Abstract
In this paper, we report on the fabrication, characterization, and sensing applications of a
high-birefringence suspended-core fiber (HB-SCF) using the stack-and-draw technique. Capillaries in two sizes were
used for stacking, forming an elliptical core, giving rise to geometric modal birefringence of the HB-SCF. Through a
finite-element method, the theoretical values of the phase and group modal birefringence of the HB-SCF were found to
be
$2.59 \times 10^{-4}$
and
$4.75 \times 10^{-4}$
, respectively. Based on a Sagnac interferometer (SI), the group modal
birefringence of the HB-SCF was measured to be
$4.84 \times 10^{-4}$
, which agrees well with the theoretical result. The sensing characteristics of the HB-SCF SI for pressure, strain, and
torsion measurements were analyzed theoretically and investigated experimentally. It exhibits sensitivities of
2.82 nm/MPa for hydrostatic pressure, 0.43 pm/μϵ for strain, and 0.0157/° for torsion measurements.
The HB-SCF is made entirely of pure silica without stress-applying parts, thus its modal birefringence is thermally
insensitive, resulting in a low temperature sensitivity of ∼1 pm/°C.
© 2014 IEEE
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