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Lenslet array-free efficient coherent combining of broadband pulses at the output of a multicore fiber with a square core grid

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Leuchs,  Gerd
Leuchs Emeritus Group, Emeritus Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Kalinin, N., Anashkina, E. A., Leuchs, G., & Andrianov V, A. (2022). Lenslet array-free efficient coherent combining of broadband pulses at the output of a multicore fiber with a square core grid. OPTICS EXPRESS, 30(2), 1013-1020. doi:10.1364/OE.446794.


Cite as: https://hdl.handle.net/21.11116/0000-000F-8CE1-5
Abstract
An efficient optical scheme for coherent combining of radiation from the output of a multicore fiber (MCF) with a square array of cores in the out-of-phase supermode is proposed. The scheme uses only simple optical elements and is suitable for an arbitrary number of MCF cores. In a proof-of-concept experiment broadband pulses transmitted through a 25-core fiber were combined with 81% efficiency and good beam quality. In numerical modeling a close to unity efficiency is obtained for a large number of cores. The proposed scheme can be used in a reverse direction for efficient beam splitting and launching the out-of-phase supermode into the MCF. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement