Okay Carl: I did come across this article dated 2022 but guess who is behind it? ......... Koos.
I can't help but wonder if LWLG supplied the ....... uh...... PERK.
We demonstrate cryogenic operation of a silicon-organic hybrid (SOH) Mach-Zehnder modulator. The device is based on a dedicated material formulation and allows for 50 Gbit/s on-off-keying (OOK) at 4 K - a record-high line rate generated by an MZM at this temperature.