AxisPositionX¶

This parameter is used to specify a possible bending of the waveguide or the fiber. In the following, this parameter is denoted by $x_0$ .

The $y$ coordinate is not changed, whereas the $x, z$ coordinates are mapped accordingly to

$\begin{eqnarray*} \left(x, z \right) & \mapsto & (x_0,0)+\sqrt{(x-x_0)^2+z^2} \left( \cos(\varphi), \sin(\varphi) \right), \end{eqnarray*}$

with $\varphi = \mathrm{atan2}(z, x-x_0)$ , transforming a straight waveguide to a circular waveguide with center axis $x=x_0,z=0.$

It is required that $x_0$ is positioned outside the computational domain.