单项选择题

What is the phenomenon called where different wavelengths of light travel at different speeds?（）

A.OSNR
B.dispersion
C.light skew
D.attenuation

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单项选择题
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.none
B.one
C.two
D.three
E.four
单项选择题
Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux (left side) composite output and the ONS 15216 Demux (right side) composite input, with the optical values given in the exhibit? （）(Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux Demux and ignore power penalties or extra margin.)

A.15dB
B.17dB
C.21dB
D.26dB
E.27dB
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