interesting: Single-chip microprocessor that communicates directly using light

" Here we report an electronic–photonic system on a single chip integrating over 70 million transistors and 850 photonic components that work together to provide logic, memory, and interconnect functions. This system is a realization of a microprocessor that uses on-chip photonic devices to directly communicate with other chips using light."
http://www.nature.com/nature/journal/v528/n75...16454.html