Parameters
wx : half width of the waist in the XZ plane
wy : half width of the waist in the YZ plane
wf : mode radius of the fiber optic
T : transmission coefficient at the entrance of the fiber optic
lam : wavelength
dx : lateral shift of the fiber optic along X axis
dy : lateral shift of the fiber optic along Y axis
dz : defocus of the the fiber optic along Z axis
tiltx : tilt of the fiber optic around the X axis
tilty : tilt of the fiber optic around the Y axis
C : coupling ratio
