All-Optical NRZ-to-RZ Data Format Conversion with Picosecond Duration-Tunable and Pedestal Suppressed Operations

SUMMARY We demonstrate an all-optical picosecond pulse durationtunable nonreturn-to-zero (NRZ)-to-return-to-zero (RZ) data format conversion using a Raman amplifier-based compressor and a fiber-based fourwave mixing (FWM) switch. A NRZ data signal is injected into the fiberbased FWM switch (AND gate) with a compressed RZ clock by the Raman amplifier-based compressor, and convert to RZ data signal by the fiberbased FWM switch. The compressed RZ clock train acts as a pump signal in the fiber-based FWM switch to perform the NRZ-to-RZ data format conversion. By changing the Raman pump power of the Raman amplifierbased compressor, it is possible to tune the pulse duration of the converted RZ data signal from 15 ps to 2 ps. In all the tuning range, the receiver sensitivity at bit error rate (BER) of 10 −9 for the converted RZ data signal was about 1.3 ∼1.7 dB better than the receiver sensitivity of the input NRZ data signal. Moreover, the pulse pedestal of the converted RZ data signals is well suppressed owing to the FWM process in the fiber-based FWM

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