基于光纤马赫-曾德尔干涉仪的强度测量研究

Displacement Measurement of Intensity Modulation Based on All Optical Fiber Mach-Zehnder Interferometer

根据光外差检测原理,分析得到干涉测量适用于信号光强小于参考光强的探测,直接测量适用于信号光强大于参考光强的探测的结论。利用自制的全光纤马赫-曾德尔干涉仪系统,对位移信号进行了测量。实验结果表明:当位移信号较小时,干涉测量的灵敏度分别为62.068μW/mm和9.90mV/mm,而非干涉测量的灵敏度分别为4.30μW/mm和0.35mV/mm;当位移信号较大时,干涉测量的灵敏度分别为2.643mV/mm和0.055mV/mm,非干涉测量的灵敏度分别为12.326mV/mm和4.194mV/mm,测量结果与分析得到的结论一致。对于光纤干涉仪强度调制检测的应用具有参考价值。

According to the principle of optical heterodyne measurement, the interferometry is suitable for the signal whose intensity is weaker than reference signal, while the non-interference survey （direct measurement） is suitable for the signal whose intensity is stronger than reference signal. By using our self-made all optical fiber Mach-Zehnder interferometer, the displacement signal is measured. The experiment results show that the sensitivity of interference measurement is respectively 62. 068 μW/mm and 9.90 mV/mm, and the sensitivity of non-interference measurement is 4. 30 μW/mm and 0. 35 mV/mm when the amount of displacement is lower. When the displacement is larger, the sensitivity of interference measurement is respectively 2. 643 mV/mm and 0. 055 mV/mm and the sensitivity of non-interference measurement is 12. 326 mV/mm and 4. 194 mV/mm. The experiment results are in keeping with the conclusion of our analysis. This work makes reference for the application of the intensity modulation measurement of all optical fiber interferometer.