Design of Low Crosstalk Few Mode Multi-Core Fiber Based on Heterogeneous Structure

Liu Chang; Pei Li; Xie Yuheng; Wang Jianshuai; Zheng Jingjing; Ning Tigang; Li Jing

doi:10.3788/CJL202047.1106004

Chinese Journal of Lasers, Volume. 47, Issue 11, 1106004(2020)

Design of Low Crosstalk Few Mode Multi-Core Fiber Based on Heterogeneous Structure

Liu Chang, Pei Li^*, Xie Yuheng, Wang Jianshuai, Zheng Jingjing, Ning Tigang, and Li Jing

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

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Figures & Tables(12)

$Refractive index profile of ring core$

Fig. 1. Refractive index profile of ring core

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$Variation curve of the effective refractive index of the optical fiber with r1$

Fig. 2. Variation curve of the effective refractive index of the optical fiber with r₁

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Fig. 3. Variation of the LP₀₁ mode with the core radius r₁ and Δ

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$Variation curve of effective refractive index with working wavelength in different modes$

Fig. 4. Variation curve of effective refractive index with working wavelength in different modes

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Fig. 5. Variation curve of differential mode delay with wavelength

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Fig. 6. Variation curve of inter-core crosstalk with core pitch

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Fig. 7. Relationship between crosstalk between cores and bending radius at different d. (a) LP₀₁ mode; (b) LP₁₁ mode; (c) LP₂₁ mode

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Fig. 8. Cross-sectional views of 12-core fiber with different core arrangements. (a) ORS; (b) SLS

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Fig. 9. Variation curve of bending loss with cladding thickness

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Table 1. Parameters of heterogeneous core and A_effof each mode

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Table 1. Parameters of heterogeneous core and A_effof each mode

Parameter	Value
Parameter	Core1	Core2
Inner radius /μm	3.1	3.05
External radius /μm	6.3	6.3
Relative refractive indexdifference /%	0.86	0.78
A_eff of LP₀₁ mode /μm²	150.08	150.02
A_eff of LP₁₁ mode /μm²	166.83	170.15
A_eff of LP₂₁ mode /μm²	200.39	212.82

Table 2. Parameters of 12-core fiber in different arrangements
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Table 2. Parameters of 12-core fiber in different arrangements
Core arrangement Core count Core pitch /μm Cladding thickness /μm Cladding diameter /μm
ORS 12 36 50 239.1
SLS 12 36 50 213.8

Table 3. Designed fiber structure parameters and optical performance

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Table 3. Designed fiber structure parameters and optical performance

Parameter	Value(core1/core2)
Inner radius /μm	3.1/3.05
External radius /μm	6.3/6.3
Relative refractive index difference /%	0.86/0.78
Core pitch /μm	36/36
Cladding thickness /μm	50/50
Cladding diameter /μm	213.8/213.8
Effective area of LP₀₁ mode /μm²	150.08/150.02
Effective area of LP₁₁ mode /μm²	166.83/170.15
Effective area of LP₂₁ mode /μm²	200.39/212.82
Inter-core crosstalk X $T_{L P_{01} ⁃ L P_{01}}$ /(dB·km^-1)	-0.4/-0.4
Inter-core crosstalk X $T_{L P_{11} ⁃ L P_{11}}$ /(dB·km^-1)	-0.66/-0.66
Inter-core crosstalk X $T_{L P_{21} ⁃ L P_{21}}$ /(dB·km^-1)	-0.78/-0.78
Differential mode delay DM $D_{L P_{01} ⁃ L P_{11}}$ /(dB·km^-1)	5.66/5.58
Differential mode delay DM $D_{L P_{01} ⁃ L P_{21}}$ /(dB·km^-1)	11.05/9.72
Bending loss at 140 mm /(dB·km^-1)	2.6×10^-5 /5.3×10^-2

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Liu Chang, Pei Li, Xie Yuheng, Wang Jianshuai, Zheng Jingjing, Ning Tigang, Li Jing. Design of Low Crosstalk Few Mode Multi-Core Fiber Based on Heterogeneous Structure[J]. Chinese Journal of Lasers, 2020, 47(11): 1106004

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