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在相干光通信和高速光纤通信等领域,要求偏振变换器具有高的偏振变换精度。对由两个可独立旋转的λ/4波片和一个可独立旋转的λ/2波片组成的三波片偏振变换器的偏振变换误差进行了详细的分析。利用二维几何方法推导出了由波片方位角误差造成的偏振变换误差模型,并进行了数值计算。研究结果表明,三波片不同的组合方式对偏振态的变换精度有影响。其中,λ/4+λ/2+λ/4组合具有最高的偏振变换精度,λ/2+λ/4+λ/4次之,λ/4+λ/4+λ/2的最差;经三种偏振变换器变换后偏振态的方位角的变换误差较大,变换后偏振态的椭率角的误差很小;三种偏振变换器都可以实现较高精度的任意偏振态变换。
In the fields of coherent optical communication and high-speed optical fiber communication, the polarization converter is required to have high polarization conversion accuracy. The polarization conversion error of a three-wave plate polarization converter consisting of two independently rotatable λ / 4 plates and one independently rotatable λ / 2 plate is analyzed in detail. The two-dimensional geometric method was used to derive the polarization transformation error model caused by the azimuth error of the wave plate, and the numerical calculation was carried out. The results show that the different combinations of three-wave plate have an impact on the accuracy of the polarization state transformation. Among them, the combination of λ / 4 + λ / 2 + λ / 4 has the highest polarization conversion accuracy, λ / 2 + λ / 4 + λ / 4 times, λ / 4 + λ / 4 + λ / 2; The transformation errors of the azimuths of the polarization state transformed by the three kinds of polarization converters are large, and the error of the ellipticity angle of the transformed polarization state is small. All three kinds of polarization converters can achieve any polarization state transformation with higher accuracy.