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Proceedings Paper

On-the-fly message patching in free-space optical interconnects
Author(s): Iaakov Exman; Larry Rudolph
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Paper Abstract

Free-space optical interconnects are exploited to solve general purpose computing tasks which remap structured sets of information. These tasks -- viz. load balance, monitoring, fault tolerance, shadowing -- can all be based upon elementary message patching operations. It is shown that usual assumptions in optical computing -- the redundancy of numbers, as in dual rail representation -- suffice to perform recoding, thus patching, in elegant ways. Smart recoding schemes, may be even less redundant than dual-rail. For monitoring of large-scale computer systems, small numbers of smallitors are added/removed as needed in between processor clusters. Smallitors Snatch-&-Patch messages, by intercepting and partially deflecting optical information. Smallitors are small in size and in complexity. Once one is given enough bandwidth, the next critical limiting resource is latency. This is a prime reason behind the on-the-fly patching approach in free-space optics. Smallitors strive to minimize latency, by turning on additional bits in parallel, thereby recoding the transmitted ones. Recoding schemes and their optical implementation, are discussed within concrete computing tasks. Observations from actual prototypes are also considered.

Paper Details

Date Published: 13 August 1993
PDF: 12 pages
Proc. SPIE 1972, 8th Meeting on Optical Engineering in Israel: Optoelectronics and Applications in Industry and Medicine, (13 August 1993); doi: 10.1117/12.151093
Show Author Affiliations
Iaakov Exman, Hebrew Univ. of Jerusalem (Israel)
Larry Rudolph, Hebrew Univ. of Jerusalem (Israel)

Published in SPIE Proceedings Vol. 1972:
8th Meeting on Optical Engineering in Israel: Optoelectronics and Applications in Industry and Medicine
Moshe Oron; Itzhak Shladov; Yitzhak Weissman, Editor(s)

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