Anna University
Department of Electronics and Communication Engineering
Seventh Semester
EC2402 Optical Communication and Networking
Nov / Dec 2013 Important Questions
(Regulation 2008)
Unit 1
1. Derive Acceptance angle , Numerical aperture and Total internal reflection
2. Derive Linear Polarized Mode in optical fiber
3. Start from Maxwell equation drive Expression for wave equation
4. Distinguish b/w step index and graded index fibers
5. Derive mode equation for circular fiber
UNIT II
1.Explain with suitable diagrams the different mechanisms that contribute to attenuation in optical fibers.
2. Discuss in detail about Intramodal dispersion with relevant expression and diagrams.
3. Explain the different fiber splicing techniques with necessary diagrams.
4. Describe the intrinsic and extrinsic Rayleigh Scattering losses in fiber
5. What is meant by Material Dispersion? Derive the expression for the pulse broadening due to material Dispersion.
UNIT-III
1. Draw the three key transition process involved in laser action. What is meant by population inversion?
2. Draw the structures of edge-emitting LED and surface emitting LED and explain the operation
3. What is meant by indirect band gap semi conductor material? Give example for direct and indirect semiconductor materials
4. Discuss the LASER diode principle , modes and threshold conditions
5. A given APD has a quantum efficiency of 65 % at a wavelength of 90 nm . If 0.5 micro watt of optical power produces a multiplied photocurrent of 10 micro Ampere, find the multiplication
UNIT –IV
1 Explain the fundamental receiver operation in optical communication with neat block diagram
2 Explain the error sources of fundamental receiver operations.
3 Discuss the performance of digital receiver by defining the probability of error and Quantum Limit
4 Explain the different types of preamplifiers used in Fiber Optic Communication receiver with neat diagram.
5 Describe the Transimpedance amplifier used in an optical receiver and the benefits of a trans-impedance amplifier.
Unit V
1. Explain Architecture of SONET / SDH
2. Discuss the concept of Broadcast and select network
3. Explain Optical CDMA and Performance of WDM
4. Derive the Non linear effects on Network performance
5. Principle of Solitons and discuss the Parameter of Solitons with expression and diagram.
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