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

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

doi:10.1364/OL.42.000199

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

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

^*Corresponding author for this work

Aston Institute of Photonic Technologies (AiPT)

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	199-202
Number of pages	4
Journal	Optics Letters
Volume	42
Issue number	2
Early online date	5 Jan 2017
DOIs	https://doi.org/10.1364/OL.42.000199
Publication status	Published - 15 Jan 2017

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10.1364/OL.42.000199

Fiber grating with improved refractive index sensitivity
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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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AU - Shen, Fangcheng

AU - Wang, Changle

AU - Sun, Zhongyuan

AU - Zhou, Kaiming

AU - Zhang, Lin

AU - Shu, Xuewen

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

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