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Photonic crystal fibers (PCFs) are increasingly used for optical sensing due to their tunable structural and dispersion properties. Pressure sensing with PCFs is of interest, but current designs often have nonlinear sensitivity and limitations at high pressures.
This study introduces a novel water-filled PCF design to achieve enhanced pressure sensitivity by utilizing water's compressibility to improve chromatic dispersion responsiveness.
Numerical simulations were conducted to analyze how pressure affects chromatic dispersion and birefringence in both polarization modes of the proposed PCF.
The water-filled PCF demonstrates a linear increase in pressure sensitivity, with the y-polarization mode reaching 100-185 ps/nm-km/bar at 200 bar and the x-polarization mode reaching 115-70 ps/nm-km/bar. This is a significant improvement over conventional air-filled PCFs, which show a nonlinear decrease in sensitivity with increasing pressure (47-30 ps/nm-km/bar for x-polarization and 60-40 ps/nm-km/bar for y-polarization).
The proposed water-filled PCF design offers superior pressure sensitivity, making it a promising candidate for high-precision pressure sensing applications in various fields.
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