Strain and thermal sensitivities of germanate and tellurite glass fibres were measured using a fibre Fabry-Perot (FFP)
interferometer and fibre Bragg gratings (FBG). The strain phase sensitivity for germanate and tellurite fibre were
5900×103 rad/m and 5600×103 rad/m respectively at a central wavelength of 1540nm using FFP interferometer, which is
consistent with the value of 1.22pm/με obtained for a germanate fibre FBG. The Young's modulus for germanate and
tellurite fibre were also measured to be 58GPa and 37GPa. The thermal responses of germanate fibre were examined as
24.71 and 16.80 pm/°C at 1540nm and 1033nm wavelength using the FBG.
The invited paper explains the transmission properties of a range of near-, mid-, and far-IR optical fibres for their
applications in chemical and biological sensing. Methods for the fabrication of single and multiple-core mid-IR fibres are
discussed in view of controlling the thermal and viscosity properties for fibre drawing. In particular, the need for
removing impurity bands in the 5000 to 1000 cm-1 range is explained. The importance of engineering multi-core fibres
is also discussed for simultaneous measurements of Raman, IR and surface plasmon enhanced modes together with say,
temperature using a mid-IR transmitting tellurite fibre e.g. in a chemical process. The paper explains the principles and
advantages of evanescent wave coupling of light at the resonant frequency bands for chemical sensing using a fibre
evanescent wave spectroscopic sensor having a GeTeSe chalcogenide fibre. Using fibre based techniques, measurements
for Cr6+ ions in solution and As3+ and As5+ in solids have been characterized at visible and mid-IR regions, respectively.
In this paper we also explain the importance of using mid-IR fibres for engineering novel laser and broadband sources
for chemical sensing.
We have measured the phase sensitivity to temperature of a fibre Fabry-Perot (FFP) formed by splicing multimode
tellurite (TeO2) glass fibre to singlemode silica fibre. The free spectral ranges of two FFPs of different lengths were
consistent with the values expected from independent determinations of the core refractive indices. The phase sensitivity
was 89.3 ± 0.3rad m-1 K-1 at a central wavelength of 1536 nm, compared with 99.8 rad m-1 K-1 for silica fibre.
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