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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)199-202
Number of pages4
JournalOptics Letters
Volume42
Issue number2
Early online date5 Jan 2017
DOIs
Publication statusPublished - 15 Jan 2017

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