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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2002 (1)

1999 (1)

1995 (1)

1994 (1)

1993 (1)

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,