Shift and splitting of resonant peaks in long-period fiber gratings for sensing applications

We also applied long period fibre gratings (LPFGs) to various sensing application such as bend, transverse load, and index change sensors by using the peak-splitting effect of LPFGs. Furthermore, since the lower order cladding mode is insensitive to the external perturbation change compared with the higher order cladding modes,We will discuss a simple method to change the transmission characteristics of long-period fiber gratings using UV post-exposure. Application of the resonant peak splitting to bend, transverse load, and index change sensing will be described.