I think this was referenced in the Sidoti Investors presentation, June 2020, Slide 5:
Two Technology Platforms:
Optical Interposer Platform
Waveguides with integrated passives enablie wafer-scale fabrication, integration, assembly and testing of photonic and electronic devices on a single platform
Indium Phosphide (InP)
POET designed Lasers, Photodetectors and Modulators manufactured by sub-contractors specifically for the POET Optical Interposer
I think GaAs is in storage for now - maybe a future focus area, but not active in the current strategy. IMHO
killer66