I tried to get a dashed curved brace but I didn't got exactly what I expected. Here is the code I used and the result below.
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\usetikzlibrary{calligraphy}
\begin{document}
\begin{tikzpicture}
\draw [dashed, decorate, decoration={calligraphic curved parenthesis, amplitude=10pt}] (0,0) -- (0,2);
\draw [dashed, decorate , decoration={calligraphic curved parenthesis , amplitude=10pt}] (2,2) -- (2,0);
\end{tikzpicture}
\end{document}

Does anybody know why the brace is not fully dashed like in the example here?
I guess it's a compatibility problem between dashed option and calligraphy library.
Thanks in advance