They more or less enumerated the verticals in the article. Six in total, 2 initially the other 4 later.
Telecom and artificial intelligence businesses will also be among the early customers to commercialize POET products with light sources for Artificial Intelligence accelerator chips, sensing platforms for wearables and medical tech, LiDAR solutions for automated driving, hardware for Internet of Things (IoT) devices, and improvements for AR/VR to follow.
So:
Telecom
AI
Wearables/Medical
LiDAR
IOT
AR/VR