Abstract
We show that pulse waveform analysis based on ultrafast xy-field sampling can correctly
estimate the complete polarization-mode dispersion (PMD) vector over the
signal bandwidth. The xy-field
sampling, implemented as polarization-diversity coherent detection with
short local pulses, can observe the time-resolved complex amplitude for
x- and y-polarizations at ultrafast time
scales. By fully characterizing the temporal response of the xy polarized fields after transmission,
their Fourier transforms directly yield the output Jones matrix in the
frequency domain. Analysis of the matrix provides complete PMD analysis.
Consequently, while measuring the waveform distortion of the transmitted
pulse train, the technique can quantify a key contributing factor. In
addition, a perspective on using this concept to realize rapid PMD
estimation is provided. By employing the pulses comprised of two independent
state of polarizations (SOPs) as a probe, the two SOP evolutions for
individual inputs are captured simultaneously. The analysis algorithm
applies the Müller matrix method. This scheme requires neither
wavelength sweeping nor input polarization switching, which indicates the
possibility of rapid characterization of the Müller matrix and the PMD
vector within the probe bandwidth; further study on the measurement range
and accuracy is required.
© 2012 IEEE
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