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Self-focusing in multicore fibers

Henrik Tünnermann and Akira Shirakawa

Open Access Open Access

Abstract

Self-focusing is the ultimate power limit of single mode fiber amplifiers. As fiber technology is approaching this limit, ways to mitigate self-focusing are becoming more and more important. Here we show a theoretical analysis of this limitation in coupled multicore fibers. Significant scaling of the self-focusing limit is possible even for coupled multicore fibers if the out-of-phase mode is chosen. On the other hand the in-phase mode can – depending on the coupling strength – be prone to instabilities.

© 2015 Optical Society of America

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Supplementary Material (3)

Media 1: MP4 (143 KB)     
Media 2: MP4 (66 KB)     
Media 3: MP4 (138 KB)     

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Figures (10)
Fig. 1
Fig. 1 Seven core fiber. From left to right: refractive index structure, in-phase mode field and out-of-phase mode field

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Fig. 2
Fig. 2 Six core fiber. From left to right: refractive index structure, in-phase mode field and out-of-phase mode field

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Fig. 3
Fig. 3 Minimum mode area anywhere along 8 cm of propagation for the different modes and fiber designs.

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Fig. 4
Fig. 4 Evolution of the mode area at 5 MW, center position and 4 sigma size for the in-phase mode [ Media 1].

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Fig. 5
Fig. 5 Evolution of the mode area at 5 MW, center position and 4 sigma size for the out-of-phase mode [ Media 2].

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Fig. 6
Fig. 6 Evolution of the mode area at 5 MW, center position and 4 sigma size for out-of-phase mode (95% of power) and in-phase mode (5% of power). The beam stays stable only regular beating is visible [ Media 3].

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Fig. 7
Fig. 7 Minimum mode area anywhere during 8 cm propagation for different core-to-core distances. For comparison the out-of-phase mode is also plotted.

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Fig. 8
Fig. 8 6 core fiber in-phase mode for different core-to-core distance.

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Fig. 9
Fig. 9 Minimum mode area anywhere along 8 cm propagation of two core fibers for different core-to-core distances

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Fig. 10
Fig. 10 Minimum mode size anywhere along 8 cm propagation of two core fibers for different core-to-core distance

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Tables (1)

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Table 1 Effective refractive index difference and beat length between symmetric and antysimmetric mode and expected number of periods in the two core fiber.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

A eff = ( ∫ I d A ) 2 ∫ I 2 d A
L b = 2 π β e − β o = λ n e − n o .
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