Also take another look at POET's "near-term solution" in their published white paper and see more similarities for an optical interface chip. The patent describes the connection of a face down POET chip onto a Si-based set of waveguides. This is what is described as a proprietary mating technique in the white paper:

http://www.poet-technologies.com/wp-content/uploads/2013/07/Optical-Interconntion-of-High-Speed-Circuits.pdf