hi all,
as far dispersion compensation is concerned we can do that in three sections of communication link
1. transmitter(called pre-distortion compensation)
2. inline(in the channel)
3. tranmitter(post-compensation)
for chirping signal we have two method for dispersion compensation.
1. pre-chirp(at the modulator)
2. nonlinear chirp gennerally using SOA
Chirping can be -positive, indicates the pulse is blue shifted meaning that higher frequencies are in the falling edge, and negative, indicates the pulse is red shifted meaning that lower frequencies are in the falling edge.
with regards