Rocking filter in microstructured fiber for high resolution hydrostatic pressure measurements

Abstract

We report on sensing characteristics of the rocking filter fabricated in specially designed microstructured fiber with enhanced sensitivity to hydrostatic pressure. The filter shows a very high sensitivity to pressure ranging from 16.2 to 32.2 nm/MPa, depending on the resonance order. Extremely low cross-sensitivity between pressure and temperature 27÷66×10 3 K/MPa has also been recorded and therefore the rocking filter can be used for pressure measurements with mbar resolution with no need for temperature compensation.