Hey, reading up on the new(ish) PAM4 QSFP28 optics and I don’t quite understand the benefits of them.
So, right now I can buy a QSFP28-LR which is good for 10KM or a QSFP28-ER which is good for 30KM. This is at 100G. There are 40G and 10G options that can get 40KM and 80KM respectively.
So reading about PAM4 (https://www.smartoptics.com/article/100g-dwdm-pluggable-transceivers-pam-4-coherent/)
It seems that: “it needs amplification to get out of the blocks and dispersion compensation to go beyond 5-6km. A separate DWDM multiplexer with an amplification system and dispersion compensation is therefore required to connect data centers together”
Soooo why would I go a PAM4 optic if I need the additional amp and DCM even before it gets to LR and ER distances?
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