[wyager]

We already regularly run into optical nonlinearity issues in submarine cables. The instantaneous EM fields generated in high bandwidth fiber are sufficiently strong to cause nonlinear interactions with the fiber medium that we have to correct for.

[Salgat]

I don't believe this is a factor for the distances that inter-chip transmission has. From what I can find, this is at most an issue for communication spanning tens to hundreds of meters in a datacenter.