye diagram.

      [8]
    2. b)

      Explain the following instruments used for the testing and measurement purpose in optical fiber networks: - visual fault indicator - optical power meter - OSA 

      [9]