19 November 1999
Vol 286, Issue 5444

About The Cover

Cover image expansion

COVER Output of a semiconductor nonlinear optical interferometer used in digital signal regeneration at very high speed (the trace shows signal probability as a function of time). Such devices are being developed to directly process the optical data signals carried in fiber-optic networks for the Internet and telecommunications, without needing conversion to electronic signals. This topic is part of the Frontiers in Optics special section beginning on p. 1499 [Image: D. Cotter et al.]