Department of Information Engineering, Electronics and Telecommunications
We analyze the stability and dynamics of dissipative Kerr solitons (DKSs) in the presence of a parabolic potential. This potential stabilizes oscillatory and chaotic regimes, favoring the generation of static DKSs. Furthermore, the potential induces the emergence of new dissipative Read More …
In spite of their ubiquitous applications, the characterization of glass fibers by meansof all-optical techniques is still facing some limitations. Recently, X-ray absorption has beenproposed as a method for visualizing the inner structure of both standard and microstructure opticalfibers. Here, Read More …
We introduce a numerical procedure which permits us to drastically accelerate the design of multimodephotonic crystal resonators. Specifically, we demonstrate that the optical response of an important class of suchnanoscale structures is reproduced accurately by a simple, one-dimensional model within Read More …
Multimode devices and components have attracted considerable attention in the last years, and different research topics and themes have emerged very recently. The multimodality can be seen as an additional degree of freedom in designing devices, thus allowing for the Read More …
Optical solitons in multimode fibers exhibit complex dynamics, and peculiar characteristics in terms of pulse durationand energy, which distinguish them from the single-mode counterpart. We propose a theory for Raman-induced soliton selffrequency shift in multimode fibers, that is compared against Read More …
We report on the thermalization of light carrying orbital angular momentum in multimode optical fibers, induced by nonlinear intermodal interactions. A generalized Rayleigh-Jeans distribution of asymptotic mode composition is obtained, based on the conservation of the angular momentum. We confirm Read More …
In this work, we unveil the unique complex dynamics of multimode soliton interactions in graded-index optical fibers through simulations and experiments. By generating two multimode solitons from the fission of an input femtosecond pulse, we examine the evolution of their Read More …
Since its first demonstration in graded-index multimode fibers, spatial beam self-cleaning has attracted a growing research interest. It allows for the propagation of beams with a bell-shaped spatial profile, thus enabling the use of multimode fibers for several applications, from Read More …
Atoms ionization by the simultaneous absorption of multiple photons has found applications in fiber optics, where it leads to unique nonlinear phenomena. To date, studies of the ionization regime have been limited to gas-filled hollow-core fibers. Here, we investigate multiphoton Read More …
We experimentally and numerically study the ignition of helical-shaped plasma filaments in standard optical fibers. Femtosecond pulses with megawatt peak power with proper off-axis and tilted coupling in the fiber core produce plasma skew rays. These last for distances as Read More …