STUPIDSID
1(a)
Discuss the basic block diagram of optical communication system.
5 M
1(b)
Draw the refractive index profile for the step index and graded index fiber. For each type give typical core and cladding diameters.
5 M
1(c)
Differentiate between spontaneous and stimulated emissions.
5 M
1(d)
Derive expression for the responsivity of an intrinsic photodetector in terms of quantum efficiency and wavelength.
5 M
2(a)
Draw refractive index profile of a graded index fiber and show with neat diagram transmission of light through this fiber. Explain how GRIN fiber has transmission bit rate much higher than multimode step index fiber.
10 M
2(b)
Find the core radius necessary for single mode operation at 820nm of step index fiber with n1 = 1.482 and n2 = 1.474. What is the numerical aperture and maximum acceptance angle of this fiber ? Calculate the corresponding solid angle.
10 M
3(a)
List the important factors responsible for power loss in optical fiber. Explain each factor briefly.
10 M
3(b)
Explain intermodal and intermodal dispersion. How does dispersion affect the transmission bandwidth of optical fibers.
10 M
4(a)
What is the basic principle on which optical sources work ? With the help of a LED structure explain its working.
10 M
4(b)
Draw the structure of Avalanche Photo Diode (APD) along with the electric field profile that exist in the various regions of APD structure. Explain the working.
10 M
5(a)
Explain modified chemical vapour deposition (MCVD) method of fiber fabrication in detail.
10 M
5(b)
Discuss a popular non-destructive technique for attenuation measurement.
10 M
6(a)
Describe two methods of splicing individual fibers together. What are the advantages and disadvantages of each method ?
10 M
6(b)
What are the desirable requirements of a good fiber optic connector ? What are the lensing schemes for coupling environments ?
10 M
Write short notes on any two:
7(a)
OTDR
10 M
7(b)
Link Power Budget
10 M
7(c)
Coherent and Noncoherent optical transmission.
10 M
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