All-optical wavelength conversion scheme to reduce the crosstalk among the two multiplexed channels for polarization multiplexing system

This paper presents the polarization rotation effect in SOA for polarization-multiplexed signals. Based on the theoretical analysis, a polarization diversity parallel dual-pump FWM scheme to reduce the crosstalk between the two multiplexed channels is proposed. The comparison on several factors including the frequency spacing between two pumps, different modulated data rate and the conversion efficiency, are investigated by simulation. Moreover, we have discussed the injection current of SOA in different modulated data rate. The optimum injection current of SOA is studied for the 40 Gbit/s data. The results indicate that the proposed scheme is better than the conventional scheme.