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.

© 2010 Optical Society of America

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