Measurements of sensitivity of the single-mode photonic crystal holey fibre to temperature, elongation and hydrostatic pressure

Using a specially developed spectral interferometric method, we measured the sensitivity to temperature, elongation and hydrostatic pressure of silica holey fibre with hexagonal symmetry, operating in a single-mode regime. The susceptibility of the group refractive index to those parameters determined with our measurement method is respectively equal to dN/dT = +1.28 × 10−5 K−1, dN/de = −0.40 1/strain and dN/dp = −1.0 × 10−5 MPa−1.