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Proceedings Paper

Design issues for semi-passive optical communication devices
Author(s): I. Glaser
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Paper Abstract

Optical smart cards are devices containing a retro-reflector, light modulator, and some computing and data storage capabilities to affect semi-passive communication. They do not produce light; instead they modulate and send back light received from a stationary unit. These devices can replace contact-based smart cards as well as RF based ones for applications ranging from identification to transmitting and validating data. Since their transmission is essentially focused on the receiving unit, they are harder to eavesdrop than RF devices, yet need no physical contact or alignment. In this paper we explore optical design issues of these devices and estimate their optical behavior. Specifically, we analyze how these compact devices can be optimized for selected application profiles. Some of the key parameters addressed are effective light efficiency (how much modulated signal can be received by the stationary unit given the amount of light it transmits), range of tilt angles (angle between device surface normal to the line connecting the optical smart card with the stationary unit) through which the device would be effective, and power requirements of the semi-passive unit. In addition, issues concerning compact packaging of this device are discussed. Finally, results of the analysis are employed to produce a comparison of achievable capabilities of these optical smart cards, as opposed to alternative devices, and discuss potential applications were they can be best utilized.

Paper Details

Date Published: 18 September 2007
PDF: 9 pages
Proc. SPIE 6668, Novel Optical Systems Design and Optimization X, 66680N (18 September 2007); doi: 10.1117/12.730436
Show Author Affiliations
I. Glaser, Holon Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 6668:
Novel Optical Systems Design and Optimization X
R. John Koshel; G. Groot Gregory, Editor(s)

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