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Proceedings Paper

Ultracompact optics for optical wireless communications
Author(s): Juan Carlos Minano; Pablo Benitez; Ruben Mohedano Arroyo; Jose L. Alvarez; Maikel Hernandez; Juan-Carlos Gonzalez; Kazutoshi Hirohashi; Satoru Toguchi
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Paper Abstract

Advanced optical design methods using the keys of nonimaging optics lead to some ultra compact designs which combine the concentrating (or collimating) capabilities of conventional long focal length systems with a high collection efficiency. One of those designs is the so-called RXI. Its aspect ratio (thickness/aperture diameter) is less than 1/3. Used as a receiver, i.e. placing a photodiode at the proper position, it gets an irradiance concentration of the 95% of the theoretical thermodynamic limit (this means for example, a concentration of 1600 times with an acceptance angle of +/- 2.14 degrees). When used as an emitter (replacing the aforementioned photodiode by an LED, for instance), similar intensity gains may be obtained within an angle cone almost as wide as the 95% of the thermodynamic limit. In a real device these irradiance(and intensity)gains are reduced by the optical efficiency. This combination of high concentration factors, relatively wide angles, simplicity and compactness make the optical device almost unique. This work will show the results of the measurements done with several RXI prototypes of 40-mm aperture diameter, all of them made of PMMA (by injection process).

Paper Details

Date Published: 13 December 1999
PDF: 11 pages
Proc. SPIE 3850, Optical Wireless Communications II, (13 December 1999); doi: 10.1117/12.372814
Show Author Affiliations
Juan Carlos Minano, Univ. Politecnica de Madrid (Spain)
Pablo Benitez, Univ. Politecnica de Madrid (Spain)
Ruben Mohedano Arroyo, Univ. Politecnica de Madrid (Spain)
Jose L. Alvarez, Univ. Politecnica de Madrid (Spain)
Maikel Hernandez, Univ. Politecnica de Madrid (Spain)
Juan-Carlos Gonzalez, Univ. Europea de Madrid (Spain)
Kazutoshi Hirohashi, HITS Labs., Inc. (Japan)
Satoru Toguchi, HITS Labs., Inc. (Japan)

Published in SPIE Proceedings Vol. 3850:
Optical Wireless Communications II
Eric J. Korevaar, Editor(s)

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