Linear multimode optical systems have enabled clean experimental observations and the
applications of numerous phenomena that continually extend the boundaries of wave …

The aim of this paper is to provide a comprehensive review of mode-division and spatial-
division optical fiber sensors, mainly encompassing interferometers and advanced fiber …

Although the temperature of a thermodynamic system is usually believed to be a positive
quantity, under particular conditions, negative-temperature equilibrium states are also …

Few-mode fibers (FMFs) are promising for advancements in transmission capacity in
classical and quantum communications. However, the inherent modal crosstalk limits the …

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

We develop a spatiotemporal mode decomposition technique to study the spatial and
temporal mode power distribution of ultrashort pulses in long spans of graded-index …

We demonstrate the multiparametric monitoring of directional bending, torsion, and
temperature based on helical long-period gratings (HLPGs) in a triangular four-core fiber …

Classical nonlinear waves exhibit, as a general rule, an irreversible process of
thermalization toward the Rayleigh–Jeans equilibrium distribution. On the other hand …

Characterization of the complex spatiotemporal dynamics of optical beam propagation in
nonlinear multimode fibers requires the development of advanced measurement methods …

Mode purity measurement is crucial for various applications utilizing few-mode fibers and
related devices. In this paper, we propose a simple and accurate method for measuring the …