Sensitivity Characterization of Cascaded Long-Period Gratings Operating near the Phase-Matching Turning Point.

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ID: 260969
2020
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Abstract
We characterized a cascaded long-period gratings (LPGs)-based sensor that was operating at the phase-matching turning point (PMTP). The cascaded LPGs constructed an in-fiber Mach-Zehnder interferometer (MZI), which exhibited a series of high-quality-factor () narrow-bandwidth resonance peaks. As the LPG operated at the PMTP, the proposed sensor showed an ultrahigh refractive index (RI) and temperature sensitivity, and high measurement precision. In this study, we took an in-depth look at the effects of grating separation on Q-factor and sensitivity. The results showed that the sensitivity to the surrounding refractive index (SRI) reached 4741.5 nm/RIU at 1.4255 and 2138 nm/RIU, over the range of 1.335-1.373. In addition, the temperature sensitivity was around 4.84 nm/°C. With a 0.02 nm wavelength resolution, the RI and temperature sensing limits were 9.3 × 10 RIU and 5.5 × 10 °C.
Reference Key
zhou2020sensitivitysensors Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhou, Wei;Ran, Yanli;Yan, Zhijun;Sun, Qizhen;Liu, Chen;Liu, Deming;
Journal sensors
Year 2020
DOI
E5978
URL
Keywords
quality factor optical fiber sensors long period fiber grating phase-matching turning point

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