@azonenberg I think I have a few old 850nm SFPs that were used for fiber channel so it's 4 Gbps max IIRC. I would not spend money on a pair of 10G SFP for such a hack lol
edit: ah I did not think about AGC. hmm.
edit2: also retimers will be a problem if they do clock recovery. We'll see. a breakout does not look too hard to build.
I think i found the one-chip-does-all: https://eu.mouser.com/datasheet/2/268/SY100EPT28L_3_point_3V_LVTTL_to_Diff_LVPECL_and_Di-1891475.pdf