Pondicherry University 2009 B.Tech Electronics and Communications Engineering Microwave and optical engineering - Question Paper
ET 371 R
B.Tech. DEGREE EXAMINATION, NOVEMBER 2009. Seventh Semester ECE
MICROWAVE AND OPTICAL ENGINEERING
(For'2003 batches)
Time : Three hours Maximum : 75 marks
Answer FIVE questions, by choosing ONE full question from each unit.
All questions carry equal marks.
UNIT I
/ i. (a) Describe the process of bunching and velocity I modulation of reflex klystron. (8)
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(b) Explain mode patterns of reflex klystron. (7)
Or
2. (a) What is the various modes of operation of bipolar transistor? Explain briefly.
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(b) Draw the types of im|att diodes with dropping profiles. Derive the negative resistance, output power
and efficiency from small signal toodel. (8)
UNIT II
3. (a) Write the relation between S and ABCD parameters. Explain unitary property of scattering parameters. (?)
(b) Two transmission lines of zl and z2 are joined at plane pp'. Express as parameters in terms of
impedance. (8).
Or
4. (a) Explain a two port network. (8)
(b) Write about various losses in microwave
devices in terms of S parameters when ports are
matched terminated. (7)
UNIT III ,
5. (a) Write about attenuation losses. (8) (b) Derive expression for group delay. (7)
Or
6. (a) Explain radiation losses. (7) (b) Write about
(i) Modal noise
(ii) Model partition noise
(iii) Reflection noise (8)
7. (a) Draw and explain various structures of laser diode. (8)
(b) Draw and explain various current confinement methods. (7)
Or
8. , (a) What is the requirements of photodetectors? Write about various characteristics of photo diode. (7)
(b) Kvplain about fundamental receiver configuration. (8)
UNITV
9. (a) Write briefly about the concept of SONET. (7)
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(b) Explain the power budget analysis of optical systems. (8)
Or
10. (a) Write short notes on Active Optical Network (AON). (8)
(b) Write short notes on Passive Optical Network. (PON). (7)
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