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环境温度变化和振动会引起光纤马赫-曾德干涉仪两臂相差随机性变化,致使干涉仪输出不稳定.本文研究了自然条件下外界温度和振动对基于3×3耦合器干涉仪的影响,分析结果表明,温度和振动所引起的干扰主要集中于100Hz以下的低频成分中.为了消除这些干扰,设计了单臂补偿的反馈回路以稳定输出信号,并提出了一种利用象限判决方法来区分反馈正负性的动态补偿方法.实验中利用3×3耦合器3个输出端中其中2个进行光电变换、差分放大等反馈电路后驱动管状压电陶瓷,使缠绕在其上的光纤伸缩,动态补偿干涉仪相差的漂移,稳定干涉仪输出即3×3耦合器第三输出端口的信号.针对自然环境下温度和振动引起的干扰,本文研制了一种稳定的动态补偿装置,能有效抑制160Hz以下的低频干扰,实时补偿干涉仪两臂的相差漂移,干涉仪输出稳定的干涉信号,波动幅度小于5.64%.
Ambient temperature changes and vibration will cause random changes in the fiber arms Mach-Zehnder interferometer, resulting in unstable output of the interferometer.This paper studies the influence of external temperature and vibration on the 3 × 3 coupler interferometer under natural conditions, The analysis results show that the temperature and vibration caused by the interference mainly concentrated in the low frequency components below 100Hz.In order to eliminate these disturbances, designed a single arm compensation feedback loop to stabilize the output signal, and proposed a quadrant decision method to distinguish Feedback positive and negative dynamic compensation method.In the experiment, 3 × 3 couplers are used to drive the tubular piezoelectric ceramic after two photoelectric conversion and differential amplifying feedback circuits of three output terminals, so that the optical fiber wound thereon is extended and contracted, The phase difference of the dynamic compensated interferometer drifts, and the output of the stable interferometer is the signal of the third output port of the 3 × 3 coupler. In view of the interference caused by the temperature and vibration in the natural environment, a stable dynamic compensation device is developed in this paper, Low-frequency interference below 160Hz, real-time compensation for the two arms of the interferometer drift, interferometer output stable interference signal, the fluctuation range of less than 5.64%.