Splitting of resonances in a curved optical fiber-based Fabry-Perot resonator

In this work, the splitting of resonance lines in a Fabry-Perot resonator formed by section standard curved single-mode fiber with metal-coated ends is investigated numerically and experimentally. It shown that similar to Autler-Townes results from strong coupling between fundamental mode core whispering gallery cladding fiber. The influence all basic parameters on its reflection transmission spectra considered. Prospects for practical application effects studied high-resolution optical refractometry, as well direction further research are outlined.