Abstract
A novel fiber optic bend sensor is implemented by using a re-grown tilted
fiber Bragg grating (TFBG) written in a small core single mode fiber with UV
overexposure. The spectrum of the re-grown TFBG contrasts with that of
normal TFBG by exhibiting large differences in the amplitude between
neighboring symmetric $({\rm LP}_{0{\rm m}})$ and asymmetric $({\rm LP}_{1{\rm m}})$ cladding mode resonances, moreover each asymmetric cladding mode
resonance splits into two peaks (corresponding to two orthogonal
polarization states). The differential response of the three individual
resonances of such group provides quantitative information about the
magnitude and directions of bends in the TFBG. Numerical simulations
indicate that the changes in the cladding-mode profiles in a bent fiber are
responsible for this behavior through their impact on coupling coefficients.
A bend sensitivity of 0.4 dB. m (for the 18th order group of cladding modes)
is experimentally demonstrated within a range of 0–10.6 m$^{- 1}$.
© 2010 IEEE
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