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简要介绍了目前超长距离光纤干涉传感系统的发展现状,并在理论上分析了光纤传感系统中的偏振态对消光比的影响以及能够影响光波偏振态的各种因素。将基于光弹效应的挤压型偏振控制器应用于该系统的消光比调谐,给予光纤干涉臂径向应力,动态调谐系统光波偏振态,实现了长距离光纤传感系统的消光比在一点上的调谐。提出了长距离光纤传感系统灵敏度的新调谐方法,消光比动态调谐范围为0.21~11.03 dB。
This paper briefly introduces the current development of ultra-long-distance optical fiber interferometric sensing system and theoretically analyzes the influence of polarization state on extinction ratio in optical fiber sensing system and various factors that can affect the polarization state of light wave. Extrusion polarization controller based on photoelastic effect is applied to the extinction ratio tuning of the system, which gives the radial stress of the optical fiber interfering arm and dynamically adjusts the polarization state of the optical system. The extinction ratio of the long-distance optical fiber sensing system is realized at one point Tuning. A new method of tuning the sensitivity of long-distance optical fiber sensing system is proposed. The dynamic tuning range of the extinction ratio is 0.21 ~ 11.03 dB.