@conference{
author = "Beličev, Petra and Gligorić, Goran and Maluckov, Aleksandra and Hadžievski, Ljupčo and Turitsyn, S.",
year = "2021",
abstract = "The multi-core fiber (MCF) is a physical system of high practical importance. In addition to standard exploitation, the MCFs may support discrete vortices that carry orbital angular momentum suitable for spatial-division-multiplexing in high capacity fiber-optic communication systems which may also be attractive for applications in high power lasers. Up to now, the main concern of our study has been related to optimization of the conditions capable to ensure transfer of high coherent light through the MCFs [1]. Regarding this we firstly proved the possibility of nonlinearity managed propagation of highly coherent vortices carrying huge power through the passive circular MCFs, which consist of small number of periphery cores. The central core has been shown to play the role of optional switch/gate of coherent light transfer [1]. In addition, the effects of the presence of central core and material loss/gain of all cores on the linear MCF system eigenvalue commensurability conditions have shown significant impact on the coherent planar and vortex mode dynamics [2]. All these findings stimulated the investigation of possibility to amplify the power transferred through the MCF via vortex carriers by inducing effects of the saturable gain and non-saturable loss in the periphery and/or central cores [3]. We numerically consider three cases of active circular MCFs. In the first case active were only periphery cores. Secondly, we investigated response of the system with only central core active, while the last case included all cores to be active. The light propagation is modeled by the generalized nonlinear difference-differential Schrödinger equations with complex coefficients and saturable gain [3]. Results for MCF with 4, 5 and 6 periphery cores have shown that the active periphery is the most promising candidate for topological charge switch of vortices carrying high powers [4]. In this specific operating regime, MCF provides change of the vortex topological charge value, i.e. transition between different vortex states. Moreover, presented system supports topological charge switch function between noncounterpart vortices by proper tailoring the ratio between gain and loss in periphery. The key condition for this phenomenon is existence of the central core which appears to play role of mode dynamics moderator. Being the ‘singular phase’ point of vortex, the central core which only passively takes part in tunneling energy towards the periphery cores, can support the coherent light amplification through the MCF. On the top of this, presented system shows to be a promising platform for practical realization of devices covering range of multiple functions in applications: from high-power fiber lasers to coherent beam combiners and selective carriers of vortex beams.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Active multi-core fibers – photonic platform for development of a topological charge switching device",
pages = "71",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10901"
}
