All-optical wavelength conversion based on parallel dual-pump four-wave mixing in semiconductor optical amplifier for OFDM optical signal

All optical wavelength conversion based on four-wave mixing in a SOA for OFDM optical signal is theoretically and experimentally investigated. 2 Gbit/s OFDM is used to modulate directly on the signal lightwave by an external intensity modulator. The modulated signal lightwave and the parallel pumps are coupled and then injected into the SOA for wavelength conversion based on four-wave mixing (FWM). Experimental result shows that the newly converted wavelength sideband carries OFDM signals and its conversion efficiency relates with the wavelength spacing between the pumps, the wavelength spacing and polarization angle between the pumps and signal lightwave. The BER curves and receive constellation are also measured.