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
B.340
C.200
D.3400
E.More
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开始登机（ ）A.start getting on the planeB.start getting in the planeC.BoardingD.start climbing on the plane
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A2.5Gb／s（OC－48orSTM－16）opticalsignalwithadispersiontoleranceof1200ps／nmgoesthroughfiberwith18ps／nm*kmofdispersion.Howmany15216－DCU－350equivalentsareneededforenoughcompensationaftertraveling100km？（）
A.none
B.one
C.two
D.three
E.four
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