STUPIDSID
1 (a)
list the disadvantages of coper wire at the optical frequency range.
6 M
1 (b)
Expalain the ray theroy of the fiber,with the help of neat sketch.
8 M
1 (c)
a silica galss fiber has a core refractive index of 1.5 and the elading refractive index of 1.45.calculate,br.critical angel for the core-cladding interface
the NA of the fiber and
the NA of the fiber and
6 M
2 (a)
Describe the attenuation mechanisms In an optical fiber
10 M
2 (b)
derive the equation for material dispersion in the optical fiber
6 M
2 (c)
An optical signal at a specific wavelength has lost 55% of its power,after traversing 7km of fiber.what is the attenuation in dB/km of this of this fiber
4 M
3 (a)
what are the characteristic requirements of an optical source?with the help of diagram.describe the operation of surface emitting LED.
10 M
3 (b)
which are the noise types affecting the optical detector
3 M
3 (c)
Describe the pin diode perfomance,using the diagram
7 M
4 (a)
Derive an equation for power coupling to the step index fiber and graded index fiber
10 M
4 (b)
what is equilibrium numerical aperture of a fiber?With the help of diagrams.expalin the lensing schemes for coupling improvement
10 M
5 (a)
Discuss the error sources in the optical signal detection
7 M
5 (b)
Derive an equation for optical receiver sensitivity.
10 M
5 (c)
Calculate the PIN diode receiver sensitivity,if the gain of the photo detector is 1.its noise figure is 1 and bandwidth of the receiver is assumed to be half of the bit rate.Note the BER is 10-12 and data rate is 100mb/s.
3 M
6 (a)
Write the diagram and explain the radio over fiber links
10 M
6 (b)
what is link power budget?with an example,explain the link power budget calculation
10 M
7 (a)
with the help of neat diagram,expalin the link power budget calculation
8 M
7 (b)
Describe the principles of working of isolators,circulator and ADM using suitable diagrams
12 M
8 (a)
What are the optical amplifires ?Describe with the help of a sketch the semiconductor laser amplifire
10 M
8 (b)
Describe the SONET optical network working with reference to suitable diagram.
10 M
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