By utilizing the cross polarization modulation ( CPM) effect in SOA, conversion performance is significantly improved by introducing a polarization control structure to the original XGM converter. Both inverted and non-inverted conversion are achieved in right same the wavelength converter. 利用SOA中的交叉偏振调制(CPM)效应,在XGM波长转换器中引入偏振控制结构,大大改善了转换性能,并在同一个波长转换器中实现了正反相的波长转换。