建立了空芯带隙型光子晶体光纤残余双折射理论分析模型，采用全矢量有限元法研究了光纤残余双折射产生的原因，最后搭建实验平台对空芯带隙型光子晶体光纤的残余双折射进行测试，并对光纤双折射的波长依赖性和温度稳定性进行了探究。仿真与实验结果表明，纤芯残余形变是导致残余双折射的重要因素，残余双折射随纤芯椭圆率的增大而增大，同时残余双折射的波长依赖性显著，温度依赖系数为0.3×10-9/℃。

A new set of tunable phase-only filters for realizing the transverse superresolution is introduced. The filters, whose significant features are their ability to tune and simplicity, consist of one half-wave plate between two quarter-wave plates, and the half-wave plate is made of two zones that can rotate with respect to each other. Through analyzing the transverse point spread function of such system, it can be concluded that by rotating any zone of the half-wave plate, the transverse resolution can be realized and can be tunable.