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

Journals >Chinese Journal of Lasers >Volume 47 >Issue 11 >Page 1106004 > Article

Chinese Journal of Lasers
Vol. 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

Author Affiliations

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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DOI: 10.3788/CJL202047.1106004 Cite this Article Set citation alerts

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 Copy Citation Text

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$Refractive index profile of ring core$

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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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 1. Parameters of heterogeneous core and A_effof each mode

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 2. Parameters of 12-core fiber in different arrangements

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

Table 3. Designed fiber structure parameters and optical performance

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