A novel strain and temperature sensor based on the fiber Bragg grating (FBG) cascaded two-tapered four-core fiber (FCF) Mach–Zehnder interference (MZI) is proposed and fabricated. The two optical fiber tapers, acting respectively as a beam splitter and a coupler, are able to produce interference phenomena, so the high interference extinction ratio (above 20 dB) can be obtained. The attenuation peak at 1562 nm and the FBG center wavelength at 1550 nm in the transmission spectra are, respectively, selected to represent MZI and FBG as the monitoring wavelengths. The results indicate that the sensitivities of MZI to strain and temperature are −1.83 pm μ ϵ −1 and 46.93 pm C −1 , respectively, and those of FBG to strain and temperature are 1.26 pm μ ϵ −1 and 10.58 pm C −1 , respectively. Both the FBG and MZI exhibit insensitivity to the refractive index. The cascaded sensor has good linearity and is applied to measure the strain and te...

中文翻译：

---

基于光纤光栅级联双锥四芯光纤马赫曾德尔干涉仪的应变和温度传感器

提出并制造了一种基于光纤布拉格光栅（FBG）级联两锥四芯光纤（FCF）马赫-曾德尔干涉（MZI）的新型应变和温度传感器。分别用作分束器和耦合器的两个光纤锥度能够产生干扰现象，因此可以获得高的干扰消光比（20 dB以上）。选择透射光谱中在1562nm处的衰减峰和在1550nm处的FBG中心波长以将MZI和FBG表示为监测波长。结果表明，MZI对应变和温度的敏感性分别为-1.83 pmμ-1 -1和46.93 pm C -1，而FBG对应变和温度的敏感性分别为1.26 pmμ-1 -1和10.58 pm C -1 ， 分别。FBG和MZI均对折射率不敏感。