A 19-core signal fiber combiner is modeled and simulated for high power coherent beam combination using large-mode-area fiber. Three critical structural parameters of the combiner (cladding/core diameter ratio η, taper ratio γ and taper length L) are analyzed to find the requirements on the fabrication process for preserving beam quality(BQ) of output combined beam. The optimal BQ=1.1 is obtain when η=4, γ=3.5 and L=8cm with the power transmission efficiency above 99%. In addition, a 19-core fiber we fabricated is introduced and tapered following the above value.

© 2017 Optical Society of America

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