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单选题
The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（）
A
none
B
-600 ps/nm
C
-200 ps/nm
D
+200 ps/nm
E
+600 ps/nm
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If the dispersion of a given fiber is 17ps／nm*km at 1550 nm and zero at 1310 nm, then what is the accumulated dispersion of an ITU wavelength after it travels 200 km?()
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If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm， then what is the accumulated dispersion of an ITU wavelength after it travels 200 km？ （）A、 0 ps/nmB、 340 ps/nmC、 200 ps/nmD、 3400 ps/nmE、 More information is needed.
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Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? （）(Choose three.)A、PIN photodiodesB、zero-chirped lasersC、Erbium-doped fiber amplifiersD、dispersion compensating fiberE、dispersion compensating Bragg grating
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考题
The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm?（）A、noneB、-600 ps/nmC、-200 ps/nmD、+200 ps/nmE、+600 ps/nm
考题
A 2.5 Gb/s (OC-48 or STM-16) optical signal with a dispersion tolerance of 1200 ps/nm goes through fiber with 18ps/nm*km of dispersion. How many 15216-DCU-350 equivalents are needed for enough compensation after traveling 100 km?（）A、noneB、oneC、twoD、threeE、four
考题
单选题What is an advantage of an externally modulated laser over a directly modulated laser?（）A
lower costB
higher chirpC
easier to manufactureD
higher dispersion toleranceE
higher optical signal-to-noise ratio
考题
多选题What are three factors that limit the maximum distance of an amplified optical signal without regeneration？ （）Afiber dispersionBsignal attenuationCtransmitter powerDamplifier bandwidthEreceiver dispersion tolerance
考题
单选题If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm， then what is the accumulated dispersion of an ITU wavelength after it travels 200 km？ （）A
0 ps/nmB
340 ps/nmC
200 ps/nmD
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More information is needed.
考题
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noneB
oneC
twoD
threeE
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考题
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use oil dispersion agent and wait for investigationB
try to collect the oil on deck or in waterC
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B and C
考题
单选题The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm?（）A
noneB
-600 ps/nmC
-200 ps/nmD
+200 ps/nmE
+600 ps/nm
考题
多选题Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems？（）APIN photodiodesBzero-chirped lasersCErbium-doped fiber amplifiersDdispersion compensating fiberEdispersion compensating Bragg grating
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injection pressureB
shape of combustion spaceC
turbulence in combustion spaceD
all of the above
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