PAM4 Link with MZM
I am trying to simulate a MZM based PAM4 link. I have two issues as following,
1. As you can see in the attached figure, the PAM4 signal after modulation is unequally spaced due to nonlinearity in MZM transfer curve, is it possible to pre-distort the PAM4 pulse and make the modulated signal equally spaced?
2. There is an electronic equalizer module which helps in electronic dispersion compensation. Can this equalizer module work for multi-level signal, i.e., PAM4? It looks like the module can only accept binary sequence as reference, which prevents it to be used in multi-level signal.
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