Inter-core Differential Group Delay Measurement of Seven Core Fiber Based on Spatial Interference Imaging

Licui SHEN; Sujuan HUANG; Wei CHEN; Cheng YAN; Xinpeng ZHAO

doi:10.3788/gzxb20235207.0706002

Acta Photonica Sinica, Volume. 52, Issue 7, 0706002(2023)

Inter-core Differential Group Delay Measurement of Seven Core Fiber Based on Spatial Interference Imaging

Licui SHEN, Sujuan HUANG^*, Wei CHEN, Cheng YAN, and Xinpeng ZHAO

Key Laboratory of Specialty Fiber Optics Access Networks，School of Communication and Information Engineering，Shanghai University，Shanghai 200444，China

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Figures & Tables(11)

$Influence of bending on refractive index of multi-core fiber$

Fig. 1. Influence of bending on refractive index of multi-core fiber

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Fig. 2. Experimental setup for the measure of the DGD in a multi-core fiber

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Fig. 3. Trench-assisted multi-core fiber

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Fig. 4. Excitation diagram and spatial interference diagram of core 0 and core 1

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Fig. 5. Spatial interference spectra of core 0 and core 1

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Fig. 6. Spatial interference spectrum analysis results of cores 0，1

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Fig. 7. Spatial interference spectrum analysis results of cores 0，2 and cores 0，3

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Fig. 8. Spatial interference spectrum analysis results of core 2 and core 3

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Fig. 9. Spatial interference spectrum analysis results of cores 0，2 and 3

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Table 1. Measurement results of the inter-core DGD of 7-core fiber

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Table 1. Measurement results of the inter-core DGD of 7-core fiber

Two cores	Cores	0-1	0-2	0-3	0-4	0-5	0-6
	- $∆ τ / (p s \cdot m^{- 1})$	0.399 4	0.559 2	0.439 4	0.159 8	0.439 4	0.679 0
	Cores	1-2	2-3	3-4	4-5	5-6	6-1
	$∆ τ / (p s \cdot m^{- 1})$	0.159 8	0.119 7	0.279 6	0.279 6	0.239 7	0.279 6
Three cores	Cores	0-1-2	0-2-3	0-3-4	0-4-5	0-5-6	0-6-1
	$Δ τ_{1} / (p s \cdot m^{- 1})$	0.159 8	0.119 7	0.159 8	0.159 8	0.239 6	0.279 6
	$Δ τ_{2} / (p s \cdot m^{- 1})$	0.399 4	0.439 4	0.279 6	0.279 6	0.439 4	0.399 4
	$Δ τ_{3} / (p s \cdot m^{- 1})$	0.559 2	0.559 2	0.439 4	0.439 4	0.679 0	0.679 0

Table 2. Measurement results of bending dependence of the inter-core DGD of 7-core fiber
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Table 2. Measurement results of bending dependence of the inter-core DGD of 7-core fiber
Bending radius Cores
0-1 0-2 0-3 0-4 0-5 0-6
5 mm 0.479 4 0.918 6 1.198 2 0.319 6 0.958 6 1.118 4
75 mm 0.399 4 0.559 2 0.439 4 0.159 8 0.439 4 0.679 0
110 mm 0.239 6 0.319 6 0.199 6 0.079 9 0.279 6 0.239 6

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Licui SHEN, Sujuan HUANG, Wei CHEN, Cheng YAN, Xinpeng ZHAO. Inter-core Differential Group Delay Measurement of Seven Core Fiber Based on Spatial Interference Imaging[J]. Acta Photonica Sinica, 2023, 52(7): 0706002

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