Question Paper: Optical Fibre Communication Question Paper - May 17 - Electronics Engineering (Semester 7) - Mumbai University (MU)
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## Optical Fibre Communication - May 17

### Electronics Engineering (Semester 7)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

Q1) Answer the following questions (any four)

1(a) Draw the refractive index profile with dimensions of different types of fiber.
(5 marks) 1208

1(b) Explain linearity polarized modes.
(5 marks) 00

1(c) Describe the eye diagrams as applicable to optical fiber communication.
(5 marks) 1219

1(d) With the help of neat sketch, explain the working of optical isolator.
(5 marks) 1244

1(e) Distinguish spontaneous and stimulated emission.
(5 marks) 1224

1(f) What is Optical Transport Network (OTN)?
(5 marks) 00

2(a) Compare step index fiber and graded index fiber.; Derive the expression for Numerical Aperture of a step index fiber. What will happen to Numerical Aperture if cladding removed?
(10 marks) 1209

2(b) Find core radius necessary for single mode operation at 820nm of step index fiber with n 1 = 1.482 and n 2 = 1474. What is the numerical aperture and maximum acceptance angle of this fiber? Calculate the corresponding solid angle.
(10 marks) 1205

3(a) Explain with neat sketch the two categories of front end amplifiers, Discuss the possible sources of noise in optical fiber receiver.
(10 marks) 1241

3(b) What do you understand by intermodal dispersion? Derive the expression for material dispersion. Explain with neat diagram. Explain how to minimize micro bending losses.
(5 marks) 1248

4(a) Compare coherent and non-coherent detection. Explain the bit error rate of optical receiver and receiver performance.
(10 marks) 1238

4(b) Generic configuration of typical SONET or SOH Network. What are the Network Categories? Give the names of public Network established.
(10 marks) 1291

5(a) Explain OTDR with neat sketch and mention is advantages and applications.
(10 marks) 1251

5(b) Explain with components typical WDM link in detail & Give the details of network management in a typical optical network.
(10 marks) 1288

Q6) Write short note on (any 4):

6(a) Mode coupling.
(5 marks) 00

6(b) State difference between LED and LASER.
(5 marks) 1227