为了进一步提高传感系统的灵敏度，在一片铌酸锂晶片上设计双平行非对称马赫-曾德尔干涉仪型光波导结构，并在光波导的周围设计分段电极，实现方向相反的电光调制，为此研制出尺寸为78 mm×14 mm ×7.5 mm的集成光波导电场传感器。采用LTspice仿真软件设计一种跨阻抗平衡光电探测电路，采用差分法实现对共模噪声的抑制，从而提高电场传感器的灵敏度。实验结果表明，传感系统时域可测电场强度范围为33~3000 V/m，线性动态范围为35 dB，适用于弱电场的时域测量。

In order to further improve the sensitivity of the sensing system, a bi-parallel asymmetric Mach-Zehnder interferometer optical waveguide structure is designed on a lithium niobate wafer, and segmented electrodes are designed around the optical waveguide to achieve electro-optical modulation in the opposite direction. For this purpose, an integrated optical waveguide electric field sensor with a size of 78 mm×14 mm×7.5 mm is developed. The LTspice simulation software is used to design a cross-impedance balance photoelectric detection circuit, and the difference method is used to suppress common mode noise, so as to improve the sensitivity of the electric field sensor. The experimental results show that the time-domain measurable electric field intensity range of the sensing system is 33?3000 V/m, and the linear dynamic range is 35 dB, which is suitable for the time-domain measurement of weak electric fields.