While discussing unamplified 100G DWDM over 40km using pluggable QSFP28 optics (https://old.reddit.com/r/networking/comments/jv94f6/100g_dwdm_over_40km_using_pluggable_qsfp28_optics/ ) this little gem came up: 400G-XR ( https://www.infinera.com/innovation/xr-optics )
It's basically a pluggable QSFP28-DD or OSFP 400G optic which you connect via a typical PON topology to multiple clients and then dynamically assign 25G subcarriers to each according to need.
In addition to that it will support client devices from SFP28/QSFP28 up and it will use coherent(!) optics. This means no chromatic dispersion compensation and no amps needed to get out of the gate.
It will even support bidi connections over a single fiber using circulators.
I recall when 100M BiDi was the new hot thing in FTTH networks. We've come a long way.
All credit goes to u/Enrage who helpfully also pointed out that this 400G-XR will die a lonely death due to it being a proprietary, vendor specific standard :)
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