Modeling and measurement of accuracy/distortion in an operationally passive FBG demodulation technique

M. D. Todd; M. Seaver; F. Bucholtz; J. M. Nichols; S. T. Trickey

doi:10.1117/12.684786

1 November 2006 Modeling and measurement of accuracy/distortion in an operationally passive FBG demodulation technique

M. D. Todd, M. Seaver, F. Bucholtz, J. M. Nichols, S. T. Trickey

Proceedings Volume 6371, Photonic Sensing Technologies; 63710G (2006) https://doi.org/10.1117/12.684786
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

A system for interrogating fiber optic Bragg grating arrays at kiloHertz sampling rates with sub-microstrain resolution was presented recently. The system makes use of a tunable fiber Fabry-Perot filter for demultiplexing and a path-imbalanced Mach-Zehnder interferometer for wavelength conversion. The operationally-passive demodulation technique for the interferometer makes use of probing the 3x3 coupler at the interferometer output for its coupling parameters to execute the technique. In this work, we discuss the effects of how errors in determining these parameters translate into measurement error and harmonic distortion. We compare measured effects in the laboratory with predictive models to give error sensitivity metrics. We also consider two modes of sampling errors for such frequency-modulated systems and propose a generalized sampling criterion for minimizing harmonic distortion and measurement error.

Citation Download Citation

M. D. Todd, M. Seaver, F. Bucholtz, J. M. Nichols, and S. T. Trickey "Modeling and measurement of accuracy/distortion in an operationally passive FBG demodulation technique", Proc. SPIE 6371, Photonic Sensing Technologies, 63710G (1 November 2006); https://doi.org/10.1117/12.684786

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