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Proceedings Paper

Holographic optical elements for optical backplane bus targeted at high speed data transfer
Author(s): Jonathan Ellis; Robert Mays; Dale Griffiths; Hai Bi; Jinho Choi; Wei Jiang; Ray T. Chen
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Paper Abstract

The primary technical challenge for optical backplanes involve the alignment and optical isolation of multiple data channels. Since most backplanes require data transfer rates greater than a single optical channel can costeffectively provide, multiple data channels is the common solution for higher aggregate transfer rates. Established optical alignment and isolation techniques include spatial separation of optical channels, use of lensing elements to focus specific transmitter outputs to specific receiver areas, use of differing wavelengths for adjacent channels with appropriate frequency filtering on receivers, and the use of "light guide tubes" for each channel. This presentation will examine another promising option, the use of "matched" Holographic Optical Elements (HOEs) to provide both cross channel optical isolation and to significantly relax traditional optical alignment requirements. Matched HOEs can both induce upon a transmitted optical stream, and then filter upon a received optical stream, a number of distinguishing characteristics such as wavelength, polarization, phase, and amplitude. Thus the use of a unique "matched HOE" pair with each transmitterreceiver pair of multiple optical data channels can provide an efficient mechanism to isolate individual data streams even when they may be physically coincident, such as in a length of fibre optic or when multiple free space data transmitters illuminate several channel's receiver elements. Thus, the alignment issue is relaxed from the usual constraint of attempting to physically separate channels to one where, as long as the receiver is within the optical cone of it's matched transmitting element, cross channel interference can be effectively eliminated.

Paper Details

Date Published: 28 February 2006
PDF: 12 pages
Proc. SPIE 6126, Photonics Packaging and Integration VI, 612602 (28 February 2006); doi: 10.1117/12.660139
Show Author Affiliations
Jonathan Ellis, Advanced Communications Concepts, Inc. (United States)
Robert Mays, R&D M Foundation (United States)
Dale Griffiths, Information Management Technology (United States)
Hai Bi, Univ. of Texas at Austin (United States)
Jinho Choi, Univ. of Texas at Austin (United States)
Wei Jiang, Univ. of Texas at Austin (United States)
Ray T. Chen, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 6126:
Photonics Packaging and Integration VI
Allen M. Earman; Ray T. Chen, Editor(s)

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