Why is it important to leave some residual dispersion at an amplifier site when 10Gb/s signals in a DWDM system have gone through a dispersion compensating device?
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A.
Reduces the effect of polarization mode dispersion
B.
Avoids gain tilt through the amplifier
C.
Compensating to zero dispersion has too much loss penalty
D.
Suppresses some non-linear effects like XPM and SPM
E.
None of the above