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Investigations on single-mode fibers with rectangular core geometry

: Baer, Patrick; Giesberts, Martin; Fitzau, Oliver

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OSA continuum 3 (2020), No.8, pp.2243-2252
ISSN: 2578-7519
Journal Article, Electronic Publication
Fraunhofer ILT ()
fibre laser; rectangular core fibers

In this paper, we present a theoretical and experimental analysis on the propertiesof rectangular core fibers. We investigate the single-mode regime and the bending propertieswith respect to the aspect ratio of the rectangular core. In comparison to a standard step-indexsingle-mode fiber, we show that a passive single-mode rectangular core fiber with an aspect ratioof ten is able to transport two times more power without the occurrence of nonlinear effects.For actively doped fibers, the threshold of nonlinear effects can be raised by up to 15%. Forexperimental verification a rectangular core fiber with an aspect ratio of three is manufacturedand analysed. Here, the results between the numerical simulation and the experimental analysisare in agreement.