@conference{
author = "Radosavljević, A. and Daničić, A. and Petrović, J. and Maluckov, Aleksandra and Hadžievski, Ljupčo and Rubenchik, A. and Turitsyn, S. K.",
year = "2015",
abstract = "Vortex structures are widespread in nature (tornadoes, the Great Red Spot of Jupiter, and microscopic objects in quantum physics) [1]. Optical vortices are characterized by a wave field with zero intensity, undefined phase in the vortex center, a screw dislocation of the wave front and conservation of the topological charge. The vortex property most significant for applications, such as in optical traps, information transmission, multiplexing in communications and amplification of power in multi-core-fiber (MCF) based lasers, is their ability to carry orbital angular momentum and energy [2]. The mathematical model of the circularly coupled MCF without and with the central core is based on the general complex difference-differential Ginzburg-Landau equation. Here we considered its linear variant with identical small number of periphery cores including loss and gain, as well as, the nonlinear one without the loss-gain mechanisms [2,3]. The most significant finding is the stable propagation of high power vortices in the MCFs. They appeared as eigenvalue solutions of linear MCFs in both the configuration without and with central core [3]. In certain circumstances propagation of 'frozen' vortex structures (the ones that propagate with unchanged phase in cores) is shown, too. The presence of small material losses in cores has not affected stable vortex propagation [3]. In the linear case, the system has no limitations regarding the optical power that is being transmitted, which is not the case in reality, since there are obvious physical restrictions [4]. Although the nonlinearity, in general, shrinks the region of existence of dynamically stable vortices, the huge region of dynamically stable ones with high power is confirmed to prevail [2]. The amplitude of nonlinear vortices is an active parameter, in contrast to the linear system. In conclusion, our results indicate a possibility of stable coherent propagation of high power though MCFs by the means of vortices. A new degree of freedom in the system can be introduced by the presence of the loss-gain mechanisms which can be arranged to 'use' the central core as an energy channel for the energy exchange in the system, therefore allowing destabilization of the vortex structure by localization of a huge power into one core or a small number of cores. The steady-state coherent propagation in MCFs opens new opportunities for the multicore waveguide system applications, such as in spatial division multiplexing. This emerging technology of transmitting information over separate spatial channels – cores in MCF, altogether increasing the total capacity per fiber, is of utmost importance in modern optical communications systems.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade",
title = "On high power dynamically stable vortices in multicore optical fibers",
pages = "71-72",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10955"
}
