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Optical Communication And Networks - May 17
Electronics And Telecomm (Semester 7)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question No. 1 is compulsory.
(2) Attempt any three from remaining five questions.
(3) Figures to the right indicated full marks.
Q1(a) Compare Intramodal Dispersion and Intermodal Dispersion.
(5 marks)
944
Q1(b) Define Critical Angle, Acceptance Angle, Fresnel Reflection and External Reflection.
(5 marks)
920
925
Q1(c) Compare LED and LASER Sources.
(5 marks)
955
Q1(d) Differentiate DWDM and WDM Techniques.
(5 marks)
970
Q2(a) Explain OTDR working principle in detail.
(10 marks)
948
Q2(b) Derive an expression for Time Delay in Intermodal Dispersion.
(5 marks)
00
Q2(c) Calculate the number of modes at 1.3$\mu$m wavelength in GIF having index profile $\alpha$=2, core radius 25$\mu$m, core refractive index 1.48 and cladding refractive index 1.46.
(5 marks)
927
Q3(a) Sketch the Refractive Index Profile of SIF and GIF. Derive an expression for Numerical Aperture and Number of Modes in SIF.
(10 marks)
930
932
Q3(b) Explain any one Fiber Fabrication Technique.
(5 marks)
935
Q3(c) Compare Isolators and Circulators.
(5 marks)
972
Q4(a) Derive an expression for Link Power Budget Analysis of optical fiber.
(7 marks)
962
Q4(b) Derive an expression for Responsivity of PIN photodiode. Differentiate PIN and RAPD photodiodes.
(8 marks)
957
Q4(c) Explain Front End Amplifiers in optical communication.
(5 marks)
961
Q5(a) Explain OTDM in detail.
(10 marks)
974
Q5(b) Describe SONET/SDH in detail.
(10 marks)
970
Q6) Write short note on any two:-
(20 marks)
- a) Crosstalk
b) Dispersion 942
c) Optical Safety 982
d) Fault Management
980
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