STUPIDSID
1(a)
What are fiber modes?
2 M
1(b)
Define numerical aperture of optical fiber.
2 M
1(c)
What are differences between a step index and graded index fiber?
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d)
An optical fiber has a NA of 0.2 and a cladding refractive index of 1.59. Determine the acceptance angle for the fiber in water which has a refractive index of 1.33.
7 M
1(e)
A glass fiber is made with core glass of refractive index 1.5 and the cladding is doped to give a fractional index difference of 0.0005. Find
i) Cladding refractive index i
i) Critical internal refection angle
iii) External critical acceptance angle.
iv) Numerical aperture
i) Cladding refractive index i
i) Critical internal refection angle
iii) External critical acceptance angle.
iv) Numerical aperture
7 M
2(a)
What do you understand by population inversion?
2 M
2(b)
What is LASER?
2 M
2(c)
What are optical connectors?
3 M
Solve any one question from Q.2(d) & Q.2(e)
2(d)
List the various characteristics of LED and explain the same in detail.
7 M
2(e)
Discuss various splicing techniques in optical fibers.
7 M
3(a)
What is chromatic dispersion?
2 M
3(b)
What are absorption losses in optical fibers?
2 M
3(c)
What are intramodal and intermodal dispersion?
3 M
Solve any one question from Q.3(d) & Q.3(e)
3(d)
The material dispersion in an optical fiber defined by \[\left | \dfrac{d^{2}n}{d\lambda^{2}} \right |is 4.0\times10^{-2}\mu m^{-2}\].Estimate the pulse broadening per kilometer due to material dispersion within the fiber when it is illuminated with an LED source with a peak wavelength of 0.9 μm and an rms spectral width 45 nm.
7 M
3(e)
Explain the scattering and the bending losses that occur in optical fiber with suitable diagrams.
7 M
4(a)
What is coherent detection?
2 M
4(b)
Explain the homodyne detection.
2 M
4(c)
Explain the heterodyne detection.
3 M
Solve any one question from Q.4(d) & Q.4(e)
4(d)
Discuss the link power budget and rise time budget in detail.
7 M
4(e)
Explain Eye patterns in detail.
7 M
5(a)
What are isolators?
2 M
5(b)
What are circulators?
2 M
5(c)
What are optical amplifiers?
3 M
Solve any one question from Q.5(d) & Q.5(e)
5(d)
Discuss the concept of wavelength division multiplexing
7 M
5(e)
Discuss EDFA in detail.
7 M
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