The optical fiber Fabry–Perot interferometer (FPI) based on hollow-core photonic crystal fiber (HCPCF) is proposed.
The temperature sensitivity characteristics of the HCPCF-based FPIs with different structures are analyzed theoretically and experimentally, and different temperature responses of them are demonstrated.
The theoretical analysis and experimental results have important reference and guidance values for the sensor design and application of the HCPCF-based FPI.