25 February 2008 New mechanism of the mode coupling in multi-core fiber lasers
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Abstract
We present the first experimental demonstration of strong coupling between the core modes in multi-core fibers (MCF) regardless of large spacing (~28μm) between them. The effect is very sensitive to bending of the fiber and is observed in the MCF laser as well as in the probe beam schemes. We explain the observed effect by a mechanism of the mode coupling based on their indirect interaction inside the fiber via intermediate cladding mode, analogues to the Bragg mode. 70% of power conversion from one core to another with beating length of tens of centimeters in 4-core MCF is measured.
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A. S. Kurkov, S. A. Babin, I. A. Lobach, S. I. Kablukov, "New mechanism of the mode coupling in multi-core fiber lasers", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731Q (25 February 2008); doi: 10.1117/12.761521; https://doi.org/10.1117/12.761521
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