Holographic space-variant prism arrays for free-space data permutation in digital optical networks

Harald Kobolla; Frank Sauer; Johannes Schwider; Norbert Streibl; Reinhard Voelkel

doi:10.1117/12.47040

1 September 1991 Holographic space-variant prism arrays for free-space data permutation in digital optical networks

Harald Kobolla, Frank Sauer, Johannes Schwider, Norbert Streibl, Reinhard Voelkel

Proceedings Volume 1507, Holographic Optics III: Principles and Applications; (1991) https://doi.org/10.1117/12.47040
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

Networks for parallel data processing consist of processing stages and permutation stages. The permutation stages provide the interconnection between the processing stages, thereby changing the order of the different data channels. The authors propose a free-space implementation of optical permutation stages with holographic optical elements. The holographic elements used are space-variant prism (or plane grating) arrays. Each light beam (or data channel) is incident on its own grating and gets deflected by a corresponding individual angle. Such space-variant holographic prism arrays can easily be produced with an adequate step-and-repeat recording setup. This technique is flexible in that it allows the realization of arbitrary permutation patterns. And it is light efficient if one uses a high-quality holographic recording material like dichromated gelatin. The authors fabricated holographic permutation elements in dichromated gelatin and show examples for the Butterfly and for the Perfect Shuffle permutation patterns. The data of the elements are related to the signal-to-noise requirements in actual digital systems. These requirements are directly fulfilled for off-axis geometries. But also on-axis permutation elements can be of practical use if one takes additional care to get rid of the zeroth diffraction order noise.

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Harald Kobolla, Frank Sauer, Johannes Schwider, Norbert Streibl, and Reinhard Voelkel "Holographic space-variant prism arrays for free-space data permutation in digital optical networks", Proc. SPIE 1507, Holographic Optics III: Principles and Applications, (1 September 1991); https://doi.org/10.1117/12.47040

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KEYWORDS

Holography

Signal to noise ratio

Prisms

Diffraction

Digital holography

Optical components

Data processing

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