Abstract A Brillouin optical time-domain reflectometer(BOTDR) system based on optical domain demodulation is proposed. Based on the traditional microwave electro-optic modulation BOTDR system, a dual-pass unbalanced Mach–Zehnder interferometer is added to demodulate the optical signal before the photoelectric conversion, which realizes the optical domain demodulation and reduces the frequency of the signal The positioning and temperature sensing experiments are carried out. The positioning error is 3.7 m at a distance of 8170 m, and the minimum error of temperature measurement is 0.08 °C in the range of 25 °C–55 °C.

中文翻译：

---

BOTDR系统中一种基于光域解调的定位测温新方法

摘要 提出了一种基于光域解调的布里渊光时域反射计(BOTDR)系统。在传统微波电光调制BOTDR系统的基础上，增加了双通非平衡马赫-曾德干涉仪对光电转换前的光信号进行解调，实现了光域解调，降低了信号的频率、定位和温度进行传感实验。距离8170m时定位误差为3.7m，在25℃～55℃范围内测温最小误差为0.08℃。