偏振控制器(PC)是光纤通信系统中非常重要的一个元器件，响应时间及稳定性是决定其性能好坏的主要因素。在理论分析电控PC内部结构和控制原理的基础上，设计了基于数字信号处理(DSP)的PC控制电路并进行了实验验证。分别给电控PC加一路电压和三路电压测试PC的控制性能，得到了与理论分析结果一致的偏振态(SOP)输出；给PC加不同幅度的电压，在一定电压范围内所加信号电压与响应时间成线性关系，由此可根据所加电压计算出PC的响应时间。结果表明，与用电脑控制相比，采用DSP控制电路，响应速度更快，占用空间小并且易于集成，更利于实用化。

Polarization controller (PC) is a key element in optical fiber communication systems. The response time and stability are two major factors which decide the performance of PC. The internal structure and operation of voltage-controlled polarization controller was analyzed in theory. An experiment based on digital signal processor (DSP) controlled circuit was designed and implemented. To test the controlling performance of PC, voltages are applied to only one plate and then three plates separately, the obtained output states of polarization (SOP) agreed well with the theoretical results. Then the amplitude of applied voltages is changed within a certain range, and a linear dependence between the response time and applied voltages was experimentally demonstrated. Consequently, the response time of PC could be estimated by the voltages applied on it. Comparing with that controlled by computers, it shows that PC controlled by DSP is characterized by shortened response time, less space-taking, as well as more favorable to integration and practical application.