A method of analyzing an input signal, the method including the steps of: (a) dividing a first input signal into first and second orthogonal signal polarization components; (b) dividing a second input signal into orthogonal first and second orthogonal local polarization components; (c) mixing the first orthogonal signal component with the second orthogonal local polarization component to provide a first mixed signal; (d) mixing the second orthogonal signal component with the first orthogonal local polarization component to provide a second mixed signal; (e) analyzing the first and second mixed signal to determine the polarization or phase information in the input signal.