Abstract

Based on the coupled-mode theory of tilted long-period fiber gratings (TLPFGs) and the dual-peak resonance theory, we build the structure of a TLPFG with the phenomenon of dual-peak resonance. The influences of grating tilt angle, grating structure parameters, surrounding refractive index (SRI), and film optical parameters on the dual-peak resonance are analyzed in the transmission spectra of this structure. As the results show, the characteristics of the dual-peak resonance in the ($1m$) cladding modes and the ($2m$) cladding modes are similar, and the sensitivity of the ($2m$) cladding modes to refractive index, as well as the grating tilt angle, grating structure parameters, and film optical parameters, is higher than that of the ($1m$) cladding modes in this structure. The research provides the theoretical foundation for design of a dual-peak resonance coated TLPFG sensor for SRI, gas, humidity, pH, bending curvature, and strain.

© 2017 Optical Society of America

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