title: Multimode excitation-induced phase shifts in intrinsic Fabry-Perot interferometric fiber sensor spectra.
abstract: We 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.
authors.affiliation: Center for Photonics Technology, Bradley Department of Electrical and Computer Engineering,Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0111, USA. cma1@vt.edu
authors.forename: Cheng
authors.initials: C
authors.lastname: Ma
authors.forename: Anbo
authors.initials: A
authors.lastname: Wang