GTU Optical Communication - May 2016 Exam Question Paper

GTU Electronics and Communication Engineering (Semester 6)
Optical Communication
May 2016

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Briefly Explain the block diagram of Optical Communication Systems and also mention the advantages of optical fiber communication.

7 M

1 (b) With figure explain the plasma activated chemical vapor deposition (PCVD) technique for the production of optical fiber.

7 M

2 (a) Derive the equation for the power launched from LED Source in to a S.I. fiber.

7 M

Solve any one question from Q2(b) & Q2(c)

2 (b) A multimode step index fiber with a core diameter of 80 ?m and a relative index difference of 1.5% is operating at a wavelength of 0.85 ?m. If the core refractive index is 1.48, calculate:
(i) Normalized frequency of fiber
(ii) Total number of guided modes.

7 M

2 (c) (i) What is equilibrium numerical aperture? Give the significance of the same.

3 M

2 (c) (ii) A step index fiber has n_core=1.44 and n_clad=1.40 find
(1) The N.A.
(2) Delta
(3) The acceptance angle.

4 M

Solve any two question from Q3(a), Q3(b) & Q3(c), Q3(d)

3 (a) Discuss optical power loss model for a point to point link.

7 M

3 (b) What are bending losses in fiber optic communication? Describe:
(i) Micro bending losses.
(ii) Macro bending losses.

7 M

3 (c) List the types of Light Emitting Diodes used in optical system and explain any one of them with required figure.

7 M

3 (d) Discuss briefly the distributed feedback LASER with neat sketch.

7 M

Solve any two question from Q4(a), Q4(b) & Q4(c), Q4(d)

4 (a) Explain intramodal and intermodal dispersion in details

7 M

4 (b) Explain detection process in the p-i-n photodiode. Define the quantum efficiency & responsivity of a photo detector.

7 M

4 (c) A Silicon APD has a quantum efficiency of 75 % at a wavelength of 900 nm. If 0.5 mw of optical power produces a multiplied photo current of 10 mA, then what is avalanche gain for this device?

7 M

4 (d) (i) Give the comparison of S.I. and G.I. fibers.

4 M

4 (d) (ii) Give the comparison of S.M. and M. M. Fibers

3 M

Solve any two question from Q5(a), Q5(b) & Q5(c), Q5(d)

5 (a) Write short notes on Synchronous optical fiber networks (SONET).

7 M

5 (b) Explain the principle of operation of (i) EDFA (ii) Wavelength division multiplexing.

7 M

5 (c) What is optical coupler? Draw and explain optical coupler in detail.

7 M

5 (d) Draw and explain set ups for the measurements of the dispersion.

7 M

More question papers from Optical Communication

SPONSORED ADVERTISEMENTS