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Proceedings Paper

Directional multiplexing for optical board-to-board interconnections
Author(s): Karl-Heinz Brenner; Ulrich W. Krackhardt; Robert Klug
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Paper Abstract

Optical signal transmission benefits, among other features, from its huge potential of multiplexing. Besides WDM or time multiplexing a new kind ofmultiplexing is possible: directional multiplexing. Measurements are presented showing that in short fiber transmission lines the angle 9 between the symmetry axis of a fiber and the principle propagation direction of a beam is conserved over distances in the order of 1 meter. So, provided a beam is coupled into a fiber under a certain off-axis angle 3 it will couple out of the fiber with the same off-axis angle. This conservation behavior can be used for coding different channels for multiplexed transmission and can provide a high bandwidth interconnection between chips or boards, i.e. within computers in a single fiber. Based on the experimental set-up used in this work an estimation on the degree ofmultiplexing will be given. Additionally, suitable components for multiplexing and de-multiplexing have to be designed. That is, on the one hand different signal channels have to be coded into different angles before being coupled into the fiber. On the other hand the directional spectrum of the outcoming beams has to mapped to different positions on a detector plane. Particular attention is paid to the de-multiplexing component: A specially designed diffractive optical element (DOE) serves as a mapping device between directional spectrum and spatial positions on the detector plane.

Paper Details

Date Published: 22 May 1998
PDF: 3 pages
Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); doi: 10.1117/12.308884
Show Author Affiliations
Karl-Heinz Brenner, Univ. Mannheim (Germany)
Ulrich W. Krackhardt, Univ. Mannheim (Germany)
Robert Klug, Univ. Mannheim (Germany)

Published in SPIE Proceedings Vol. 3490:
Optics in Computing '98
Pierre H. Chavel; David A. B. Miller; Hugo Thienpont, Editor(s)

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