Abstract

We present a new technique for fiber Bragg grating (FBG) sensor interrogation and multiplexing. The technique combines a scanning bandpass filter used to multiplex by wavelength multiple gratings in a single fiber,and an unbalanced Mach-Zehnder fiber interferometer made with a 3 3 coupler to detect strain-induced wavelength shifts. A demonstration system interrogates four gratings in a single fiber at a sampling rate up to 20 kHz, with a noise floor measured at less than 10 n/Hz above 0.1 Hz.

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  1. A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, C. B. Askins, M. A. Putnam and E. J. Friebele, "Fiber grating sensors", J. Lightwave Technol., vol. 15, pp. 1442-1463, 1997.
  2. A. D. Kersey, T. A. Berkoff and W. W. Morey, "Multiplexed fiber Bragg grating strain-sensor system with a fiber fabry-perot wavelength filter", Optics Lett., vol. 18, pp. 1370-1372, 1993.
  3. Y. Lo, J. S. Sirkis and C. C. Chang, "Passive signal processing of in-line fiber etalon sensors for high strain-rate loading", J. Lightwave Technol., vol. 15, pp. 1578-1586, 1997.

J. Lightwave Technol.

A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, C. B. Askins, M. A. Putnam and E. J. Friebele, "Fiber grating sensors", J. Lightwave Technol., vol. 15, pp. 1442-1463, 1997.

Y. Lo, J. S. Sirkis and C. C. Chang, "Passive signal processing of in-line fiber etalon sensors for high strain-rate loading", J. Lightwave Technol., vol. 15, pp. 1578-1586, 1997.

Optics Lett.

A. D. Kersey, T. A. Berkoff and W. W. Morey, "Multiplexed fiber Bragg grating strain-sensor system with a fiber fabry-perot wavelength filter", Optics Lett., vol. 18, pp. 1370-1372, 1993.

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