4.5 Article

Controlled Excitation of Supermodes in a Multicore Fiber with a 5 x 5 Square Array of Strongly Coupled Cores

期刊

PHOTONICS
卷 8, 期 8, 页码 -

出版社

MDPI
DOI: 10.3390/photonics8080314

关键词

multicore fiber; supermode; nonlinear light propagation; spatial light modulator

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资金

  1. Center of Excellence Center of Photonics - Ministry of Science and Higher Education of the Russian Federation [075-15-2020-906]

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The coherent propagation of supermodes in a multicore fiber was studied, with a silica multicore fiber designed and fabricated with a 5 x 5 array of cores. A beam-forming system was developed for controllable excitation of desired supermodes, achieving selective excitation and coherent propagation of broadband radiation.
Coherent propagation of supermodes in a multicore fiber is promising for power scaling of fiber laser systems, eliminating the need for the active feedback system to maintain the phases between the channels. We studied the propagation of broadband pulsed radiation at a central wavelength of 1030 nm in a multicore fiber with coupled cores arranged in a square array. We designed and fabricated a silica multicore fiber with a 5 x 5 array of cores. For controllable excitation of a desired supermode, we developed a beam-forming system based on a spatial light modulator. We experimentally measured intensity and phase distributions of the supermodes, in particular, the in-phase and out-of-phase supermodes, which matched well the numerically calculated profiles. We obtained selective excitation and coherent propagation of broadband radiation with the content of the out-of-phase supermode of up to 90% maintained without active feedback. Using three-dimensional numerical modeling with allowance for a refractive index profile similar to those of the developed fiber, we demonstrated stable propagation of the out-of-phase supermode and collapse of the in-phase supermode at a high signal power.

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