High-Speed Wavelength Conversion of RZ-DPSK Signal Using FWM in a Quantum-Dot SOA

We demonstrate an all-optical wavelength conversion of a return-to-zero differential phase-shift keying (RZ-DPSK) signal using four-wave mixing in a quantum-dot semiconductor optical amplifier. We successfully achieved low penalty operation of 0.56 dB using 40-Gb/s RZ-DPSK signal.