中文摘要：

半波电压是电光相位调制器的一个重要指标,针对现有半波电压测量方法存在的测量误差大、测量装置复杂等问题,提出了基于激光相控阵光束扫描原理的半波电压测量方法。通过理论分析,得到了远场主光束的偏移量和相位调制器半波电压的关系表达式。搭建了1×2全光纤激光相控阵光路,对铌酸锂波导相位调制器的半波电压进行了实验测量,改变相位调制器的加载电压,记录多幅远场光强分布图,通过求平均值减小测量误差,而且根据远场光强分布的变化得到了相位调制特性曲线。结果表明,该方法测量装置简单,不仅可以精确地测量半波电压,还可以对相位调制线性度进行分析,具有重要的工程应用价值。

英文摘要：

Measuring the half-wave voltage with high accuracy and a simple setup is an important issue for the applications of the electro-optical phase modulator. A new method was proposed which was based on the principal of beam steering in the laser phased array. The relationship between the offset of central beam in far field and the half-wave voltage was formulated by theoretical analysis. The setup of the 1 ×2all-fiber laser phased array system was built and the half-wave voltage of the Li Nb O3 waveguide phase modulator was measured. Several far-field intensity distributions with different loading voltages were recorded and the measuring error was decreased by taking average of the multiple results. What ＇s more,the curve of phase modulation characteristic was obtained according to the multiple far-field intensity distributions. The experimental results show that the proposed method is simple with high accuracy and has important applications in engineering. Meanwhile, the phase modulation linearity can be analyzed.