Wide range operation of an all-optical NRZ-DPSK-to-RZ-DPSK regenerative waveform-wavelength conversion with exible width-tunability

For the first time, we demonstrated a wide range operation of an all-optical non-return-to-zero(NRZ)- differential-phase-shift-keying (DPSK)-to-return-to-zero(RZ)-DPSK waveform-wavelength conversion with exible picosecond width-tunablity and regenerative functionality. The scheme is based on a Raman amplifier soliton compressor (RASC) and a ber-based four-wave mixing (FWM) AND-gate. In the first demonstration, we demonstrated waveform-wavelength conversion of a 10-Gb/s DPSK signal without input signal degradation over 54-nm input-output wavelength ranges. The measurement results of the converted RZ-DPSK signal are pedestal-free, and its converted pulse width from 13.0 to 2.87-ps can be adjusted by tuning the Raman pump power between 0.20 and 0.90-W. An investigation of the regenerative waveform-wavelength conversion is further conducted at different Raman pump power settings over 40-km standard single-mode bers without dispersion compensation. Error-free operation with a low power penalty less than -1:95-dB is obtained for the RZ-DPSK regenerated converted signal.