We present fusing of a fiber micro-knot by a CO laser beam. We demonstrate tuning of the coupling strength and tuning of the spectral resonance of the micro-knot by the fusing process. The experimental results reveal that fusing the fiber micro-knots increases the coupling efficiency and improves the robustness and the stability of the micro-knots.

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http://dx.doi.org/10.1364/AO.55.004538DOI Listing

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