22 May 1998 Directional multiplexing for optical board-to-board interconnections
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Proceedings Volume 3490, Optics in Computing '98; (1998) https://doi.org/10.1117/12.308884
Event: Optics in Computing '98, 1998, Bruges, Belgium
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Karl-Heinz Brenner, Karl-Heinz Brenner, Ulrich W. Krackhardt, Ulrich W. Krackhardt, Robert Klug, Robert Klug, } "Directional multiplexing for optical board-to-board interconnections", Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); doi: 10.1117/12.308884; https://doi.org/10.1117/12.308884

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