Comment by anigbrowl

I found this article extremely hard to understand, and the linked abstract was not much more help. My impression is that the device can take light coming into one of several input ports and through some magic of nonlinear optics, ensure that it all ends up at a single output port, something like a funnel. I was unable to determine anything about what this routing mechanism is (heating a substrate, maybe?), if the routing is dynamically changeable, or it works in reverse, eg light coming in can be routed to one of several output ports. The latter would seem like a breakthrough, but my impression is that what's described here is more proof-of-concept than prototype.