A novel temperature insensitive refractive index sensor based on dual photonic crystal fiber
Publication Name
Optik
Abstract
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.
Open Access Status
This publication is not available as open access
Volume
226
Article Number
165495
Funding Number
SJCX20_0296
Funding Sponsor
National Natural Science Foundation of China