单项选择题

Click the Exhibit button. Which type of multiplexer is shown in the exhibit?（）

A. Thin Film filter
B. Fiber Bragg Grating
C. Arrayed Wave Guide
D. Erbium fiber amplifier

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单项选择题
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
单项选择题
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/nm
B.340 ps/nm
C.200 ps/nm
D.3400 ps/nm
E.More information is needed.
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