11-06-2013, 12:14 PM
SEMESTER EXAMINATIONS FOR OPTICAL COMMUNICATIONS TECHNOLOGY
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Answer any five questions
All questions carry equal marks
1.a) Discuss the various parameters that effect the signal propagation in optical fibers with respect to wave theory approach.
b) What are solitons? Explain the pulse propagation in solitons.
2.a) Why do second order non linearities typically not affect a light wave system?
b) Give an account on stimulated Raman Scattering.
3.a) Show that the extinction ration penalty in amplified systems limited by signal spontaneous beat noise and spontaneous-spontaneous beat noise that other noise terms are negligible and standard notations.
b) Explain various cross talk reduction methods in optical switches.
4.a) Sketch the three port and four port circulators and discuss the principle of operation of Circulators and isolators?
b) What is the use of Mach-Zehnder Interferometer (MZI)? Explain its principle of operation with neat diagram.
5.a) Give an account on Wavelength stabilization against temperature variations.
b) Explain in detail Direct and Extend modulation Transmitters.
6.a) Discuss the Acoustic-Optic Tunable Filter(AOTF) as a Router and explain its principle of operation.
b) Give an account on Erbium- Doped Fiber Amplifiers with neat Diagram.
7.a) What is modulation and demodulation? Discuss the signal forms and formats for modulation in receiver.
b) Show that Bit Error Rate ()21neGPBERQGPB and plot the receiver sensitivity as a function of bit rate for different receivers. Assume standard notations.
8.a) Discuss the Broadcast and select single HOP and multi HOP Networks.
b) Explain Time Domain Intermodal Dispersion methods.