Influence of Refractive Index Perturbation on Mode Extinction Ratio in Few-Mode Fibers

Yanqiu Xie; Baojian Wu; Feng Wen

doi:10.3788/AOS202040.2306005

Acta Optica Sinica, Volume. 40, Issue 23, 2306005(2020)

Influence of Refractive Index Perturbation on Mode Extinction Ratio in Few-Mode Fibers

Yanqiu Xie, Baojian Wu^*, and Feng Wen

Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731, China

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Figures & Tables(5)

$Cases with the refractive index perturbation independent of the propagation direction. (a) Core misalignment; (b) structure mismatching$

Fig. 1. Cases with the refractive index perturbation independent of the propagation direction. (a) Core misalignment; (b) structure mismatching

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Fig. 2. Optical power evolution of two modes for the single mode input. (a) γ=0; (b) γ=2

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$Effect of refractive index perturbation on modal extinction ratio$

Fig. 3. Effect of refractive index perturbation on modal extinction ratio

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Fig. 4. Mode extinction ratio of mode combination C_m.n in the multimode fiber at different lengths, in which C_m.n represents the pattern combination of patterns m and n

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Table 1. Parameters of few-mode fiber with the refractive index perturbation
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Table 1. Parameters of few-mode fiber with the refractive index perturbation
Parameter Value
Refractive index of fiber core n₁ 1.4468
Refractive index of cladding n₂ 1.4378
Radius of fiber core r /μm 7
Refractive index perturbation δn²/10^-6 5.06
Wavelength of signal light λ_s /nm 1550

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Yanqiu Xie, Baojian Wu, Feng Wen. Influence of Refractive Index Perturbation on Mode Extinction Ratio in Few-Mode Fibers[J]. Acta Optica Sinica, 2020, 40(23): 2306005

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