Abstract
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
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription