A novel dual photonic crystal fiber (DPCF) temperature insensitive refractive index sensor is proposed in this article. By sequentially splicing lead-in SMF (single mode fiber), PCF_1, PCF_2, and lead-out SMF constitute the Mach-Zehnder interferometer (MZI). The refractive index sensitivity (RIS) of the proposed sensor is improved by making an abrupt-taper on the fusion point of two PCFs. The proposed sensor is compared with a sensor without an abrupt-taper, the RIS value of the proposed sensor is increased by ∼1.9 times. The collapsed area of two photonic crystal fiber air holes is used as a beam splitter and combiner of Mach-Zehnder interferometer. Experimental analysis indicates that the RIS is 152.97 nm/RIU (1.330–1.383 RIU). Besides, the proposed sensor is independent of temperature and its sensitivity towards temperature is only -0.0045 nm/°C (30−80 °C). This sensor has the characteristics of relatively high sensitivity, ease of fabrication, and compact size.

本文提出了一种新型的双光子晶体光纤（DPCF）温度不敏感折射率传感器。通过依次拼接引入的SMF（单模光纤），PCF_1，PCF_2和引出的SMF构成了马赫曾德尔干涉仪（MZI）。通过在两个PCF的融合点上形成一个尖锥，可以提高所提出传感器的折射率灵敏度（RIS）。将拟议的传感器与不带锥度的传感器进行比较，拟议的传感器的RIS值提高了约1.9倍。两个光子晶体光纤气孔的塌陷区域用作Mach-Zehnder干涉仪的分束器和合成器。实验分析表明，RIS为152.97 nm / RIU（1.330–1.383 RIU）。此外，所提出的传感器与温度无关，并且其对温度的灵敏度仅为-0。0045 nm /°C（30-80°C）。该传感器具有相对较高的灵敏度，易于制造以及尺寸紧凑的特征。