Highly Sensitive Dual-Core Microstructured Fiber Sensor Operating Near the Dispersion Turning Point

作者：Zhang, Zhichao; Yuan, Jinhui^*; Qiu, Shi; Mei, Chao; Zhou, Xian; Wu, Qiang^*; Yan, Binbin; Wang, Kuiru; Sang, Xinzhu; Yu, Chongxiu

来源：IEEE SENSORS JOURNAL, 2023, 23(10): 10489-10499.

DOI：10.1109/JSEN.2023.3264450

• Dispersion turning point (DTP)
• in-line fiber interferometer
• optical fiber sensor
• refractive index (RI) sensor
• temperature sensor

In this article, a highly sensitive dual-core microstructured fiber (DC-MSF) sensor is proposed. Because of the adjustable dispersion characteristic of the DC-MSF, the group refractive index (RI) difference between the y-polarization odd and even supermodes could achieve a zero value at the dispersion turning point (DTP), which makes the DC-MSF sensor have a high sensitivity. The simulation results show that the sensitivity can be up to 52 875 nm/RIU around the RI of 1.4, the operating bandwidth of sensitivity over 104 nm/RIU is 625 nm, and the operating bandwidth of sensitivity over 105 nm/RIU is 100 nm. Moreover, the DC-MSF can also be used as a temperature sensor by coating the polydimethylsiloxane (PDMS) on the surface, and the sensitivity can be up to 23.12 nm/degrees C around 22 degrees C. The detectable RI and temperature ranges of the proposed DC-MSF sensor are 1.375-1.425 and -15 degrees C-95 degrees C, respectively.

• 单位
  南昌航空大学; 1; 北京科技大学