Virginia TechMa, ChengWang, Anbo2014-04-042014-04-042010-11-01Cheng Ma and Anbo Wang, "Multimode excitation-induced phase shifts in intrinsic Fabry-Perot interferometric fiber sensor spectra," Appl. Opt. 49, 4836-4845 (2010). doi: 10.1364/AO.49.0048361559-128Xhttp://hdl.handle.net/10919/46938We report the modal analysis of optical fiber single-mode-multimode-single-mode intrinsic Fabry-Perot interferometer sensors. The multimode nature of the Fabry-Perot cavity gives rise to an additional phase term in the spectrogram due to intermodal dispersion-induced wavefront distortion, which could significantly affect the cavity length demodulation accuracy. By using an exact model to analyze the modal behavior, this phase term is explained by employing a rotating vector approach. Comparison of the theoretical analysis with experimental results is presented. (c) 2010 Optical Society of Americaapplication/pdfen-USIn CopyrightSignal-processing algorithmTemperatureStrainSystemsArticle - Refereedhttp://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-25-4836https://doi.org/10.1364/AO.49.004836