Mix polarization

i faced this term in a special paper. i cant figure it out what it exactly means.

 

sure:
"Polarization dynamics are considered in the presence of an anisotropic Kerr non-lin-
earity in the most common semiconductor waveguide geometry. The equations of
motion are formulated in terms of Stokes polarization parameters and their Hamiltonian
form is derived. Stationary solutions and their stability are found for plane-wave prop-
agation. It is found that the non-integrable problem of mixed-polarization spatial soliton
dynamics can be largely explained in terms of the equivalent plane-wave solutions."

sorry to be so slow to respond.

 

can i understand it like this:

vector E and B are restricted by a series of equations.
if we write it into components, the equations decouples into two decoupled equations. otherwise, we can say it is mixed polarization