Further to DARPA funding and projects, overview of approved projects for the past 2 years.
large documuments but if you skim to the "ES-01 / ELECTRONIC SCIENCES" section of each, some interesting photonics and related research that may/may not be applicable or related to the types of things POET is working on.
http://www.darpa.mil/attachments/DARPAFY17PresidentsBudgetRequest.pdf
One project from FY2016 that caught my eye (just cause I like the name!) is called the POEM program: Photonically Optimized Embedded Microprocessor (POEM).
http://www.darpa.mil/attachments/(2G1)%20Global%20Nav%20-%20About%20Us%20-%20Budget%20-%20Budget%20Entries%20-%20FY2016%20(Approved).pdf