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

Shen, Fangcheng, Wang, Changle, Sun, Zhongyuan, Zhou, Kaiming, Zhang, Lin and Shu, Xuewen (2017). Small-period long-period fiber grating with improved refractive index sensitivity and dual-parameter sensing ability. Optics Letters, 42 (2), pp. 199-202.

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.

Publication DOI: https://doi.org/10.1364/OL.42.000199
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2017-01-15
Authors: Shen, Fangcheng
Wang, Changle
Sun, Zhongyuan
Zhou, Kaiming ( 0000-0002-6011-1912)
Zhang, Lin ( 0000-0002-1691-5577)
Shu, Xuewen

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