理论分析了光纤干涉型光学相控阵扫描角度与扫描控制电压的关系, 提出了扫描角度与电压关系的实验方法, 即按照场点定点的光强间接测定一定扫描控制电压对应的扫描角度; 采用M-Z型干涉光路来模拟2光路的光纤干涉型相控阵进行模拟实验, 通过改变相位调制器上的控制电压, 对场点定点接收到的光强大小进行测试, 反演出光纤干涉型相控阵实际的扫描角度。实验结果表明: 扫描控制电压在相位调制的半波电压范围内, 扫描控制电压要比集成波导阵列的控制电压小得多,扫描角度为0~6.2 mrad, 在此范围内, 扫描角度的实验值与理论值较好吻合。该模拟实验研究可以为光纤干涉型光学相控阵的远场扫描特性的进一步研究提供参考。

The relationship between scanning angle and scanning control voltage of fiber interferometric optical phased array was analyzed theoretically. An experimental method of the relationship between scanning angle and voltage was proposed, which was that the scanning angle corresponding to a certain scanning control voltage was measured indirectly according to the light intensity at a fixed point in the field. In the simulation experiment, the M-Z interferometric optical path was used to simulate the two-path optical fiber interferometric phased array. By changing the control voltage of the phase modulator, the intensity of the light received at the fixed point of the field was tested, and the actual scanning angle of the optical fiber interferometric phased array was calculated. The experimental results show that when the scanning control voltage is in the half-wave voltage range of phase modulation, and the scanning control voltage is much lower than that of integrated waveguide arrays, the scanning angle is 0-6.2 mrad. In this range, the experimental value of the scanning angle is in good agreement with the theoretical value of the scanning angle. The simulation experiment can provide a reference for further study of far-field scanning characteristics of optical fiber interferometric phased array.