In all other cases, where the two components either do not have the same amplitudes and/or their phase difference is neither zero nor a multiple of 90°, the polarisation is called elliptical polarisation because the electric vector traces out an ellipse in the plane (the polarisation ellipse). This is shown in the above figure on the right. Detailed mathematics of polarisation is done using Jones calculus and is characterised by the Stokes parameters.
in all other cases where the two components either do not have the same amplitudes and/or their phase difference is neither zero nor a multiple of 90° the polarisation is called elliptical polarisation because the electric vector traces out an ellipse in the plane (the polarisation ellipse) this is shown in the above figure on the right detailed mathematics of polarisation is done using jones calculus and is characterised by the stokes parameters