This paper represents the technical core of a precompetitive consortiu
m formed by AT&T, DEC and MIT to study the technology, architecture an
d applications of wide-band all-optical networks of local to national
(or international) extent. This effort is currently partially sponsore
d by the Defense Advanced Research Projects Agency (DARPA). Sections I
and II of this paper provide a general introduction to all-optical ne
tworks and discuss some proposed applications. Sections III, IV and V
cover the architecture, technology and test-bed portions of our effort
.