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单选题
Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）
A
They are both regions of lowest loss.
B
They are both regions of low reflections.
C
They are both regions of low index of refraction.
D
They are both regions of low chromatic dispersion.
E
They are both regions of low Polarization Mode Dispersion (PMD).
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更多 “单选题Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）A They are both regions of lowest loss.B They are both regions of low reflections.C They are both regions of low index of refraction.D They are both regions of low chromatic dispersion.E They are both regions of low Polarization Mode Dispersion (PMD).” 相关考题
考题
EPON数据业务下行波长、CATV业务下行波长、ONU上行波长分别是()。
A.1490nm、1550nm、1310nmB.1310nm、1490nm、1550nmC.1550nm、1490nm、1310nmD.1550nm、1310nm、1490nm
考题
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.3400 ps/nmE.More information is needed.
考题
Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?()
A. They are both regions of lowest loss.B. They are both regions of low reflections.C. They are both regions of low index of refraction.D. They are both regions of low chromatic dispersion.E. They are both regions of low Polarization Mode Dispersion (PMD).
考题
光纤通信选用的波长范围在800～1800nm，并称800～900nm为短波长波段，主要用850nm一个窗口。1300～1600nm为长波长波段，主要有（ ）两个窗口。A.1300nm和1540nm
B.1310nm和1550nm
C.1320nm和1560nm
D.1330nm和1570nm
考题
光纤通信选用的波长范围在800～1800hm，并称800～900nm为短波长波段，主要用850nm一个窗口。1300～1600nm为长波长波段，主要有()两个窗口。A.1300nm和1540nm
B.1310nm和1550nm
C.1320nm和1560nm
D.1330hm和1570nm
考题
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、 3400 ps/nmE、 More information is needed.
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
Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）A、They are both regions of lowest loss.B、They are both regions of low reflections.C、They are both regions of low index of refraction.D、They are both regions of low chromatic dispersion.E、They are both regions of low Polarization Mode Dispersion (PMD).
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
3400 ps/nmE
More information is needed.
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
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
3400 ps/nmE
More information is needed.
考题
单选题EPON数据业务下行波长、CATV业务下行波长、ONU上行波长分别是（）。A
1490nm、1550nm、1310nmB
1310nm、1490nm、1550nmC
1550nm、1490nm、1310nmD
1550nm、1310nm、1490nm
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
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