Abstract
In this paper, the sensitivity characteristics of Fabry-Perot (F-P)
hydrostatic pressure sensor based on two different hollow-core (HC) microstructured
optical fibers are experimentally and theoretically investigated. The sensors
are fabricated by simply splicing a length of HC fiber to singlemode fibers.
Hydrostatic pressure is measured by monitoring the wavelength shifts of the
interferometric fringes as a result of the two reflection beams at the splicing
points. The measured pressure sensitivities of F-P sensors fabricated on the
simplified HC microstructured fiber and hollow-core photonic bandgap fiber
(HC-PBGF) are -17.3 and -23.4 pm/MPa, respectively. Theoretical investigation is then carried
out based on the analysis of elastic properties for the individual fibers.
The calculated result suggests that the pressure sensitivities are dominantly
determined by the induced changes in cavity length. In comparison, the contribution
of mode-index change is slight. The mechanisms behind the mode-index changes
for the two fibers are clarified by analyzing the deformation of the fiber
structure under pressure. The holey microstructure is highly deformable compared
to the solid fiber, which provide another dimension for the implementation
of tunable photonic devices.
© 2013 IEEE
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