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Posted By: neyha Member Level: Diamond Posted Date: 27 May 2008
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2005 Anna University Electronics and Communication B.E./B.TECH.DEGREE EXAMINATION :OPTICAL COMMUNICATION Question paper
B.E./B.TECH.DEGREE EXAMINATION NOV/DEC 2005
VII -SEMESTER
OPTICAL COMMUNICATION
TIME :3 hrs
MAX MARKS :100
PART -A (10 X 2 = 20 MARKS)
1. A point sorce of ligth is 12 cm below the surface of a large body of water (n = 1.33). What is the radius of the largest circle on the water surface through which the light can emerge?
2. Consider a parabolic index waveguide with n1 =1.75 ,n2 = 1.677 and core radius 25 micro meter. Calculate the numerical aperture at the axis and at a point 20 micro meter from the axis
3. Write the expression for the effective number of modes guided by a curved multimode fiber of radius 'a'
4. Define normalized propagation constant.
5. Draw the three key transistion process involved in laser action
6. Write the concept of indirect bandgap semiconductor materials
7. Define responsivity of photodiode.
8. Define quantum efficiency of a photodetector
9. List the sysyem requirements neede in analyzing a point -to- point link
10. Write the concept of solition
PART - B (5 X 16 =80)
11(i) Diacuss the signal distortion in single mode fibers
(ii) Discuss pulse broadening in graded index fibers with necessary equations
12(a) (i) Briefly explain the evolution of fiber optic system
(ii) Compare the configuration of different types of fibers .
OR
(b)(i) Derive modal equation
(ii) Discuss the modes in step- index fibers
13(a) Draw the structures of edge-emitting LED and surface emitting LED and explain the operation
OR
(b) (i)Discuss the LASER diode principle , modes and threshold conditions
14(a) Draw the schematics of pin photodiode and APD and explain.
OR
(b) Explain the fundamental receiver operation in optical communication
15(a) Explain various types of fiber splicing techniques and fiber connectors
OR
(b) (i) Explain the operational principles of WDM
(ii) Explain the rise-time budget.
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