Coherent vortex structures are fascinating physical objects that are widespread in nature:
from large scale atmospheric phenomena, such as tornadoes and the Great Red Spot of …

In this article, we review recent advances in the technology of writing fiber Bragg gratings
(FBGs) in selected cores of multicore fibers (MCFs) by using femtosecond laser pulses. The …

We address the formation of topological states in twisted circular waveguide arrays and find
that twisting leads to important differences of the fundamental properties of new vortex …

Novel fundamental notions hel** in the interpretation of the complex dynamics of
nonlinear systems are essential to our understanding and ability to exploit them. In this work …

We experimentally demonstrate simultaneous spatial and temporal compression in the
propagation of light pulses in multimode nonlinear optical fibers. We reveal that the spatial …

In this paper intermodal modulational instability (IM-MI) is analyzed in a multimode fiber
where several spatial and polarization modes propagate. The coupled nonlinear …

Stable out-of-phase soliton-like distributions of the wave field with few-cycle durations are
found in fibers consisting of a rectangular lattice of weakly coupled cores. The stability of …

We consider vortex solitons in large-scale arrays composed of N elliptical waveguides
placed on a ring, which can be fabricated using fs-laser writing technique in transparent …

High nonlinearity and transparency in the 1–5 μm spectral range make tellurite glass fibers
highly interesting for the development of nonlinear optical devices. For nonlinear optical …

The features of the self-action of a wave field in a small-sized optical system consisting of 2
N identical light guides, which are disposed equidistantly along a ring, and an isolated fiber …