A method for determining at least one optical property of an optical device
comprises providing an optical input signal that includes first and second
signal components that are modulated at first and second frequencies,
respectively, and that have first and second polarization states,
respectively. The optical input signal is passed to an optical device. An
optical output signal from the optical device is separated into first and
second output signals that have third and fourth polarization states,
respectively. The first and second output signals are each compared with
reference signals at the first and second frequencies to provide four
phase shift and amplitude measurements that can be used to determine the
at least one optical property of the optical device as a function of
wavelength.
