AKTU Solve Paper
Optical Fiber Communication
Year - 2019 - 20
Q47. The spectral response of an ideal
photo detector depicts its efficiency as a function of
Ans. Wavelength.
Q48. According to the frequency response of
the photo detector the modulation frequency at which the output current
decreases to ____________ of peak value
Ans. Half.
Q50. In an eye diagram digital signal with
very bad interface resembles the shape of
Ans. Straight line.
Q51. Which among the following parameter is
/ are decided by the front end of receiver?
Ans. A) sensitivity.
B) bandwidth.
C) both A and B.
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Q52. In an optical fibre the concept of
numerical aperture is applicable in describing the ability of_______
Ans.
Light collection.
Q53. Which among the following represents
the major to minimize the in-homogeneity for Mie scattering reduction?
Ans. A) extrusion control.
B) increase in relative refractive
index difference.
C) removal of imperfection due to
glass manufacturing process.
D) all of the above.
Q54. Which among the following is regarded
as an inelastic scattering of photon?
Ans. Raman effect.
Q55. Which among the following is a key
process adopted for the laser beam formation as it undergoes the light
amplification?
Ans. Stimulated emission.
Q56. For a photodiode with responsibility
of 0.50 A/w and optical power of about 12µW what should be the value of generated photocurrent
Ans. 6 micro amp.
Q57. Which feature of an eye diagram assist
in the measurement of additive noise in the signal
Ans. Eye opening (height,p2p)
Q58. Which method determines the dispersion
limitation of an optical link
Ans. Rise time budget.
Q59. Which kind of dispersion phenomena
give rise to pulse spreading in single mode fibers
Ans. Intramodal.
Q60. With respect to single mode and graded
index fibre which parameter specifies the propagation of polarization mode with
different phase velocities and the difference between their effective
refractive indices
Ans. Birefringence.
Q61. Which type of scattering occurs due to
interaction of light in a medium with time dependent optical density variations
thereby resulting into the change of energy and path
Ans. Stimulated brillouin scattering.
Q62. In an optical fiber communication
system, which among the following is not a typical transmitter function?
Ans. Recoding to match output standard
Q63. Which among the following is provided
by an optical receiver for the regeneration of data signal with minimum error?
Ans. Linear circuitry.
Q64. Which property/ies of PCM stream
determine/s the fidelity to original analogue signal?
Ans. A) sampling rate.
B) bit depth.
C) both A and B .
Q65. In single mode fiber, how does the
fraction of energy travelling through bound mode appear in the cladding
Ans. As an evanescent wave.
Q66. Attenuation is a loss that occurs
_____
Ans.
Q67. MFD defines light collecting ability
of ____fiber
Ans.
Q68. The path of skew rays in optical cable
is
Ans. Helical.
Q69. NA provides relation between
Ans.
Q70. For optical amplification in LED
___________ is responsible
Ans.
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