We already have transceivers that perform forward error correction. That technology is a decade+ old.
Dispersion compensation and FEC are separate layers of the cake, and work hand in hand.
I don’t understand why, tho I do not have any kind of expertise here.
I suggest (Haven’t read it), this paper proposes to send much denser and broadened signals around one carrier frequency (they use single mode). Due to dispersion they
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Start to overlap with one each other. If you put more frequencies, you would have more overlaps and I fail to see how it won’t lead to errors.
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They all arrive at the broader time window, which again could be mitigated either by error correction, or by extending the time window.