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

@article{Fu2015ThinCoreFiberBasedLF,
  title={Thin-Core-Fiber-Based Long-Period Fiber Grating for High-Sensitivity Refractive Index Measurement},
  author={Cailing Fu and Xiaoyong Zhong and Changrui Liao and Yi-ping Wang and Ying Wang and Jian Tang and Shen Liu and Qiao Wang},
  journal={IEEE Photonics Journal},
  year={2015},
  volume={7},
  pages={1-8}
}
We experimentally demonstrated the fabrication of asymmetric long-period fiber gratings (LPFGs) in thin core fiber by use of focused CO2 laser beam. The proposed device exhibits a high extinction ratio of over 25 dB at the resonant wavelength and a narrowed 3-dB bandwidth of only 8.7 nm, which is nearly one order of magnitude smaller than that of LPFGs in conventional single-mode fibers. It also exhibits a high polarization-dependent loss of over 20 dB at resonant wavelength. The temperature… CONTINUE READING

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