Mario Zitelli
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View article: Raman-Accelerated Power Depletion of Fundamental Mode in a Few-Mode Fiber in the Visible Spectral Range
Raman-Accelerated Power Depletion of Fundamental Mode in a Few-Mode Fiber in the Visible Spectral Range Open
We experimentally and numerically investigate Raman-driven power depletion in the fundamental mode of few-mode fibers (FMFs) excited by visible ultrashort pulses. Using a tunable femtosecond laser and SMF-28 fibers operated below the singl…
View article: Modal division multiplexing of quantum and classical signals in few-mode fibers
Modal division multiplexing of quantum and classical signals in few-mode fibers Open
Mode-division multiplexing using multimode optical fibers has been intensively studied in recent years, in order to alleviate the transmission capacity crunch. Moreover, the need for secure information transmission based on quantum encrypt…
View article: A New Thermodynamic Approach to Multimode Fiber Self‐cleaning and Soliton Condensation
A New Thermodynamic Approach to Multimode Fiber Self‐cleaning and Soliton Condensation Open
A new thermodynamic theory for optical multimode systems is proposed. Theory is based on a weighted Bose–Einstein law, and includes the state equation, the fundamental equation for the entropy and a metric to measure the accuracy of the th…
View article: A thermodynamic approach to linear cross-talk in multimode fiber systems
A thermodynamic approach to linear cross-talk in multimode fiber systems Open
Optical thermodynamic theory is extended to low-power multimode fiber systems to characterize with simple thermodynamic models the complex scenario of power exchange induced by random mode coupling between propagating modes. It is theoreti…
View article: Inter-modal Raman amplification in space-division multiplexed systems
Inter-modal Raman amplification in space-division multiplexed systems Open
We theoretically analyze and experimentally demonstrate the possibility of amplifying optical signals in an
\nunrepeatered mode-division multiplexed transmission system, through inter-modal stimulated Raman scattering
\nprocess between sig…
View article: Calorimetry of Photon Gases in Nonlinear Multimode Optical Fibers
Calorimetry of Photon Gases in Nonlinear Multimode Optical Fibers Open
Recent studies have shown that light propagating in a nonlinear, highly multimode system can thermalize in a manner totally analogous to that encountered in traditional statistical mechanics. At thermal equilibrium, the system’s entropy is…
View article: Light tailored by multimode fiber for multiphoton fluorescence microscopy
Light tailored by multimode fiber for multiphoton fluorescence microscopy Open
We study the diffraction of a particular class of beams, composed only by a combination of azimuthally invariant guided modes of an optical fiber. We demonstrate that such beams can be obtained by injecting a Gaussian beam in a small piece…
View article: Optical solitons in multimode fibers: recent advances
Optical solitons in multimode fibers: recent advances Open
Optical solitons in multimode fibers have been predicted 40 years ago and extensively investigated theoretically. Transmission experiments in nonlinear multimode fibers have gained renewed interest, motivated by their potential to extend t…
View article: A New Thermodynamic Approach to Multimode Fibre Self-cleaning and Soliton Condensation
A New Thermodynamic Approach to Multimode Fibre Self-cleaning and Soliton Condensation Open
A new thermodynamic theory for optical multimode systems is proposed. Theory is based on a weighted Bose-Einstein law, and includes the state equation, the fundamental equation for the entropy and a metric to measure the accuracy of the th…
View article: Inter-Modal Raman Amplification in Space-division Multiplexed Systems
Inter-Modal Raman Amplification in Space-division Multiplexed Systems Open
We theoretically analyze and experimentally demonstrate the possibility of amplifying optical signals in an unrepeatered mode-division multiplexed tranmsmission system, through inter-modal stimulated Raman scattering process between signal…
View article: Statistics of modal condensation in nonlinear multimode fibers
Statistics of modal condensation in nonlinear multimode fibers Open
Optical pulses traveling through multimode optical fibers encounter the influence of both linear disturbances and nonlinearity, resulting in a complex and chaotic redistribution of power among different modes. In our research, we explore t…
View article: Spatial Beam Cleaning in Multimode GRIN Fibers: Polarization Effects
Spatial Beam Cleaning in Multimode GRIN Fibers: Polarization Effects Open
International audience
View article: Spatial Division Multiplexing for Multiplex Coherent Anti-Stokes Raman Scattering
Spatial Division Multiplexing for Multiplex Coherent Anti-Stokes Raman Scattering Open
We demonstrate how a narrowband pump and a broadband spectrum can be spatially multiplexed by selective coupling them in two distinct modes of a few-mode microstructure fiber. The first mode carries most of the input pump energy, and exper…
View article: On spatial beam self-cleaning from the perspective of optical wave thermalization in multimode graded-index fibers
On spatial beam self-cleaning from the perspective of optical wave thermalization in multimode graded-index fibers Open
The input power-induced transformation of the transverse intensity profile at the output of graded-index multimode optical fibers from speckles into a bell-shaped beam sitting on a low intensity background is known as spatial beam self-cle…
View article: Time-resolved mode power decomposition for nonlinear multimode fibers
Time-resolved mode power decomposition for nonlinear multimode fibers Open
