By systematically examining the tree of possibilities for optoelectron
ic computing architectures and offering arguments that allow one to pr
une suboptimal branches of this tree, I come to the conclusion that el
ectronic circuit planes interconnected optically according to regular
connection patterns represent an alternative that is reasonably close
to the best possible, as defined by physical limitations. Thus I propo
se that this foundation architecture should provide a basis for future
research and development in this area. (C) 1997 Optical Society of Am
erica.