1 July 1990 Possibilities and limitations of space-variant holographic optical elements for switching networks and general interconnects
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Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22125
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany
Optical interconnects of arbitrary design require space-variant optics. Planar holographic optical elements (HOE) offer a high flexibility and ease of production. HOE work via diffraction causing chromatic aberrations. This problem becomes serious if semiconductor lasers with poor wavelength stability should be used. Estimates for the number of independent space-variant interconnects their spatial tolerances and their wavelength stability will be considered. 1 . INTRODUC liON Optical interconnects enable the transmission of signals with ultra high frequencies with small crosstalk and rather low waste energy per transmission line. Two fields of application for optical wiring concepts can be discerned i. e. fixed pattern chip to chip (or board to board) interconnects and reconfigurable switching networks or bus systems where the interconnect path is selected out of a number of fixed interconnects by means of e. g. so-called exchange bypass modules (EBM)1''2. 2. INTERCONNECT CONCEPTS A general feature of optical interconnects is the fact that the light has to leave the board/chip-plane in order to give room for the interconnect fabric i. e. the light leaves the board-plane perpendicularly The necessary optical means are: collimating or focussing elements deflectors and beamsplitters(fanout). Gratings or more general holograms seem the most promising optical elements. These elements may be planar and can be configurated in an arbitrary manner. HOE3 can be used for the above mentioned purposes . Efficient HOE can be obtained either by using thick
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Johannes Schwider, Johannes Schwider, Wilhelm Stork, Wilhelm Stork, Norbert Streibl, Norbert Streibl, Reinhard Voelkel, Reinhard Voelkel, } "Possibilities and limitations of space-variant holographic optical elements for switching networks and general interconnects", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.22125; https://doi.org/10.1117/12.22125

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