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A scheme of polarization-mode-dispersion(PMD)mitigation in a polarization-division-multiplexing(PDM)sys-te is proposed and demonstrated with 2×10 Gb/s retu-to-zero on-off-keying(RZ-OOK)transmission.Si-multaneous mitigation for two polarization tributaries of the PDM signal is achieved based on the self-phase-modulation(SPM)effect and offset filtering in a polarization nonlinear loop configuration.The improvement of eye-diagram-based signal-to-noise ratio(SNR)is 3.5 dB in the presence of a 7.2-ps differential-group delay(DGD)when the pulsewidth of the PDM signal is～16.6 ps.