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Shen F, Wang C, Sun Z, et al. Small-period long-period fiber grating with improved refractive index sensitivity and dual-parameter sensing ability. Opt Lett. 2017;42(2):199-202doi: 10.1364/OL.42.000199.
Shen, F., Wang, C., Sun, Z., Zhou, K., Zhang, L., & Shu, X. (2017). Small-period long-period fiber grating with improved refractive index sensitivity and dual-parameter sensing ability. Optics letters, 42(2), 199-202. https://doi.org/10.1364/OL.42.000199
Shen, Fangcheng, et al. "Small-period long-period fiber grating with improved refractive index sensitivity and dual-parameter sensing ability." Optics letters vol. 42,2 (2017): 199-202. doi: https://doi.org/10.1364/OL.42.000199
Shen F, Wang C, Sun Z, Zhou K, Zhang L, Shu X. Small-period long-period fiber grating with improved refractive index sensitivity and dual-parameter sensing ability. Opt Lett. 2017 Jan 15;42(2):199-202. doi: 10.1364/OL.42.000199. PMID: 28081071.
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Opt Lett. 2017 Jan 15;42(2):199-202. doi: 10.1364/OL.42.000199.

Small-period long-period fiber grating with improved refractive index sensitivity and dual-parameter sensing ability.

Optics letters

Fangcheng Shen, Changle Wang, Zhongyuan Sun, Kaiming Zhou, Lin Zhang, Xuewen Shu

PMID: 28081071 DOI: 10.1364/OL.42.000199

Abstract

We UV inscribe and characterize a long-period fiber grating with a period of 25 μm. A series of polarization-dependent dual-peak pairs can be seen in the transmission spectrum, even though only the symmetrical refractive index modification is introduced. The fabricated grating exhibits a lower temperature sensitivity compared with standard long-period gratings and an enhanced refractive index sensitivity of ∼312.5  nm/RIU averaged from 1.315 to 1.395, which is more than four-fold higher than standard long-period gratings in this range. The full width at half-maximum of the fabricated grating is only about 0.6 nm, allowing for high-resolution sensing. Moreover, the grating period is so small that the attenuation dip corresponding to a high-order Bragg resonance can also be seen, which can act as a monitor of the unwanted perturbation to realize dual-parameter sensing.

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