Here is what Subhash had to say regarding combining Silicon with GaAs ...

Dr. Deshmukh commented: “I see tremendous potential with POET Technology’s innovative approach to combining Si based IC’s with III-V materials based optical components on the same chip that could revolutionize the mobility, telecommunications/networking, large data management, and other technology sectors. I am very excited to be part of the team to drive this innovation into the market”.

So regarding the Fan-Out with GaAs elements ..... makes you wonder.

ST