Linearized interrogation of FDML FBG sensor system using PMF Sagnac interferometer

Hwi Don Lee; Eun Joo Jung; Myung Yung Jeong; Chang-Seok Kim

doi:10.1117/12.835253

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5 October 2009 Linearized interrogation of FDML FBG sensor system using PMF Sagnac interferometer

Hwi Don Lee, Eun Joo Jung, Myung Yung Jeong, Chang-Seok Kim

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Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 750355 (2009) https://doi.org/10.1117/12.835253
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

A novel linearized interrogation method is presented for Fourier-domain mode locked (FDML) fiber Bragg grating (FBG) sensor system. In the ultra high-speed regime over 10 kHz modulation, only sine wave is available to scan a center wavelength of FDML wavelength-swept laser instead of conventional triangular wave. However, sine wave modulation has been suffered an exaggerated nonlinear filter response in demodulating the time-encoded parameter into the absolute wavelength. The linearized demodulation is demonstrated by the third order polynomial conversion of filter between the time-encoded parameter and wavelength-encoded parameter based on the spectral information of polarization maintaining fiber (PMF) Sagnac interferometer.

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Hwi Don Lee, Eun Joo Jung, Myung Yung Jeong, and Chang-Seok Kim "Linearized interrogation of FDML FBG sensor system using PMF Sagnac interferometer", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750355 (5 October 2009); https://doi.org/10.1117/12.835253

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