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Performance Enhancement of Vibration Sensing Employing Multiple Phase-Shifted Fiber Bragg Grating

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5 Author(s)
Azmi, A.I. ; Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales Sydney, Sydney, NSW, Australia ; Sen, D. ; Wenjuan Sheng ; Canning, J.
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Multiple phase-shifted fiber Bragg gratings (MPS-FBGs) are proposed for a novel intensity-type vibration sensing scheme with broadband source based interrogation. In this scheme, the collective and simultaneous operation of the subchannels of MPS-FBG multiplies the total acquired signal power change at a particular channel, considerably enhancing sensitivity. Compared to a standard FBG scheme, our experiment scheme attained significant sensitivity enhancement of nearly 20 dB using 17 phase-shifted FBG. These experimental results agree with the theoretical prediction based on cross-correlation relations. The sensitivity enhancement while retaining the system simplicity would be an attractive option for an economical coarse wavelength division multiplexed (CWDM) vibration sensing system based on a single broadband source.

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Lightwave Technology, Journal of  (Volume:29 ,  Issue: 22 )