||N. Streibl, K. H. Brenner, A. Huang, J. Jahns, J. Jewell,
A. W. Lohmann, D. A. B. Miller, M. Murdocca, M. E. Prise, T. Sizer,
"Digital Optics" Proceedings of the IEEE, 77, 1954-1969, (1989).
authors discuss digital optics, a technology for processing, transport, and storage of
optical digital information. Digital optics offers both the high temporal bandwidth of
fiber communications and the high connectivity and information density of optical imaging.
The energy dissipation per bit of communicated information, as well as the chip area
dedicated to interconnections, can be significantly lower in optics than in high-speed
electronics. This motivates the introduction of parallel optical interconnections through
free space in communication-intensive areas of digital information processing such as
switching in telecommunications and within multiprocessors. Digital optical circuits can
be constructed by cascading two-dimensional planar arrays of optical logic gates
interconnected in free space. The state of the art and the trends in digital optical
information processing systems for optical logic, optoelectronic interfaces, and optical
free-space interconnection systems are reviewed
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