Abstract

We investigate experimentally all-optical clock recovery for return-to-zero (RZ) and nonreturn-to-zero (NRZ) differential phase-shift keying (DPSK) signals at 40Gbitss using a passively mode-locked quantum-dot Fabry–Perot (QD-FP) semiconductor laser. The QD-FP laser exhibits a beat spectrum linewidth of 80kHz, which enables a recovered clock signal with a root-mean-square timing jitter of 160fs for the RZ-DPSK signal and 240fs 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.

© 2009 Optical Society of America

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