实验验证了一种结构简单的10 Gbit/s非归零信号(NRZ)通过高非线性光子晶体光纤（PCF）的四波混频（FWM）效应实现了单抽运偏振不敏感和宽范围可调谐全光波长转换。利用50 m光子晶体光纤较高的双折射效应，固定抽运光的偏振态与高非线性光子晶体光纤的双折射轴成45°夹角入射，信号光与抽运光在光子晶体光纤中进行四波混频时，其变换效率对信号光偏振态的随机变化不敏感，闲频光输出功率几乎保持不变。实验结果表明，所搭建的全光波长变换器在28 nm变换范围内，闲频光偏振敏感度低于1 dB，随着10 Gbit/s的信号光偏振态的变化，波长变换效率优于-13 dB的偏振不敏感全光波长变换器，闲频光信号Q因子大于7。

A single pump polarization-insensitive and widely tunable all-optical wavelength conversion for 10 Gbit/s non-return-to-zero (NRZ) signal is experimentally demonstrated by means of four-wave-mixing (FWM) in highly nonlinear photonic crystal fiber (PCF). The residual birefringence in the 50 m dispersion-flattened guarantees the FWM-based wavelength conversion to be polarization insensitive when the pump polarization is exactly at 45° to the birefringent axes of the PCF. Experimental results show that the polarization dependence of FWM in the PCF can be decreased to be less than 1 dB over 28 nm of wavelength tunable operation.The conversion efficiencies are better than -13 dB and the Q factor of idler signal is larger than 7 over the conversion range with signal polarization change.