Abstract

We developed a fused fiber coupler (FFC) capable of multiplexing wavelengths in the range of 795 nm and 2 μm. A simple 2D simulation model to calculate the pretaper length for matching the propagation constants in the coupling region was established. Based on the numerical data, we fabricated an asymmetric FFC consisting of two different fibers with single-mode guidance for the respective wavelength, achieving a transmission of 90% in the signal fiber for both wavelengths. In order to demonstrate the application, we integrated the FFC into a core pumped thulium-doped fiber amplifier.

© 2012 Optical Society of America

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References

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1999

1988

1987

1986

R. Black and R. Bourbonnais, IEE Proc. J. 133, 377 (1986).
[CrossRef]

1985

1983

1981

Abebe, M.

Birks, T. A.

Black, R.

R. Black and R. Bourbonnais, IEE Proc. J. 133, 377 (1986).
[CrossRef]

Bourbonnais, R.

R. Black and R. Bourbonnais, IEE Proc. J. 133, 377 (1986).
[CrossRef]

Bures, J.

Burns, W. K.

Chiang, K. S.

Ghatak, A.

A. Ghatak and K. Thyagarajan, Introduction to Fiber Optics (Cambridge University, 1999).

Hill, K. O.

Hussey, C. D.

Jackson, S. D.

Kawasaki, B. S.

King, T. A.

Lacroix, S.

Lamont, R. G.

Lapierre, J.

Thyagarajan, K.

A. Ghatak and K. Thyagarajan, Introduction to Fiber Optics (Cambridge University, 1999).

Villarruel, C. A.

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Figures (5)

Fig. 1.
Fig. 1.

Schematic of the simulation model of an asymmetric coupler. Δz is the hot zone, l is the extension, Df is the diameter of the final taper waist, and Di is the initial diameter of the fiber. The inset shows a lateral cut through the taper waist, illustrating the fusion aspect ratio F of the coupler.

Fig. 2.
Fig. 2.

Calculated effective refractive index neff of the fundamental mode of the pump wavelength in the pump (red dashed curve) and signal (blue dashed curve) fiber at the taper waist. Curve for the pretapered signal fiber (solid black curve) for an estimated pretaper length of 1.8 mm.

Fig. 3.
Fig. 3.

Simulation of the coupling ratio of the pump power to the signal fiber.

Fig. 4.
Fig. 4.

Simulated transmission of the pump and signal power in the signal fiber for a pretaper length of 2.1 mm.

Fig. 5.
Fig. 5.

Experimentally measured transmission of the pump and signal power in the signal fiber during the fabrication process for a pretaper length of 1.8 mm.

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