1,721,117 research outputs found
2D+1 and 3D Simulation Methods for Hollow Core Fibers Non-Idealities Analysis
No full textWe propose three numerical approaches for the analysis of Hollow Core fibers non-idealities along fiber propagation direction. The first two are 2D+1 approaches and relies on the Coupled Mode Theory and the Mode Matching Method. While the third is a full 3D method since it relies on a 3D finite element method simulation
Transverse Roughness Effect on Fundamental Mode Confinement Loss and Modal Content of Hollow-Core Inhibited Coupling Tube Lattice Fibers
No full textThe effects of the transverse surface roughness on fiber loss and modal content in hollow-core inhibited coupling tube lattice fibers is numerically investigated. Relationship between roughness spectrum and loss of core modes is assessed
Transverse Roughness: Modeling and Effects Analysis on Inhibited Coupling Fibers
No full textA Transverse Roughness theoretical model based on the Azimuthal Fourier Decomposition is proposed to analyse the effects of this perturbation on the Confinement Loss of Hollow-Core Inhibited Coupling Fibers. Scaling laws are also given
Mode Coupling and Ultimate Loss Limit in Hollow Core Fibers
No full textA theoretical model describing the modes coupling in hollow core inhibited coupling fibers is presented. This model gives new insights about the ultimate limits in terms of loss and bandwidth of this kind of fibers
Superradiance from lattice-confined atoms inside hollow core fibre
Full text linkUnravelling superradiance, also known as superfluorescence, relies on an ensemble of phase-matched dipole oscillators and the suppression of inhomogeneous broadening. Here we report a superradiance platform that combines an optical lattice free from the ac Stark shift and a hollow-core photonic crystal fibre, enabling an extended atom-light interaction over 2 mm free from the Doppler effect. This system allows control of the atom spatial distribution and spectral homogeneity whilst efficiently coupling the radiation field to an optical fibre. The experimentally-observed and theoretically-corroborated temporal, spectral and spatial dynamic behaviours of the superradiance, e.g., superradiance ringing and density-dependent frequency shift, demonstrate a unique interplay between the trapped atoms and the fibre-guided field with multiple transverse modes. Our theory indicates that the resulting temporal evolution of the guided light shows a minimal beam radius of 3.1 mu m which is three times smaller than that of the lowest-loss fibre mode
Hybrid inhibited-coupling and photonic bandgap hollow core fiber for telecom wavelength range
No full textWe numerically demonstrate that a hollow-core fiber with a cladding comprised with a first-ring with non-touching tubes surrounded by a photonic bandgap outer-cladding combines low confinement loss, low optical overlap with silica and single modedness
Transverse Roughness Effect on Fundamental Mode Confinement Loss and Modal Content of Hollow-Core Inhibited Coupling Tube Lattice Fibers
No full textThe effects of the transverse surface roughness on fiber loss and modal content in hollow-core inhibited coupling tube lattice fibers is numerically investigated. Relationship between roughness spectrum and loss of core modes is assessed
Mode Coupling Effect on Ideal and Real Hollow-Core Inhibited-Coupling Fibers
No full textConfinement mechanism in Hollow-Core Inhibited-Coupling fibers is based on the inhibition of the caoupling between core modes and cladding modes. In this work we present theoretical and numerical methodologies to estimate the mode coupling effects on fiber loss and single mode propagation
Modeling and Analysis of the Transverse Surface Roughness in Hollow-Core Fibers
No full textThe corrugation of the interfaces of the cross-section of hollow core fibers based on the inhibited coupling waveguiding mechanism is modeled and the impact on propagation loss analyzed. The proposed model is based on a combined use of coupled-mode theory and Azimuthal Fourier Decomposition. It shows that such transverse roughness causes coupling between the core modes and the dielectric modes of the cladding and consequently an increase of the fiber loss. The model is validated by comparing theoretical and numerical results obtained by applying both deterministic and stochastic corrugations to tubular lattice and nested fibers. Scaling laws and impact of the fibers’ parameters are discussed. The model shows that the loss increase is not directly correlated to the root mean square of the stochastic roughness but only to the value of the power spectral density in specific spatial frequency ranges. In particular, the spectral components characterized by a periodicity lower than (Formula presented.) of the tube circumference must have a power spectral density value lower than 0.2 nm2 to ensure a negligible effect of the transverse roughness on fibers with losses lower than 0.1 dB/Km
Azimuthal Fourier decomposition for loss analysis of hollow-core tube lattice fibers part I: Ideal fibers
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