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
- Chinese Optics Letters
- Vol. 17, Issue 7, 070601 (2019)
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.
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Table 1. Coupling Coefficients of Modes at Different Core Radii
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