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:doi:10.3788/COL201917.070601

Chinese Optics Letters, 2019, 17 (7): 070601, Published Online: Jun. 21, 2019

Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure Download： 755次

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

Author Affiliations

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

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

Figures & Tables

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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Table1. 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[J]. Chinese Optics Letters, 2019, 17(7): 070601.

Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure Download： 755次

Fig. 1. Structure of the sensor.

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.

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

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

Fig. 5. Transmission of TCF with different lengths.

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

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

Table1. Coupling Coefficients of Modes at Different Core Radii

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Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure Download： 755次

Fig. 1. Structure of the sensor.

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.

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

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

Fig. 5. Transmission of TCF with different lengths.

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

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

Table1. Coupling Coefficients of Modes at Different Core Radii

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