A parabolalike fiber end to couple the light from a high-power laser diode into a multimode fiber is presented. The formula for the coupling efficiency of such a system is given, and numerical evaluation shows that the theoretical coupling efficiency can be as high as 92% without an antireflection coating on the fiber’s end face. This beam-shaping system can be fabricated easily and has a large alignment tolerance.

© 2003 Optical Society of America

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Braat, J.

Endo, T.

Mayorov, A. P.

Naqwi, A.

Sevastianov, S. B.

Shiraishi, K.

Vatnik, S. M.

Yoda, H.

Zeng, X.

Zenteno, L. A.

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Figures (4)

Fig. 1
Fig. 1

Schematic of a parabolic fiber end to improve the numerical aperture of a fiber.

Fig. 2
Fig. 2

Astigmatism owing to the existence of the fiber end face.

Fig. 3
Fig. 3

Diagram of the parabolalike fiber end.

Fig. 4
Fig. 4

Diagram of divergence-angle compression.

Equations (5)

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Ix, 0, z=|A|21z2Γ2Γ2+x22,
Iθ, z=|A|2z2Γ12Γ12+tan θ2,
η=-θ1θ1 IθRθTθdθ+2 θ1θ2 IθRθTθdθ-π/2π/2 Iθdθ,