Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity

Xuantung Pham; Jinhai Si; Tao Chen; Ruize Wang; Lihe Yan; Houjun Cao; Xun Hou

doi:10.1063/1.5025645

Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity

Xuantung Pham
, Jinhai Si
, Tao Chen
, Ruize Wang
, Lihe Yan
, Houjun Cao
, Xun Hou

Faculty of Electronic and Information Engineering

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

23 Scopus citations

Abstract

In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance "cut-off wavelengths." The idea of a "cut-off wavelength" and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401-1.4570 RI range when our proposed demodulation method is used.

Original language	English
Article number	174501
Journal	Journal of Applied Physics
Volume	123
Issue number	17
DOIs	https://doi.org/10.1063/1.5025645
State	Published - 7 May 2018

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title = "Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity",

abstract = "In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance {"}cut-off wavelengths.{"} The idea of a {"}cut-off wavelength{"} and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401-1.4570 RI range when our proposed demodulation method is used.",

author = "Xuantung Pham and Jinhai Si and Tao Chen and Ruize Wang and Lihe Yan and Houjun Cao and Xun Hou",

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doi = "10.1063/1.5025645",

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T1 - Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity

AU - Pham, Xuantung

AU - Si, Jinhai

AU - Chen, Tao

AU - Wang, Ruize

AU - Yan, Lihe

AU - Cao, Houjun

AU - Hou, Xun

PY - 2018/5/7

Y1 - 2018/5/7

N2 - In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance "cut-off wavelengths." The idea of a "cut-off wavelength" and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401-1.4570 RI range when our proposed demodulation method is used.

AB - In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance "cut-off wavelengths." The idea of a "cut-off wavelength" and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401-1.4570 RI range when our proposed demodulation method is used.

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DO - 10.1063/1.5025645

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VL - 123

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 17

M1 - 174501

ER -

Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity

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