Comparison of transverse load sensitivities of fibre Bragg gratings in different types of optical fibres

摘要

The response of optical fibre Bragg gratings (FBG) to transverse load was found to be significantly different for FBGs inscribed in two different types of single mode optical fibres. The transverse load sensitivity, defined as the relative wavelength separation of the birefringence-induced FBG double-peaks per transverse line-force, was found to be C_q = (45.1 ± 1.5)10~(-9)1/N for a moderately GeO_2 doped (GF1B) and C_q = (48.5 ± 1.0)10~(-9)1/N for a highly GeO_2 doped (PR2008) optical fibre. These data are important for a complete characterization of the opto-mechanical behavior of FBG sensor elements inscribed in different types of single mode optical fibres.