This research is supported by the National Natural Science Foundations of China (Grant Nos. 61174018 and 61505097) and Fundamental research funds of Shandong University, China (Grant No.2014YQ009).
An in-line fiber Fabry-Perot interferometer (FPI) based on the hollow-core photonic crystal fiber (HCPCF) for refractive index (RI) measurement is proposed in this paper. The FPI is formed by splicing both ends ...