Practical pulse broadening value for graded index fiber lies in the range of . . . . . . . .
A. 0.9 to 1.2 ns/km
B. 0.2 to 1 ns/km
C. 0.23 to 5 ns/km
D. 0.45 to 8 ns/km
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The nonlinear effects in optical fibers are large.
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Mie scattering has in-homogeneities mainly in . . . . . . . .
A. Forward direction
B. Backward direction
C. All direction
D. Core-cladding interface
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What is refraction?
A. Bending of light waves
B. Reflection of light waves
C. Diffusion of light waves
D. Refraction of light waves
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How many propagation modes are present in single mode fibers?
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Self-phase modulation causes modifications to the pulse spectrum.
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Rayleigh scattering and Mie scattering are the types of . . . . . . . .
A. Linear scattering losses
B. Non-linear scattering losses
C. Fiber bends losses
D. Splicing losses
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Nonlinear effects which are defined by the intensity - dependent refractive index of the fiber are called as . . . . . . . .
A. Scattering effects
B. Kerr effects
C. Raman effects
D. Tomlinson effects
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Which is the most important velocity in the study of transmission characteristics of optical fiber?
A. Phase velocity
B. Group velocity
C. Normalized velocity
D. Average velocity
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Most of the power in an optical fiber is transmitted in fiber cladding.
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When the input and output power in an optical fiber is 120μW & 3μW respectively and the length of the fiber is 8 km. What is the signal attenuation per km for the fiber?
A. 3dB/km
B. 2dB/km
C. 1dB/km
D. 4dB/km
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What is the unit of normalized frequency?
A. Hertz
B. Meter/sec
C. Coulombs
D. It is a dimensionless quantity
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What does ISI stand for in optical fiber communication?
A. Invisible size interference
B. Infrared size interference
C. Inter-symbol interference
D. Inter-shape interference
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Which law gives the relationship between refractive index of the dielectric?
A. Law of reflection
B. Law of refraction (Snell's Law)
C. Millman's Law
D. Huygen's Law
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The variant of non-zero-dispersion-shifted fiber is called as . . . . . . . .
A. Dispersion flattened fiber
B. Zero-dispersion fiber
C. Positive-dispersion fiber
D. Negative-dispersion fiber
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. . . . . . . . zsemiconductor laser sources generally have broader bandwidths.
A. Injection
B. Pulsed
C. Solid-state
D. Silicon hybrid
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Which of the following statements best explain the concept of material absorption?
A. A loss mechanism related to the material composition and fabrication of fiber
B. A transmission loss for optical fibers
C. Results in attenuation of transmitted light
D. Causes of transfer of optical power
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How many mechanisms are there which causes absorption?
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In the given equation, state what αr suggests?
A. Radius of curvature
B. Refractive index difference
C. Radiation attenuation coefficients
D. Constant of proportionality
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For no overlapping of light pulses down on an optical fiber link, the digital bit rate BT must be . . . . . . . .
A. Less than the reciprocal of broadened pulse duration
B. More than the reciprocal of broadened pulse duration
C. Same as that of than the reciprocal of broadened pulse duration
D. Negligible
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