Investigations on single-mode fibers with rectangular core geometry

In this paper, we present a theoretical and experimental analysis on the properties of rectangular core fibers. We investigate the single-mode regime and the bending properties with respect to the aspect ratio of the rectangular core. In comparison to a standard step-index single-mode fiber, we show that a passive single-mode rectangular core fiber with an aspect ratio of 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%. For experimental verification a rectangular core fiber with an aspect ratio of three is manufactured and analysed. Here, the results between the numerical simulation and the experimental analysis are in agreement. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement