Deck 6: Fiber Optics Fabrication Techniques and Phenomena
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Deck 6: Fiber Optics Fabrication Techniques and Phenomena
1
Self-phase modulation can be used for
A)enhancing the core diameter
B)wavelength shifting
C)decreasing the attenuation
D)reducing the losses in the fiber
A)enhancing the core diameter
B)wavelength shifting
C)decreasing the attenuation
D)reducing the losses in the fiber
wavelength shifting
2
The beating between light at different frequencies or wavelengths in multichannel fiber transmission causes
A)attenuation
B)amplitude modulation of channels
C)phase modulation of channels
D)loss in transmission
A)attenuation
B)amplitude modulation of channels
C)phase modulation of channels
D)loss in transmission
phase modulation of channels
3
What is different in case of cross-phase modulation from self-phase modulation?
A)overlapping but same pulses
B)overlapping but distinguishable pulses
C)non-overlapping and same pulses
D)non-overlapping but distinguishable pulses
A)overlapping but same pulses
B)overlapping but distinguishable pulses
C)non-overlapping and same pulses
D)non-overlapping but distinguishable pulses
overlapping but distinguishable pulses
4
When three wave components co-propagate at angular frequency w1, w2, w3, then a new wave is generated at frequency w4, which is given by
A)w4 = w1-w2-w3
B)w4 =w1+w2+w3
C)w4 =w1+w2-w3
D)w4 =w1-w2+w3
A)w4 = w1-w2-w3
B)w4 =w1+w2+w3
C)w4 =w1+w2-w3
D)w4 =w1-w2+w3
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5
_____________ results from case of nonlinear dispersion compensation in which the nonlinear dispersion compensation in which the nonlinear dispersion compensation in which the nonlinear chirp caused by self-phase modulation balances, postpones, the temporal broadening induced by group velocity delay.
A)four wave mixing
B)phase modulation
C)soliton propagation
D)raman scattering
A)four wave mixing
B)phase modulation
C)soliton propagation
D)raman scattering
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6
What is a fundamental necessity in the fabrication of fibers for light transmission?
A)same refractive index for both core and cladding.
B)pump source
C)material composition of fiber
D)variation of refractive index inside the optical fiber
A)same refractive index for both core and cladding.
B)pump source
C)material composition of fiber
D)variation of refractive index inside the optical fiber
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7
Which materials are unsuitable for the fabrication of graded index fiber?
A)glass-like-materials
B)mono-crystalline structures
C)amorphous material
D)silica based material
A)glass-like-materials
B)mono-crystalline structures
C)amorphous material
D)silica based material
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8
How many different categories are available for the methods of preparing optical glasses?
A)1
B)2
C)3
D)4
A)1
B)2
C)3
D)4
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9
What is the first stage in liquid-phase-technique?
A)preparation of ultra-pure material powders
B)melting of materials
C)decomposition
D)crystallization
A)preparation of ultra-pure material powders
B)melting of materials
C)decomposition
D)crystallization
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10
Which processes are involved in the purification stage in liquid-phase-technique?
A)filtration, co-precipitation, re-crystallization
B)decomposition, filtration, drying
C)doping, drying, decomposition
D)filtration, drying, doping
A)filtration, co-precipitation, re-crystallization
B)decomposition, filtration, drying
C)doping, drying, decomposition
D)filtration, drying, doping
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11
At what temperature range, does the melting of multi components glass systems takes place?
A)100-300 degree celsius
B)600-800 degree celsius
C)900-1300 degree celsius
D)1500-1800 degree celsius
A)100-300 degree celsius
B)600-800 degree celsius
C)900-1300 degree celsius
D)1500-1800 degree celsius
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12
Fiber drawing using preform was useful for the production of graded index fibers.
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13
The minute perturbations and impurities in the fiber drawing process using preform technique can result in very high losses of
A)between 500 and 1000 db/km
B)between 100 and 300 db/km
C)between 1200 and 1600 db/km
D)more than 2000 db/km
A)between 500 and 1000 db/km
B)between 100 and 300 db/km
C)between 1200 and 1600 db/km
D)more than 2000 db/km
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14
The liquid-phase melting technique is used for the production of fibers
A)with a core diameter of 50?m.
B)with a core diameter less than 100?m.
C)with a core diameter more than 200?m.
D)with a core diameter of 100?m.
A)with a core diameter of 50?m.
B)with a core diameter less than 100?m.
C)with a core diameter more than 200?m.
D)with a core diameter of 100?m.
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15
Graded index fibers produced by liquid-phase melting technique are less dispersive than step-index fibers.
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16
Which of the following is not a technique for fabrication of glass fibers?
A)vapor phase oxidation method
B)direct melt method
C)lave ring method
D)chemical vapor deposition technique
A)vapor phase oxidation method
B)direct melt method
C)lave ring method
D)chemical vapor deposition technique
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17
_____________ technique is method of preparing extremely pure optical glasses.
A)liquid phase (melting)
B)radio frequency induction
C)optical attenuation
D)vapor phase deposition (vpd)
A)liquid phase (melting)
B)radio frequency induction
C)optical attenuation
D)vapor phase deposition (vpd)
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18
Which of the following materials is not used as a starting material in vapor-phase deposition technique?
A)sicl4
B)gecl4
C)o2
D)b2o3
A)sicl4
B)gecl4
C)o2
D)b2o3
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19
P2O5 is used as a _____________
A)dopant
B)starting material
C)cladding glass
D)core glass
A)dopant
B)starting material
C)cladding glass
D)core glass
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20
How many types of vapor-phase deposition techniques are present?
A)one
B)two
C)three
D)four
A)one
B)two
C)three
D)four
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21
___________ uses flame hydrolysis stems from work on soot processes which were used to prepare the fiber with losses below 20 dB/km.
A)outside vapor phase oxidation
B)chemical vapor deposition
C)liquid phase melting
D)crystallization
A)outside vapor phase oxidation
B)chemical vapor deposition
C)liquid phase melting
D)crystallization
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22
Complete the given reaction
A)2hcl
B)4hcl
C)2cl2
D)4cl2
A)2hcl
B)4hcl
C)2cl2
D)4cl2
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23
In modified chemical vapor deposition, vapor phase reactant such as _________ pass through a hot zone.
A)halide and oxygen
B)halide and hydrogen
C)halide and silica
D)hydroxides and oxygen
A)halide and oxygen
B)halide and hydrogen
C)halide and silica
D)hydroxides and oxygen
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24
_________ is the stimulation of oxide formation by means of non-isothermal plasma maintained at low pressure in a microwave cavity surrounding the tube.
A)outside vapor phase oxidation (ovpo)
B)vapor axial deposition (vad)
C)modified chemical vapor deposition (mcvd)
D)plasma-activated chemical vapor deposition (pcvd)
A)outside vapor phase oxidation (ovpo)
B)vapor axial deposition (vad)
C)modified chemical vapor deposition (mcvd)
D)plasma-activated chemical vapor deposition (pcvd)
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25
Only graded index fibers are made with the help of vapor-phase deposition techniques. State whether true or false.
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