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If you have larger fiber-optical setups to draw, you might want to have a look at pst-optexp. This is a package specifically developed for drawing free-ray and fiber-optical setups. Here a small example: \documentclass[margin=5pt, pstricks]{standalone} \usepackage{pst-optexp} \begin{document} \begin{pspicture}(8,2) \psset[optexp]{fiber=none, ...


What it boils down to in the very end is that you probably shouldn't try to use \usetikzlibrary in a group. With a bit of paring down, the error already occurs in \documentclass{article} \usepackage{pgf,tikz} \begin{document} \begingroup \usetikzlibrary{decorations.pathmorphing} \endgroup \tikzstyle{kringel}=[decoration={random steps}] ...

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