Naeem Khurram, Kim Bok Hyeon, Kim Bongkyun, Chung Youngjoo
Opt Express. 2015 Feb 9;23(3):3589-601. doi: 10.1364/OE.23.003589.
We have experimentally investigated the multi-parameter sensing characteristics in a novel all-fiber Sagnac loop hybrid interferometer based on a highly birefringent photonic crystal fiber with two asymmetric cores. The sensor device was based on a combination of two types of in-fiber interferences, the intra-core-mode Sagnac interference and the inter-core-mode Mach-Zehnder interference due to the distinct birefringent properties associated with the asymmetric cores. Fast Fourier transform analysis on the transmission spectra of the device exhibited six clear peaks in the spatial frequency domain. By examining the phase shift responses of two distinct Sagnac and one Mach-Zehnder interference peaks, the response matrix that enable simultaneous measurement of torsion, strain, and temperature could be obtained. The proposed all-fiber Sagnac loop hybrid interferometer has the advantages such as simplicity of the device structure, compact device size, and capability for simultaneous sensing of multiple parameters.
我们通过实验研究了一种基于具有两个不对称纤芯的高双折射光子晶体光纤的新型全光纤萨格纳克环混合干涉仪中的多参数传感特性。该传感装置基于两种类型的光纤内干涉的组合，即由于与不对称纤芯相关的独特双折射特性而产生的芯内模式萨格纳克干涉和芯间模式马赫 - 曾德尔干涉。对该装置传输光谱的快速傅里叶变换分析在空间频率域中显示出六个清晰的峰值。通过检查两个不同的萨格纳克干涉峰和一个马赫 - 曾德尔干涉峰的相移响应，可以获得能够同时测量扭转、应变和温度的响应矩阵。所提出的全光纤萨格纳克环混合干涉仪具有装置结构简单、装置尺寸紧凑以及能够同时传感多个参数等优点。
