The Photonically Optimized Embedded Microprocessors (POEM) is DARPA program. It should demonstrate photonic technologies that can be integrated within embedded microprocessors and enable energy-efficient high-capacity communications between the microprocessor and DRAM. For realizing POEM technology CMOS and DRAM-compatible photonic links should operate at high bit-rates with very low power dissipation.[1]
Currently research in this field is at University of Colorado, Berkley University, and Nanophotonic Systems Laboratory (Ultra-Efficient CMOS-Compatible Grating Coupler Design).