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Proceedings Paper

Linearized interrogation of FDML FBG sensor system using PMF Sagnac interferometer
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Paper 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.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750355 (5 October 2009); doi: 10.1117/12.835253
Show Author Affiliations
Hwi Don Lee, Pusan National Univ. (Korea, Republic of)
Eun Joo Jung, Pusan National Univ. (Korea, Republic of)
Myung Yung Jeong, Pusan National Univ. (Korea, Republic of)
Chang-Seok Kim, Pusan National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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