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We introduce a scheme for multi-impairment performance monitoring at ultrahigh bit rates based on cross-phase modulation (XPM) in a nonlinear waveguide. We demonstrate that we can simultaneously monitor in-band optical signal-to-noise ratio and group velocity dispersion at bit rates of 320 Gb/s (return-to-zero format) from a single measurement. Our approach retrieves the autocorrelation of the signal...
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