Keep in mind that -3dB modulator bandwidth is never the full picture - judicious driver and DSP design can compensate modulator shortfall to an extent esp. if you're Intel, Marvell, Broadcom, etc. If the transmitter meets OMA, ER, TDECQ specs you're good to go. Standard (direct-detect) optical interfaces at this channel rate are still PAM4 (see IEEE P802.3dj); the SNR penalty associated with higher-order modulation is too high in practice. Academics like to play with this, but so far PAM6 and PAM8 have not made it into high-volume products.
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