Performance enhancement of vibration sensing employing multiple phase-shifted fiber bragg grating
- Publication Type:
- Journal Article
- Journal of Lightwave Technology, 2011, 29 (22), pp. 3453 - 3460
- Issue Date:
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. © 2011 IEEE.
Please use this identifier to cite or link to this item: