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设计了一种三波片型偏振态发生器(PSG),分析PSG的结构特点,导出了Stokes参量的变换关系。基于禁忌搜索(Tabu Search,TS)算法原理,提出了一种既能实现偏振态的快速变换又能降低晶体两端电压的控制算法。仿真结果表明,采用该控制算法,PSG能够将输入的线偏光转换为任意偏振光,绝对精度可达0.07%。如果把Stokes参量S2和S3限定在Poincare球的特定区域内,通过该控制算法可产生所需的偏振态并保证控制电压大小在120 V以内。最后,通过实验验证该算法能够满足单光束连续变量相干光通信编码的需要。
A three-wave plate Polarization State Generator (PSG) is designed to analyze the structural characteristics of PSG and to derive the transform relationship of Stokes parameters. Based on the tabu search (TS) algorithm principle, a control algorithm that can not only achieve fast change of polarization state but also reduce the voltage across the crystal is proposed. The simulation results show that PSG can convert input line polarization into arbitrary polarization with the control algorithm, the absolute accuracy can reach 0.07%. If the Stokes parameters S2 and S3 are confined to a specific area of the Poincare sphere, this control algorithm produces the desired polarization and guarantees that the control voltage is within 120V. Finally, the experimental results show that the proposed algorithm can meet the needs of single-beam continuous-variable coherent optical communication coding.