http://www.poet-technologies.com/news/poet-operations-update.html

As previously announced, POET intends to commercialize its integrated resonant cavity detector as its first product and demonstrate this prototype by the end of 2016

This was back in April 2016, What has become of this nobody knows? Its very perplexing. I can only assume it prototypes either didn't happen or customers didn't like what they saw (difficult to believe based on the results). Or perhaps the companies involved are very secretive and info sensitive i.e. Military. Therefore nothing has been disclosed.