POET has plans for Linear Pluggable Optics (LPO).
“Our intent with this collaboration (with Multilane) is to design cost-optimized 800G modules that offer superior performance with both the DSP integrated version as well as Linear Pluggable Optics (LPO) variants.
https://www.linkedin.com/pulse/linear-drive-pluggable-optics-lpo-modules-market-yfpke/
Worth a listen imo.
https://www.youtube.com/watch?v=qhZozMOMYYs