Zhang Shuo, Geng Tao, Sun Weimin
Opt Lett. 2022 May 1;47(9):2266-2269. doi: 10.1364/OL.455888.
We propose what we believe to be a novel long-period fiber grating (LPFG) based on a polarization-maintaining fiber (PMF) and single-mode fiber. Due to the principal axis of stress, the resonance peak is strongly dependent on the polarization state of the input light. Under different polarization states, the response of the resonance peak to the change of the external environment is different. A single resonance peak can measure several physical quantities without wavelength overlap using polarization multiplexing. The experimental results show that the PMF-LPFG realizes a high sensitivity torsion and bending measurement under different polarization states (-3.27 nm/rad*m and -13.38 nm/m) and can also measure the ambient temperature (84.10 pm/°C). The PMF-LPFG unit has the advantages of small size, high sensitivity, and multi-parameter measurement. The design scheme of the sensor provides a new idea for a multi-parameter sensor.
我们提出了一种基于保偏光纤（PMF）和单模光纤的新型长周期光纤光栅（LPFG）。由于应力主轴的存在，共振峰强烈依赖于输入光的偏振态。在不同的偏振态下，共振峰对外界环境变化的响应是不同的。利用偏振复用技术，单个共振峰可以测量多个物理量而不存在波长重叠。实验结果表明，保偏光纤长周期光纤光栅在不同偏振态下实现了高灵敏度的扭转和弯曲测量（分别为-3.27 nm/rad·m和-13.38 nm/m），并且还能够测量环境温度（84.10 pm/°C）。保偏光纤长周期光纤光栅单元具有尺寸小、灵敏度高和多参数测量的优点。该传感器的设计方案为多参数传感器提供了新思路。
