Abstract
We theoretically and experimentally demonstrated the existence of dual loss peaks in the transmission spectrum of long-period fiber gratings (LPFGs) fabricated in a parameter-optimized two-mode fiber for the mode coupling between LP01 and LP11 modes by CO2 laser. The two dips moved in opposite directions with decreasing grating period and merged at a critical grating period. The strain and temperature sensitivities of the two resonant dips were 10 times those of the unoptimized LPFG. An LPFG-aided interferometric sensor with high modulation depth and low insertion loss was fabricated. The LPFG-based sensor and LPFG-aided interferometric sensor can be used for strain and temperature discrimination with high sensitivity.
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