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Matching of the propagation constants in an asymmetric single-mode fused fiber coupler for core pumping thulium-doped fiber at 795 nm

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  • Matching of the propagation constants in an asymmetric single-mode fused fiber coupler for core pumping thulium-doped fiber at 795 nm
G. Pelegrina-Bonilla, K. Hausmann, K. Liu, H. Sayinc, U. Morgner, J. Neumann, D. Kracht
Matching of the propagation constants in an asymmetric single-mode fused fiber coupler for core pumping thulium-doped fiber at 795 nm
Optics Letters 11 (37), 1844–1846 (2012)
Publication type: Journal Article (reviewed)
DOI: 10.1364/OL.37.001844

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.

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