Abstract
Novel characteristics of spun fiber grating-based sensors are presented in this paper. These gratings were written into special spun fibers with certain intrinsic linear birefringence and short spinning periods. Due to the modal conversion and averaging effect in spun fibers, the introduced linear birefringence enables the spun fibers and spun fiber gratings to have certain resistance to external perturbations, such as transverse pressure and bending. Furthermore, short-period fiber Bragg gratings (FBGs) always exhibit multiple side peaks near the main Bragg peak in their reflection spectra. In term of the main Bragg peak, these spun FBG sensors have similar strain and temperature coefficients to those of traditional FBGs, but weaker polarization dependence. On the other hand, those side reflection peaks have strong polarization dependences, which can be used to simultaneously monitor the change of input polarization state.
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