CAJ | 학술논문

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。
반파전압시전광상위조제기적일개중요지표，침대현유반파전압측량방법존재적측량오차대、측량장치복잡등문제，제출료기우격광상공진광속소묘원리적반파전압측량방법。통과이론분석，득도료원장주광속적편이량화상위조제기반파전압적관계표체식。탑건료1×2전광섬격광상공진광로，대니산리파도상위조제기적반파전압진행료실험측량，개변상위조제기적가재전압，기록다폭원장광강분포도，통과구평균치감소측량오차，이차근거원장광강분포적변화득도료상위조제특성곡선。결과표명，해방법측량장치간단，불부가이정학지측량반파전압，환가이대상위조제선성도진행분석，구유중요적공정응용개치。
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 1×2 all- fiber laser phased array system was built and the half- wave voltage of the LiNbO3 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.