Thin-Core-Fiber-Based Long-Period Fiber Grating for High-Sensitivity Refractive Index Measurement


We experimentally demonstrated the fabrication of uneven long-amount fiber gratings (LPFGs) in thin core fiber by use of centered CO two laser beam. The proposed device exhibits a high extinction ratio of over 25 dB at the resonant wavelength and a narrowed three-dB bandwidth of only nm, which is almost one order of magnitude smaller than that of LPFGs in standard single-mode fibers. It also exhibits a high polarization-dependent loss of over twenty dB at resonant wavelength. The temperature and external refractive index (RI) sensitivity of the proposed structure are measured to be 46 pm/°C, within a temperature vary from 25 °C to a hundred °C, and 1047.3 nm/RIU, inside the RI vary from 1.400 to 1.440, respectively. The temperature induced error is ∼eight% for RI measurement. Such long LPFGs might notice potential applications of highly sensitive RI sensors in the fields of chemical and biomedical sensing.

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