Abstract
Long period fiber grating (LPFG) around the dispersion turning point (DTP) is fabricated with femtosecond laser direct writing. The fabricated grating exhibits dual resonances in its transmission spectrum, which are typical in DTP-LPFG. Resonant peaks generated from high order (3rd) diffraction can be observed when the grating is immersed in aqueous glycerol solution. The resonant wavelengths of experimentally observed peaks agree well with those theoretically predicted by phase matching condition, revealing the correspondence of the peaks with certain cladding modes. The responses of the fabricated grating to surrounding refractive index is also investigated, confirming the high sensitivity of DTP-LPFG. The additional high order resonances can serve as a reference for dual- or multi- parameter sensing applications.
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