Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure

Zuliang Ruan; Li Pei; Jingjing Zheng; Jianshuai Wang; Liangying Wu; Tigang Ning; Ji Wang

doi:10.3788/COL201917.070601

Chinese Optics Letters, Volume. 17, Issue 7, 070601(2019)

Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure

Zuliang Ruan^1,2, Li Pei^1,2、*, Jingjing Zheng^1,2, Jianshuai Wang^1,2, Liangying Wu^1,2, Tigang Ning^1,2, and Ji Wang^1,2

Author Affiliations

¹Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China

²Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China

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Figures & Tables(8)

Fig. 1. Structure of the sensor.

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Fig. 2. (a) Coupling coefficient curve in the range of the dotted line in (b). (b) The curve of the coupling coefficient as a function of wavelength from 1300 to 1700 nm.

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Fig. 3. (a) Transmission spectrum of LPFGs with different periods. (b) Maximum ER after adding LPFGs.

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Fig. 4. Double-sided dips at different grating periods.

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Fig. 5. Transmission of TCF with different lengths.

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Fig. 6. Transmission spectrum of the first four modes after low-pass filtering and the transmission spectrum of the first two modes.

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Fig. 7. (a) Variation of the transmission spectrum with external RI. (b) Relationship between light intensity and external RI.

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Table 1. Coupling Coefficients of Modes at Different Core Radii
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Table 1. Coupling Coefficients of Modes at Different Core Radii
$η$ $a_{t, 1} = 1.3 μm$ $a_{t, 1} = 1.5 μm$ $a_{t, 1} = 1.7 μm$
${LP}_{01}$ 0.2420 0.4003 0.6020
${LP}_{02}$ 0.2024 0.1645 0.0906
${LP}_{03}$ 0.1787 0.1469 0.0997
${LP}_{04}$ 0.1376 0.1096 0.0763
${LP}_{05}$ 0.0957 0.0735 0.0505
${LP}_{06}$ 0.0616 0.0454 0.0303

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Zuliang Ruan, Li Pei, Jingjing Zheng, Jianshuai Wang, Liangying Wu, Tigang Ning, Ji Wang, "Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure," Chin. Opt. Lett. 17, 070601 (2019)

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