A bit more infomation who Vivek Rajgarhia is and what he was doing lately at MACOM:
"Macom readies its silicon photonics platform for 400G " (Tuesday, April 16, 2019)
http://www.gazettabyte.com/home/2019/4/16/macom-readies-its-silicon-photonics-platform-for-400g.html