Jinyu Zhang, Fang Ren, Yiying Zhang, Xiaojie Fan, Rui Hao, Jingjing Niu, Jianping Wang. Design and Analysis of Weakly-Coupled Eccentric-Core Few-Mode Fiber for Sensing Application[J]. Acta Optica Sinica, 2020, 40(24): 2406001
- Acta Optica Sinica
- Vol. 40, Issue 24, 2406001 (2020)
Fig. 1. Schematic diagram of ECOF structure. (a) Schematic of cross section; (b) refractive index profile
Fig. 2. Structural parameter min Δneff versus the core radius R1 and relative refractive index difference Δ
Fig. 3. Mode field distribution of ten modes at the core radius R1=10.2 μm and relative refractive index difference Δ=0.94%
Fig. 4. Relationship between effective refractive index and wavelength at R1=10.2 μm and Δ=0.94%. (a) Variation of neff with wavelength; (b) variation of Δneffwith wavelength
Fig. 5. Relationship between the effective refractive index of ten modes and eccentric distance. (a) LP51; (b) LP03; (c) LP22; (d) LP41; (e) LP12; (f) LP31; (g) LP02; (h) LP21; (i) LP11; (j) LP01
Fig. 6. Relationship between normalized intensity and eccentric distance. (a) Core region; (b) coating region
Fig. 7. Relationship between normalized optical intensity and refractive index of coating at different eccentric distances. (a) L=52.3 μm; (b) L=50.3 μm; (c) L=48.3 μm; (d) L=0 μm
Fig. 8. Relationship between bending loss and bending radius at different bending orientations. (a) Bending direction of 0°; (b) bending direction of 180°
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