This Letter proposes a highly birefringent one-air-hole panda fiber, which is fabricated by corroding a single stress zone of the traditional panda-type polarization-maintaining fiber (PMF). An additional geometric asymmetry is induced in the fiber to increase the birefringence effect and enhance the light–matter interaction, which improves the performance of the sensor and the device applications of the special fiber. A theoretical and experimental analysis of the one-air-hole panda fiber demonstrates that the birefringence of the fiber can be of the order of 10⁻³, which is one order of magnitude higher than that of the traditional panda-type fiber. The corroded region provides a microchannel to be filled with a functional material to compose optical fiber sensors; a sample of a salt solution was filled into the microchannel to measure the refractive index with a sensitivity of 3760 nm/RIU (refractive index units).

中文翻译：

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高双折射单气孔熊猫光纤

本文提出了一种高双折射单气孔熊猫光纤，它是通过腐蚀传统熊猫型保偏光纤（PMF）的单个应力区而制成的。在光纤中引入额外的几何不对称性以增加双折射效应并增强光与物质的相互作用，从而改善传感器的性能和特种光纤的设备应用。单气孔熊猫光纤的理论和实验分析表明，该光纤的双折射率可以达到10 ^{-3的量级。}，比传统的熊猫型纤维高一个数量级。腐蚀区域提供微通道，填充功能材料构成光纤传感器；将盐溶液样品填充到微通道中以测量折射率，灵敏度为 3760 nm/RIU（折射率单位）。