We investigate experimentally all-optical clock recovery for return-to-zero (RZ) and nonreturn-to-zero (NRZ) differential phase-shift keying (DPSK) signals at using a passively mode-locked quantum-dot Fabry–Perot (QD-FP) semiconductor laser. The QD-FP laser exhibits a beat spectrum linewidth of , which enables a recovered clock signal with a root-mean-square timing jitter of for the RZ-DPSK signal and for the NRZ-DPSK signal. The timing jitter of the recovered clock signal is characterized for different values of the input signal power and the input signal optical signal-to-noise ratio.
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