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EndsemNov 20232019 patternBE E&TC

Fiber Optic Communication (FOC) SPPU Endsem Question Paper Nov 2023

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
Nov 2023
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6181]-184

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

Instructions to the candidates

  1. Answer Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Assume suitable data if necessary.

Questions

  1. Q1

    1. a)

      When 3×10 11 photons each with a wavelength of 0.85  m are incident on a photo diode, on average. 1.2×10 11 electrons are collected at the terminals of the device. Determine the quantum efficiency and the responsivity of the photodiode at 0.85  m.

      Also asked:Nov 2025 ·May 2025

      [6]
    2. b)

      Explain the detection process in the p-n photodiode.

      [6]
    3. c)

      Define and explain the important performance and compatibility requirements for detectors.

      [6]

  2. Q2

    1. a)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]
    2. b)

      Enlist various noises in photodetector. Explain one of them in detail.

      [6]
    3. c)

      With the help of diagram explain working of APD. 2

      [6]

  3. Q3

    1. a)

      Let the data rate of 20Mb/s and BER of 10 –9 For the receiver PIN photodiode operating at 850 nm, the required receiver input signal is – 42dBm .The LED is used as a source can couple 50uW(–l3dBm) average optical power into a fiber flylead with a 50  m core diameter. Assume 1dB loss occurs when the fiber flylead is connected to the cable and another 1dB connector loss at the cable-photo detector interface. System margin of 6dB. Let attenuation per km is 3.5dB/km. Estimate link length.

      Also asked:Nov 2024

      [8]
    2. b)

      Draw and explain Fiber Bragg Grating.

      [6]
    3. c)

      Explain EDFA in detail.

      [4]

  4. Q4

    1. a)

      Explain Rise time budget. Give equation for the same.

      [6]
    2. b)

      A 2×2 biconical tapered fiber coupler has an input optical power level of P 0 = 200 mW. The output powers at the other three ports are P 1 = 90 mW, P 2 = 85 mW, and P 3 = 6.3 nW. What are the coupling ratio, excess loss, insertion losses, and return loss for this coupler?

      [8]
    3. c)

      With the help of diagram explain optical Isolator.

      [4]

  5. Q5

    1. a)

      Explain SONET structure in details.

      [5]
    2. b)

      Enlist and explain advantages and applications of SONET.

      Also asked:Nov 2024

      [6]
    3. c)

      With the help of diagram explain AON.

      [6]

  6. Q6

    1. a)

      Explain long haul networks.

      [7]
    2. b)

      Explain w.r.t. FDDI the following: i) FDDI model ii) Frame structure iii) Ring structure 3

      [10]

  7. Q7

    1. a)

      Enlist widely used optical system test instruments and explain their functions.

      Also asked:May 2023

      [6]
    2. b)

      Draw Schematic experimental setup for determining fiber attenuation by the cutback technique. Explain the same.

      Also asked:May 2023

      [6]
    3. c)

      Explain Dispersion measurement technique in detail.

      Also asked:Nov 2024

      [5]

  8. Q8

    1. a)

      Explain OTDR in detail.

      [6]
    2. b)

      Explain Eye diagram test. Define fundamental measurement parameters.

      Also asked:May 2023

      [6]
    3. c)

      With the help of diagram explain NA measurement technique. 

      [5]