We experimentally investigate the mode power distribution from long spans of graded-index multimode fiber. We find that, at relatively low powers, linear random mode coupling leads to a Bose-Einstein mode distribution. At powers near the n…
View article: Spatial self-cleaning of laser beams with arbitrary state of polarization of light
Spatial self-cleaning of laser beams with arbitrary state of polarization of light Open
We report on an extensive experimental study of the state of polarization of light during spatial beam self-cleaning in graded-index multimode fibers. Our results show that, depending on the experimental conditions, intense multimode beams…
View article: Statistics of modal condensation in nonlinear multimode fibers
Statistics of modal condensation in nonlinear multimode fibers Open
Optical pulses propagating in multimode optical fibers are affected by linear disorder and nonlinearity, and experience chaotic exchange of power among modes. On the other hand, complex systems can attain steady states characterized by ene…
View article: Experimental Observation of Phase Mode-Locking in Multimode Graded-Index Optical Fiber
Experimental Observation of Phase Mode-Locking in Multimode Graded-Index Optical Fiber Open
The best-known example of phase locking in multimode optical systems is the laser cavity incorporating an ultrafast saturable absorber [1]. Here, the relative phase between the longitudinal cavity modes turns out to be synchronized in orde…
View article: Spatio-Temporal Mode Characterization of Disordered Weakly Nonlinear Graded-Index Multimode Fibers
Spatio-Temporal Mode Characterization of Disordered Weakly Nonlinear Graded-Index Multimode Fibers Open
In the transmission of relatively low power telecom signals, the performance of space-division multiplexed (SDM) transmission systems employing multimode graded-index fiber (GIF) is mostly affected by linear random mode-coupling (RMC) [1],…
View article: Light-by-Light Control Enabled by Incoherent Beam Superpositions in Multimode Fibres
Light-by-Light Control Enabled by Incoherent Beam Superpositions in Multimode Fibres Open
Multimode fibres (MMFs) have recently demonstrated a great potential towards discovering numerous new and complex processes that have never been observed, so far [1]. Among others, Kerr self-cleaning has unveiled the ability of graded-inde…
View article: Pure quartic three-dimensional spatiotemporal Kerr solitons
Pure quartic three-dimensional spatiotemporal Kerr solitons Open
We analyze the formation of three-dimensional spatiotemporal solitons in waveguides with a parabolic refractive index profile and pure quartic chromatic dispersion. We show, by applying both variational approaches and full three-dimensiona…
View article: Light by light manipulation in multimode fibers
Light by light manipulation in multimode fibers Open
International audience
View article: On spatial beam self-cleaning from the perspective of optical wave thermalization in multimode graded-index fibers
On spatial beam self-cleaning from the perspective of optical wave thermalization in multimode graded-index fibers Open
The input power-induced transformation of the transverse intensity profile at the output of graded-index multimode optical fibers from speckles into a bell-shaped beam sitting on a low intensity background is known as spatial beam self-cle…
View article: Spatial beam self-cleaning in multimode fibers: the role of light polarization
Spatial beam self-cleaning in multimode fibers: the role of light polarization Open
Since its first demonstration, spatial beam self-cleaning has been targeted as a breakthrough nonlinear effect,
\nfor its potential of extending to multimode fibers different technologies based on singlemode fibers, such as fiber
\nlasers …
View article: Large band multiphoton microendoscope with single-core standard graded-index multimode fiber based on spatial beam self-cleaning
Large band multiphoton microendoscope with single-core standard graded-index multimode fiber based on spatial beam self-cleaning Open
We demonstrate the feasibility of multiphoton fluorescence imaging with high spatial resolution using commercially available single-core 50/125 multimode graded-index fiber. Light propagating forward inside the endoscopic fiber undergoes a…
View article: Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers
Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers Open
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 multimode fiber, for different input laser conditions. We find that the b…
View article: Multimode Optical Fiber Beam-By-Beam Cleanup
Multimode Optical Fiber Beam-By-Beam Cleanup Open
We introduce and experimentally demonstrate the concept of all-optical beam switching in graded-index multimode optical fibers. Nonlinear coupling between orthogonally polarized seed and signal beams permits to control the spatial beam qua…
View article: Beam-by-beam Kerr clean-up in multimode optical fibres – INVITED
Beam-by-beam Kerr clean-up in multimode optical fibres – INVITED Open
We propose and demonstrate the concept of beam-by-beam cleaning in multimode optical fibres, i.e., the increase of the spatial quality of an intense laser beam, induced by a relatively weak, quasi singlemode seed beam. This effect, which r…
View article: Kerr beam cross-cleaning in multimode fiber
Kerr beam cross-cleaning in multimode fiber Open
We report a cross-cleaning process of a powerful fundamental beam on a weak speckle at the second harmonic. This opens a new way to improving the brightness of weak laser beams in multimode fibers.
View article: An introduction to guided-wave nonlinear ultrafast photonics
An introduction to guided-wave nonlinear ultrafast photonics Open