  Traditional methods for measurement of Polarizing Beamsplitter (PBS)
parameters, especially the extinction ratio, require highly polarized light
sources, alignment procedures and/or experimental parameters that change over
time, such as polarization rotations. In this work, a new method is presented,
which employs unpolarized light and a Faraday Mirror. It is shown that precise
extinction ratio and insertion loss values can be achieved in three
single-sweep measurements, without any alignment requirements or time-varying
signals of any kind.
