A novel highly sensitive temperature sensor based on all-fiber polarization interference filter with Vernier effect is proposed and experimentally demonstrated in this article. The all-fiber polarization interference filter, namely Lyot filter, is simply consisted of a section of polarization-maintaining fiber positioned between two linear fiber polarizers. Vernier effect is introduced by simply cascading a Fabry–Perot interference with the Lyot filter. The temperature characteristics of the Lyot filter without and with Vernier effect are experimentally investigated, respectively. The experimental results show that with Vernier effect, the temperature sensitivity of Lyot filter can be improved from −1.752 nm/°C to −25.289 nm/°C. To the best of our knowledge, this is the first demonstration of Lyot filter based temperature sensor combining with Vernier effect. The good performance of the Lyot filter with Vernier effect in temperature sensing not only provides a new option for the optical fiber temperature sensor, but also further broadens the application of Lyot filter in the sensing field.

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基于具有游标效应的全光纤偏振干涉滤光片的高灵敏度温度传感器

本文提出了一种基于具有游标效应的全光纤偏振干涉滤光片的新型高灵敏度温度传感器，并进行了实验验证。全光纤偏振干涉滤光片，即 Lyot 滤光片，简单地由位于两个线性光纤偏振器之间的一段保偏光纤组成。游标效应是通过简单地将 Fabry-Perot 干涉与 Lyot 滤波器级联来引入的。分别通过实验研究了没有和有游标效应的 Lyot 滤波器的温度特性。实验结果表明，利用游标效应，Lyot滤波器的温度灵敏度可以从-1.752 nm/°C提高到-25.289 nm/°C。据我们所知，这是结合游标效应的基于 Lyot 滤波器的温度传感器的首次演示。具有游标效应的Lyot滤波器在温度传感方面的良好性能不仅为光纤温度传感器提供了新的选择，而且进一步拓宽了Lyot滤波器在传感领域的应用。