How does an optical CPU work?

[haugen]

A few days ago a buddy of mine showed me a two year old article, telling that Israel have developed an optical CPU. I did check i further and it is true, but I can not understand how such a device can work..
Is there anyone who could explain it to me?

 

[wolram]

I think this is along the same lines.

http://www.innovations-report.com/h...d a pure silicon photonic band gap material.]