Search Results - "fiber nonlinear optics"

Full models of scalar modulation instability (MI) in optical fibers available in the literature usually involve complex formulations. In this paper, we present a novel approach to the analysis of MI in optical fibers by means of a simple geometrical description in the power versus frequency plane. T...

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We demonstrate self-similar stable propagation of parabolic optical pulses through a highly nonlinear specialty Bragg fiber at 2.8&#x00A0;<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m by a numerical approach. To obtain such propag...

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Distributed dissipation in optical parametric processes has attracted renewed interests recently due to its rich physics including modulation instability, gain broadening, unidirectional energy transfer etc. Due to difficulties in practical implementation, lumped dissipation are investigated in this...

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We experimentally demonstrate spatial beam self-cleaning in an Yb-doped graded-index multimode fiber taper, both in passive and active configurations. The input laser beam at 1064&#x00A0;nm was injected for propagation from the small to the large core side of the taper, with laser diode pumping...

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Combination of the classical effect of light self-focusing and recently emerged multicore fiber technology offers new opportunities for the spatio-temporal control and manipulation of high-power light radiation. Here, we apply genetic algorithm to design a system enabling self-focusing of light in v...

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A novel highly nonlinear optical fiber with enhanced stimulated Brillouin scattering for narrow-band filtering is proposed. Herein, we initially discuss the tailoring of the Brillouin gain spectrum in germanium and fluorine co-doped single cladding fibers. By adjusting the fiber structure and the do...

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The inter-modal four-wave mixing (IM-FWM) and transversal mode instabilities (TMI) are experimentally studied in high-power distributed side-pumped fiber amplifiers. To the best of our knowledge, we have made the first demonstration of TMI and IM-FWM which can be suppressed simultaneously by increas...

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A CS₂-filled Er-doped fiber, which can provide high nonlinearity and gain, low and flat all-normal dispersion profile, low loss and single-mode operation in the wavelength range of 1500&#x2013;2500 nm, is proposed and analyzed by numerical simulation. When the 1900-nm 0.1-...

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The effect of tens-of-Watt seed light on the stimulated Raman scattering (SRS) in a distributed side-pumped Yb-doped fiber amplifier is studied. By using two sorts of seed sources with the power smaller than 70 W, it is observed in experiment that the SRS can be enhanced by lowering the seed power....

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We numerically found that an intracavity nonlinear absorber (saturable absorber or reversed saturable absorber) plays a crucial role in the formation of dissipative bright or dark solitons in a fiber laser. The operation of an all-normal-dispersion fiber laser could evolve from a bright-soliton emis...

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In this paper, we have constructed an all-fiberized bi-directional pumping fiber amplifier. The output time domain signals and limitations of copumping and counterpumping schemes were experimentally investigated. The power scaling of copumping and counterpumping scheme is restricted by stimulated Ra...

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We present highly efficient time-lenses for orthogonal polarized signal waves with a specific state of polarization. Our four-wave mixing based time-lenses exploit polarization mode dispersion to compensate for chromatic dispersion. The results reveal that the efficiency of the time-lens is increase...

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The properties of the singly resonant and double-pass pump fiber optical parametric oscillators (FOPO) are experimentally investigated. An idler removal filter is utilized to eliminate the idler component in a Fabry&#x2013;P&#x00E9;rot cavity to minimize the effect of modulation instability....

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In this paper, we realize an adjustable biphoton frequency comb and investigate its spatial quantum beating. Vector spontaneous four wave mixing processes in a piece of dispersion shifted fiber are produced by non-degenerate continuous wave pump lights with orthogonal polarizations to generate broad...

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The parametric interaction in few mode fibers is theoretically and numerically studied in the particular case in which the signal and the idler waves are frequency degenerate but mode nondegenerate. Under simplifying hypotheses, we derive analytical formulas for the phase-insensitive and phase-sensi...

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In this paper, we report polarization-locked vector soliton (PLVS) generation in a linear thulium-doped fiber laser. The fiber laser was composed of all-anomalous-dispersion fibers, passively mode-locked with a semiconductor saturable absorber mirror. Approximately 1.2-ps single vector soliton pulse...

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A silica clad optical fiber with a core comprised of SiO₂, P₂O₅, Al₂O₃, and AlPO₄ is analyzed in order to determine the impact of AlPO₄ whe...

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We report the experimental observation of the polarization modulation instability (PMI) effect in all-normal dispersion (ANDi) microstructured optical fibers (MOFs) with quasi-continuous pumping. The small unintentional birefringence (&#x223C;10^&#x2212;5), that any rea...

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