STUPIDSID
1 (a)
Explain three operating windows in optical communication.
5 M
1 (b)
State the difference between the dispersion shifted and dispersion compensated fiber.
5 M
1 (c)
Compare direct band gap and indirect band gap semiconductors.
5 M
1 (d)
Derive expression for responsivity of an intrinsic photo detector in terms of quantum efficiency wavelength.
5 M
2 (a)
A graded index fiber has a core diameter of 45μ m. Core has a parabolic refractive index profile. The fiber has NA of 0.22 and operating at wavelength of 1.2 μm. Estimate total number of guided mode propagating in the fiber.
10 M
2 (b)
Explain any one fiber fabrication process with a neat diagram. Compare the different methods of fabrication.
10 M
3 (a)
Explain all aspect of link power budget and rise time budget.
10 M
3 (b)
What are the factors that are responsible for optical signal attenuation and dispersion during signal propagation through optical fiber.
10 M
4 (a)
A silica optical fiber with core diameter large enough to be considered by Ray theory has a core refractive index of 1.5 and cladding refractive index 1.47.
Determine
ii) The NA
iii) The Acceptance angle.
Determine
ii) The NA
iii) The Acceptance angle.
10 M
4 (b)
With the help of device structure explain the working of LED and LASER with the emphasis on spontaneous and stimulated emission.
10 M
5 (a)
Describe the various methods of splicing individual fibers together. Enlist the desirable requirements of good fiber conductor.
10 M
5 (b)
State the working principle of Raman amplifier and state its applications.
10 M
6 (a)
Explain basic principle of operation of photo detector. Explain the working of PIN diode and APD as photo detector, also compare their performance.
10 M
6 (b)
Draw and explain block diagram of optical receiver along with various noise sources and relevant equations.
10 M
Write short notes on any four:
7 (a)
Optical bandwidth and Electrical bandwidth
5 M
7 (b)
Coherent and Non coherent optical communicator.
5 M
7 (c)
OTDR
5 M
7 (d)
Multiplexing of optical signals
5 M
7 (e)
Linearly polarized modes
5 M
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